μP Supervisor Circuits
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PT7M7803/7809-7812/7823-7825
Features
Precision supply-voltage monitor
- 4.63V (PT7M78xxL)
- 4.38V (PT7M78xxM)
- 3.08V (PT7M78xxT)
- 2.93V (PT7M78xxS)
- 2.63V (PT7M78xxR)
- 2.32V (PT7M78xxZ)
- 2.20V (PT7M78xxY)
- 4.00V (PT7M78xxJ)
- 2.25V (PT7M78xxK)
- 2.80V (PT7M78xxG)
200ms reset pulse width
Debounced CMOS-compatible manual-reset input
(7811, 7812, 7823, 7825)
Reset Output Signal for Watchdog and Power
Abnormal, Manual Reset
Reset Push-Pull output (PT7M7809,7811,7823,
7824,7825)
Reset Open-Drain output (PT7M7803)
Voltage monitor for power-fail or low battery
warning
Guaranteed RESET/RESET valid at VCC=1.0V
Description
The PT7M78xx family microprocessor (P) supervisory
circuits are targeted to improve reliability and accuracy
of power-supply circuitry in P systems. These devices
reduce the complexity and number of components
required to monitor power-supply and battery functions.
The main functions are:
1. Asserting reset output during power-up, power-
down and brownout conditions for P system.
2. Watchdog functions
3. Manual reset.
Applications
Power-supply circuitry in P systems
Networking
Security System
Server/Storage
Embedded System
Function Comparison Table
Part No.
RESET output
RESET output
(push-pull)
Manual Reset
Input
Watchdog
Input
Push-Pull
1
PT7M7803
-
-
-
-
2
PT7M7809
-
-
-
3
PT7M7810
-
-
-
4
PT7M7811
-
-
5
PT7M7812
-
-
6
PT7M7823
-
7
PT7M7824
-
8
PT7M7825
-
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PT7M7803/7809-7812/7823-7825
Pin Configuration
Pin Description
5
4
1
3
V
CC
RESET
GND
MR
SOT23-5
1
2
3
3
1
2
2
1
5
4
1
2
3
1
2
V
CC
GND
RESET
3
V
CC
GND
RESET
V
CC
RESET
GND
MR
WDI
V
CC
GND
WDI
V
CC
RESET
GND
RESET
3
4
5
4
5
SOT23-3/SC70-3
5
4
1
3
V
CC
GND
MR
RESET
RESET
PT7M7803
PT7M7809
PT7M7810
PT7M7811
PT7M7812
PT7M7823
PT7M7824
RESET
MR
PT7M7825
2
NC
2
NC
4
3
1
2
V
CC
RESET
GND
MR
4
3
1
2
V
CC
GND
MR
RESET
PT7M7811
PT7M7812
SOT143-4
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Pin
Type
Description
MR
I
Manual-Reset: (CMOS). Active low. Pull low to force a reset. Reset remains asserted for the duration of
the Reset Timeout Period after MR transitions from low to high. Leave unconnected or connected to VCC if
not used.
VCC
Power
Supply Voltage. Reset is asserted when VCC drops below the Reset Threshold Voltage (VRST). Reset
remains asserted until VCC rises above VRST and keep asserted for the duration of the Reset Timeout Period
(tRS) once VCC rises above VRST.
GND
-
Ground Reference for all signals.
WDI
I
Watchdog Input (CMOS). If WDI remains high or low for the duration of the watchdog timeout period
(tWD), the internal watchdog timer trigger a reset output. Floating WDI or connecting WDI to a high-
impedance three-state buffer disables the watchdog feature. The internal watchdog timer clears whenever
reset is asserted or WDI occurs a rising or falling edge.
RESET
O
Active-Low Reset Output (Push-Pull or Open-Drain). It goes low when Vcc is below the reset threshold.
It remains low for about 200ms after one of the following occurs: Vcc rises above the reset threshold
(VRST), the watchdog triggers a reset, or MR goes from low to high.
RESET
O
The inverse of RESET, active high. Whenever RESET is high, RESET is low.
NC
-
No connection.
Block Diagram
PT7M7823/24/25 Block Diagram
Watchdog
Transition Detector
Watchdog Timer
Timebase for Reset
& Watchdog
Reset Generator
VCC
VRST
WDI
MR
VCC
RESET
RESET
(PT7M7823/
24/25)
(PT7M7824/
25)
(PT7M7823/24)
(PT7M7823/25)
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PT7M7803/7809-7812/7823-7825
PT7M7803/09/10/11/12 Block Diagram
Maximum Ratings
Storage Temperature ............................................................-65oC to +150oC
Ambient Temperature with Power Applied.......................... -40oC to +85oC
Supply Voltage to Ground Potential (Vcc to GND) ..............-0.3V to +7.0V
DC Input Voltage (All inputs except Vcc and GND)......-0.3V to VCC+0.3V
Open-drain RESET …………………………………….…..-0.3V to +7.0V
DC Output Current (All outputs) ..........................................................20mA
Power Dissipation .......................................... 320mW (Depend on package)
Recommended Operation Conditions
Sym
Description
Test Conditions
Min.
Typ.
Max.
Unit
VCC
Supply Voltage for 78xxL/M/J
-
4.5
5.0
5.5
V
Supply Voltage for 78xxT/S
-
3.0
3.3
5.5
V
Supply Voltage for 78xxR/Z/Y/K/G
-
2.7
3.0
5.5
V
VIH
Input High Voltage (WDI, MR)
-
0.7VCC
-
VCC
V
Input High Voltage for Open-drain RESET
0
--
5.5
V
VIL
Input Low Voltage
-
-
-
0.3VCC
V
TA
Operating Temperature
-
-40
-
85
ºC
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the
device. This is a stress rating only and functional
operation of the device at these or any other condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure
to absolute maximum rating conditions for extended
periods may affect reliability.
Timebase for Reset
Reset Generator
VCC
VRST
MR
VCC
RESET
RESET
(PT7M7803/
/09/11)
(PT7M7810/
12)
(PT7M7811/12)
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PT7M7803/7809-7812/7823-7825
DC Electrical Characteristics
(VCC = VRN + 5% to 5.5V, TA= -40~85ºC, unless otherwise noted.)(Note 1)
Symbol
Description
Test Conditions
Min.
Typ.
Max.
Unit
VCC
Operating Voltage Range
-
1.0
-
5.5
V
ICC
Supply Current
Vcc = 5V, No
load
7803/09/10/11/12
-
10
30
µA
7823/24/25
-
13
36
VIH
Input High Voltage
Pin: MR, WDI
0.7VCC
-
VCC
V
VIL
Input Low Voltage
Pin: MR, WDI
-
-
0.3VCC
V
VRST
Threshold Voltage(Falling-
edge)(Note 2)
TA= 25ºC
78xx
VRN - 1.5%
VRN
VRN + 1.5%
V
TA= -40 ~ 85ºC
VRN - 2.5%
VRN
VRN + 2.5%
VRTH
Reset Threshold Hysteresis
(Note 2)
Vcc varies
between
VRN ± 5%
7823/24/25L/M
-
12
-
mV
7823/24/25
T/S/R/K/Z/Y
-
4
-
Others
-
50
-
VOH
Output High
Voltage(Except
7823/24/25)
Vcc 4.5V Isource=800µA
Vcc-1.5
-
-
V
Vcc 2.7V Isource=500µA
0.8×Vcc
-
-
Vcc 1.8V Isource=150µA
0.8×Vcc
-
-
Vcc 1.0V Isource=4µA
0.8×Vcc
-
-
Output High
Voltage(7823/24/25)
7823/24/25L/M, Vcc=VRST
Isource=120µA
Vcc-1.5
-
-
V
7823/24/25T/S/R/K, Vcc=VRST
Isource=30µA
0.8×Vcc
-
-
V
VOL
Output Low Voltage
Vcc 4.5V Isink=3.2mA
-
-
0.4
V
Vcc 2.7V Isink=1.2mA
-
-
0.3
Vcc 1.0V Isink=100µA
-
-
0.3
ILKG
Open-Drain Output
Leakage Current
VCC > VTH(MAX) for 7803
-
-
1
µA
IWDI
Average WDI Input
Current (Note 3)
WDI connected to VCC: 5.5V
-
120
160
µA
WDI connected to GND
-20
-15
-
Isource
RESET Output Short-
Circuit Current (only for
PT7M7823/24/25)
PT7M782xL/M, RESET=0V,
Vcc=5.5V
-
-
800
µA
PT7M782xT/S/R/K/Z/Y, RESET=0V,
Vcc=3.6V
-
-
400
r
MR pull-up resistor
(internal)
PT7M7811/7812
10
20
40
k
PT7M7823/7824/7825
35
52
75
Note: 1. Parameters of room temperature guaranteed by production test and parameters of full-temperature guaranteed by design.
2. Valid for both RESET and RESET. VRST (VRTH-) is the Reset threshold voltage when VCC from high to low level, and VRTH+ is the Reset threshold
voltage when VCC from low to high level. VRN is nominal reset threshold voltage.
3. WDI is internally serviced within the watchdog period if WDI is left unconnected.
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PT7M7803/7809-7812/7823-7825
AC Electrical Characteristics
Symbol
Description
Test Conditions
Min.
Typ.
Max.
Unit
tRS
Reset Pulse Width
MR from low to High.
140
200
400
ms
tWD
Watchdog Timeout Period
WDI, MR tied to Vcc, Vcc>VRN+5%.
1.12
1.6
2.25
s
tMR
MR Pulse Width
-
200
-
-
ns
tMD
MR to RESET Delay
Vcc=5V
-
-
250
ns
tWP
WDI Pulse Width
-
150
-
-
ns
Watchdog Timing Diagram
VCC
tRS
RESET
RESET
VRST VRST
WDI
tWD tRS
MR
tMD
tMR
tWP
tRS
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PT7M7803/7809-7812/7823-7825
Functional Description
Reset Output
A microprocessor (P) reset input starts the P in a known state. Whenever the P is in an unknown state, it should be held in
reset. The supervisory circuits assert reset during power-up and prevent code execution errors during power-down or brownout
conditions.
On power-up, once Vcc reaches about 1.0V, RESET is a guaranteed logic low of 0.4V or less. As Vcc rises, RESET stays low.
When Vcc rises above the reset threshold, an internal timer releases RESET after about 200ms. RESET pulses low whenever Vcc
drops below the reset threshold, i.e. brownout condition. If brownout occurs in the middle of a previously initiated reset pulse, the
pulse continues for at least another 200ms. On power-down, once Vcc falls below the reset threshold, RESET stays low and is
guaranteed to be 0.4V or less until Vcc drops below 1.0V. Watchdog Timing Diagram shows the timing relationship.
The active-high RESET output is simply the inverse of the RESET output, and is guaranteed to be valid with Vcc down to 1.0V.
Watchdog Timer
The PT7M78xx watchdog circuit monitors the P activity. If the P does not toggle the watch-dog input (WDI) within 1.6s, reset
asserts. As long as reset is asserted or the WDI input is toggled, the watchdog timer will stay clear and will not count. As soon as
reset is released, the timer will start counting. WDI input pulses as short as 150ns can be detected.
Disable the watchdog function by leaving WDI unconnected or by three-stating driver connected to WDI.
Do not apply voltage level on DCI over Vcc.
Manual Reset
The manual-reset input (MR) allows reset to be triggered by a push button switch. MR has an internal pullup resistor, so it can be
left open when not used. Do not apply voltage level over Vcc.
Typical Application Circuit
VCC
VCC
RESET
(RESET)
VCC
GND
PT7M7809 (10)
Application
Circuit
µP
VCC
VCC
RESET
RESET
VCC
GND
PT7M7803
Application
Circuit
µP
RESET
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PT7M7803/7809-7812/7823-7825
µP
VCC
VCC
RESET
RESET
RESET
VCC
MR
RESET
PT7M7825
Application
Circuit
µP
VCC
VCC
RESET
I/O
RESET
(RESET)
VCC
MR
INT
PT7M7811 (12)
Application
Circuit
GND
µP
VCC
VCC
RESET
I/O
RESET
WDI
GND
VCC
MR
PT7M7823
Application
Circuit
VCC
VCC
RESET
I/O
RESET
GND
VCC
PT7M7824
Application
Circuit
RESET
WDI
µP
GND
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Mechanical Information
T (SOT23)
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C (SC70)
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TA (SOT23)
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TB (SOT143)
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Note: For latest package info, please check: http://www.pericom.com/support/packaging/packaging-mechanicals-and-thermal-characteristics/
Ordering Information
Part Number
Package Code
Package
PT7M7803XTEX
T
3-Pin, Small Outline Transistor Plastic (SOT23), Tape & Reel
PT7M7809XTEX
T
3-Pin, Small Outline Transistor Plastic (SOT23), Tape & Reel
PT7M7810XTEX
T
3-Pin, Small Outline Transistor Plastic (SOT23), Tape & Reel
PT7M7803XC3EX
C3
3-Pin, SOT323 (SC70), Tape & Reel
PT7M7809XC3EX
C3
3-Pin, SOT323 (SC70), Tape & Reel
PT7M7810XC3EX
C3
3-Pin, SOT323 (SC70), Tape & Reel
PT7M7811XTAEX
TA
5-Pin, Small Outline Transistor Plastic Package (SOT23), Tape & Reel
PT7M7812XTAEX
TA
5-Pin, Small Outline Transistor Plastic Package (SOT23), Tape & Reel
PT7M7823XTAEX
TA
5-Pin, Small Outline Transistor Plastic Package (SOT23), Tape & Reel
PT7M7824XTAEX
TA
5-Pin, Small Outline Transistor Plastic Package (SOT23), Tape & Reel
PT7M7825XTAEX
TA
5-Pin, Small Outline Transistor Plastic Package (SOT23), Tape & Reel
PT7M7811XTBEX
TB
4-Pin (SOT143), Tape & Reel
PT7M7812XTBEX
TB
4-Pin (SOT143), Tape & Reel
*PT7M7809XUWF
UWF
Wafer form
Note:
Thermal characteristics can be found on the company web site at www.pericom.com/packaging/
E = Pb-free and Green
Adding X Suffix= Tape/Reel
“*” for UWF package, please check the storage with related sales.
Suffix: X—Monitored Voltage
X
L
M
T
S
R
Z
Y
J
K
G
Reset Threshold
(V)
4.63
4.38
3.08
2.93
2.63
2.32
2.20
4.00
2.25
2.80
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Marking Information
Part Number Code
Code 1 2
Part No
Code 1 2
Code 1 2
Part No
Code 1 2
Part No
AA
PT7M7809L
AO
BC
PT7M7803L
BQ
PT7M7824L
AB
PT7M7809M
AP
BD
PT7M7803M
BR
PT7M7824M
AC
PT7M7809T
AQ
BE
PT7M7803T
BS
PT7M7824T
AD
PT7M7809S
AR
BF
PT7M7803S
BT
PT7M7824S
AE
PT7M7809R
AS
BG
PT7M7803R
BU
PT7M7824R
AF
PT7M7809Z
AT
BH
PT7M7803Z
BV
PT7M7824Z
AG
PT7M7809Y
AU
BI
PT7M7803Y
BW
PT7M7824Y
jm
PT7M7809J
sf
sc
PT7M7803J
si
PT7M7824J
pE
PT7M7809G
mQ
PT7M7824K
AH
PT7M7810L
AV
BJ
PT7M7823L
BX
PT7M7825L
AI
PT7M7810M
AW
BK
PT7M7823M
BY
PT7M7825M
AJ
PT7M7810T
AX
BL
PT7M7823T
BZ
PT7M7825T
AK
PT7M7810S
AY
BM
PT7M7823S
CA
PT7M7825S
AL
PT7M7810R
AZ
BN
PT7M7823R
CB
PT7M7825R
AM
PT7M7810Z
BA
BO
PT7M7823Z
CC
PT7M7825Z
AN
PT7M7810Y
BB
BP
PT7M7823Y
CD
PT7M7825Y
se
PT7M7810J
sg
sh
PT7M7823J
sj
PT7M7825J
mP
PT7M7823K
Code
Description
1 2
Part Number
3
Year
4
Work Week
•
Only for PT7M7809M
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IMPORTANT NOTICE
DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume all
risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated website,
harmless against all damages.
Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
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indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the final
and determinative format released by Diodes Incorporated.
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Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the labeling
can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
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