1
Precision Edge®
SY58029U
Micrel, Inc.
M9999-082707
hbwhelp@micrel.com or (408) 955-1690
DESCRIPTION
Selects 1 of 4 differential inputs
Provides two copies of the selected input
Guaranteed AC performance over temperature and
voltage:
• DC-to-> 5Gbps data rate throughput
• < 390ps IN-to-Out tpd
• < 110ps tr/t
f times
Ultra low-jitter design:
• < 10psPP total jitter (clock)
• < 1psRMS random jitter
• < 10psPP deterministic jitter
• < 0.7psRMS crosstalk-induced jitter
Unique patended input design minimizes crosstalk
Accepts an input signal as low as 100mV
Unique patented input termination and VT pin
accepts DC- and AC-coupled inputs (CML, LVPECL,
LVDS)
800mV 100K LVPECL output swing
Power supply 2.5V ±5% or 3.3V ±10%
–40°C to +85°C temperature range
Available in 32-pin (5mm ∞∞
∞∞
∞ 5mm) MLF® package
FEATURES
ULTRA PRECISION DIFFERENTIAL
LVPECL 4:1 MUX with 1:2 FANOUT
and INTERNAL TERMINATION
Precision Edge®
SY58029U
APPLICATIONS
Redundant clock and/or distribution
All SONET/SDH clock/data distribution
Loopback
All Fibre Channel distribution
All Gigabit Ethernet clock and/or data distribution
Rev.: D Amendment: /0
Issue Date: August 2007
The SY58029U is a 2.5V/3.3V precision, high-speed, 4:1
differential multiplexer with 100k LVPECL (800mV)
compatible outputs, capable of handling clocks up to 4GHz
and data streams up to 5Gbps. In addition, a 1:2 fanout
buffer provides two copies of the selected inputs.
The differential input includes Micrel’s unique, 3-pin input
termination architecture that allows customers to interface
to any differential signal (AC- or DC-coupled) as small as
100mV without any level shifting or termination resistor
networks in the signal path. The result is a clean, stub-free,
low-jitter interface solution. The outputs are 800mV LVPECL,
(100k temperature compensated) with extremely fast rise/
fall times guaranteed to be less than 110ps.
The SY58029U operates from a 2.5V ±5% supply or a
3.3V ±10% supply and is guaranteed over the full industrial
temperature range of –40°C to +85°C. For applications that
require CML outputs, consider the SY58028U. For 400mV
LVPECL outputs, consider the SY58030U. The SY58029U
is part of Micrel’s high-speed, Precision Edge® product line.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
TYPICAL PERFORMANCE
Precision Edge is a registered trademark of Micrel, Inc.
MicroLeadFrame and MLF are registered trademarks of Amkor Technology, Inc.
Precision Edge®
FUNCTIONAL BLOCK DIAGRAM
IN0
/IN0
VT0
50Ω
50Ω
IN1
/IN1
VT1
50Ω
50Ω
Q
0
/Q
0
0
1
MUX
4:1
MUX
1:2
Fanout
V
REF-AC0
IN2
/IN2
VT2
50Ω
50Ω
V
REF-AC2
V
REF-AC1
2
IN3
/IN3
VT3
50Ω
50Ω
V
REF-AC3
3
SEL0 (CMOS/TTL)
SEL1 (CMOS/TTL)
Q
1
/Q
1
TIME (100ps/div.)
Output Swing
(200mV/div.)
2
Precision Edge®
SY58029U
Micrel, Inc.
M9999-082707
hbwhelp@micrel.com or (408) 955-1690
PACKAGE/ORDERING INFORMATION
24
23
22
21
20
19
18
17
GND
VCC
Q1
/Q1
VCC
NC
SEL1
VCC
IN0
VT0
VREF-AC0
/IN0
IN1
VT1
VREF-AC1
/IN1
1
2
3
4
5
6
7
8910111213141516
32 31 30 29 28 27 26 25
/IN2
IN3
VT3
VREF-AC3
/IN3
VREF-AC2
VT2
IN2
VCC
Q0
/Q0
VCC
GND
NC
SEL0
VCC
32-Pin MLF® (MLF-32)
Pin Number Pin Name Pin Function
1, 4 IN0, /IN0 Differential Input: Each pair accepts AC- or DC-coupled signals as small as 100mV.
5, 8 IN1, /IN1 Each pin of a pair internally terminates to a VT pin through 50ý. Note that these
25, 28 IN2, /IN2 inputs will default to an indeterminate state if left open. If an input is not used, connect one
29, 32 IN3, /IN3 end of the differential pairs to ground through a 1ký resistor, and leave the other end to
VCC through a 825ý resistor. Unused VT and VREF-AC pins may also be left floating.
Please refer to the “Input Interface Applications” section for more details.
2, 6, 26, 30 VT0, VT1 Input Termination Center-Tap: Each side of the differential input pair terminates to a V T
VT2, VT3 pin. The VT pin provides a center-tap to the termination network for maximum
interface flexibility. See “Input Interface Applications” section for more details.
15, 18 SEL0, SEL1 This Single-Ended TTL/CMOS compatible input selects the inputs to the multiplexer. Note
that this input is internally connected to a 25ký pull-up resistor and will default to a logic
HIGH state if left open. Input logic threshold is VCC/2. See “Truth Table” for select control.
14, 19 NC No Connect.
10, 13, 16 VCC Positive Power Supply: Bypass with 0.1µF™ℑ0.01µF low ESR capacitors.
17, 20, 23
11, 12 /Q0, Q0 Differential Outputs: These 100k compatible (internally temperature compensated)
21, 22 /Q1, Q1 LVPECL output pairs are copies of the selected input. Unused output pins may be left
floating. See “Output Interface” for terminating guidelines.
9, 24 GND, Ground. Ground pin and exposed pad must be connected to the same ground plane.
Exposed Pad
3, 7, 27, 31 VREF-AC0 Reference Voltage: This reference output is equivalent to VCC–1.4V. It is used for
VREF-AC1 AC-coupled inputs. When interfacing to AC input signals, connect VREF-AC directly to the
VREF-AC2 VT pin and bypass with 0.01µF low ESR capacitor to VCC. See “Input Interface Applica-
VREF-AC3 tions” section. Maximum sink/source current is 0.5mA.
PIN DESCRIPTION
TRUTH TABLE
SEL1 SEL0
0 0 IN0 Input Selected
0 1 IN1 Input Selected
1 0 IN2 Input Selected
1 1 IN3 Input Selected
Ordering Information(1)
Package Operating Package Lead
Part Number Type Range Marking Finish
SY58029UMI MLF-32 Industrial SY58029U Sn-Pb
SY58029UMITR(2) MLF-32 Industrial SY58029U Sn-Pb
SY58029UMG(3) MLF-32 Industrial SY58029U with Pb-Free
Pb-Free bar-line indicator NiPdAu
SY58029UMGTR(2, 3) MLF-32 Industrial SY58029U with Pb-Free
Pb-Free bar-line indicator NiPdAu
Notes:
1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC electricals only.
2. Tape and Reel.
3. Pb-Free package recommended for new designs.
3
Precision Edge®
SY58029U
Micrel, Inc.
M9999-082707
hbwhelp@micrel.com or (408) 955-1690
Absolute Maximum Ratings(1)
Power Supply Voltage (VCC ) ......................–0.5V to +4.0V
Input Voltage (VIN) .......................................... –0.5V to VCC
LVPECL Output Current (IOUT)
Continuous..............................................................50mA
Surge ....................................................................100mA
Termination Current(3)
Source or sink current on VT pin.........................±100mA
Input Current
Source or sink current on IN, /IN pin ....................±50mA
Lead Temperature (soldering, 20 sec.) ..................... 260°C
Storage Temperature Range (TS ) ...........–65°C to +150°C
Operating Ratings(2)
Power Supply Voltage (VCC) ...............+2.375V to +2.625V
.............................................................+3.0V to +3.6V
Ambient Temperature Range (TA)..............–40°C to +85°C
Package Thermal Resistance(4)
MLF® (θJA)
Still-Air............................................................. 50°C/W
MLF® (ψJB)
Junction-to-Board............................................ 20°C/W
TA= –40°C to +85°C, unless otherwise stated.
Symbol Parameter Condition Min Typ Max Units
VCC Power Supply Voltage VCC = 2.5V 2.375 2.5 2.625 V
VCC = 3.3V 3 . 0 3. 3 3. 6 V
ICC Power Supply Current No load, max. VCC 110 140 mA
RDIFF_IN Differential Input Resistance
(IN-to-/IN)
80 100 120 ý
RIN Input Resistance
(IN-to-/IN, /IN-to-V
T
)
40 50 60 ý
VIH Input HIGH Voltage
(IN-to-/IN)
Note 6 VCC–1.6 VCC V
VIL Input LOW Voltage
(IN-to-/IN)
0V
IH–0.1 V
VIN Input Voltage Swing
(IN-to-/IN)
See Figure 1a. 0.1 1.7 V
VDIFF_IN Differential Input Voltage Swing
(IN-to-/IN)
See Figure 1b. 0.2 V
VT IN Max Input Voltage (IN-to-VT)1.28 V
VREF-AC Reference Voltage VCC–1.3
V
CC
–1.2
VCC–1.1 V
Notes:
1. Permanent device damage may occur if ratings in the “Absolute Maximum Ratings” section are exceeded. This is a stress rating only and functional
operation is not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum ratings
conditions for extended periods may affect device reliability.
2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings.
3. Due to the limited drive capability, use for input of the same package only.
4. Thermal performance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential (GND) on the PCB. ψJB uses 4-layer
θJA in still air number unless otherwise stated.
5. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
6. VIH (min) not lower than 1.2V.
DC ELECTRICAL CHARACTERISTICS(5)
4
Precision Edge®
SY58029U
Micrel, Inc.
M9999-082707
hbwhelp@micrel.com or (408) 955-1690
VCC = 2.5V ±5% or 3.3V ±10%; TA= –40°C to +85°C; RL = 50ý to VCC –2V across each output pair, unless otherwise stated.
Symbol Parameter Condition Min Typ Max Units
VOH Output HIGH Voltage VCC–1.145 VCC–0.895 V
VOL Output LOW Voltage VCC–1.945 VCC–1.695 V
VOUT Output Voltage Swing See Figure 1a. 550 800 mV
VDIFF_OUT Differential Output Voltage Swing See Figure 1b. 1100 1600 mV
LVPECL OUTPUT DC ELECTRICAL CHARACTERISTICS(7)
VCC = 2.5V ±5% or 3.3V ±10%; TA= –40°C to +85°C, unless otherwise stated.
Symbol Parameter Condition Min Typ Max Units
VIH Input HIGH Voltage SEL0, SEL1 2.0 V
VIL Input LOW Voltage SEL0, SEL1 0.8 V
IIH Input HIGH Current 40 µA
IIL Input LOW Current –300 µA
Note:
7. The circuit is designed to meet the DC specifications shown in the above table after thermal equilibrium has been established.
LVTTL/CMOS DC ELECTRICAL CHARACTERISTICS(7)
5
Precision Edge®
SY58029U
Micrel, Inc.
M9999-082707
hbwhelp@micrel.com or (408) 955-1690
VCC = 2.5V ±5% or 3.3V ±10%; RL = 50ý to VCC–2V; TA= –40°C to +85°C, VIN ž 100mV, unless otherwise stated.
Symbol Parameter Condition Min Typ Max Units
fMAX Maximum Operating Frequency NRZ Data 5 Gbps
VOUT ž 400mV Clock 4 GHz
tpd Propagation Delay (Diff) (IN-to-Q) VIN ž 100mV 215 390 ps
(SEL-to-Q) 100 500 ps
tpd Tempco D iff ere nti al P ro pag ati on D elay 115 fs/°C
Temperature Coefficient
tSKEW Output-to-Output Note 9 715ps
Part-to-Part Note 10 100 ps
tJITTER Data Random Jitter Note 11 2.5Gbps to 3.2Gbps 1 p s RMS
Deterministic Jitter Note 12 2.5Gbps to 3.2Gbps 10 ps PP
Clock Cycle-to-Cycle Jitter Note 13 1ps
RMS
Total Jitter Note 14 10 psPP
Crosstalk Induced Jitter Note 15 0.7 psRMS
(Adjacent Channel)
tr, tfOutput Rise/Fall Time 20% to 80%, V IN = 800mV, full output swing 35 60 110 ps
Notes:
8. High frequency AC electricals are guaranteed by design and characterization.
9. Output-to-output skew is measured between outputs under identical input conditions.
10. Part-to-part skew is defined for two parts with identical power supply voltages at the same temperature and with no skew of the edges at the
respective inputs.
11. Random jitter is measured with a K28.7 comma detect character pattern, measured at 2.5Gbps to 3.2Gbps.
12. Deterministic jitter is measured at 2.5Gbps to 3.2Gbps, with both K28.5 and 223–1 PRBS pattern.
13. Cycle-to-cycle jitter definition: the variation of periods between adjacent cycles, Tn–Tn–1 where T is the time between rising edges of the output
signal.
14. Total jitter definition: with an ideal clock input of frequency - fMAX, no more than one output edge in 1012 output edges will deviate by more than the
specified peak-to-peak jitter value.
15. Crosstalk is measured at the output while applying two similar clock frequencies that are asynchronous with respect to each other at the inputs.
AC ELECTRICAL CHARACTERISTICS(8)
SINGLE-ENDED AND DIFFERENTIAL SWINGS
V
IN
,
V
OUT
800mV (Typ
.)
Figure 1a. Single-Ended Voltage Swing
V
DIFF_IN
,
V
DIFF_OUT
1.6V (Typ
.)
Figure 1b. Differential Voltage Swing
6
Precision Edge®
SY58029U
Micrel, Inc.
M9999-082707
hbwhelp@micrel.com or (408) 955-1690
TIMING DIAGRAMS
IN
/
IN
Q
/Q
t
pd
t
pd
V
IN
V
OU
T
Figure 2a. IN-to-Q Timing Diagram
S
EL
Q
/Q
tpd tpd
VOU
T
VCC/2 VCC/2
Figure 2b. SEL-to-Q Timing Diagram
SEL0 Q: SEL1 = LOW; IN0, /IN1 = LOW; /IN0, IN1 = HIGH
or: SEL1 = HIGH; IN2, /IN3 = LOW; /IN2, IN3 = HIGH
SEL1 Q: SEL0 = LOW; IN0, /IN2 = LOW; /IN0, IN2 = HIGH
or: SEL0 = HIGH; IN1, /IN3 = LOW; /IN1, IN3 = HIGH
7
Precision Edge®
SY58029U
Micrel, Inc.
M9999-082707
hbwhelp@micrel.com or (408) 955-1690
FUNCTIONAL CHARACTERISTICS
VCC = 2.5V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated.
2.5GHz Output
Output Swing
(200mV/div.)
TIME (50ps/div.)
200MHz Output
Output Swing
(200mV/div.)
TIME (600ps/div.)
1.25GHz Output
Output Swing
(200mV/div.)
TIME (100ps/div.)
5Gbps Output (2
23
—
1 PRBS)
TIME (50ps/div.)
Output Swing
(200mV/div.)
1.25Gbps Output (223
—
1 PRBS)
TIME (200ps/div.)
Output Swing
(200mV/div.)
3.2Gbps Output (2
23
–1 PRBS)
TIME (100ps/div.)
Output Swing
(200mV/div.)
8
Precision Edge®
SY58029U
Micrel, Inc.
M9999-082707
hbwhelp@micrel.com or (408) 955-1690
TYPICAL OPERATING CHARACTERISTICS
VCC = 2.5V, GND = 0, VIN = 100mV, TA = 25°C, unless otherwise stated.
0
0.2
0.4
0.6
0.8
1
1.2
1.4
-40 -20 0 20 40 60 80 100
∆ OUTPUT-to-OUTPUT SKEW (ps)
TEMPERATURE (°C)
Output-to-Output Skew
vs. Temperature
280
285
290
295
300
305
310
315
320
0 200 400 600 800 1000 1200
PROPAGATION DELAY (ps)
INPUT VOLTAGE (mV)
Propagation Delay
vs. Input Voltage
296
298
300
302
304
306
308
310
-60 -40 -20 0 20 40 60 80 100
PROPAGATION DELAY (ps)
TEMPERATURE (°C)
Propagation Delay
vs. Temperature
0
100
200
300
400
500
600
700
800
012345678910
OUTPUT AMPLITUDE (mV)
FREQUENCY (GHz)
Output Amplitude
vs. Frequency
9
Precision Edge®
SY58029U
Micrel, Inc.
M9999-082707
hbwhelp@micrel.com or (408) 955-1690
INPUT STAGE
50Ω
50Ω
V
CC
GND
/
IN
V
T
IN
Figure 3. Simplified Differential Input Stage
INPUT INTERFACE APPLICATIONS
PECL
IN
/IN
V
T
SY58029
U
V
CC
R
pd
R
pd
F
or a 3.3V system, R
pd
= 100Ω
F
or a 2.5V system, R
pd
= 50Ω
GND
GND
V
REF-AC
V
CC
0.01µF
Figure 4d. LVPECL
Interface (AC-coupled)
LVDS IN
/IN
V
T
NC
SY58029
U
V
CC
G
ND NC V
REF-AC
Figure 4e. LVDS Interface
CML IN
/IN
V
T
NC
SY58029
U
V
CC
G
ND NC V
REF-AC
Figure 4a. CML
Interface (DC-coupled)
Option: May connect V T to VCC
LVPECL
IN
/IN
V
T
SY58029
U
V
CC
V
CC
NC
0.01µFR
pd
For a 3.3V system, R
pd
= 50Ω
For a 2.5V system, R
pd
= 19Ω
G
ND V
REF-AC
Figure 4c. PECL
Interface (DC-coupled)
CML IN
/IN
V
T
SY58029
U
V
CC
G
ND V
REF-AC
V
CC
0.01µF
Figure 4b. CML
Interface (AC-coupled)
10
Precision Edge®
SY58029U
Micrel, Inc.
M9999-082707
hbwhelp@micrel.com or (408) 955-1690
OUTPUT INTERFACE APPLICATIONS
R2
82Ω
R2
82Ω
Z
O
= 50Ω
Z
O
= 50Ω
+3.3V +3.3V
R1
130ΩR1
130Ω
+3.3V
Figure 5a. Parallel Thevenin-Equivalent
Termination
Z = 50Ω
Z = 50Ω
50Ω50Ω
50Ω
+3.3V +3.3V
destination
RbC1
0.01µF
(optional)
V
CC
Figure 5b. Parallel Termination
(Three-Resistor "Y")
Note:
1. For a 2.5V system, R1 = 250ý, R2 = 62.5ý.
For a 3.3V system, R1 = 130ý, R2 = 82ý.
Note:
1. For a 2.5V system, Rb = 19ý.
For a 3.3V system, Rb = 50ý.
Part Number Function Data Sheet Link
SY58028U Ultra Precision Differential CML 4:1 MUX http://www.micrel.com/product-info/products/sy58028u.shtml
with 1:2 Fanout and Internal I/O Termination
SY58029U Ultra Precision Differential LVPECL 4:1 MUX http://www.micrel.com/product-info/products/sy58029u.shtml
with 1:2 Fanout and Internal Termination
SY58030U Ultra Precision, 400mV Differential LVPECL 4:1 http://www.micrel.com/product-info/products/sy58030u.shtml
MUX with 1:2 Fanout and Internal Termination
MLF® Application Note www.amkor.com/products/notes_papers/MLF_AppNote_0902.pdf
HBW Solutions New Products and Applications www.micrel.com/product-info/products/solutions.shtml
RELATED MICREL PRODUCTS AND SUPPORT DOCUMENTATION
11
Precision Edge®
SY58029U
Micrel, Inc.
M9999-082707
hbwhelp@micrel.com or (408) 955-1690
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s
use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2005 Micrel, Incorporated.
32-PIN MicroLeadFrame® (MLF-32)
Package
EP- Exposed Pa
d
Die
CompSide Island
Heat Dissipation
Heavy Copper Plane
Heavy Copper Plane
V
EE
V
EE
Heat Dissipation
PCB Thermal Consideration for 32-Pin MLF® Package
(Always solder, or equivalent, the exposed pad to the PCB)
Package Notes:
1. Package meets Level 2 qualification.
2. All parts are dry-packaged before shipment.
3. Exposed pads must be soldered to a ground for proper thermal management.
