Intel® Pentium® III Processor – Low
Power
700 MHz, 500 MHz and 400 MHz Processors in a BGA2 Package
Datasheet
Product Features
■Processor core/bus speeds:
—700/100 MHz
—500/100 MHz
—400/100 MHz
■Supports the Intel Architecture with
Dynamic Execution
■On-die primary 16 -Kby te instr uction cache
and 16-Kbyte write-back data cache
■On-die second level cache (256-Kbyte)
■Integrated GTL+ termination
■Integrated math coprocessor
■Intel Processor Serial Number
■Power Management Features
—Quick Start and Deep Sleep modes
provide low power dissipation
■On-die thermal diode
■Fully compatible wit h previo us Intel
microprocessors
—Binary compatible with all applications
—Support for Intel® MMX™ technology
—Support for Streaming SIMD Extensions
■BGA2 packaging technology
—Supports thin form factor designs
—Exposed die enables more efficient heat
dissipation
Order Number: 273500-003
April 2002
2 Datasheet
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Copyright © Intel Corporation, 2002
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Datasheet 3
Contents
Contents
1.0 Introduction....................................................................................................................................9
1.1 Overview.............................................................................................................................10
1.2 Terminology........................................................................................................................11
1.3 References .........................................................................................................................11
2.0 Pentium® III Processor – Low Power Features.........................................................................12
2.1 Featur es in the Pen tiu m® III Processor – Low Power.........................................................12
2.1.1 On-die GTL+ Termination......................................................................................12
2.1.2 Streaming SIM D Exte ns ion s.................... ...... ....... ...... ....... ...... ....... ...... ....... ..........12
2.2 Power Management............................................................................................................12
2.2.1 Clock Control Architecture.....................................................................................12
2.2.2 Normal State..........................................................................................................12
2.2.3 Auto Halt State.......................................................................................................13
2.2.4 Stop Grant State....................................................................................................14
2.2.5 Quick Start State....................................................................................................14
2.2.6 HALT/Grant Snoop State.......................................................................................14
2.2.7 Sleep State ............................................................................................................15
2.2.8 Deep Sleep State...................................................................................................15
2.2.9 Operating System Implications of Low-power States ............................................16
2.2.10 GTL+ Signa ls........... ...... ....... ...... ....... ............................................. .......................1 6
2.2.11 Pentium® III Processor – Low Power CPUID. ....... ...... ....... ...... ....... ...... .................17
3.0 Electrical Specifications .............................................................................................................17
3.1 Processor System Signals..................................................................................................17
3.1.1 Power Sequencing Requirements .........................................................................19
3.1.2 Test Access Port (TAP) Connection......................................................................19
3.1.3 Catastrophic Thermal Protection ...........................................................................19
3.1.4 Unused Signals......................................................................................................19
3.1.5 Signal State in Low-power States..........................................................................20
3.1.5.1 System Bus Signals...............................................................................20
3.1.5.2 CMOS and Open-drain Sig nals .............................................................2 0
3.1.5.3 Other Signals .........................................................................................20
3.2 Power Supply Requirements ..............................................................................................21
3.2.1 Decoupli ng Recomm end ati ons...................... ....... ...... .......................... .................21
3.2.2 Voltage Planes.......................................................................................................21
3.3 System Bus Clock and Processor Clocking........................................................................22
3.4 Maximum Ratings...............................................................................................................22
3.5 DC Specifications ...............................................................................................................23
3.6 AC Specifica tio ns..... ...... ....... ...... ....... ............................................. .......................... ..... .....26
3.6.1 System Bus, Clock, APIC, TAP, CMOS, and Open-drain AC Specifications ........26
4.0 System Signal Simulations.........................................................................................................35
4.1 System Bus Clock (BCLK) and PICCLK AC Signal Quality Specifications ........................35
4.2 GTL+ AC Signal Quality Specifications ..............................................................................36
4.3 Non-GTL+ Signal Quality Specifications.............................................................................39
4.3.1 PWRGOOD Signal Quality Specifications.............................................................39
Contents
4 Datasheet
5.0 Mechanical Specifications..........................................................................................................40
5.1 Surface-mount BGA2 Package Dimensions.......................................................................40
5.2 Signal Listings.....................................................................................................................42
6.0 Thermal Specifications ...............................................................................................................50
6.1 Thermal Diode....................................................................................................................51
7.0 Processor Initialization and Configuration ...............................................................................52
7.1 Description..........................................................................................................................52
7.1.1 Quick Start Enable.................................................................................................52
7.1.2 System Bus Frequency..........................................................................................52
7.1.3 APIC Enable..........................................................................................................52
7.2 Clock Frequencies and Ratios............................................................................................52
8.0 Proce ssor In terf ace.....................................................................................................................53
8.1 Alphabetical Signal Reference............................................................................................53
8.1.1 A[35:3]# (I/ O - GTL+)........ ....... ...... ....... ......................... ........................................53
8.1.2 A20M# (I - 1.5 V Tolerant).....................................................................................53
8.1.3 ADS# (I/O - GTL+).................................................................................................53
8.1.4 AERR# (I/O - GTL+) ..............................................................................................53
8.1.5 AP[1:0]# (I/O - GTL+) ............................................................................................53
8.1.6 BCLK (I - 2.5 V Tolerant).......................................................................................54
8.1.7 BERR# (I/O - GTL+) ..............................................................................................54
8.1.8 BINIT# (I/O - GTL+)...............................................................................................54
8.1.9 BNR# (I/O - GTL+).................................................................................................54
8.1.10 BP[3:2]# (I/O - GTL+) ............................................................................................55
8.1.11 BPM[1:0]# (I/O - GTL+) .........................................................................................55
8.1.12 BPRI# (I - GTL+)....................................................................................................55
8.1.13 BREQ0# (I/O - GTL+)............................................................................................55
8.1.14 BSEL[1:0] (I – 3.3 V Tolerant)................................................................................55
8.1.15 CLKREF (Analog)..................................................................................................55
8.1.16 CMOSREF (Analog)..............................................................................................56
8.1.17 D[63:0]# (I/O - GTL+).............................................................................................56
8.1.18 DBSY# (I/O - GTL+) ..............................................................................................56
8.1.19 DEFER# (I - GTL+)................................................................................................56
8.1.20 DEP[7:0]# (I/O - GTL+)..........................................................................................56
8.1.21 DRDY# (I/O - GTL+)... .......................... ......................... .......................... ..............56
8.1.22 EDGCTRLP (Analog).............................................................................................56
8.1.23 FERR# (O - 1.5 V Tolerant Open-drain)................................................................57
8.1.24 FLUSH# (I - 1.5 V Tolerant)...................................................................................57
8.1.25 GHI# (I - 1.5 V Tolerant)........................................................................................57
8.1.26 HIT# (I/O - GTL+), HITM# (I/O - GTL+).................................................................57
8.1.27 IERR# (O - 1.5 V Tolerant Open-drain).................................................................57
8.1.28 IGNNE# (I - 1.5 V Tolerant) ...................................................................................57
8.1.29 INIT# (I - 1.5 V Tolerant)........................................................................................58
8.1.30 INTR (I - 1.5 V Tolerant)........................................................................................58
8.1.31 LINT[1:0] (I - 1.5 V Tolerant)..................................................................................58
8.1.32 LOCK# (I/O - GTL+) ..............................................................................................58
8.1.33 NMI (I - 1.5 V Tolerant)..........................................................................................58
8.1.34 PICCLK (I - 2.5 V Tolerant)....................................................................................59
Datasheet 5
Contents
8.1.35 PICD[1:0] (I/O - 1.5 V Tolerant Open-drain) ..........................................................59
8.1.36 PLL1, PLL2 (Anal og) ..... ....... ...... ....... ............................................. .......................5 9
8.1.37 PRDY# (O - GTL+) ................................................................................................59
8.1.38 PREQ# (I - 1.5 V Tolerant) ....................................................................................59
8.1.39 PWRGOOD (I - 2.5 V Tolerant) .............................................................................59
8.1.40 REQ[4:0]# (I/O - GTL+)..........................................................................................60
8.1.41 RESET# (I - GTL+)................................................................................................60
8.1.42 RP# (I/O - GTL+) ...................................................................................................60
8.1.43 RS[2:0]# (I - GTL+)................................................................................................61
8.1.44 RSP# (I - GTL+)....... ...... ....... ...... ....... ...... ...... ....... .......................... ...... .................61
8.1.45 RSVD (TBD) ..........................................................................................................61
8.1.46 RTTIMPEDP (Analog) ...........................................................................................61
8.1.47 SLP# (I - 1.5 V Tolerant)........................................................................................61
8.1.48 SMI# (I - 1.5 V Tolerant) ........................................................................................61
8.1.49 STPCLK# (I - 1.5 V Tolerant).................................................................................61
8.1.50 TCK (I - 1.5 V Tolerant) .........................................................................................62
8.1.51 TDI (I - 1.5 V Tolerant)...........................................................................................62
8.1.52 TDO (O - 1.5 V Tolerant Open-drain) ....................................................................62
8.1.53 TESTHI (I - 1.5 V Tolerant)....................................................................................62
8.1.54 TESTLO[2:1] (I - 1.5 V Tolerant)............................................................................62
8.1.55 THERMDA, THERMDC (Analog)...........................................................................62
8.1.56 TMS (I - 1.5 V Tolerant).........................................................................................62
8.1.57 TRDY# (I - GTL+) ..................................................................................................62
8.1.58 TRST# (I - 1.5 V Tolerant) .....................................................................................63
8.1.59 VID[4:0] (O – Open-drain)......................................................................................63
8.1.60 VREF (Analog).......................................................................................................63
8.2 Signal Summaries...............................................................................................................63
9.0 PLL RLC Filter Specification ......................................................................................................66
9.1 Introduction.........................................................................................................................66
9.2 Filter Specification ..............................................................................................................66
9.3 Recommendation for Low Power Systems.........................................................................67
9.4 Comments ..........................................................................................................................68
Contents
6 Datasheet
Figures
1 Signal Groups of a Pentium® III Processor/440BX AGPset - Based System...............................9
2 Signal Groups of a Pentium® III Processor/440MX Chipset - Based System ............................10
3 Clock Control States...................................................................................................................13
4 Vcc Ramp Rate Requirement.....................................................................................................19
5 PLL RLC Filter............................................................................................................................21
6 PICCLK/TCK Clock Timing Waveform .......................................................................................30
7 BCLK Timing Waveform.............................................................................................................31
8 Valid Delay Timings....................................................................................................................31
9 Setup and Hold Timings .............................................................................................................31
10 Cold/Warm Reset and Configuration Timings ............................................................................32
11 Power-on Reset Timings ............................................................................................................32
12 Test Timings (Boundary Scan)...................................................................................................33
13 Test Reset Timings.....................................................................................................................33
14 Quick Start/Deep Sleep Timing ..................................................................................................34
15 Stop Grant/Sleep/Deep Sleep Timing ........................................................................................34
16 BCLK/PICCLK Generic Clock Waveform...................................................................................36
17 Low to High, GTL+ Receiver Ringback Tolerance .....................................................................37
18 High to Low, GTL+ Receiver Ringback Tolerance .....................................................................37
19 Maximum Acceptable Overshoot/Undershoot Waveform...........................................................38
20 Surface-mount BGA2 Package - Top and Side View.................................................................41
21 Surface-mount BGA2 Package - Bottom View...........................................................................42
22 Pin/Ball Map - Top View .............................................................................................................43
23 PWRGOOD Relationship at Power On ......................................................................................60
24 PLL Filter Specifications.............................................................................................................67
Datasheet 7
Contents
Tables
1 Clock State Characteristics.........................................................................................................16
2Pentium
® III Processor – Low Power CPUID .............................................................................17
3Pentium
® III Processor – Low Power CPUID Cache and TLB Des criptor s ............... ....... ...... ....1 7
4 System Signal Groups................................................................................................................17
5 Recommended Resistors for Pentium III Processor – Low Power Signals................................18
6Pentium
® III Processor – Low Power Absolute Maximum Ratings.............................................22
7 Power Specifications ..................................................................................................................23
8 GTL+ Signal Group DC Specifications.......................................................................................24
9 GTL+ Bus DC Specifications......................................................................................................24
10 Clock, APIC, TAP, CMOS, and Open-drain Signal Group DC Specifications ............................25
11 System Bus Clock AC Specifications .........................................................................................26
12 Supported Processor Frequencies.............................................................................................26
13 GTL+ Signal Groups AC Specifications......................................................................................27
14 CMOS and Open-drain Signal Groups AC Specifications..........................................................27
15 Reset Configuration AC Specifications.......................................................................................28
16 APIC Bus Signal AC Specifications............................................................................................28
17 TAP Signal AC Specifications.....................................................................................................29
18 Quick Start/Deep Sleep AC Specifications.................................................................................30
19 Stop Grant/Sleep/Deep Sleep AC Specifications.......................................................................30
20 BCLK Signal Quality Specification..............................................................................................35
21 PICCLK Signal Quality Specifications ........................................................................................35
22 GTL+ Signal Group Ringback Specification ...............................................................................36
23 GTL+ Signal Group Overshoot/Undershoot Tolerance at the Processor Core ..........................38
24 Non-GTL+ Signal Group Overshoot/Undershoot Tolerance at the Processor Core...................39
25 Surface-mount BGA2 Package Specifications ...........................................................................40
26 Signal Listing in Order by Pin/Ball Number.................................................................................44
27 Signal Listing in Order by Signal Name......................................................................................47
28 Voltage and No-Connect Pin/Ball Locations...............................................................................49
29 Power Specifications for the Pentium III Processor – Low Power..............................................50
30 Thermal Diode Interface.............................................................................................................51
31 Thermal Diode Specifications.....................................................................................................51
32 BSEL[1:0] Encoding....................................................................................................................55
33 Voltage Identification Encoding ..................................................................................................63
34 Input Signals...............................................................................................................................64
35 Output Signals.... .......................... ............................................. .......................... .......................65
36 Input/Output Signals (Single Driver)...........................................................................................65
37 Input/Output Signals (Multiple Driver).........................................................................................65
38 PLL Filter Inductor Recommendations .......................................................................................67
39 PLL Filter Capacitor Recommendations.....................................................................................68
40 PLL Filter Resistor Recommendations.......................................................................................68
Contents
8 Datasheet
Revision History
Date Revision Description
April, 2002 003 Updated introduction
June, 2001 002 Pins AD20, AA17, H4 and G4 changed to be NC.
March, 2001 001 First release of this document.
Intel® Pentium® III Processor – Low Power
Datasheet 9
1.0 Introduction
The Intel® Pen ti um® III Processor – Low Power offers high performance and low power
consumption. Key performance advancements include Internet Streaming SIMD instructions, an
advanced transfer cache architecture, and a processor system bus speed of 100 MHz. These
features are offered in a BGA2 package.
The integrated L2 cache improves performance, and complements the system bus by providing
critical data faster and reducing total system power consumption. The processor’s 64-bit wide
Gunning Transceiver Logic (GTL+) system bus provides a glueless, point-to-point interface for an
I/O bridge/memory controller, and is compatible with the 440BX and 440ZX-M AGPset Chipsets,
and the 440MX Chipset.
This document provides the electrical, mech anical and thermal specifications f or the 700 MHz, 500
MHz and 400 MHz Pentium III Processor – Low Power. Please note that the 700 MHz Intel®
Pentium® III processor – Low Power (product number KC80526GY850256) is the same silicon as
the Mobile Intel® Pentium® III processor at 850/700 MHz with Intel® SpeedS tep™ tech nology an d
is labeled as such. When Intel SpeedStep technology is not implemented, the processor defaults to
700 MHz operation at 1.35 V. EID does not support Intel SpeedStep.
Figure 1 shows the components of a Pentium III processor/440BX or 440ZX-M AGPset -based
system and how th e Pentiu m III Processor – Low Power connects to them. Figure 2 shows an
alternative Pentium III Processor – Low Power/440MX Chipset - based system.
Figure 1. Signal Groups of a Pentium® III Processor/440BX AGPset - Based System
Pentium® III
Processor –
Low Power
443BX
OR
440ZX-M
North Bridge
PIIX4E
South Bridge
PCI
IOAPIC
(optional)
ISA/EIO
TAP
APIC
Bus
CMOS/
Open Drain
DRAM
System
Bus
Thermal
Sensor
SMBus
System
Controller
V0000-03
OR
Intel® Pentium® III Processor – Low Power
10 Datasheet
1.1 Overview
•Performance features
—Supports the Intel Architecture with Dynamic Execution
—Supports Intel MMX™ technology
—Supports streaming SIMD extensions for enhanced video, sound, and 3D performance
—Integrated Intel Floating Point Unit compatible with the IEEE 754 standar d
•On-die primary (L1) instruction and data caches
—4-way set associative, 32-byte line size, 1 line per sector
—16-Kbyte instruction cache and 16-Kbyte write-back data cache
—Cacheable range controlled by processor programmable registers
Figure 2. Signal Groups of a Pentium® III Processor/440MX Chipset - Based System
Pentium® III
Processor –
Low Power
440MX
PCIset
PCIX-bus
TAP
CMOS/
Open Drain
DRAM
System
Bus
Thermal
Sensor
SMBus
System
Controller V0000-04
OR
Intel® Pentium® III Processor – Low Power
Datasheet 11
•On-die second level (L2) cache
—8-way set associative, 32-byte line size, 1 line per sector
—Operates at full core speed
—256-Kbyte, ECC protected cache data array
•GTL+ system bus interface
—64-bit data bus, 100-MHz operation
—Uniprocessor, two loads only (processor and I/O bridge/memory controller)
—Integrated termination
•Processor clock control
—Quick Start for low power, low exit laten cy clock “throttling”
—Deep Sleep mode for lower power dissipation
•Thermal diode for measuring processor temperature
1.2 Terminology
In this document a “#” symbol foll owing a signal name indicates that the signal is active low. This
means that when the signal is asserted (based on the name of the signal) it is in an electrical low
state. Otherwise, signals are driven in an electrical high state when they are asserted. In state
machine diagrams, a signal name in a condit ion indicates the condition of that signal being
asserted. If the signal name is preceded by a “!” symbol, then it indicates the condition of that
signal not being asserted. For example, the condition “!STPCLK# and HS” is equivalent to “the
active low signal STPCLK# is unasserted (i.e., it is at 1.5 V) and the HS condition is true.” The
symbols “L” and “H” refer respectively to electrical low and electrical high signal levels. The
symbols “0” and “1” refer respectively to logical low and logical high signal levels. For example,
BD[3:0] = “1010” = “HLHL” refers to a hexadecimal “A,” and D[3:0]# = “1010” = “LHLH” also
refers to a hexadecimal “A.” The symbol “X” refers to a “Don’t Care” condition, where a “0” or a
“1” results in the same behavior.
1.3 References
CK97 Clock Driver Specification (Contact your Intel Field Sales Representative)
Intel® Architecture Software Developer ’s Manual (Order Number 243193)
Volume I: Basic Architecture (Order Number 243190)
Volume II: Instruction Set Reference (Order Number 243191)
Volume III: System Programming Guide (Order Number 243192)
Mobile Pentium® III Processor I/O Buffer Models, IBIS Format (Available in electronic form;
Contact your Intel Field Sales Representative)
Mobile Pentium® III Pr ocessor GTL+ System Bus Layout Guideline (Contact your Intel Field Sales
Representative)
Intel® Pentium® III Processor – Low Power
12 Datasheet
2.0 Pentium® III Processor – Low Power Features
2.1 Features in the Pentium® III Processor – Low Power
2.1.1 On-die GTL+ Termination
The termination resistors for the GTL+ system bus are integrated onto the processor die. The
RESET# sign al does n ot hav e on -di e t erm in atio n an d r equi res an ext ern al 56.2 Ω ± 1 % terminating
resistor.
2.1.2 Streaming SIMD Extensions
The Pentium III Processor – Low Power implements Streaming SIMD (single instruction, multiple
data) extensions. Streaming SIMD extensions can enhance floating point, video, sound, and 3-D
application perfo rman ce.
2.2 Power Managem ent
2.2.1 Clock Cont rol Arc hit ec ture
The Pentium III Processor – Low Power clock control architecture (Figure 3) has been optimized
for leading edge low power designs. The clock control architecture consists of seven different
clock states: Normal, Stop Grant, Auto Halt, Quick Start, HALT/Grant Snoop, Sleep, and Deep
Sleep states. The Auto Halt state provides a low-power clock state that can be controlled through
the software execution of the HLT instruction. The Quick Start state provides a very low power and
low exit latency clock state that can be used for hardware controlled “idle” computer states. The
Deep Sleep state provides an extremely low-power state that can be used for “Power-On-Suspend”
computer states, whi ch is an alternative to shutting off the processor’s power. C ompared to the
Pentium processor exit latency of 1 ms, the exit latency of the Deep Sleep state has been reduced to
30 µs in the Pentium III Processor – Low Power. Performing state transitions not shown in Figure 3
is ne ither recommende d nor supported.
The Stop Grant and Quick Start clock states are mutually exclusive, i.e., a strapping option on
signal A15# chooses which s tate is entered when the STPCLK# sign al is asserted . The Quick S t art
state is enab led by st rapping t he A15# sig nal to gro und at Reset ; otherwi se, assert ing the STP CLK#
signal puts the processor into the Stop Grant state. The Stop Grant state has a higher power level
than the Quick Start state and is designed for Symmetric Multi-Processing (SMP) platforms. The
Quick Start state has a much lower power level, but it can only be used in uniprocessor platforms.
Table 1 provides clock state characteristics, which are described in detail in the following sections.
2.2.2 Normal State
The Normal state of the processor is the normal operating mode where the processor’s core clock is
running and the processor is actively executing instructions.
Intel® Pentium® III Processor – Low Power
Datasheet 13
2.2.3 Auto Halt State
This is a low-power mode entered by the processor through the execution of the HLT instruction.
The power level of this mode is similar to the Stop Grant stat e. A transition to the Normal state is
made by a hal t break event (one of the fo llowing sign als going active: NMI, INTR, B INIT#, INIT#,
RESET#, FLUSH#, or SMI#).
Asserting the STPCLK# signal while in the Auto Halt state will cause the processor to transition to
the Stop Grant or Quick Start state, where a Stop Grant Acknowledge bus cycle will be issued.
Deasserting STPCLK# will cause the processor to return to the Auto Halt state without issuing a
new Halt bus cycle.
The SMI# interrupt is recognized in the Auto Halt state. The return from the System Management
Interrupt (SMI) handler can be to either the Normal state or the Auto Halt state. See the Intel®
Architecture Software Developer’s Manual, Volume III: System Programmer’s Gu i d e for more
information. No Halt b us cycle is issued when returning to the Auto Halt state fr om the System
Management Mode (SMM).
The FLUSH# signal is serviced in the Auto Halt state. After the on-chip and off-chip caches have
been flushed, the processor will return to the Auto Halt state without issuing a Halt bus cycle.
Tr ansitions in the A20M# and PREQ# signals are recognized while in the Auto Halt state.
Figure 3. Clock Control States
NOTES:
halt break – A20M#, BINIT#, FLUSH#, INIT # , IN TR, NMI, PREQ#, RESET#, SM I#
HLT – HLT instruction executed
HS – Processor Halt State
QSE – Quick Start State Enabled
SGA – Stop Grant Acknowledge bus cycle issued
stop break – BI N I T#, R ESE T #
HALT/Grant
Snoop
Normal
HS=false
Stop
Grant
Auto
Halt
HS=true
Quick
Start
Sleep
Deep
Sleep
(!STPCLK#
and !HS) or
stop break
STPCLK# and
!QSE and SGA
Snoop
occurs
Snoop
serviced
STPCLK# and
QSE and SGA
(!STPCLK# and !HS)
or RESET#
Snoop
serviced Snoop
occurs
!STPCLK#
and HS
STPCLK# and
!QSE and SGA
HLT and
halt bus cycle
halt
break
Snoop
serviced
Snoop
occurs
STPCLK# and
QSE and SGA
!STPCLK#
and HS
!SLP# or
RESET#
SLP#
BCLK
stopped
BCLK on
and !QSE
BCLK
stopped
BCLK on
and QSE
V0001-00
Intel® Pentium® III Processor – Low Power
14 Datasheet
2.2.4 Stop Grant State
The processor enters this mode with the assertion of the STPCLK# signal when it is configured for
Stop Grant state (via the A15# strapping option) . The process or is still able to respond to snoop
requests and latch interrupts. Latched interrupts will be serviced when the pr oces sor returns to the
Normal state. Only one occurrence of each interrupt event will be latched. A transition back to the
Normal state can be made by the deassertion of the STPCLK# signal or the occurrence of a stop
break event (a BINIT# or RESET# assertion).
The processor will return to the S top Grant state after the completion of a BINIT# bus initialization
unless STPCLK# has been de-asser ted. RESE T# asser tion will caus e the pr oces sor to immed iately
initialize itself, but the processor will stay in the Stop Grant state after initialization until STPCLK#
is deasserted. A transition to the Sleep state can be made by the assertion of the SLP# signal.
While in the Stop Grant state, assertions of FLUSH#, SMI#, INIT#, INTR, and NMI (or
LINT[1:0]) will be latched by the pro cesso r. These latched events will not be servi ced unti l the
processor returns to the Normal state. Only one of each ev ent will be recognized upon return to the
Normal state.
2.2.5 Quick Start State
This is a mode entered by the proces sor with the assertion of the STPCLK# sig nal when it is
configured for the Quick Start state (via the A15# strapping option). In the Quick Start state the
processor is only capable of acting on snoop transactions generated by the system bus priority
device. Because of its snooping behavior, Quick Start can only be used in a uniprocessor (UP)
configuration.
A transition to the Deep Sleep state can be made by stopping the clock input to the processor. A
transition back to the Normal state (from the Quick S tart state) is made only if the STPCLK# signal
is deasserted.
While in this state the pro cessor is limited in its ability to res pon d to input. It is incapable of
latching any interrupts, servicing snoop transactions from symmetric bus masters or responding to
FLUSH# or BINI T# assertions. While the processor is in the Quick Start state, it will not respond
properly to any input signal other than STPCLK#, RESET#, or BPRI#. If any other input signal
changes, then the behavior of the processor will be unpredictable. No serial interrupt messages may
begin or be in progress while the processor is in the Quick Start state.
RESET# assertion will cause the processor to immediately initialize itself, but the processor will
stay in the Quick Start state after initialization until STPCLK# is deasserted.
2.2.6 HALT/Grant Snoop Stat e
The processor will resp ond to snoop transactions on the system bus while in the Auto Halt, Stop
Grant, or Quick Start state. When a snoop transaction is presented on the system bus the processor
will enter the HALT/Grant Sn oop state. The processor will remain in this state unti l the s noop has
been serviced and the sy stem bus is quiet. After the snoop has been serviced, the processor will
return to its previous state. If the HALT/Grant Snoop state is entered from the Quick Start state,
then the input signal restrictions of the Quick Start state still apply in the HALT/Grant Snoop state,
except for those signal transitions that are required to perform the snoop.
Intel® Pentium® III Processor – Low Power
Datasheet 15
2.2.7 Sleep State
The Sleep state is a very low-power state in which the processor maintains its context and the
phase-locked loop (PLL) maintains phase lock. The Sleep state can only be entered from the Stop
Grant state. After entering the Stop Grant state, the SLP# signal can be asserted, causing the
processor to enter the Sleep state. The SLP# signal is not recognized in the Normal or Auto Halt
states.
The processor can be reset by the RESET# signal while in the Sleep state. If RESET# is driven
active while the processor is in the Sleep state then SLP# and STPCLK# must immediately be
driven inactive to ensu re that the processor correctly initializes itself.
Input signals (other than RESET#) may not change while the processor is in the Sleep state or
transitionin g into or out o f the Sleep state. Input signal changes at these times will cause
unpredictable behavior. Thus, the processor is incapable of snooping or latching any events in the
Sleep state.
While in the Sleep state, the processor can enter its lowest power state, the Deep Sleep state.
Removing the processor’s input clock puts the processor in the Deep Sleep state. PICCLK may be
removed in the Sleep state.
2.2.8 Deep Sle ep Stat e
The Deep Sleep state is the lowest power mode the processor can enter while maintaining its
context. The Deep Sleep state is entered by stopping the BCLK inpu t to the processor, while it is in
the Sleep or Qui ck Start state. For proper opera tio n, the BCLK input s hou ld be s t op ped i n the Low
state.
The processor will return to the Sleep or Qu ick Start state from the Deep Sleep state when the
BCLK input is restarted. Due to the PLL lock latency, there is a delay of up to 30 µs after the clocks
have started before this state trans ition happens . PICCLK may be removed in the Deep Sleep state.
PICCLK should be designed to turn on when BCLK turns on when transitioning out of the Deep
Sleep state.
The input signal restrictions for the Deep Sleep state are the same as for the Sleep state, except that
RESET# assertion will result in unpredictable behavior.
Intel® Pentium® III Processor – Low Power
16 Datasheet
2.2.9 Operating System Implications of Low-power States
There are a number of architectural features of the Pentium III Processor – Low Power that do not
function in the Quick Start or Sleep state as they do in the Stop Gran t state. The time-stamp counter
and the performance monitor counters are not guaranteed to count in the Quick Start or Sleep
states. The local APIC timer and p erformance monitor counter in terrupts sho uld be disabled b efore
entering the Deep Sleep state or the resulting behavior will be unpredictable.
2.2.10 GTL+ Signals
The Pentium III Processor – Low Power system bus signals use a variation of the low-voltage
swing GTL signaling techno logy. The Pentium III Processor – Low Power system bus specification
is similar to the Pentium II processor system bus specification, which is a version of GTL with
enhanced noise margins and less ringing.
The GTL+ system bus depends on incident wave switching and uses flight time for timing
calculations of the GTL+ signals, as op posed to capacitiv e derating. Analog signal simulation of
the system bus including trace lengths is highly recommended. Contact your field sales
representative to receive the IBIS models for the Pentium III Processor – Low Power.
The GTL+ system bus of the Pentium II processor was designed to support high-speed data
transfers with multiple loads on a long bus that behaves like a transmission line. However, in most
embedded systems the system bus only has two loads (the processor and the chipset) and the bus
traces are short. It is possible to change the layout and termination of the system bus to take
advantage of the embedded environment using the same GTL+ I/O buffers. In embedded systems
the GTL+ system bus is terminated at one end only. This termination is provided on the processor
core (except for the RESET# signal). Refer to the Mobile Pentium® III Pr oces sor GTL+ System Bus
Layout Guideline for details on laying out the GTL+ system bu s.
Table 1. Clock State Characteristics
Clock State Exit Latency Snooping? System Uses
Normal N/A Yes Normal program execution
Auto Halt Approximately 10 bus clocks Yes S/W controlled entry idle mode
Stop Grant 10 bus clocks Yes H/W controlled entry/exit throttling
Quick Start
Through snoop, to HAL T/Grant
Snoop state: immediate
Through STPCLK#, to Normal
state: 8 bus clocks Yes H/W controlled entry/exit throttling
HALT/Grant
Snoop A few bus clocks after the end
of snoop activity Yes Supports snooping in the low power states
Sleep To Stop Grant state 10 bus
clocks No H/W controlled entry/exit desktop idle mode
support
Deep Sleep 30 µsNo H/W controlled entry/exit powered-on
suspend support
NOTE: See Table 29 for power dissipation in the low-power states.
Intel® Pentium® III Processor – Low Power
Datasheet 17
2.2.11 Pentium® III Processor – Low Power CPUID
The CPUID instructio n does not distinguish between the Pentium III processor and the Pentium III
Processor – Low Power. After a power-on RESET or when the CPUID version information is
loaded, the EAX register contains the values shown in
Tab le 2 . After the L2 cache is initialized , the CPUID cache/TLB descriptors will be the values
shown in Table 3.
3.0 Electrical Specifications
3.1 Processor System Signals
Table 4 lists the processor system signals by type. All GTL+ signals are synchronous with the
BCLK signal. All TAP signals are synchronous with the TCK signal except TRST#. All CMOS
input signals can be applied asynchronously.
Table 2. Pentium® III Processor – Low Power CPUID
EAX[31:0] EBX[7:0]
Reserve d [31:14] Type [13:12] Family [11:8] Model [7:4] Stepping [3:0] Brand ID
X068X02
Table 3. Pentium® III Processor – Low Power CPUID Cache and TLB Descriptors
Cache and TLB Descriptors 01H, 02H, 03H, 04H, 08H, 0CH, 82H
Table 4. System Signal Groups (Sheet 1 of 2)
Group Name Signals
GTL+ Input BPRI#, DEFER#, RESET#, RS[2:0]#, RSP#, TRDY#
GTL+ Output PRDY#
GTL+ I/O A[3 5 :3 ] # , AD S#, AERR # , AP [1 : 0 ] # , BERR#, BI N IT # , BN R # , BP[3:2]# ,
BPM[1:0]#, BREQ0#, D[63:0]#, DBSY#, DEP[7:0]#, DRDY#, HIT#, HITM#,
LOCK#, REQ[4:0]#, RP#
1.5 V CMOS Input 2A20M#, FLUSH#, IGNNE#, INIT#, LINT0/INTR, LINT1/NMI, PREQ#, SLP#,
SMI#, STPCLK#
2.5 V CMOS Input 1, 3 PWRGOOD
1.5 V Open Drain Output 2FERR#, IERR#
3.3 V CMOS Input4BSEL[1:0]
NOTES:
1. See Section 8.1.39 for information on the PWRGOOD signal.
2. T hes e signals are tolerant to 1.5 V only. See Table 5 for the recommended pull-up resistor.
3. T hes e signals are tolerant to 2.5 V only. See Table 5 for the recommended pull-up resistor.
4. T hes e signals are tolerant to 3.3 V only. See Table 5 for the recommended pull-up resistor.
5. VCC is the power supply for the core logic. PLL1 and PLL2 are the power supply for the PLL analog
section. VCCT is the power supply for the system bus buffers. VREF is the voltage reference for the GTL+
input buffers. VSS is system ground.
Intel® Pentium® III Processor – Low Power
18 Datasheet
The CMOS, APIC, and TAP inputs can be driven from ground to 1.5 V. BCLK, PICCLK, and
PWRGOOD can be driven from ground to 2.5 V. The APIC data and TAP o utputs are Open-drain
and should be pulled up to 1.5 V using resistors with the values shown in Table 5. If Open-drain
drivers are used for input signals, then they should also be pulled up to the appropriate voltage
using resistors with the values shown in Table 5.
Clock 3BCLK
APIC Clock 3PICCLK
APIC I/O 2PICD[1:0]
Thermal Diode THERMDA, THE RMDC
TAP Input 2TCK, TDI, TMS, TRST #
TAP Output 2TDO
Power/Other 5CLKREF, CMOSREF, EDGECTRLP, NC, PLL1, PLL2, RSVD, R TTIMPEDP,
TESTHI , T EST LO[2:1], VCC, VCCT, VID[4:0], VREF, VSS
Table 4. System Signal Groups (Sheet 2 of 2)
Group Name Signals
NOTES:
1. See Section 8.1.39 for information on the PWRGOOD signal.
2. These signals are tolerant to 1.5 V only. See Table 5 for the recommended pull-up resistor.
3. These signals are tolerant to 2.5 V only. See Table 5 for the recommended pull-up resistor.
4. These signals are tolerant to 3.3 V only. See Table 5 for the recommended pull-up resistor.
5. VCC is the power supply for the core logic. PLL1 and PLL2 are the power supply for the PLL analog
section. VCCT is the power supply for the system bus buffers. VREF is the voltage reference for the GTL+
input buffers. VSS is syste m ground.
Table 5. Recommended Resistors for Pentium III Processor – Low Power Signals
Recommended
Resistor Value (Ω)Pentium III Processor – Low Power Si gna l 1, 2
10 pull-down BREQ0#3
56.2 pull-up RESET#4
150 pull-up PICD[1:0], TDI, TDO
270 pull-up SMI#
680 pull-up STPCLK#
1K pull-up INIT#, TCK, TMS
1K pull-down TRST#
1.5K pull-up A20M#, FERR#, FLUSH#, IERR#, IGNNE#, LINT0/INTR, LINT1/
NMI, PREQ#, PWRGOOD, SLP#
NOTES:
1. The recommendations above are only for signals that are being used. These recommendations are
maximum values only; stronger pull-ups may be used. Pull-ups for the signals driven by the chipset should
not violate the chipset specification. Refer to Section 3.1.4 for the required pull-up or pull-down resistors
for signals that are not being used.
2. Open-drain signals must never violate the undershoot specification in Section 4.3. Use stronger pull-ups if
there is too much undershoot.
3. A pull-down on BREQ0# is an alternative to having the central agent to drive BREQ0# low at reset.
4. A 56.2Ω 1% terminat ing resistor connected to VCCT is required.
Intel® Pentium® III Processor – Low Power
Datasheet 19
3.1.1 Power Sequencing Requirements
The Pentium III Processor – Low Pow er has no power s equenci ng requiremen ts. Int el recommends
that all of the processor power planes rise to their specified values within one second of each other.
The VCC power plane must not rise too fast. At least 200 µs (TR) must pass from the time that VCC
is at 10% of its nominal value until the time that VCC is at 90% of i t s no mi nal valu e (s ee F i gur e 4) .
3.1.2 Test Access Port (TA P) Connection
The TAP interface is an implementation of the IEE E 1 149. 1 (“JTAG”) standard. Due to the voltage
levels supported by the TAP interface, Intel recommends that the Pentium III Processor – Low
Power and the other 1.5-V JTAG specification compliant devices be last in the JTAG chain after
any devices with 3. 3-V o r 5.0-V J TAG interfaces within the system. A tran slation b uffer should be
used to reduc e the TDO output vo ltage of th e last 3.3/5.0 V device d own to the 1.5 V rang e that the
Pentium III Processor – Low Power can tolerate. Multiple copies of TMS and TRST# must be
provided, one for each voltage level.
A Debug Port and connector may be placed at the start and end of the JTAG chain containing the
processor, with TDI to the first component coming from the Debug Port and TDO from the last
component going to the Debug Port. There are no requirements for placing the Pentium III
Processor – Low Power in the JTAG chain, except for those that are dictated by voltage
requirements of the TAP signals.
3.1.3 Catastrophic Thermal Protection
The Pentium III Processor – Low Power does not support catastrophic thermal protection or the
THERMTRIP# signal. An external thermal sensor must be used to protect the processor and the
system against excessive temperatures.
3.1.4 Unused Signals
All signal s named NC and RSVD must be unconnected. The TESTHI sig nal should be pulled up to
VCCT. The TESTLO1 and TESTLO2 signal should be pulled down to VSS. Unused GTL+ inputs,
outputs and bidirectional signals should be unconnected. Unused CMOS active low inputs should
be connected to VCCT and unused active high inputs should be connected to VSS. Unused Open-
drain outputs should be unconnected. If the processor is configured to enter the Quick Start state
Figure 4. Vcc Ramp Rate Requirement
Vcc
Volts
90% Vcc (nominal)
10% Vcc (nominal) TR
Time
Intel® Pentium® III Processor – Low Power
20 Datasheet
rather than the Stop Grant state, then the SLP# signal should be connected to VCCT. When tying
any signal to power or ground, a resistor will allow for system testability. For unused signals, Intel
suggests that 1.5-kΩ resistors are used for pull-ups and 1-kΩ resistors are used for pull-downs.
If the local APIC is hardware disab led, then PICCLK and PICD[1: 0] sh ould be ti ed to VSS with a
1-kΩ resistor, one resistor can be used for the three signals. Otherwise PICCLK must be driven
with a clock that meets specification (see Table 16) and the PICD[1:0] signals must be pulled up to
VCCT with 150-Ω resistors, even if the local APIC is not used.
BSEL1 must be connected to VSS and BSEL0 must be pulled up to VCCT. VID[4:0] should be
connected to VSS if they are not used.
If the TAP signals are not used then the inputs should be pul led to gro und with 1-kΩ resistors and
TDO should be left unconnected.
3.1.5 Signal State in Low-power States
3.1.5.1 System Bus Signals
All of the system bus sign als have GTL+ input, output, or input/output drivers. Except when
servicing snoops , the system bu s signals are th ree-stated and pulled up by the termination resi stors.
Snoops are not permitted in the Sleep and Deep Sleep states.
3.1.5.2 CMOS and Open-drain Signals
The CMOS input signals are allowed to be in either the logic high or low state when the processor
is in a low-power state. In the Auto Halt and Stop Grant states these signals are allowed to toggle.
These input buf fers have n o internal pull-up o r pull-down resist ors and system lo gic can use CMOS
or Open-drain drivers to drive them.
The Open-drain output signals have open drain drivers and external pull-up resistors are required.
One of the two output signals (IERR#) is a catastrophic error indicator and is three-stated (and
pulled-up) when the processor is functioning normally. The FERR# output can be either three-
stated or driven to VSS when the processor is in a low-power state depending on the condition of
the floating point unit. Since this signal is a DC current path when it is driven to VSS, Intel
recommends that the s oftware clears or masks any floating-point error cond ition b efor e pu tting the
processor into the Deep Sleep state.
3.1.5.3 Other Signals
The system bus clock (B CLK) must be driven in all o f the low-p ower st ates except the Deep Sleep
state. The APIC clock (PICCLK) must be driven whenever BCLK is driven unless the APIC is
hardware disabled or th e processor is in the Sleep state. Otherwise, it is permitted to turn off
PICCLK by hold ing it at VSS. The sy stem bus clock shou ld be hel d at VSS when it is stopped in the
Deep Sleep state.
In the Auto Halt and Stop Grant states the APIC bus data signals (PICD[1:0]) may toggle due to
APIC bus messages . These signals are r equired to be three-st ated and pulled-up when the processor
is in the Quick Start, Sleep, or Deep Sleep states unless the APIC is hardware disabled.
Intel® Pentium® III Processor – Low Power
Datasheet 21
3.2 Power Supply Requirements
3.2.1 Decoupling Reco mmendations
The amount of bulk decoupling required on the VCC and VCCT planes to meet the voltage tolerance
requirements for the Pentium III Processor – Low Power are a strong function of the power supply
design. Contact your Intel Field Sales Representative fo r tools to help determine how much bulk
decoupling is required.
For 700 MHz processors, the following decoupling is recommended. The processor core power
plane (VCC) should have fifteen 0.68 µF 0603 ceramic capacitors (usi ng X7R dielectric for thermal
reasons) placed directly under the package using two vias for power and two vias for ground to
reduce the trace inductanc e. Also to minimize inductance, traces to thos e vias should be 22 mils ( in
width) from the capacitor pads to match the via-pad size (assuming 22-mil pad size). Twenty-four
2.2 µF 0805, X5R mid fr equency d ecoupling cap acitors should be placed aro und the d ie as close to
the die as flex solution allows. The system bus buffer power plane (VCCT) should have twenty 0.1-
µF high frequency decoupling capacitors around the die.
For 500 and 400 MHz processors, the processor core power plan (VCC) should have eight 0.1-µF
high frequency decoupling capacitors placed underneath the die and twenty 0.1-µF mid frequency
decoupling capacitors placed around the die as close to the die as flex solution allows. The system
bus buffer power plane (VCCT) should have twenty 0.1-µF high frequency decoupling capacitors
around the die.
3.2.2 Voltage Planes
All VCC and VSS pins/balls must b e conn ected to the appropriate voltage plane. All VCCT and
VREF pins/balls must be connected to the appropriate traces on the system electronics. In addition
to the main VCC, VCCT, and VSS power suppl y sign als, PLL1 and PL L2 provid e analog decoupl ing
to the PLL section. PLL1 and PLL2 should be connected according to Figure 5. Do not connect
PLL2 directly to VSS. Section 9.0 contains the RLC filter specification.
Figure 5. PLL RLC Filter
PLL1
PLL2
VCCT
V0027-01
L1
C1
R1
Intel® Pentium® III Processor – Low Power
22 Datasheet
3.3 System Bus Clock and Processor Clocking
The 2.5-V BCLK clock input directly controls the operating speed of the system bus interface. All
system bus timing parameters are specified with respect to the rising edge of the BCLK input. The
Pentium III Processor – Low Power core frequency is a multiple of the BCLK frequency. The
processor co re frequency is conf igured duri ng manufacturi ng. The configured bus ratio is vis ible to
software in the Power-on configuration register, see Section 7.2 for details.
Multiplying the bus clock frequency is necessa ry to increase performance while allowing for easier
distribution of signals within the system . Clo c k multiplication within the processo r is provided by
the internal Phase Lock Loop (PLL), which requires a constant frequency BCLK input. During
Reset or on exit from the Deep Sleep state, the PLL requires some amount of time to acquire the
phase of BCLK. This time is called the PLL lock latency, which is specified in Section 3.6, AC
timing paramet ers T1 8 and T4 7.
3.4 Maximum Ratings
Table 6 contains the Pentium III Processor – Low Power stress ratings. Functional operation at the
absolute maximum and minimum is neither implied nor guaranteed. The processor should not
receive a clock while subjected to these conditions. Functional operating conditions are provided in
the AC and DC tables. Extended exposure to the maximum ratings may affect device reliability.
Furthermore, although the processor contains protective circuitry to resist damage from static
electric discharge, one should always take precautions to avoid high static voltages or electric
fields.
Table 6. Pentium® III Processor – Low Power Absolute Maximum Ratings
Symbol Parameter Min Max Unit Notes
TStorage Storage Temperature –40 85 °CNote1
VCC(Abs) Supply Voltage with respect to VSS –0.5 2.1 V
VCCT System Bus Buffer Voltage with respect to VSS –0.3 2.1 V
VIN GTL System Bus Buffer DC Input Voltage with respect to VSS –0.3 2.1 V Notes 2, 3
VIN GTL System Bus Buffer DC Input Voltage with respect to VCCT —VCCT +
0.7 V V Notes 2, 4
VIN15 1.5 V Buffer DC Input Volt age with respect to VSS –0.3 2.1 V Note 5
VIN25 2.5 V Buffer DC Input Volt age with respect to VSS –0.3 3.3 V Note 6
VIN33 3.3 V Buffer DC Input Volt age with respect to VSS –0.3 3.5 V Note 7
VINVID VID ball/pin DC Input Volt age with respect to VSS —5.5 V
IVID VID Current 5 mA Note 8
NOTES:
1. The shipping container is only rated for 65°C.
2. Parameter applies to the GTL+ signal groups only. Compliance with both VIN GTL specifications is required.
3. The voltage on the GTL+ signals must never be below –0.3 or above 2.1 V with respect to ground.
4. The volt age on the GTL+ signals must never be above VCCT + 0.7 V even if it is less than VSS + 2.1 V, or a
short to ground may occur .
5. Parameter applies to CMOS, Open-drain, APIC, and TA P bus signal groups only.
6. Parameter applies to BCLK, CLKREF, PICCLK and PWRGOOD signals.
7. Parameter applies to BSEL[1:0] signals.
8. Parameter applies to each VID pin/ball individually.
Intel® Pentium® III Processor – Low Power
Datasheet 23
3.5 DC Specifications
Tab le 7 through Table 10 lists th e DC specifications for the Pentium III Processor – Low Power.
Specifications are valid only while meeting specifications for the junction temperature, clock
frequency, and input voltages. Care should be taken to read all notes associated with each
parameter.
The signals on the P enti um III Processor – Low Power system b us are included in the GTL+ signal
group. These signals are specified to be term inated to VCC. The DC specifications for these signals
are listed in Table 8 and the termination and reference voltage specifications for these signals are
listed in Table 9. The Pentium III Processor – Low Power requires external termination and a
VREF. Refer to the Mobile Pentium III Processor GTL+ System Bu s Layout Guide line for full
details of system VCCT and VREF requirements. The CMOS, Open-drain, and TAP signals are
designed to interface at 1.5 V levels to allow connection to other devices. BCLK and PICCLK are
designed to receive a 2.5-V clock sign al. The DC specifications for these signals are listed in Table
10.
Table 7. Power Specifications
TJ = 0°C to 100°C; 1.35 V ±100 mV; VCCT = 1.50 V ±115 mV
Symbol Parameter Min Typ Max Unit Notes1
VCC Transient VCC for core logic 1.25 1.35 1.4 5 V ±100 mV
Notes 7, 8
VCC,DC Static VCC for core logi c 1.25 1.35 1 .4 5 V ±100 mV
Note 2, 8
VCCT VCC for System Bus Buffers, Transient
tolerance 1.385 1.50 1.615 V ±115 mV,
Note 7, 8
VCCT,DC VCC for System Bus Buffers, S tatic
tolerance 1.455 1.50 1.545 V ±3%, Notes 2, 8
ICC
Current for VCC at core frequency
at 700 MHz & 1.35 V
at 500 MHz & 1.35 V
at 400 MHz & 1.35 V
12.8
9.5
7.8
A
A
ANote 4
ICCT Current for VCCT 2.5 A Notes 3, 4
ICC,SG Processor Stop Grant and Auto Halt
current
at 1.35 V (for 700 MHz) 2.7 ANote 4
ICC,QS Processor Quick Start and Sleep current
at 1.35 V (for 700 MHz) 2.4 ANote 4
ICC,DSLP Processor Deep Sleep Leakage current
at 1.35 V (for 700 MHz) 2.1 A Note 4
dICC/dt VCC power supply current slew rate 1400 A/µsNotes 5, 6
NOTES:
1. Unless otherwise noted, all specifications in this table apply to all processor frequencies.
2. Static voltage regulation includes: DC output initial voltage set point adjust, output ripple and noise, output
load ranges specified in this table, temperature, and warm up.
3. ICCT is the current supply for the system bus buffers, including the on-die termination.
4. ICCx,max specifications are specified at VCC, DC max, VCCT,max, and 100°C and under maximum signal
loading conditions.
5. Based on simulations and averaged over the duration of any change in current. Use to compute the
maximum inductance and reaction time of the voltage regulator. This parameter is not tested.
6. Maximum values specified by design/characterization at nominal VCC and VCCT.
7. VCCx must be within this range under all operating conditions, including maximum current transients.
VCCx must return to within the static voltage specification, VCCx,DC, within 100 µs after a transient event.
8. Voltages are measured at the package ball.
Intel® Pentium® III Processor – Low Power
24 Datasheet
Table 8. GTL+ Signal Group DC Specifications
TJ = 0°C to 100°C; VCC = 1.35 V ±100 mV; VCCT = 1.50 V ±115 mV
Symbol Parameter Min Max Unit Notes
VOH Output High Voltage —— V See VCCT,max in Table 9
RON Output Low Drive Strength 16.67 Ω
ILLeakage Current for Inputs, Outputs and I/Os ±100 µA(0 ≤ VIN/OUT ≤ VCCT)
Table 9. GTL+ Bus DC Specifications
TJ = 0°C to 100°C; VCC = 1.35 V ±100 mV; VCCT = 1.50 V ±115 mV
Symbol Parameter Min Typ Max Unit Notes
VCCT Bus Termination Voltage 1.385 1.5 1.615 V Note 1
VREF Input Reference Voltage 2/3 VCCT – 2% 2/3 VCCT 2/3 VCCT + 2% V ±2%, Note 2
RTT Bus Termination Strength 50 56 65 ΩOn-die RTT,
Note 3
NOTES:
1. For simulation use 1.50 V ±10%. For typical simulation conditions use VCCTmin (1.5 V –10%).
2. VREF should be created from VCCT by a voltage divider.
3. The RESET# signal does not have an on-die RTT. It requires an off-die 56.2 Ω ±1% terminat ing resistor
connected to VCCT.
Intel® Pentium® III Processor – Low Power
Datasheet 25
Table 10. Clock, APIC, TAP, CMOS, and Open-drain Signal Grou p DC Specifications
TJ = 0° C to 100° C; VCC = 1.35 V ± 100 mV; VCCT = 1.50 V ± 115 mV
Symbol Parameter Min Max Unit Notes
VIL15 Input Low Voltage, 1.5 V CMOS –0.15 VCMOSREFmin
– 200 mV V
VIL25 Input Low Voltage, 2.5 V CMOS –0.3 0.7 V Notes 1, 2
VIL33 Input Low Voltage, 3.3 V CMOS –0.3 VCMOSREFmin
– 200 mV VNote7
VIL,BCLK Input Low Voltage, BCLK –0.3 0.5 V Note 2
VIH15 Input High Voltage, 1.5 V CMOS VCMOSREFmax
+ 200 mV VCCT V
VIH25 Input High Voltage, 2.5 V CMOS 2.0 2.625 V N otes 1, 2
VIH33 Input High Voltage, 3.3 V CMOS VCMOSREFmax
+ 200 mV 3.465 V Note 7
VIH,BCLK Input High Voltage, BCLK 2.0 2.625 V Note 2
VOL Outp ut Low Vol ta g e 0.4 V N o te 3
VOH15 Output High Voltage, 1.5 V CMOS N/A 1.615 V All outputs are
Open-drain
VOH25 Output High Voltage, 2.5 V CMOS N/A 2.625 V All outputs are
Open-drain
VOH,VID Output High Voltage, VID ball/pins N/A 5.50 V 5V + 10%
VCMOSREF CMOSREF Vo ltage 0.90 1.10 V Note 4
VCLKREF CLKREF Voltage 1.175 1.325 V 1.25V ±6%, Note 4
IOL Output Low Current 10 mA Note 6
ILLeakage Current for Input s,
Outputs and I/Os ±100 µANotes 5, 8
NOTES:
1. P aram eter applies to the PICCLK and PWRGOOD signals only.
2. VILx,min and VIHx,max only apply when BCLK and PICCLK are stopped. BCLK and PICCLK should be
stopped in the low state. See Table 20 for the BCLK voltage range specifications for when BCLK is running.
See Table 21 for the PICCLK volt age range specifications for when PICCLK is running.
3. Parameter measured at 10 mA.
4. VCMOSREF and VCLKREF should be created from a stable voltage supply using a voltage divider.
5. (0 ≤ VIN/OUT ≤ VIHx,max).
6. Specified as the minimum amount of current that the output buffer must be able to sink. However, VOL,max
cannot be guaranteed if this specification is exceeded.
7. Parameter applies to BSEL[1:0] signals only.
8. For BSEL[1:0] signals, IL, Max can be up to 100 µA (with 1 KΩ pull-up to 1.5 V), and can be up to 500 µA
(with 1 KΩ pull-up to 3.3 V)
Intel® Pentium® III Processor – Low Power
26 Datasheet
3.6 AC Specifications
3.6.1 System Bus, Clock, APIC, TAP, CMOS, and Open-drain AC
Specifications
Table 11 through Table 19 provide AC specifications associated with the Pentium III Processor –
Low Power. The AC specifications are divided into the following categories: Table 11 contains the
system bus clock specifications; Table 12 contains the processor core frequencies; Table 13
contains the GTL+ specifications; Table 14 contains the CMOS and Open-drain signal groups
specifications; Table 15 contains timings for the reset conditions; Table 16 contains the APIC
specifications; Table 17 contains the TAP specifications; and Table 18 and Table 19 contain the
power management timing specifications.
All system bus AC specifications for the GTL+ signal group are relative to the rising edge of the
BCLK input at 1.25 V. All GTL+ timings are referenced to VREF for both “0” and “1” logic levels
unless otherwise specified. All APIC, TAP, CMOS, and Open-drain signals except PWRGOOD are
referenced to 0.75 V.
Table 11. System Bus Clock AC Specifications
TJ = 0° C to 100° C; VCC = 1.35 V ±100 mV; VCCT = 1.50 V ±115 mV
Symbol Parameter Min Typ Max Unit Figure Notes1
System Bus Frequency 100 MHz
T1 BCLK Period 10 ns Figure 7 Note 2
T2 BCLK Period Stability ±250 ps Figure 7 Notes 3, 4
T3 BCLK High Time 2.70 ns Figure 7 at >2.0 V
T4 BCLK Low Time 2.45 ns Figure 7 at <0.5 V
T5 BCLK Rise Time 0.175 0.875 ns Figure 7 (0.9 V – 1.6 V)
T6 BCLK Fall Time 0.175 0.875 ns Figure 7 (1.6 V – 0.9 V)
NOTES:
1. All AC timings for GTL+ and CMOS signals are referenced to the BCLK rising edge at 1.25 V. All CMOS
signals are referenced at 0.75 V.
2. The BCLK period allows a +0.5 ns tolerance for clock driver variation.
3. Not 100% tested. Specified by design/characterization.
4. Measured on the rising edge of adjacent BCLKs at 1.25 V. The jitter present must be accounted for as a
component of BCLK skew between devices.
Table 12. Supported Processor Frequencies
TJ = 0° C to 100° C; VCC = 1.35 V ±100 mV; VCCT = 1.50 V ±115 mV
BCLK Frequency
(MHz) Frequency Multipli e r Core Frequency
(MHz) Power-on Conf iguratio n
bits [27, 25:22]
100 4 400 0, 0010
100 5 500 0, 0000
100 7 700 0, 1001
NOTE: While other combinations of bus and core frequencies are defined, operation at frequencies other
than those listed above will not be validated by Intel and are not guaranteed. The frequency
multiplier is programmed into the processor when it is manufactured and it cannot be changed.
Intel® Pentium® III Processor – Low Power
Datasheet 27
Table 13. GTL+ Signal Groups AC Specifications
RTT = 56 Ω internally terminated to VCCT; VREF = 2/3 VCCT; load = 0 pF;
TJ = 0° C to 100° C; VCC = 1.35 V ± 100 mV; VCCT = 1.50 V ± 115 mV
Symbol Parameter1Min Max Unit Figure Notes
T7 GTL+ Output Valid Delay 0.2 2.7 ns Figure 8
T8 GTL+ Input Setup Time 1.2 ns Figure 9 Notes 2, 3
T9 GTL+ Input Hold Time 0.80 ns Figure 9 Notes 4
T10 RESET# Pulse Width 1 ms Figure 10
Figure 11 Note 5
NOTES:
1. All AC timings for GTL+ signals are referenced to the BCLK rising edge at 1.25 V. All GTL+ signals are
referenced at VREF.
2. RESET# can be asserted (active) asynchronous ly, but must be de-asserted sync hronous ly.
3. Specification is for a minimum 0.40 V swing.
4. Specification is for a maximum 1.0 V swing.
5. Afte r VCC, VCCT, and BCLK become stable and PWRGOOD is asserted.
Table 14. CMOS and Open-drain Signal Groups AC Specifications
TJ = 0° C to 100° C; VCC = 1.35 V ± 100 mV; VCCT = 1.50 V ± 115 mV
Symbol Parameter1, 2 Min Max Unit Figure Notes
T14 1.5 V Input Pulse Width, except
PWRGOOD and LINT[1:0] 2 BCLKs Figure 8 Active and
Inactive states
T14B LINT[1:0] Input Pulse Width 6 BCLKs Figure 8 Note 3
T15 PWRGOOD Inactive Pulse Width 10 BCLKs Figure 11 Notes 4, 5
NOTES:
1. All AC timings for CMOS and Open-drain signals are referenced to the BCLK rising edge at 1.25 V. All
CMOS and Open-drain signals are referenced at 0.75 V.
2. Minimum output pulse width on CMOS outputs is 2 BCLKs .
3. This specification only applies when the APIC is enabled and the LI NT1 or LINT0 signal is confi gured as an
edge triggered interrupt with fixed delivery, otherwise specification T14 applies.
4. When driven inactive, or after VCC, VCCT and BCLK becom e stable. PWRGOOD must remain below
VIL25,max from Table 10 until all the voltage planes meet the voltage tolerance specifications in Table 7 and
BCLK has met the BCLK AC specifications in Table 11 for at least 10 clock cycles. PWRGOOD mu st rise
glitch-free and monotonically to 2.5 V.
5. If the BCLK Settling Time specification (T60) can be guaranteed at power-on reset then the PWRGOOD
Inactive Pulse Width specification (T15) is waived and BCLK may start after PWRGOOD is asserted.
PWRGOOD must still remain below VIL25,max until all the voltage planes meet the voltage tolerance
specifications.
Intel® Pentium® III Processor – Low Power
28 Datasheet
Table 15. Reset Configuration AC Specifications
TJ = 0° C to 100° C; VCC = 1.35 V ±100 mV; VCCT = 1.50 V ±115 mV
Symbol Parameter Min Max Unit Figure Notes
T16 Reset Configuration Signals (A[15:5]#,
BREQ0#, FLUSH#, INIT#, PICD0) Setup
Time 4BCLKs
Figure 8
Figure 9
Before
deassertion of
RESET#
T17 Reset Configuration Signals (A[15:5]#,
BREQ0#, FLUSH#, INIT#, PICD0) Hold Time 220BCLKs
Figure 8
Figure 9
After clock
that deasserts
RESET#
T18 RESET #/PW RG OOD Setup Time 1 ms Figure 11 Before
deassertion of
RESET#1
NOTE:
1. At least 1 ms must pass after PWRGOOD rises above VIH25,min from Table 10 and BCLK meets its AC
timing specification until RESET# may be deasserted.
Table 16. APIC Bus Signal AC Specifications
TJ = 0° C to 100° C; VCC = 1.35 V ±100 mV; VCCT = 1.50 V ±115 mV
Symbol Parameter1Min Max Unit Figure Notes
T21 PICCLK Frequency 2 33.3 MHz Note 2
T22 PICCLK Pe riod 30 500 ns Figure 6
T23 PICCLK High Time 10.5 ns Figure 6 at >1. 7 V
T24 PICCLK Low Time 10.5 ns Figure 6 at <0.7 V
T25 PICCLK Rise Time 0.25 3.0 ns Figure 6 (0.7 V – 1.7 V)
T26 PICCLK Fall Time 0.25 3.0 ns Figure 6 (1.7 V – 0.7 V)
T27 PICD[1:0] Setup Time 5.0 ns Figure 9 Note 3
T28 PICD[1:0] Hold Time 2.5 ns Figure 9 Note 3
T29 PICD[1:0] Valid Delay (Rising Edge)
PICD[1:0] Valid Delay (Falling Edge) 1.5
1.5 8.7
12.0 ns
ns Figure 8 Not es 3, 4, 5
NOTES:
1. All AC timings for APIC signals are referenced to the PICCLK rising edge at 1.25 V. All CMOS signals are
referenced at 0.75 V.
2. The minimum frequency is 2 MHz when PICD0 is at 1.5 V at reset. If PICD0 is strapped to VSS at reset then
the minimum frequency is 0 MHz.
3. Refe renced to PICCLK Rising Edge.
4. For Open-drain signals, Valid Delay is synonymous with Float Delay.
5. Valid delay timings for these signals are specified into 150Ω to 1.5 V and 0 pF of external load. For real
system timings these specifications must be derated for external capacitance at 105 ps/pF.
Intel® Pentium® III Processor – Low Power
Datasheet 29
Table 17. TAP Signal AC Specifications
TJ = 0° C to 100° C; VCC = 1.35 V ± 100 mV; VCCT = 1.50 V ± 115 mV
Symbol Parameter1Min Max Unit Figure Notes
T30 TCK Frequency —16.67 MHz
T31 TCK Period 60 —ns Figure 6
T32 TCK High Time 25.0 ns Figure 6 ≥ 1.2 V, Note 2
T33 TCK Low Time 25.0 ns Figure 6 ≤ 0.6 V, Note 2
T34 TCK Rise Time 5.0 ns Figure 6 (0.6 V – 1.2 V),
Notes 2, 3
T35 TCK Fall Time 5.0 ns Figure 6 (1.2 V – 1.6 V),
Notes 2, 3
T36 TRST# Pulse Width 40.0 ns Figure 13 Asynch ronous,
Note 2
T37 TDI, TMS Setup Time 5.0 ns Figure 12 Note 4
T38 TDI, TMS Hold Time 14.0 ns Figure 12 Note 4
T39 TDO Valid Delay 1.0 10.0 ns Figure 12 Notes 5, 6
T40 TDO Float Delay 25.0 ns Figure 12 Notes 2, 5, 6
T41 All Non-Test Outputs Valid Delay 2.0 25.0 ns Figure 12 Notes 5, 7, 8
T42 All Non-Test Outputs Float Delay 25.0 ns Figure 12 Notes 2, 5, 7, 8
T43 All Non-Test Inputs Setup Time 5.0 ns Figure 12 Notes 4, 7, 8
T44 All Non-Test Inputs Hold Time 13.0 ns Figure 12 Notes 4, 7, 8
NOTES:
1. All AC timings for TAP signals are referenced to the TCK rising edge at 0.75 V. All TAP and CMOS signals
are referenced at 0.75 V.
2. Not 100% tested. Specified by design/characterization.
3. 1 ns can be added to the maximum TCK rise and fall times for every 1 MHz below 16 MHz.
4. Referenced to TCK rising edge.
5. Referenced to TCK falling edge.
6. V alid delay timing for this signal is specified into 150Ω terminated to 1.5 V and 0 pF of external load. For
real system timings these specifications must be derated for external capacitance at 105 ps/pF.
7. Non-Test Outputs and Inputs are the normal output or input signals (except TCK, TRST#, TDI, TDO, and
TMS). These timings correspond to the response of these signals due to boundary scan operations.
8. During Debug Port operation use the normal specified timings rather than the TAP signal timings.
Intel® Pentium® III Processor – Low Power
30 Datasheet
Figure 6 through Figure 16 are to be used in conjunction with Table 11 through Table 19.
Table 18. Quick Start/Deep Sleep AC Specifications
TJ = 0° C to 100° C; VCC = 1.35 V ±100 mV; VCCT = 1.50 V ±115 mV
Symbol Parameter1Min Max Unit Figure Notes
T45 Stop Grant Cycle Completion to Clock Stop 100 BCLKs Figure 14
T46 Stop Grant Cycle Completion to Input Signals Stable 0 µsFigure 14
T47 Deep Sleep PLL Lock Latency 0 30 µ sF igure 14
Figure 15 Note 2
T48 STPCLK# Hold Time from PLL Lock 0 ns Figure 14
T49 Input Signal Hold Time from ST PCLK # Deassert ion 8 BCLKs Figure 14
NOTES:
1. Input signals other than RESET# and BPRI# must be held constant in the Quick Start state.
2. T he BCLK Settling Time specification (T60) applies to Deep Sleep state exit under all conditions.
Table 19. Stop Grant/Sleep/Deep Sleep AC Specifications
TJ = 0° C to 100° C; VCC = 1.35 V ±100 mV; VCCT = 1.50 V ±115 mV
Symbol Parameter Min Max Unit Figure
T50 SLP# Signal Hold Time from S top Grant Cycle Completion 100 BCLKs Figure 15
T51 SLP# Assertion to Input Signals Stable 0 ns Figure 15
T52 SLP# Assertion to Clock Stop 10 BCLKs Figure 15
T54 SLP# Hold Time from PLL Lock 0 ns F igure 15
T55 STPC LK# H ol d Time from SLP# Deassertion 10 BCLKs F igu re 15
T56 Input Signal Hold Time from SLP# Deassertion 10 BCLKs Figure 15
NOTE: Input signals other than RESET# must be held constant in the Sleep state. The BCLK Settling Time
specification (T60) applies to Deep Sleep state exit under all conditions.
Figure 6. PICCLK/TCK Clock Timing Waveform
CLK VH
VLVTRIP
Th
Tl
Tp
Tr
Tf
D0003-01
NOTES:
Tr=T34, T25 (Rise Time)
Tf=T35, T26 (Fall Time)
Th=T32, T2 3 (High Time)
Tl=T33, T24 (Low Time)
Tp=T31, T22 (Period)
VTRIP=1.25 V for PICCLK; 0.75 V for TCK
VL=0.7 V for PICCLK; 0.6 V for TCK
VH=2.0 V for PICCLK; 1.2 V for TCK
Intel® Pentium® III Processor – Low Power
Datasheet 31
Figure 7. BCLK Timing Waveform
Figure 8. Valid Delay Timings
Figure 9. Setup and Hold Timings
CLK VHVTRIP
Th
Tl
Tp
Tr
D0003-02
VL
Tf
1.6V
0.9V
NOTES:
Tr=T5 (Rise Time)
Tf=T6 (Fall Time)
Th=T3 (High Time)
Tl=T4 (Low Time)
Tp=T1 (Period)
VTRIP=1.25 V for BCLK
VL=0.5 V for BCLK
VH=2.0 V for BCLK
CLK
Signal
TXTx
TPW
V Valid Valid
D0004-00
NOTES:
Tx=T7, T11, T29 (Valid Delay)
Tpw=T14, T14B (Pulse Width)
V=VREF for GTL+ signal group; 0.75 V for CMOS,
Open-drain, APIC, and TAP signal groups
CLK
ignal V Valid
Th
Ts
D0005-00
NOTES:
Ts=T8, T12, T27 (Setup Time)
Th=T9, T13, T28 (Hold Time)
V=VREF for GTL+ signals; 0.75 V for CMOS, APIC, and TAP signals
Intel® Pentium® III Processor – Low Power
32 Datasheet
Figure 10. Cold/Warm Reset and Configuration Timings
Figure 11. Power-on Reset Timings
BCLK
RESET#
Configuration
(A[15:5], BREQ0#,
FLUSH#, INIT#,
PICD0)
Tv
Tx
Tt
Tu
Tw
Valid
D0006-01
NOTES:
Tt=T9 (GTL+ Input Hold Time)
Tu=T8 (GTL+ Input Setup Ti me)
Tv=T10 (RESET# Pulse Width)
T18 (RESET#/PWRGOOD Setup Time)
Tw=T16 (Reset Configuration Signals (A[15:5]#, BREQ0#, FLUSH#, INIT#, PICD0) Setup Time)
Tx=T17 (Reset Configuration Signals (A[15:5]#, BREQ0#, FLUSH#, INIT#, PICD0) Hold Time)
BCLK
WRGOOD
RESET#
TaTb
VCC
VREF
VCCT
VIL25,max VIH25,min
D0007-01
NOTES:
Ta=T15 (PWRGOOD Inactive Pulse Width)
Tb=T10 (RESET# Pulse Width)
Intel® Pentium® III Processor – Low Power
Datasheet 33
Figure 12. Test Timings (Boundary Scan)
Figure 13. Test Reset Timings
TCK
TDI, TMS
Input
Signals
TDO
Output
Signals
0.75V
TvTw
TrTs
TxTu
TyTz
D0008-01
NOTES:
Tr=T43 (All Non-Test Inputs Setup Time)
Ts=T44 (All Non-Test Inputs Hold Time)
Tu=T40 (TDO Float Delay)
Tv=T37 (TDI, TMS Setup Time)
Tw=T38 (TDI, TMS Hold Time)
Tx=T39 (TDO Valid Delay)
Ty=T41 (All Non-Test Outputs Valid Delay)
Tz=T42 (All Non-Test Outputs Floa t Delay)
TRST# 0.75V
TqD0009-01
NOTE:
Tq=T36 (TRST# Pulse Width)
Intel® Pentium® III Processor – Low Power
34 Datasheet
Figure 14. Quick Start/Deep Sleep Timing
Figure 15. Stop Grant/Sleep/Deep Sleep Timing
T
w
stpgnt
Running Running
BCLK
STPCLK#
CPU bus
SLP#
Compatibility
Signals Changing
Normal Quick Start Deep Sleep Quick Start Normal
Frozen
T
v
T
y
T
z
T
x
V0010-00
NOTES:
Tv=T45 (Stop Grant Acknowledge Bus Cycle Completion to Clock Shut Off Delay)
Tw=T46 (Setup Time to Input Signal Hold Requirement)
Tx=T47 (Deep Sleep PLL Lock Latency)
Ty=T48 (PLL lock to STPCLK# Hold Time)
Tz=T49 (Input Signal Hold Time)
T
u
stpgnt
Running
BCLK
STPCLK#
CPU bus
SLP#
Compatibility
Signals FrozenChanging
Normal Stop
Grant Sleep Deep Sleep Sleep Stop
Grant Normal
Running
T
t
T
v
T
y
T
z
T
w
T
x
V0011-00
Changing
NOTES:
Tt=T50 (Stop Grant Acknowledge Bus Cycle Completion to SLP# Assertion Delay)
Tu=T51 (Setup Time to Input Signal Hold Requirement)
Tv=T52 (SLP# assertion to clock shut off delay)
Tw=T47 (Deep Sleep PLL lock latency)
Tx=T54 (SLP# Hold Time)
Ty=T55 (STPCLK# Hold Time)
Tz=T56 (Input Signal Hold Time)
Intel® Pentium® III Processor – Low Power
Datasheet 35
4.0 System Signal Simulations
Many scenarios have been simulated to generate a set of GTL+ processor system bus layout
guidelines, which are available in the Mobile Pentium III Processor GTL+ System Bus Layout
Guideline. Systems must be simulated using the IBIS model to determine if they are compliant
with this specification.
4.1 Syst em Bus Clock (BCLK) and PICCLK AC Signal Quality
Specifications
Table 20 and Figure 17 show th e sign al qu ality for the system bus clock (BCLK) signal, and Table
21 and Fig ure 17 show th e signal qu ality for t he APIC bu s clock (PI CCLK) si gnal at the pro cessor.
BCLK and PICCLK are 2.5 V clocks.
Table 20. BCLK Signal Quality Specification
Symbo
lParameter Min Max Unit Figure Notes
V1 VIL,BCLK 0.5 V Figure 17 Note 1
V2 VIH,BCLK 2.0 V Figure 17 Note 1
V3 VIN Absolute Voltage Range -0.7 3.5 V Figure 17 Undershoot/Overshoot,
Note 2
V4 BCLK Rising Edge Ringback 2.0 V Figure 17 Absolute Value, Note 3
V5 BCLK Falling Edge Ringback 0.5 V Figure 17 Ab solute Value, Note 3
NOTES:
1. The clock must rise/fall monotonically between VIL,BCLK and VIH,BCLK.
2. These specifications apply only when BCLK is running, see Table 10 for the DC specifications for when
BCLK is stopped. BCLK may not be above VIH,BCLK,max or below VIL,BCLK,min for more than 50% of the
clock cyc le .
3. The rising and fal ling edge ringback voltage specified is the minimum (rising) or maximum (falling) absolute
voltage the BCLK signal can go to aft er passing the VIH,BCLK (rising) or VIL,BCLK (falling) voltage limits.
Table 21. PICCLK Signal Quality Specifications
Symbol Parameter Min Max Unit Figure Notes
V1 VIL25 0.7 V F igure 17 No te 1
V2 VIH25 2.0 V Figure 17 Note 1
V3 VIN Absolute Voltage Range –0.7 3.5 V Figure 17 Undershoot, Overshoot,
Note 2
V4 PICCLK Rising Edge Ringback 2.0 V Figure 17 Absolute Value, Note 3
V5 PICC LK Falling Edge Ringback 0.7 V Figure 17 Absolute Value, Note 3
NOTES:
1. The clock must rise/fall monotonically between VIL25 and VIH25.
2. T hes e specifications apply only when PICCLK is running, see Table 10 for the DC specifications for when
PICCLK is stopped. PICCLK may not be above VIH25,max or below VIL25,min for more than 50% of the
clock cyc le .
3. The rising and fall ing edge ringback voltage specified is the minimum (rising) or maximum (falling) absolute
voltage the PICCLK signal can go to after passing the VIH25 (rising) or VIL25 (falling) voltage limits.
Intel® Pentium® III Processor – Low Power
36 Datasheet
4.2 GTL+ AC Signal Quality Specifications
Table 22, Figure 18, and Figure 19 illustrate the GTL+ signal quality specifications for the Pentium
III Processor – Low Power. Refer to the Pentium® II Processor Developer’s Manual for the GTL+
buffer specification. The Pentium III Processor – Low Power maximum overshoot and undershoot
specifications for a given duration of time are specified in Table 23. Contact your Intel Field Sales
representative for a copy of the OVERSHOOT_CHECKER tool. The OVERSHOOT_CHECKER
determines if a specific waveform meets the overshoot/undershoot specification. Figure 20 shows
the overshoot/undershoot waveform. The tolerances listed in Table 23 are conservative. Signals
that exceed these tolerances may still meet the processor overshoot/undershoot tolerance if the
OV ERSHOO T_CHE CKER tool says that they pass.
Figure 16. BCLK/PICCLK Generic Clock Wav eform
V0012-01
V1
V2
V3max
V4
V3min
V5
Table 22. GTL+ Signal Group Ringback Specification
Symbol Parameter Min Unit Figure Notes
αOvershoot 100 mV Figure 18
Figure 19 Notes 1, 2
τMinimum Time at High 0.5 ns Figure 18
Figure 19 Notes 1, 2
ρAmplitude of Ringback -200 mV Figure 18
Figure 19 Notes 1, 2, 3
φFinal Settling Voltage 200 mV Figure 18
Figure 19 Notes 1, 2
δDuration of Sequential Ringback N/A ns Figure 18
Figure 19 Notes 1, 2
NOTES:
1. Specified for the edge rate of 0.3 – 0.8 V/ns. See Figure 18 for the generic waveform.
2. All values determined by design/characterization.
3. Ringback below VREF,max + 200 mV is not authorized during low to high transitions. Ringback above
VREF,min – 200 mV is not authorized during high to low transitions.
Intel® Pentium® III Processor – Low Power
Datasheet 37
Figure 17. Low to High, GTL+ Receiver Ringback Tolerance
Figure 18. High to Low, GTL+ Receiver Ringback Tolerance
V
REF,max
+0.2V
Time
τ
δ
ρ
φ
α
V
REF,min
-0.2V
V
REF,max
V
start
Clock
V
IL,BCLK
V
IH,BCLK
V0014-01
V
REF,max
+0.2V
Time
V
REF,min
-0.2V
V
REF,min
V
start
Clock
V
IL,BCLK
V
IH,BCLK
V0014-02
τ
δ
ρ
φ
α
Intel® Pentium® III Processor – Low Power
38 Datasheet
Table 23. GTL+ Signal Group Overshoot/Undershoot Tolerance at the Processor Core
Oversh oot Amplitude Undershoot Amplit ude Allo we d Pulse Duration
2.0 V -0.35 V 0.35 ns
1.9 V -0.25 V 1.2 ns
1.8 V -0.15 V 4.3 ns
NOTES:
1. Under no circum stances should the GTL+ signal voltage ever exceed 2.0 V maximum with respec t to
ground or -2.0 V minimum with respect to VCCT (i.e., VCCT - 2.0 V) under operating conditions.
2. Ringbacks below VCCT cannot be subtracted from overshoots. Lesser undershoot does not allocate
longer or larger overshoot.
3. Ringbacks above ground cannot be subtracted from undershoots. Lesser overshoot does not allocate
longer or larger undershoot.
4. System designers are encouraged to follow Intel provided GTL+ layout guidelines.
5. All values are specified by design characterization and are not tested.
Figure 19. Maximum Acceptable Overshoot/Undershoot Waveform
NOTE:
The total overshoot/undershoot budget for one clock cycle is fully consumed by the α, β, or χ waveforms.
VCCT
2.0V Max
1.9V
1.8V
Vss
Time dependent Overshoot
Time dependent Undershoot
-.15V
-.25V
-.35V Min
α
β
χ
α
β
χ
Intel® Pentium® III Processor – Low Power
Datasheet 39
4.3 Non-GTL+ Signal Quality Specifications
Signals driven to the Pentium III Processor – Low Power should meet signal quality specifications
to ensure that the processor reads data properly and that incoming signals do not affect the long-
term reliability of the proces so r. The Pentium III Processor – L ow Power uses GTL+ buffers for
non-GTL+ signals. The input and output paths of the buffers have been slowed down to match the
requirements for the non-GTL+ signals. The signal qu ality specifications for the non-GTL+ signals
are identical to the GTL+ signal quality specifications except that they ar e relative to VCMOSREF
rather than VREF transitions OVERSHOOT_CHECKER can be used to verify non-GTL+ signal
compliance with the signal overshoot and undershoot tolerance. The tolerances listed in Table 24
are conservative. Signals that exceed these tolerances may still meet the processor overshoot and
undershoot tolerance if the OVERSHOOT_CHECKER tool says that they pass.
4.3.1 PWRGOOD Signal Quality Specifications
The processor requires PWRGOOD to be a clean indication that clocks and the power supplies
(VCC, VCCT, etc.) are stable and within their specifications. Clean implies that the signal will
remain below VIL25 and without errors from the time that the power supplies are turned on, until
they come within specification. The sig n a l will then transition monotonically to a high (2.5 V)
state. PWRGOOD may not ringback below 2.0 V after rising above VIH25.
Table 24. Non-GTL+ Signal Group Overshoot/Undershoot Tolerance at the Processor Core
Overshoo t Amplitude Undershoot Ampl itude Allowed Pulse Dur a tion
2.1 V -0.45 V 0.45 ns
2.0 V -0.35 V 1.5 ns
1.9 V -0.25 V 5.0 ns
1.8 V -0.15 V 17 ns
NOTES:
1. Under no circumstances should the non-G TL+ signal voltage ever exceed 2.1 V maximum with respect to
ground or -2.1 V minimum with respect to VCCT (i.e., VCCT - 2.1 V) under operating conditions.
2. Ring-backs below VCCT cannot be subtracted from overshoots. Lesser undershoot does not allocate
longer or larger overshoot.
3. Ring-backs above ground cannot be subtracted from undershoots. Lesser overshoot does not allocate
longer or larger undershoot.
4. S ys tem designers are encouraged to follow Intel provided non-GTL+ layout guidelines.
5. All values are specified by design characterization, and are not tested.
Intel® Pentium® III Processor – Low Power
40 Datasheet
5.0 Mechanical Specifications
5.1 Surface-mount BG A2 Package Dimensions
The Pentium III Processor – Low Power is packaged in a PBGA-B495 package (also known as
BGA2) with the back of the processor die exposed on top. Unlike previous processors with
exposed die, the back of the Pentium III Processor – Low Power die may be polished and very
smooth. The mechanical specifications for the surface-mount package are provided in Table 25.
Figure 21 shows the top and side views of the surface-mount package, and Figure 22 shows the
bottom view of the surface-mou nt package. The subs trate may only be contacted within the shade d
region between the keep-out outline and the edge of the substrate. The Pentium III Processor – Low
Power will have one or two label marks. Thes e label mar ks will be located along the long edge of
the substrate outside of the keep-ou t region and they will n ot encr oach upo n the 7-mm by 7-mm
squares at the sub strate corn ers . Please n ote that in order to implement VID on the BGA2 package,
some VID[4:0] balls may be depopulated.
Table 25. Surface-mount BGA2 Package Specifications
Symbol Parameter Min Max Unit
A O verall Height, as delivered 2.29 2.79 mm
A1Substrate Height, as delivered 1.50 REF mm
A2Die Height 0.854 REF mm
b Ball Diameter 0.78 REF mm
D Package W idth 27.05 27.35 mm
D1Die Width
D0 Step 8.82 REF (CPUID = 068Ah)
C0 S tep 8.82 REF (CPUID = 0686h)
B0 Step 9.28 REF (CPUID = 0683h)
A2 Step 9.37 REF (CPUID = 0681h)
mm
E Pac kage Length 30.85 31.15 mm
e Ball Pitch 1.27 mm
E1Die Length
D0 S tep 11.00 REF (CPUID = 068Ah)
C0 S tep 10.79 REF (CPUID = 0686h)
B0 Step 11.23 REF (CPUID = 0683h)
A2 Step 11.27 REF (CPUID = 0681h)
mm
N Ball Count 4951each
S1Outer Ball Center to Short Edge of Substrate 0.895 REF mm
S2Outer Ball Center to Long Edge of Substrate 0.900 REF mm
PDIE Allowable Pressure on the Die for Thermal
Solution —689 kPa
W Pac kage Weight 4.5 REF grams
Note: 1. Exact ball count will vary depending on VID[4:0] encoding. See VID[4:0] signal description.
Intel® Pentium® III Processor – Low Power
42 Datasheet
5.2 Si gnal Listings
Figure 22 is a top-s ide view of the ball or pin map of the Pe ntium III Processor – Low Power with
the voltage balls/pins called out. Table 26 lists the signals in ball/pin number o rder. Ta ble 27 lists
the signals in signal name order.
Figure 21. Surface-mount BGA2 Package - Bottom View
NOTE: All dimensions are in millimeters. Dimensions in figure are for reference only, see Table 25 for
specifications
Intel® Pentium® III Processor – Low Power
Datasheet 43
Figure 22. Pin/Ball Map - Top View
NOTES:
1. In order to implement VID on the BGA2 package, some VID[4:0] balls may be depopulated.
2. Ball P1 must be connected to Vcc
V0024-03
VCC OtherVCCT VSS Analog
Decoupling
VSSD30#D21#D23#NCNCNCD10#D14#VSSVSSNCD5#VSSVSSRESET#A33#A32#A29#VSS
D31#D29#D27#VSSD22#D13#VSSD18#D9#D11#D7#VSSD4#VSSVSSVSSVSSA34#A28#A30#VSS
D33#D35#VSSD26#D24#VSSVSSNCD20#D8#VSSD6#VSSD3#D2#BREQ0#A35#A20#A26#A31#A27#
D38#D37#D32#D28#D25#NCD16#NCD15#D17#D1#D0#VSSNCVSSVSSA24#A25#A21#VSSA22#
D45#D43#VSSD34#VREFVREFNCD19#VSSD12#VSSVSSVSSVSSVSSBERR#VREFA15#VSSA23#A19#
D42#VSSVREFA17#VSSA18#A16#
D51#D49#NC
NC
VSSNCA13#
D47#VSSNC
NC
NCVSSA14#
D59#D46#NCVSSA11#A5#A10#
D53#VSSA8#A12#A4#VSSA9#
D55#D60#VSSA6#A3#A7#
D56#VSSNCNCBCLKDEFER#
VSSVSSTESTLO2VSSVSSVSSVSS
DEP5#DEP6#VSSNCNCCLKREF
DEP3#VSSVSSVSSVSSGHI#LOCK#
DEP1#D58#VSSBNR#VSSREQ0#DRDY#
DEP2#VSSVREFBPRI#DEFER#TRDY#RS0#
BINIT#DEP0#PWRGOODREQ1#VSSREQ2#HIT#
BPM0#PRDY#REQ4#VSSREQ3#RP#RS2#
BP3#PICD1TESTLO1HITM#VSSAP1#RSP#
BP2#VSSNCVSSDBSY#RS1#AERR#
PICD0PREQ#VSSVSSADS#AP0#
VSSNCVSSNCVSSVSS
NC
VID2VID0VSS VSS
212019181716151413121110987654321
PLL2
VSS
VSSNCVCCTVCCTVCCTVCCTVCCTVCCTVCCTVCCTVCCTVCCTVCCTVCCT
D44#D39#VCCTVCCT
VSSD48#VCCTVCCT
D61#D54#VCCTVCCT
VSSVSSVCCTVCCT
VSSD50#VCCTVCCT
D56#D63#VCCTVCCT
VSSVSSVCCTVCCT
DEP7#D62#VCCTVCCT
VSSDEP4#VCCTVCCTVCCTVCCTVCCTVCCTVCCTVCCTVCCTVCCTVCCTVCCT
BPM1#VSSVCCTVCCTVCCTVCCTVCCTVCCTVCCTVCCTVCCTVCCTVCCTVCCT
VSSVREFVREFVSSVSSVSSVSSVSSVSSVSSVSSVCCTVCCTVCCT
VSSD41#VCCTVCCT
D57#D52#VCCTVCCT
D36#D40#VREFVSSVSSVSSVSSVSSVSSVSSVSSVSSVSSVSS
NCPICCLK
NC
EDGE
CTRLP
THERM
DA
TRST#VSSBSEL0TCKINIT#
CMOS
REF
VCCTVCCTVCCT
RSVDINTRVSS
THERM
DC
BSEL1VSSVSSSLP#VSSSMI#VSSVCCTVCCTVCCT
NMIVSSNCVSSTDOVSSIGNNE#FERR#STPCLK#VSSFLUSH#VCCTVCCTVCCT
RTT
IMPEDP
CMOS
REF
TESTHIVSSNCTMSTDINCNCA20M#IERR#VCCTVCCTVCCT
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
U
V
W
Y
A
B
C
D
VSS VCC VSS VCC VSS VCC
VCC VSS VCC VSS VCC VSS
VSS VCC VSS VCC VSS
VCC VSS VCC VSS VCC
VSS VCC VSS VCC VSS VCC
VCC VSS VCC VSS VCC VSS
VSS VCC VSS VCC VSS VCC
VCC VSS VCC VSS VCC VSS
VCC VSS VCC VSS VCC VSS
VSS VCC VSS VCC VSS VCC
VCC
VSS
VSS VCC
VCC VSS
VSS VCC
VCC VSS
VSS VCC
VCC VSS
VSS VCC
VCC VSS
VCC VSS
VSS VCC
VSS VCC
VCC VSS
VSS VCC
VCC VSS
VSS VCC
VCC VSS
VSS VCC
VCC VSS
VCC VSS
VSS VCC
VID4
VID3
VID1
PLL1
VCC
Intel® Pentium® III Processor – Low Power
44 Datasheet
Table 26. Signal Listing in Order by Pin/Ball Number (Sheet 1 of 3)
No. Signal Name No. Signal Name No. Signal Name No. Signal Name
A2 VSS C3 A26# E2 A23# G1 A13#
A3 A29# C4 A20# E3 VSS G2 NC
A4 A32# C5 A35# E4 A15# G3 VSS
A5 A33# C6 BREQ0# E5 VREF G4 NC
A6 RESET# C7 D2# E6 BERR# G5 NC
A7 VSS C8 D3# E7 VSS G6 VCCT
A8 VSS C9 VSS E8 VSS G7 VCCT
A9 D5# C10 D6# E9 VSS G8 VCCT
A12 VSS C11 VSS E10 VSS G9 VCCT
A13 D14# C12 D8# E11 VSS G10 VCCT
A14 D10# C13 D20# E12 D12# G11 VCCT
A15 NC C14 NC E13 VSS G12 VCCT
A16 NC C15 VSS E14 D19# G13 VCCT
A17 NC C16 VSS E15 NC G14 VCCT
A18 D23# C17 D24# E16 VREF G15 VCCT
A19 D21# C18 D26# E17 VREF G16 VCCT
A20 D30# C19 VSS E18 D34# G17 VCCT
A21 VSS C20 D35# E19 VSS G18 NC
B1 VSS C21 D33# E20 D43# G19 VSS
B2 A30# D1 A22# E21 D45# G20 D49#
B3 A28# D2 VSS F1 A16# G21 D51#
B4 A34# D3 A21# F2 A18# H1 A14#
B5 VSS D4 A25# F3 VSS H2 VSS
B6 VSS D5 A24# F4 A17# H3 NC
B7 VSS D6 VSS F5 VREF H4 NC
B8 VSS D7 VSS F6 VSS H5 NC
B9 D4# D8 NC F7 VSS H6 VCCT
B10 VSS D9 VSS F8 VSS H7 VSS
B11 D7# D10 D0# F9 VSS H8 VCC
B12 D11# D11 D1# F10 VSS H9 VSS
B13 D9# D12 D17# F11 VSS H10 VCC
B14 D18# D13 D15# F12 VSS H11 VSS
B15 VSS D14 NC F13 VSS H12 VCC
B16 D13# D15 D16# F14 VSS H13 VSS
B17 D22# D16 NC F15 VSS H14 VCC
B18 VSS D17 D25# F16 VSS H15 VSS
B19 D27# D18 D28# F17 VREF H16 VCC
B20 D29# D19 D32# F18 D40# H17 VCCT
B21 D31# D20 D37# F19 D36# H18 D39#
C1 A27# D21 D38# F20 VSS H19 D44#
C2 A31# E1 A19# F21 D42# H20 VSS
Intel® Pentium® III Processor – Low Power
Datasheet 45
H21 D47# K20 VSS M20 VSS R1 LOCK#
J1 A10# K21 D53# N2 VSS R2 NC
J2 A5# L1 A7# N3 VSS R3 VSS
J3 A11# L2 PLL1 N4 VSS R4 VSS
J4 VSS L3 A3# N5 TESTLO2 R5 VSS
J5 NC L4 A6# N6 VCCT R6 VCCT
J6 VCCT L5 VSS N7 VCC R7 VCC
J7 VCC L6 VCCT N8 VSS R8 VSS
J8 VSS L7 VCC N9 VCC R9 VCC
J9 VCC L8 VSS N10 VSS R10 VSS
J10 VSS L9 VCC N11 VCC R11 VCC
J11 VCC L10 VSS N12 VSS R12 VSS
J12 VSS L11 VCC N13 VCC R13 VCC
J13 VCC L12 VSS N14 VSS R14 VSS
J14 VSS L13 VCC N15 VCC R15 VCC
J15 VCC L14 VSS N16 VSS R16 VSS
J16 VSS L15 VCC N17 VCCT R17 VCCT
J17 VCCT L16 VSS N18 VSS R18 D63#
J18 D41# L17 VCCT N19 VSS R19 D56#
J19 VSS L18 D48# N20 VSS R20 VSS
J20 D46# L19 VSS P1 VCC R21 DEP3#
J21 D59# L20 D60# P2 CLKREF T1 DRDY#
K1 A9# L21 D55# P3 NC T2 REQ0#
K2 VSS M2 PLL2 P4 NC T3 VSS
K3 A4# M3 BCLK P5 VSS T4 BNR#
K4 A12# M4 NC P6 VCCT T5 VSS
K5A8#M5NC P7VSST6VCCT
K6 VCCT M6 VCCT P8 VCC T7 VSS
K7 VSS M7 VSS P9 VSS T8 VCC
K8 VCC M8 VCC P10 VCC T9 VSS
K9 VSS M9 VSS P11 VSS T10 VCC
K10 VCC M10 VCC P12 VCC T11 VSS
K11 VSS M11 VSS P13 VSS T12 VCC
K12 VCC M12 VCC P14 VCC T13 VSS
K13 VSS M13 VSS P15 VSS T14 VCC
K14 VCC M14 VCC P16 VCC T15 VSS
K15 VSS M15 VSS P17 VCCT T16 VCC
K16 VCC M16 VCC P18 D50# T17 VCCT
K17 VCCT M17 VCCT P19 VSS T18 VSS
K18 D52# M18 D54# P20 DEP6# T19 VSS
K19 D57# M19 D61# P21 DEP5# T20 D58#
Table 26. Signal Listing in Order by Pin/Ball Number (Sheet 2 of 3)
No. Signal Name No. Signal Name No. Signal Name No. Signal Name
Intel® Pentium® III Processor – Low Power
46 Datasheet
T21 DEP1# V20 DEP0# Y19 VSS AB18 INTR/LINT0
U1 RS0# V21 BINIT# Y20 PICD1 AB19 RSVD
U2 TRDY# W1 RS2# Y21 BP3# AB20 PREQ#
U3 DEFER# W2 RP# AA1 AERR# AB21 PICD0
U4 BPRI# W3 REQ3# AA2 RS1# AC1 VSS
U5 VREF W4 VSS AA3 DBSY# AC2 VSS
U6 VCCT W5 REQ4# AA4 VSS AC3 NC
U7 VCC W6 VCCT AA5 NC AC4 VID3
U8 VSS W7 VCCT AA6 VCCT AC5 VSS
U9 VCC W8 VCCT AA7 VCCT AC6 VCCT
U10 VSS W9 VCCT AA8 VCCT AC7 VCCT
U11 VCC W10 VCCT AA9 CMOSREF AC8 VCCT
U12 VSS W11 VCCT AA10 INIT# AC9 FLUSH#
U13 VCC W12 VCCT AA11 TCK AC10 VSS
U14 VSS W13 VCCT AA12 BSEL0 AC11 STPCLK#
U15 VCC W14 VCCT AA13 VSS AC12 FERR#
U16 VSS W15 VCCT AA14 TRST# AC13 IGNNE#
U17 VCCT W16 VCCT AA15 THERMDA AC14 VSS
U18 D62# W17 VCCT AA16 EDGECTRLP AC15 TDO
U19 DEP7# W18 VSS AA17 NC AC16 VSS
U20 VSS W19 BPM1# AA18 PICCLK AC17 NC
U21 DEP2# W20 PRDY# AA19 NC AC18 VSS
V1 HIT# W21 BPM0# AA20 VSS AC19 NMI/LINT1
V2 REQ2# Y1 RSP# AA21 BP2# AC20 NC
V3 VSS Y2 AP1# AB1 AP0# AC21 VSS
V4 REQ1# Y3 VSS AB2 ADS# AD1 VSS
V5 PWRGOOD Y4 HITM# AB3 VSS AD2 VID0
V6 VCCT Y5 TESTLO1 AB4 VID4 AD3 VID1
V7 VCCT Y6 VCCT AB5 VSS AD4 VID2
V8 VCCT Y7 VCCT AB6 VCCT AD5 VSS
V9 VCCT Y8 VCCT AB7 VCCT AD6 VCCT
V10 VCCT Y9 VSS AB8 VCCT AD7 VCCT
V11 VCCT Y10 VSS AB9 VSS AD8 VCCT
V12 VCCT Y11 VSS AB10 SMI# AD9 IERR#
V13 VCCT Y12 VSS AB11 VSS AD10 A20M#
V14 VCCT Y13 VSS AB12 SLP# AD13 TDI
V15 VCCT Y14 VSS AB13 VSS AD14 TMS
V16 VCCT Y15 VSS AB14 VSS AD15 NC
V17 VCCT Y16 VSS AB15 BSEL1 AD16 VSS
V18 DEP4# Y17 VREF AB16 THERMDC AD17 TESTHI
V19 VSS Y18 VREF AB17 VSS AD18 CMOSREF
AD19 RTTIMPEDP AD20 NC AD21 VSS
NOTE: Ball P1 must be connected to Vcc.
Table 26. Signal Listing in Order by Pin/Ball Number (Sheet 3 of 3)
No. Signal Name No. Signal Name No. Signal Name No. Signal Name
Intel® Pentium® III Processor – Low Power
Datasheet 47
Table 27. Signal Listing in Order by Signal Name (Sheet 1 of 3)
No. S ignal Name Signal Buffer Type N o. Signal Name Signal Buffer Type
L3 A3# GTL+ I/O T4 BNR# GTL+ I/O
K3 A4# GTL+ I/O AA21 BP 2# GTL+ I/O
J2 A5# GTL+ I/O Y21 BP 3# GTL+ I/O
L4 A6# GTL+ I/ O W21 BPM0# GTL+ I/O
L1 A7# GTL+ I/ O W19 BPM1# GTL+ I/O
K5 A8# GTL+ I/O U4 BPRI# GTL+ Input
K1 A9# GTL+ I/O C 6 BREQ0# GTL+ I/O
J1 A10# GTL+ I/O AA12 B SE L0 3.3V CMOS Input
J3 A11# GTL+ I/O AB15 B SE L1 3.3V CMOS Input
K4 A12# GTL+ I/O P2 CLKREF BCLK Reference Voltage
G1 A13# GTL+ I/O AA9 CMOSREF CMOS Reference Voltage
H1 A14# GTL+ I/O AD18 CMOSREF CMOS Reference Voltage
E4 A15# GTL+ I/O D10 D0# GTL+ I/O
F1 A16# GTL+ I/O D 11 D1# GTL+ I/O
F4 A17# GTL+ I/O C7 D2# GTL+ I/O
F2 A18# GTL+ I/O C8 D3# GTL+ I/O
E1 A19# GTL+ I/O B9 D4# GTL+ I/O
C4 A20# GTL+ I/O A 9 D5# GTL+ I/O
D3 A21# GTL+ I/O C10 D6# GTL+ I/O
D1 A22# GTL+ I/O B11 D7# GTL+ I/O
E2 A23# GTL+ I/O C12 D8# GTL+ I/O
D5 A24# GTL+ I/O B13 D9# GTL+ I/O
D4 A25# GTL+ I/O A14 D10# GTL+ I/O
C3 A26# GTL+ I/O B12 D11# GT L+ I/O
C1 A27# GTL+ I/O E12 D12# GTL+ I/O
B3 A28# GTL+ I/O B16 D13# GTL+ I/O
A3 A29# GTL+ I/O A13 D14# GTL+ I/O
B2 A30# GTL+ I/O D13 D15# GTL+ I/O
C2 A31# GTL+ I/O D15 D16# GTL+ I/O
A4 A32# GTL+ I/O D12 D17# GTL+ I/O
A5 A33# GTL+ I/O B14 D18# GTL+ I/O
B4 A34# GTL+ I/O E14 D19# GTL+ I/O
C5 A35# GTL+ I/O C13 D20# GTL+ I/O
AD10 A20M# 1.5V CMOS Input A19 D21# GTL+ I/O
AB2 ADS# GTL+ I/O B17 D22# GT L+ I/O
AA1 AERR# GTL+ I/O A18 D23# GTL+ I/O
AB1 AP0# GTL+ I/O C17 D24# GT L+ I/O
Y2 AP1# GTL+ I/O D17 D25# GTL+ I/O
M3 BCLK 2.5V Clock Input C18 D26# GTL+ I/O
E6 BERR# GTL+ I/O B19 D27# GTL+ I/O
V21 BINIT# GTL+ I/O D18 D28# GTL+ I/O
Intel® Pentium® III Processor – Low Power
48 Datasheet
B20 D29# GTL+ I/O V18 DEP4# GTL+ I/O
A20 D30# GTL+ I/O P21 DEP5# GTL+ I/O
B21 D31# GTL+ I/O P20 DEP6# GTL+ I/O
D19 D32# GTL+ I/O U19 DEP7# GTL+ I/O
C21 D33# GTL+ I/O T1 DRDY# GTL+ I/O
E18 D34# GTL+ I/O AA16 EDGECTRLP GTL+ Control
C20 D35# GTL+ I/O AC12 FERR# 1.5V Open Drain Output
F19 D36# GTL+ I/O AC9 FLUSH# 1.5V CMOS Input
D20 D37# GTL+ I/O V1 HIT# GTL+ I/O
D21 D38# GTL+ I/O Y4 HITM# GTL+ I/O
H18 D39# GTL+ I/O AD9 IERR# 1.5V Open Drain Output
F18 D40# GTL+ I/O AC13 IGNNE# 1.5V CMOS Input
J18 D41# GTL+ I/O AA10 INIT# 1.5V CMOS Input
F21 D42# GTL+ I/O AB18 INTR/LINT0 1.5V CMOS Input
E20 D43# GTL+ I/O R1 LOCK# GTL+ I/O
H19 D44# GTL+ I/O AC19 NMI/LINT1 1.5V CMOS Input
E21 D45# GTL+ I/O AA18 PICCLK 2.5V APIC Clock Input
J20 D46# GTL+ I/O AB21 PICD0 1.5V Open Drain I/O
H21 D47# GTL+ I/O Y20 PICD1 1.5V Open Drain I/O
L18 D48# GTL+ I/O L2 PLL1 PLL Analog Voltage
G20 D49# GT L+ I/O M2 PLL2 PLL Analog Voltage
P18 D50# GTL+ I/O W20 PRDY# GTL+ Output
G21 D51# GTL+ I/O AB20 PREQ# 1.5V CMOS Input
K18 D52# GTL+ I/O V5 PWRGOOD 2.5V CMOS Input
K21 D53# GTL+ I/O T2 REQ0# GTL+ I/O
M18 D54# GTL+ I/O V4 REQ1# GTL+ I/O
L21 D55# GTL+ I/O V2 REQ2# GTL+ I/O
R19 D56# GTL+ I/O W3 REQ3# GTL+ I/O
K19 D57# GTL+ I/O W5 REQ4# GTL+ I/O
T20 D58# GTL+ I/O U1 RS0# GTL+ Input
J21 D59# GTL+ I/O A6 RESET# GTL+ Input
L20 D60# GTL+ I/O W2 RP# GTL+ I/O
M19 D61# GTL+ I/O AA2 RS1# GTL+ Input
U18 D62# GTL+ I/O W1 RS2# GTL+ Input
R18 D63# GTL+ I/O Y1 RSP# GTL+ Input
AA3 DBSY# GTL+ I/O AB19 RSVD Reserved
U3 DEFER# GTL+ Input AD19 RTTIMPEDP GTL+ Pull-up Control
V20 DEP0# GTL+ I/O AB12 SLP# 1. 5V CMOS Input
T21 DEP1# GTL+ I/O AB10 SMI# 1.5V CMOS Input
U21 DEP2# GTL+ I/O AC11 STPCLK# 1.5V CMOS Input
R21 DEP3# GTL+ I/O
Table 27. Signal Listing in Order by Signal Name (Sheet 2 of 3)
No. Signal Name Signal Buffer Type No. Signal Name Signal Buffer Type
Intel® Pentium® III Processor – Low Power
Datasheet 49
AA11 TCK 1.5V JTAG Clock Input AA14 TRST# JTAG Input
AD13 TDI JTAG Input AD2 VID0 Voltage Identification
AC15 TDO JTAG Output AD3 VID1 Voltage Identification
AD17 TESTHI Test Input AD4 VID2 Voltage Identification
Y5 TESTL O1 Test Input A C4 VID3 Voltage Identification
N5 TES TL O2 Test Input AB4 V ID4 Voltage Identification
AD20 NC Core Voltage Test
Point E5 VREF GTL+ Reference Voltage
H4 NC Core Voltage Test
Point E16 VREF GTL+ Reference Voltage
AA17 NC Core Voltage Test
Point E17 VREF GTL+ Reference Voltage
G4 NC Core Voltage Test
Point F5 VREF GTL+ Reference Voltage
AA15 THERMDA Thermal Diode Anode F17 VREF GTL+ Reference Voltage
AB16 THERMDC Thermal Diode
Cathode U5 VREF GTL+ Reference Voltage
AD14 TMS JTAG Input Y17 VREF GTL+ Reference Voltage
U2 TRDY# GTL+ Input Y18 VREF GTL+ Reference Voltage
Table 28. Voltage and No-Connect Pin/Ball Locations
Signal
Name Pi n/Ball Numbers
NC A15 , A16, A17 , C1 4 , D 8 , D 1 4 , D 1 6 , E 1 5 , G 2 , G4, G5, G1 8, H3, H 4 , H 5 , J 5, M 4 , M 5 , P3 , P 4 , R 2 ,
AA5, AA17, AA19, AC3, AC17, AC20, AD15, AD20
VCC H8, H10, H12, H14, H16, J7, J9, J1 1, J13, J15, K8, K10, K12, K14, K16, L7, L9, L11, L13, L15, M8,
M10, M12, M14, M16, N7, N9, N11, N13, N15, P1, P8, P10, P12, P14, P16, R7, R9, R11, R13,
R15, T8, T10, T12, T14, T16, U7, U9, U11, U13, U15
VCCT
G6, G7, G8, G9, G10, G11, G12, G13, G14, G15, G16, G17, H6, H17, J6, J17, K6, K17, L6, L17,
M6, M17, N6, N17, P6, P17, R6, R17, T6, T17, U6, U17, V6, V7, V8, V9, V10, V11, V12, V13, V14,
V15, V16, V17, W6, W7, W8, W9, W10, W11, W12, W13, W14, W15, W16, W17, Y6, Y7, Y8, AA6,
AA7, AA8, AB6, AB7, AB8, AC6, AC7, AC8, AD6, AD7, AD8
VSS
A2, A7, A8, A12, A21, B1, B5, B6, B7, B8, B10, B15, B18, C9, C11, C15, C16, C19, D2, D6, D7,
D9, E3, E7, E8, E9, E10, E11, E13, E19, F3, F6, F7, F8, F9, F10, F11, F12, F13, F14, F15, F16,
F20, G3, G19, H2, H7, H9, H11, H13, H15, H20, J4, J8, J10, J12, J14, J16, J19, K2, K7, K9, K11,
K13, K15, K20, L5, L8, L10, L12, L14, L16, L19, M7, M9, M11, M13, M15, M20, N2, N3, N4, N8,
N10, N12, N14, N16, N18, N19, N20, P5, P7, P9, P11, P13, P15, P19, R3, R4, R5, R8, R10, R12,
R14, R16, R20, T3, T5, T7, T9, T11, T13, T15, T18, T19, U8, U10, U12, U14, U16, U20, V3, V19,
W4, W18, Y3, Y9, Y10, Y11, Y12, Y13, Y14, Y15, Y16, Y19, AA4, AA13, AA20, AB3, AB5, AB9,
AB11, AB1 3, AB14, AB17, AC1, AC2, AC 5, AC10, AC14, AC16, AC18, AC21, AD1, AD5, AD16,
AD21
NOTE: Pin/ball P1 must be connected to Vcc:
Table 27. Signal Listing in Order by Signal Name (Sheet 3 of 3)
No. S ignal Name Signal Buffer Type N o. Signal Name Signal Buffer Type
Intel® Pentium® III Processor – Low Power
50 Datasheet
6.0 Thermal Specifications
This section provides needed data fo r designing a thermal solution. The Pentium III Processor –
Low Power is a surface mount PBGA-B495 package with the back of the processor die exposed
and has a specified operational junction temperature (TJ) limit.
In order to achieve proper cooling of the processor, a thermal solution (e.g., heat spreader, heat
pipe, or other heat transfer system) must make firm contact to the exposed processor die. The
processor die must be clean before the thermal solution is attached or the processor may be
damaged.
Table 29 provides the maximum Thermal Design Power (TDPMAX) dissipation and the minimum
and maximum TJ temperatures for the Pentium III Processor – Low Power. A thermal solu tion
should be designed to ensure the junction temperature never exceeds these specifications. If no
closed loop thermal fail-saf e m echanism (processor throttling) is present to m a intain TJ with in
specification then the th ermal so lution should be designed to cool the TDPMAX condition. If a
thermal fail-safe mechanism is present then thermal solution could possibly be designed to a
typical Thermal Design Power (TDPTYP). TDPTYP is a thermal desig n power recommendation
based on the power dissipation of the processor while executing publicly available software under
normal operating cond itions at nominal voltages. TDPTYP power is lower than TDPMAX. Contact
your Intel Field Sales Representative for further information.
Table 29. Power Specifications for the Pentium III Processor – Low Power
Symbol Parameter Min TDPTYP1Max Unit Notes
TDP
Thermal Design Power
at 1.35 V (for 700 MHz)
at 1.35 V (for 500 MHz)
at 1.35 V (for 400 MHz)
10.2
7.9
6.5
16.1
12.2
10.1 W at 100°C
Notes 2, 3
PSGNT
Stop Grant and Auto Halt power
at 1.35 V (for 700 MHz)
at 1.35 V (for 500 MHz)
at 1.35 V (for 400 MHz)
1.6
1.1
1.1
W
W
W
at 50°C
Note 3
PQS
Quick Start and Sleep power
at 1.35 V (for 700 MHz)
at 1.35 V (for 500 MHz)
at 1.35 V (for 400 MHz)
1.2
800
650
W
mW
mW
at 50°C
Note 3
PDSLP
Deep Sleep power
at 1.35 V (for 700 MHz)
at 1.35 V (for 500 MHz)
at 1.35 V (for 400 MHz)
0.4
300
150
W
mW
mW
at 35°C
Note 3
TJJunction Temperature 0 100 °CNote4
NOTES:
1. TDPTYP is a recommendation based on the power dissipation of the processor while executing publicly
available software under normal operating conditions at nominal v oltages. Contact your Intel Field Sales
Representative for further information. Not 100% tested.
2. TDPMAX is a specification of the total power dissipat ion of the processor while executing a worst-case
instruction mix under normal operating conditions at nominal voltages. It includes the power dissipated by
all of the components within the processor. Not 100% tested. Specified by design/characterization.
3. Not 100% tested or guaranteed. The power specifications are composed of the current of the processor on
the various voltage planes. These curren ts are measured and specified at high temperature in Table 7.
These power specifications are determined by characterization of the processor currents at higher
temperatures.
4. TJ is measured with the on-die thermal diode.
Intel® Pentium® III Processor – Low Power
Datasheet 51
6.1 Thermal Diode
The Pentium III Processor – Low Power has an on-die thermal diode that can be used to monitor the
die temperature (TJ). A thermal sensor located on the motherb oard, or a stand- alone measur ement
kit, may monitor the die temperature of the processor for thermal management or instrumentation
purposes. Table 30 and Table 31 provide the diode interface and specifications.
Note: The reading of the thermal sensor connected to the thermal diode will not necessarily reflect
the temperature of the hottest location on the die. This is due to inaccuracies in the thermal sensor,
on-die temperature gradients between the location of the thermal diode and the hottest location on
the die, and time based variations in the die temperature measurement. Time based variations can
occur when the sampling rate of the thermal diode (by the therm al sensor) is slower than the rate at
which the TJ temperature can change.
Table 30. Thermal Diode Interface
Signal Name Pin/Ball Number Signal Description
THERMDA AA15 Thermal diode anode
THERMDC AB16 Thermal diode cathode
Table 31. Thermal Diode Specifications
Symbol Parameter Min Typ Max Unit Notes
IFW Forward Bias Current 5 500 µANote 1
n Diode Ideality Factor 1.0057 1.0080 1.0125 Notes 2, 3, 4
NOTES:
1. Intel does not support or recommend operation of the thermal diode under reverse bias. Intel does not
support or recommend operation of the thermal diode when the processor power supplies are not within
their specified tolerance range.
2. Characterized at 100° C.
3. Not 100% tested. Specified by design/characterization.
4. T he ideality factor, n, represents the deviation from ideal diode behavior as exemplified by the diode
equation:
Where Is = saturation current, q = electronic charge, VD = voltage across the diode, k = Boltzmann
Constant, and T = absolute temperature (Kelvin).
IFW = ISe
qVD
nkT – 1
Intel® Pentium® III Processor – Low Power
52 Datasheet
7.0 Processor Initialization and Configuration
7.1 Description
The Pentium III Processor – Low Power has some configuration options that are determined by
hardware and some that are determined by software. The processor samples its hardware
configuration at reset on the active-to-inactive transition of RESET#. Most of the configuratio n
options for the Pentium III Processor – Low Power are identical to those of the Pentium II
processor. The Pentium® II Processor Developer’s Manual describes these configuration opti ons.
New configuration options for the Pentium III Processor – Low Power are described in the
remainder o f this section.
7.1.1 Quick Start Enable
The processor normally enters the Stop Grant state when the STPCLK# signal is asserted but it will
enter the Quick Start state instead if A15# is sampled active on the RESET# signal’s activ e-to-
inactive transition. The Quick Start state supports snoops from the bus priority device like the Stop
Grant state but it does not support symmetric master snoops nor is the latching of interrupts
su pported. A “1” in bit position 5 of the Power-on Configuration register indicates that the Quick
Start state has been enabled.
7.1.2 System Bus Frequency
The current generation Pentium III Processor – Low Power will only fun ction with a system bus
frequency of 100 MHz. Bit positions 18 to 19 of the Power-on Configuration register indicates at
which speed a processor will run. A “00” in bits [19:18] indicates a 66-MHz bu s frequ ency, a “10”
indicates a 100-MHz bus frequency, and a “01” indicates a 133-MHz bus frequency.
7.1.3 APIC Enabl e
If the PICD0 signal is sampled low on the active-to-inactive transition of the RESET# signal then
the PICCLK signal can be tied to VSS. Otherwise the PICD[1:0 ] signals must be pulled up to VCCT
and PICCLK must be supp lied. Driving PICD0 low at reset also has the ef fect o f clearing the APIC
Global Enable bit in the APIC Base MSR. This bit is normally set when the processor is reset, but
when it is cleared the APIC is co mpletely disabled until the next reset.
7.2 Clock Frequencies and Ratios
The Pentium III Processor – Low Power us es a cl ock desig n in which t he bu s cloc k is mu ltiplie d by
a ratio to produce the processor’s internal (or “core”) clock. Unlike some of the Pentium III
Processor – Low Power, the ratio used is programmed into the processor during manufacturing.
The bus ratio programmed into the processor is visible in bit positio ns 22 to 25 and bit 27 of th e
Power-on Configuration register. Table 12 shows the 5-bit codes in the Power-on Configuration
register and their corresponding bus ratios.
Intel® Pentium® III Processor – Low Power
Datasheet 53
8.0 Processor Interface
8.1 Al phabetical Sign al Reference
8.1.1 A[35:3]# (I/O - GTL+)
The A[35:3]# (Address) signals define a 236-byte physical memory address space. When ADS# is
active, these signals transmit the address of a transaction; when ADS# is inactive, these signals
transmit transaction information. These signals must be connected to the appropriate pins/balls of
both agents on the system bus. The A[35:24]# signals are protected with the AP1# parity signal,
and the A[23:3]# signals are protected with the AP0# parity signal.
On the active-to-inactive tran sition of RESET#, each processor bus agen t samples A[35:3]# s ignals
to determine its power-on configuration. See Section 4.0 of this document and the Pentium® II
Processor Developer’s Manual for detai ls.
8.1.2 A20M# (I - 1.5 V Tolerant)
If the A20M# (Addres s-20 Mask) i nput si gnal is assert ed, the pr ocesso r masks phy sical addr ess bit
20 (A20#) befor e looking u p a line in any internal cach e and b efore d riving a read/write trans action
on the bus. Asserting A20M# emulates the 8086 processor’s address wrap-around at the 1-Mbyte
boundary. Assertion of A20M# is only supported in Real mode.
8.1.3 ADS# (I/O - GTL+)
The ADS# (Address Strobe) signal is asserted to indicate the validity of a transaction address on
the A[35:3]# sign als. Both bus agents observe the AD S# activation to begin parity checking,
protocol checking , address decode, inter nal snoop or deferr ed reply ID match operations ass ociated
with the new transaction. T his signal must be connected to the appropriate pin s/balls on both agents
on the system bus.
8.1.4 AERR# (I/O - GTL+)
The AERR# (Addr ess Par ity Erro r) signal is obs erved and driven by both sys tem bus agen ts, and i f
used, must be connected to the appropriate pins/balls of both agents on the system bus. AERR#
observation is optionally enabled during power-on configuration; if enabled, a valid assertion of
AERR# aborts the current transaction.
If AERR# observation is disabled during power-on configuration, a central agent may handle an
assertion of AERR# as appropriate to the error handling architecture of the system.
8.1.5 AP[1:0]# (I/O - GTL+)
The AP[1:0]# (Address Parity) signals are driven by the request initiator along with ADS#,
A[35:3]#, REQ[4:0]# and RP#. AP1# covers A[35:24]#. AP0# covers A[23:3]#. A correct parity
signal is high if an even number of covered signals are low and low if an odd number of covered
Intel® Pentium® III Processor – Low Power
54 Datasheet
signals are low. This allows parity to be high when all the covered signals are high. AP[1:0]#
should be connected to the appropriate pins/balls on both agents on the system bus.
8.1.6 BCLK (I - 2.5 V Tolerant)
The BCLK (Bus Clock) signal determines the system bus frequency. Both system bus agents must
receive this signal to drive their outputs and latch their inputs on the BCLK rising edge. All
external timing parameters are specified with respect to the BCLK signal.
8.1.7 BERR# (I/O - GTL+)
The BERR# (Bus Error) sign al is asserted to indicate an unrecoverable error without a bus prot ocol
violation. It may be driven by either system bus agent and must be connected to the appropriate
pins/balls of both agents, if used. However , the Pentium III Processor – Low Power do not ob serve
assertions of the BERR# signal.
BERR# assertion conditions are defined by the system configuration. Configuration options enable
the BERR# driver as follows:
•Enabled or disabled
•Asserted optio nally for internal errors along with IERR#
•Asserted optionally by the request initiator of a bus transaction after it observes an error
•Asserted by any bus agent when it observes an error in a bus transaction
8.1.8 BINIT# (I/O - GTL+)
The BINIT# (Bus Initialization) signal may be observed and driven by both system bus agents and
must be connected to the appropriate pins/balls of both agents, if used. If the BINIT# driver is
enabled during the power-on configuration, BINIT# is asserted to signal any bus condition that
prevents reliable future information.
If BINIT# i s enabled during power - on configuration, and B IN IT# is samp l ed as s ert ed, all bus s t ate
machines are reset and any data which was in transit is lost. All agents reset th eir rotating ID for
bus arbitration to the state after reset, and internal count information is lost. The L1 and L2 caches
are not affected.
If BINIT# is disabled during power-on configuration, a central agent may handle an assertion of
BINIT# as appropriate to the Machine Check Architecture (MCA) of the system.
8.1.9 BNR# (I/O - GTL+)
The BNR# (Block Next Request) signal is used to assert a bus stall by any bus agent that is unable
to accept new bus transactions. During a bus stall, the current bus owner cannot issue any new
transactions.
Since multiple agents may need to request a bus stall simultaneousl y, BNR# is a wired-OR signal
that must be connected to the appropriate pins/balls of both agents on the system bus. In order to
avoid wire-OR glitches associated with simultaneous edge transitions driven by multiple drivers,
BNR# is activated on specific clock edges and sampled on specific clock edges.
Intel® Pentium® III Processor – Low Power
Datasheet 55
8.1.10 BP[3:2]# (I/O - GTL+ )
The BP[3:2]# (Breakpoint) signals are the System Support group Breakpoint signals. They are
outputs from the processor that indicate the status of breakpoints.
8.1.11 BPM[1:0]# (I/O - GTL+)
The BPM[1:0]# (Breakpoint Monitor) signals are breakpoint and performance monitor signals.
They are outputs from the processor that indicate the status of breakpoints and programmable
counters used for monitoring processor perf ormance.
8.1.12 BPRI# (I - GTL+)
The BPRI# (Bus Priority Request) signal is used to arbitrate for ownership of the system bus. It
must be connected to the appropriate pins/balls on both agents on the system bus. Observing
BPRI# active (as asserted by the priority agent) causes the processor to stop issuing new requests,
unless such requests are part of an ongoing locked operation. The priority agent keeps BPRI#
asserted until all of its requests are completed and then releases the bus by deasserting BPRI#.
8.1.13 BREQ0# (I/O - GTL+)
The BREQ0# (Bus Request) signal is a processor Arbitration Bus signal. The processor indicates
that it wants ownership of the system bus by asserting the BREQ0# signal.
During power-up configuration, the central agent must assert the BREQ0# bus signal. The
processor samples BREQ0# on the active-to-inactive transition of RESET#. Optionally, this signal
may be grounded with a 10ohm resistor.
8.1.14 BSEL[1:0 ] (I – 3.3 V Tole rant)
The BSEL[1:0] (Select Processor System Bus Speed) signal is used to configure the processor for
the system bus frequ ency. Table 32 shows the encoding scheme for BSE L[1:0]. The only suppo rted
system bus freq uency fo r the Pent ium III Processor – Low Power is 100 MHz. If anoth er frequen cy
is used or if the BSEL[1:0] signals are not driv en with “01” then the pr ocessor is not guaran teed to
function properly.
8.1.15 CLKREF (Analog)
The CLKREF (System Bus Clock Reference) signal provides a reference voltage to define the trip
point for t he BCLK s ignal. Th i s si gnal sho ul d b e conn ect ed to a resi s tor d i vi der to gen e rate 1.25 V
from the 2.5-V supply.
Table 32. BSEL[1:0] Encoding
BSEL[1:0] Sy stem Bus Frequency
00 66 MHz
01 100 MHz
10 Reserved
11 133 MHz
Intel® Pentium® III Processor – Low Power
56 Datasheet
8.1.16 CMOSREF (Analog)
The CMOSREF (CMOS Reference Voltage) signal provides a DC level reference voltage for the
CMOS input buffers. A voltage divider should be used to divide a stable voltage plane (e.g., 2.5 V
or 3.3 V). This signal must be provided with a DC voltage that meets the VCMOSREF specification
from Table 10.
8.1.17 D[63:0]# (I/O - GTL+)
The D[63:0]# (Data) signals are the data signals. These signals provide a 64-bit data path between
both system bus agents, and must be connected to the appropriate pins/balls on both agents. The
data driver asserts DRDY# to indicate a valid data transfer.
8.1.18 DBSY# (I/O - GTL+)
The DBSY# (Data Bus Busy) signal is asserted by the agent responsible for driving data on the
system bus to in dicat e that the data bus is in use. The data bus is released after DBSY# is
deasserted. This signal must be connected to the appropriate pins/balls on both agents on the
syste m bus.
8.1.19 DEFER# (I - GTL+)
The DEFER# (Defer) signal is asserted by an agent to indicate that the transaction cannot be
guaranteed in-order completion. Assertion of DEFER# is normally the responsibility of the
addressed memory agent or I/O agent. This signal must be connected to the appropriate pins/balls
on both agents on the system bus.
8.1.20 DEP[7:0]# (I/O - GTL+)
The DEP[7:0]# (Data Bus ECC Protection) signals provide optional ECC protection for the data
bus. They are driven by the agent responsible for driving D[63:0]#, and must be connected to the
appropriate pins/balls on both agents on the system bus if they are used. During power-on
configuration, DEP[7:0]# signals can be enabled for ECC checking or disabled for no checking.
8.1.21 DRDY# (I/O - GTL+)
The DRDY# (Data Ready) signal is asserted by the data driver on each data transfer, indicating
valid data on the data bus. In a multi-cycle data transfer, DRDY# can be deasserted to insert idle
clocks. This signal must be connected to the appropriate pins/balls on both agents on the system
bus.
8.1.22 EDGCTRLP (Analog)
The EDGCTRLP (Edge Rate Control) s ign al is u sed to con figu re the edge rate o f the GTL+ output
buffers. Connect the signal to VSS with a 110-Ω, 1% resistor.
Intel® Pentium® III Processor – Low Power
Datasheet 57
8.1.23 FERR# (O - 1.5 V Tolerant Open-drain)
The FERR# (Floating-point Error) signal is asserted when the processor detects an unmasked
floating-point error. FERR# is similar to the ERROR# signal on the Intel 387 coprocessor, and it is
included for compatib ility with systems using DOS-ty pe floating-point error reportin g.
8.1.24 FLUSH# (I - 1.5 V Tolerant)
When the FLUSH# (Flush) input signal is asserted, the processor writes back all internal cache
lines in the Modified state and invalidates all internal cache lines. At the completion of a flush
operation, the processor issues a Flush Acknowledge transaction. The pro cessor stops caching any
new data while the FLUSH# signal remains asserted.
On the active-to-inactive transition of RESET#, each processor bus agent samples FLUSH# to
determine its power-on configuration.
8.1.25 GHI# (I - 1.5 V Tolerant)
Note: This is a No Connect on the Pentium III Processor – Low Power.
The GHI# signal controls wh ich operating mode bus ratio is selected in a mob ile Pen tium III
Processor featuring Intel SpeedStep™ technology. On the processor featuring Intel SpeedStep
technology, this signal is latched when BCLK restarts in Deep Sleep state and determines which of
two bus ratios is selected for operation. This signal is ignored when the processor is not in the Deep
Sleep state. This signal is a “Don’t Care” (No Connect) on processors that do not feature Intel
SpeedStep technology. This signal has an on-die pull-up to VCCT and should be driven with an
open-drain driver with no extern al pull- up.
8.1.26 HIT# (I/O - GTL+), HITM# (I/O - GTL+)
The HIT# (Snoop Hit) and HITM# (Hit Modified) signals convey transaction snoop operation
results, and must be connected to the appropriate pins/balls on both agents on the system bus.
Either bus agent can assert both HIT# and HITM# tog ether to indicate that it requires a snoop stall,
which can be continued by reasserting HIT# and HITM# together.
8.1.27 IERR# (O - 1.5 V Tolerant Open-drain)
The IERR# (Internal Error) signal is asserted by the processor as the result of an internal error.
Assertion of IERR# is usually accomp anied by a SHUTDOWN transaction on the system bus. This
transaction may optionally be converted to an external error signal (e.g., NMI) by system logic.
The processor will keep IERR# asserted until it is handled in software or with the assertion of
RESET#, BINIT, or INIT#.
8.1.28 IGNNE# (I - 1.5 V Tolerant)
The IGNNE# (Ignore Numeric Error) signal is asserted to force the processor to ignore a numeric
error and continue to execute non-control floating-point instructions. If IGNNE# is deasserted, the
processor freezes on a non-control floating-point instruction if a previous instruction caused an
error. IGNNE# has no affect when the NE bit in control register 0 (CR0) is set.
Intel® Pentium® III Processor – Low Power
58 Datasheet
8.1.29 INIT# (I - 1.5 V Tolerant)
The INIT# (Initiali zation) signal is asserted to reset integer registers inside the processor without
affecting the internal (L1 or L2) caches or the floating-point registers. The processor begins
execution at the power-on reset vector configured during power-on configuration. The processor
continues to handle snoop requests during INIT# assertion. INIT# is an asynchronous input.
If INIT# is sampled act ive on RESET#’s active-to-inactive transition, then the processor executes
its built-in self test (BIST).
8.1.30 INTR (I - 1.5 V Tolerant)
The INTR (Interrupt) signal ind icates that an external interrup t has been generated. INTR becomes
the LINT0 signal when the APIC is enabled. The interrupt is maskable using the IF bit in the
EFLAGS register. If the IF bit is set, the processor vectors to the interrupt handler after completing
the current instruction execution. Upon recognizing the interrupt request, the processor issues a
single Interrupt Acknowledge ( INTA) bus transaction. INTR must r e m a in active u ntil the INTA
bus transaction to guaran tee its recognition.
8.1.31 LINT[1:0] (I - 1.5 V Tolerant)
The LINT[1:0] (Local APIC Interrupt) signals must be connected to the appropriate pins/balls of
all APIC bus agents, including the processor and the system logic or I/O APIC component. When
APIC is disabled, the LINT0 signal becomes INTR, a maskable interrupt request signal, and
LINT1 becomes NMI, a non-ma skable interrupt. INTR and NMI ar e backward compatible with the
same signals for the Pentium processor. Both signals are asynchronous inputs.
Both of these signals must be software configured by programming the APIC register space to be
used either as NMI/INTR or LINT[1:0] in the BIOS. If the APIC is enabled at reset, then
LINT[1:0] is the default co nfig uratio n .
8.1.32 LOCK# (I/O - GTL+)
The LOCK# (Lock) signal indicates to the system that a sequence of transactions must occur
atomically. This signal must be connected to the appropriate pins/balls on both agents on the
system bus. For a locked sequence of transactions, LOCK# is asserted from the beginning of the
first transaction th rou gh th e end of the last tr ans actio n.
When the priority agent asserts BPRI# to arbitrate fo r bus own ership, it waits until it observes
LOCK# deasserted. This enables the processor to retain bus ownership throughout the bus locked
operation and guarantee the atomicity of lock.
8.1. 33 NMI (I - 1.5 V Tolerant)
The NMI (Non-Maskable Interrupt) indicates that an external interrupt has been generated. NMI
becomes the LINT1 signal when the APIC is disabled. Asserting NMI causes an interrupt with an
internally supplied vector value of 2 . An external interrupt-acknowledge transaction is not
generated. If NMI is asserted during the execution of an NMI service routine, it remains pending
and is recognized after the IRET is executed by the NMI service routine. At most, one assertion of
NMI is held pendin g. NMI is rising edge sensitive.
Intel® Pentium® III Processor – Low Power
Datasheet 59
8.1.34 PICCLK (I - 2.5 V Tolerant)
The PICCLK (APIC C loc k) s ignal is an input clock to the process or and s ys tem logi c or I/ O AP IC
that is required for operation of the processor, system logic, and I/O APIC components on the
APIC bus.
8.1.35 PICD[1:0] (I/O - 1.5 V Tolerant Open-drain)
The PICD[1:0] (APIC Data) signals are used for bidirectional serial message passing on the APIC
bus. They must be connected to the appropriate pins/balls of all APIC bus agents, including the
processor and the system logic or I/O APIC comp onents. If the PICD0 signal is sampled low on the
active-to-inactive transition of the RE SET# signal, th en the APIC is hard ware disab led .
8.1.36 PLL1, PLL2 (Analog)
The PLL1 and PLL2 signals provide isolated analog decoupling is required for the internal PLL.
See Section 3.2.2 for a description of the analog decoupling circuit.
8.1.37 PRDY# (O - GTL+)
The PRDY# (Probe Ready) signal is a processor output used by debug tools to determine processor
debug readiness.
8.1.38 PREQ# (I - 1.5 V Tolerant)
The PREQ# (Probe Request) signal is used by debug tools to request debug operation of the
processor.
8.1.39 PWRGOOD (I - 2.5 V Tolerant)
PWRGOOD (Power Good) is a 2.5-V tolerant input. The processor requires this signal to be a
clean indication that clocks and the power supplies (VCC, VCCT, etc.) are stable and within their
specifications. Clean implies that the signal will remain low, (capable of sinking leakage current)
and without glitches, from the time that the power supplies are turned on, until they come within
specification. The signal will th en tran sition monotonically to a high (2.5 V) state. Figure 23
illustrates the relationship of PW RGOOD to other system signals. PWRGOOD can be driven
inactive at any time, but clocks and power must again be stable befo re the rising edge of
PWRGOOD. It must also meet the minimum pulse width specified in Table 14 on page 27 and be
followed by a 1 ms RESET# pulse.
Intel® Pentium® III Processor – Low Power
60 Datasheet
The PWRGOOD signal, which must be supplied to the processor , is used to protect internal circuits
against voltage sequencing issues. The PWRGOOD signal should be driven high throughout
boundary scan operation.
8.1.40 REQ[4:0]# (I/O - GTL+)
The REQ[4:0]# (Request Command) signals must be connected to the appropriate pins/balls on
both agents on the s ystem b us. They are as serted b y the current bus owner when it drives A[35 :3]#
to define the currently active transaction type.
8.1.41 RESET# (I - GTL+)
Asserting the RESET# signal resets the processor to a known state and invalidates the L1 and L2
caches without writing back Modified (M state) lines. For a power-on type reset, RESET# must
stay active for at least 1 ms after VCC and BCLK have reached their proper DC and AC
specifications and after PWRGOOD has been asserted. When observing active RESET#, all bus
agents will deassert their outputs within two clocks. RESET# is the only GTL+ signal that does not
have on-die GTL+ termination. A 56.2Ω 1% terminating resistor connected to VCCT is required.
A number of bus signals are sampled at the active-to-inactive transition of RESET# for the power-
on configuration. The configuration options are described in Section 4.0 and in the Pentium® II
Processor Developer’s Manual.
Unless its outputs are three-stated during power-on configuration, after an active-to-inactive
transition o f RE SET#, the pro cessor optionally executes its built- in self-test (BIST) and begins
program execution at reset-vector 000FFFF0H or FFFFFFF0H. RESET# must be connected to the
appropriate pins/balls on both agents on the system bus.
8.1.42 RP# (I/O - GTL+)
The RP# (Request Parity) signal is driven by the request initiator and provides parity protection on
ADS# and REQ[4:0]#. RP# should be connected to the appropriate pins/balls on both agents on the
syste m bus.
A correct parity signal is high if an even number of covered signals are low and low if an odd
number of covered signals are low. This definition allows parity to be high when all covered
signals are high.
Figure 23. PWRGOOD Relationship at Power On
BCLK
PWRGOOD
RESET#
D0026-01
1 msec
VIH25,min
VCC,
VCCT,
VREF
Intel® Pentium® III Processor – Low Power
Datasheet 61
8.1.43 RS[2 :0]# (I - GTL+)
The RS[2:0]# (Respon se Status ) signals are driven by the respon se agent (the agent respons ible for
completion of the current transaction) and must be connected to the appropriate pins/balls on both
agents on the system bus.
8.1.44 RSP# (I - GTL+)
The RSP# (Response Parity) signal is driven by the response agent (the agent responsible for
completion of the current transaction) during assertion of RS[2:0]#. RSP# provid es parity
protection for RS[2:0]#. RSP# should be connected to the appropriate pins/balls on both agents on
the system bus.
A correct parity signal is high if an even number of covered signals are low, and it is low if an odd
number of covered signals are low. During Idle state of RS[2:0]# (RS[2:0]#=000), RSP# is also
high since it is not driven by any agent guaranteeing correct parity.
8.1.45 RSVD (TBD)
The RSVD (Reserved) signal is currently unimplemented bu t is reserved for fu ture us e. Leave this
signal unconnected. Intel recommends that a routing channel for this signal be allocated.
8.1.46 RTTIMPEDP (Analog)
The RTTIMPEDP (RTT Impedance/PMOS) signal is used to configure the on-die GTL+
termination. Connect the RTTIMPEDP signal to VSS with a 56.2-Ω, 1% resistor.
8.1.47 SLP# (I - 1.5 V Tolerant)
The SLP# (Sleep) signal, when asserted in the Stop Grant state, causes the processor to enter the
Sleep state. During the Sleep state, the processor stops pro viding internal clock signals to all units,
leaving only the Phase-Locked Loop (PLL) still ru nnin g. The processo r will not recognize snoop
and interrupts in the Sleep state. The processor will only recognize changes in the SLP#, STPCLK#
and RESET# signals while in the Sleep state. If SLP# is deasserted, the processor exits Sleep state
and returns to the Stop Grant state in which it restarts its internal clock to th e bus and APIC
processor units.
8.1.48 SMI# (I - 1.5 V Tolerant)
The SMI# (System Management In terrupt) is asserted asynchronously by system logic. On
accepting a System Management Interrupt, the processor saves the curr ent state and enters System
Management Mode (SMM). An SMI Acknowledge transaction is issued, and the processor begins
program execution from the SMM handler.
8.1.49 STPCLK# (I - 1.5 V Tolerant)
The STPCLK# (Sto p C l ock) signal, when as serted, caus es the p rocess or to enter a low-power Stop
Grant state. The processor issues a Stop Grant Acknowledge special transaction and stops
providing internal clock signals to all units except the bus and APIC units. The processor continues
Intel® Pentium® III Processor – Low Power
62 Datasheet
to snoop bus transactions and service interrupts while in the Stop Grant state. When STPCLK# is
deasserted, the processor restarts its internal clock to all units and resumes execution. The assertion
of STPCLK# has no affect on the bus clock.
8.1.50 TCK (I - 1.5 V Tolerant)
The TCK (Test Clock ) signal provides the clock input for the test bus (also kn own as the test access
port).
8.1.51 TDI (I - 1.5 V Tolerant)
The TDI (Test Data In) signal transfers serial test data to the processor. TDI provides the serial
input needed for JTAG support.
8.1.52 TDO (O - 1.5 V Tolerant Open-drain)
The TDO (Test Data Out) signal transfers serial test data from the processor. TDO provides the
serial output needed for JTAG support.
8.1.53 TESTHI (I - 1.5 V Tolerant)
The TESTHI (Test input High) is used during processor test and needs to be pulled high during
normal operation.
8.1.54 TESTLO[2:1] (I - 1.5 V Tole rant)
The TESTLO[2:1] (Test input Low) signals are used during processor test an d needs to be pull ed to
ground during normal operation.
8.1.55 THERMDA, THERMDC (A nalog)
The THERMDA (Thermal Diode Anode) and THERMDC (Thermal Diode Cathode) signals
connect to the anode and cathode of the on-die thermal diode.
8.1.56 TMS (I - 1.5 V Tolerant)
The TMS (Test Mode Select) signal is a JTAG support signal used by debug tools.
8.1.57 TRDY# (I - GTL+)
The TRDY# (Target Ready) signal is asserted by the target to indicate that the target is ready to
receive write or implicit write-back data transfer. TRDY# must be connected to the appropriate
pins/balls on both agents on the system bus.
Intel® Pentium® III Processor – Low Power
Datasheet 63
8.1.58 TRST# (I - 1.5 V Tolerant)
The TRST# (Test Reset) signal resets the Test Access Port (TAP) logic. The Pentium III Processor
– Low Power do not self-reset during power on; therefore, it is necessary to drive this signal low
during power-on reset.
8.1.59 VID[4:0] (O – Open-drain)
The VID[4:0] (Voltage ID) pins/balls can be used to support automatic selection of power supply
voltages. These pins/balls are not signals, they are either an open circuit or a short to VSS on the
processor substrate. The combination of opens and shorts encodes the voltage required by the
processor. External to pull-ups are required to sense the encoded VID. For processors that have
Intel SpeedS tep technology en abled, VID[4:0] encode the vo ltage required in the battery-optimized
mode. VID[4:0] are needed to cleanly support voltage specification changes on Pentium III
Processor – Low Power. The voltage encoded by VID[4:0] is defined in Table 33. A “1” in this
table refers to an open pin/ball and a “0” refers to a short to VSS. The power supply must provide
the requested voltage or disable itself.
Please note that in order to implement VID on the BGA2 package, some VID[4:0] balls may be
depopulated. For the BGA2 package, a “1” in Table 33 implies that the co rresponding VID ball is
depopulated, while a “0” implies that the corresponding VI D ball is not depopulated.
8.1.60 VREF (Analog)
The VREF (GTL+ Reference Voltage) signal provides a DC level reference voltage for the GTL+
input buffers. A voltage divider should be used to divide VCCT by 2/3. Resistor values of 1.00 KΩ
and 2.00 KΩ are recommended. Decouple the VREF signal with three 0.1-µF high frequency
capacitors close to the processor.
8.2 Signal Summaries
Table 34 through Table 37 list the attributes of the processor input, output, and I/O signals.
Table 33. Voltage Identification Encoding
VID[4:0] VCC VID[4:0] VCC VID[4:0] VCC VID[4:0] VCC
00000 2.00 01000 1.60 10000 1.275 11000 1.075
00001 1.95 01001 1.55 10001 1.250 11001 1.050
00010 1.90 01010 1.50 10010 1.225 11010 1.025
00011 1.85 01011 1.45 10011 1.200 11011 1.000
00100 1.80 01100 1.40 10100 1.175 11100 0.975
00101 1.75 01101 1.35 10101 1.150 11101 0.950
00110 1.70 01110 1.30 10110 1.125 11110 0.925
00111 1.65 01111 No CPU 10111 1.100 11111 No CPU
Intel® Pentium® III Processor – Low Power
64 Datasheet
Table 34. Input Signals
Name Active Level Clock Signal Group Qualified
A20M# Low Asynch CMOS Always
BCLK High —System Bus Always
BPRI# Low BCLK System Bus Always
BSEL[1:0] High Asynch Implementation Always
DEFER# Low BCLK System Bus Always
FLUSH# Low Asynch CMOS Always
IGNNE# Low Asynch CMOS Always
INIT# Low Asynch System Bus Always
INTR High Asynch CMOS APIC disabled
mode
LINT[1:0] High Asynch APIC APIC enabled
mode
NMI High Asynch CMOS APIC disabled
mode
PICCLK High —APIC Always
PREQ# Low Asynch Implementation Always
PWRGOOD High Asynch Implementation Always
RESET# Low BCLK System Bus Always
RS[2:0]# Low BCLK System Bus Always
RSP# Low BCLK System Bus Always
SLP# Low Asynch Implementation Stop Grant st ate
SMI# Low Asynch CMOS Always
STPCLK# Low Asynch Implementation Always
TCK High —JTAG
TDI TCK JTAG
TMS TCK JTAG
TRDY# Low BCLK System Bus Response phase
TRST# Low Asynch JTAG
Intel® Pentium® III Processor – Low Power
Datasheet 65
Table 35. Output Signals
Name Active Level Clock Signal Group
FERR# Low Asynch Open-drain
IERR# Low Asynch Open-drain
PRDY# Low BCLK Implementation
TDO High TCK JTAG
VID[4:0] High Asynch Implementation
Table 36. Input/Output Signals (Single Driver)
Name Active Level Clock Signal Group Qualified
A[35:3]# Low BCLK System Bus ADS#, ADS#+1
ADS# Low BCLK System Bu s Alway s
AP[1:0]# Low BCLK System Bus ADS#, AD S#+1
BREQ0# Low BCLK System Bus Always
BP[3:2]# Low BCLK System Bus Always
BPM[1:0]# Low BCLK System Bus Always
D[63:0]# Low BCLK System Bus DRDY#
DBSY# Low BCLK System Bu s Alway s
DEP[7:0]# Low BCLK System Bus DRDY#
DRDY# Low BCLK System Bus Always
LOCK# Low BCLK System Bus Always
REQ[4:0]# Low BCLK System Bus ADS#, ADS#+1
RP# Low BCLK System Bus ADS#, ADS#+1
Table 37. Input/Output Signals (Multiple Driver)
Name Active Level Clock Signal Group Qualified
AERR# Low BCLK System Bus ADS#+3
BERR # Low BCLK System Bus Alway s
BINI T# Low BCLK System Bus Always
BNR# Low BCLK System Bus Always
HIT# Low BCLK System Bus Always
HITM# Low BCLK System Bus Always
PICD[1:0] High PICCLK APIC Always
Intel® Pentium® III Processor – Low Power
66 Datasheet
9.0 PLL RLC Filter Specification
9.1 Introduction
The Pentium III Processor – Low Power processor has an internal PLL clock generator, which are
analog in nature and requir e quiet p ower supplies for minimum jitter. Jitter is detrimental to a
system; it degrades external I /O timings as well as internal core timing s (i.e., maximu m frequency).
In mobile Pentium II processors, the power supply filter was specified as an external LC network.
This remains largely the same for the Pen tium III Processor – Low Power. Ho wever, due to
increased current flow, the value of the inductor has to be reduced, thereby requiring new
components. The general desired topology is shown in Figure 5. Excluded from the external
circuitry are parasitics associated with each component.
9.2 Filter Specification
The function of the filter is two f old. It protects the PLL from external noise through low-pass
attenuation. It also protects the PLL from internal noise through high-pass filter ing. In general, the
low-pass descrip tion forms an adequate description for the filter.
The AC low-pass specification, with input at VCCT and output measured across the capacitor, is as
follows:
•< 0.2 dB gain in pass band
•< 0.5 dB attenuation in pass band < 1 Hz (see DC drop in next set of requirements)
•34 dB attenuation from 1 MHz to 66 MHz
•28 dB attenuation from 66 MHz to core frequency
•The filter specification (AC) is graphically shown in Figure 24.
•Other requirements:
•Use a shielded type inductor to minimize magnetic pickup
•The filter should support a DC current of at least 30 mA
•The DC voltage drop from VCCT to PLL1 should be less than 60 mV, which in practice
implies series resistance of less than 2 Ω. This also means that the pass ban d (fr om DC to 1Hz)
attenuation below 0.5 dB is for VCCT = 1.1 V and below 0.35 dB for VCCT = 1.5 V.
Intel® Pentium® III Processor – Low Power
Datasheet 67
9.3 Recommendation for Low Power Systems
The following LC components are recommended. The tables will be updated as other suitable
components and specifications are identified.
Figure 24. PLL Filter Specifications
NOTES:
Diagram is not to scale
No specification for frequencies beyond fcore
Fpeak, if existent, should be less than 0.05 MHz
0 dB
-28 dB
-34 dB
0.2 dB
forbidden
zone
x dB
forbidden
zone
1 MHz 66 MHz fcorefpeak1 HzDC
passband high fre q uen c y
band
x = 20.log[(Vcct-60 mV)/Vcct]
Table 38. PLL Filter Inductor Recommendations
Inductor Part Number Value Tol SRF Rated
IDCR Min Damping
R needed
L1 TDK MLF2012A4R7KT 4.7 µH10% 35 MHz 30 mA 0.56Ω (1Ω max) 0Ω
L2 Murata LQG21N4R7K10 4.7 µH10% 47 MHz 30 mA 0.7Ω (+/-50%) 0Ω
L3 Murata LQG21C4R7N00 4.7 µH30% 35 MHz 30 mA 0.3Ω max 0.2Ω
(assumed)
NOTE: Minimum damping resistance is calculated from 0.35Ω – DCRmin. From vendor provided data, L1 and
L2 DCRmin is 0.4 Ω and 0.5 Ω respectively, qualifying them for zero required trace resistance. DCRmin
for L3 is not known and is assumed to be 0.15 Ω. There may be other vendors who might provide
parts of equivalent characteristics and the OEMs should consider doing their own testing for selecting
their own vendors.
Intel® Pentium® III Processor – Low Power
68 Datasheet
To satisfy damp ing requ irements , total s eries resi stance in the f ilter (fr om V CCT to th e t op pl ate of
the capacitor) must be at least 0.35Ω. This resistor can be in the form of a discrete component, or
routing, or both. For example, if the picked inductor has minimum DCR of 0.25Ω, then a routing
resistance of at least 0.10Ω is requ ired. Be careful not to exceed the maximum resistance rule (2Ω).
For exampl e, if usi ng discr ete R1, the maxi mum DCR of the L sh ould be less t han 2.0 - 1. 1 = 0.9 Ω,
which precludes using L2 and possibly L1.
Other routing requirements:
•The capacitor should b e close to the PLL1 and PLL2 pins, with less than 0 .1Ω per ro ute (These
routes do not count towards the minimum damping resistance requirement).
•The PLL2 route should be parallel and next to the PLL1 route (minimize loop area).
•The inductor should be close to the capacitor; any routing resistance should be inserted
between VCCT and the inductor.
•Any discrete resisto r should be inserted between VCCT and the induc tor.
9.4 Comments
•A magnetically shielded inductor protects the circuit from picking up external flux noise. This
should provide better timing margins than with an unshielded induc tor.
•A discrete or routed resistor is requ ired b ecaus e the LC filter by nature has an under-damped
response, which can cause resonance at the LC pole. Noise amplification at this band, although
not in the PLL-sensitive spectrum, could cause a fatal headroom reduction for analog circuitry .
The resistor serves to dampen the response. Systems with tight space constraints should
consider a discrete resistor to provide the required dam ping resistance. Too lar ge of a damping
resistance can cause a large IR drop, which means less analog headroom and lower frequency.
•Ceramic capacitors have very high self-resonance frequencies, but they are not available in
larg e capacitan ce valu es. A h igh self-res onant fr equenc y coup led wit h low E SL/ESR is cruc ial
for sufficient rejection in the PLL and high frequency band. The recommended tantalum
capacitors have acceptably low ESR and ESL.
•The capacitor must be close to the PLL1 and PLL2 pins, otherwise the value of the low ESR
tantalum capacitor is wasted. Note the distance constraint should be translated from the 0.1-Ω
requirement.
The mobile Pentium II processor LC filter cannot be used with the Pentium III Processor – Low
Power. The larger inductor of the old LC filter imposes a lower current rating. Due to increased
current requirements for the Pentium III Proces sor – Low Power, a lower value inductor is required.
Table 39. PLL Filter Capacitor Recommendations
Capacitor Part Number Value Tolerance ESL E SR
C1 Kem et T495D336M 016AS 33 µF20% 2.5 nH 0.225Ω
C2 AV X TPSD3 36M020S0200 33 µF20% unknown 0.2Ω
NOTE: There may be other vendors who might provide parts of equivalent characteristics and the OEMs
should consider doing their own testing for selecting their own vendors.
Table 40. PLL Filter Resistor Recommendations
Resistor Part Number Value Tolerance Power
R1 various 1Ω10% 1/16W
