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PT7M7809J

Description
Precision supply-voltage monitor
File Size473KB,12 Pages
ManufacturerPericom Semiconductor Corporation (Diodes Incorporated)
Websitehttps://www.diodes.com/
Download Datasheet View All

PT7M7809J Overview

Precision supply-voltage monitor

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PT7M7803/7809-7812/7823-7825
µP Supervisor Circuits
Features
Precision supply-voltage monitor
-
4.63V (PT7M78xxL)
-
4.38V (PT7M78xxM except PT7M7803/09/10M)
-
3.08V (PT7M78xxT)
-
2.93V (PT7M78xxS)
-
2.63V (PT7M78xxR)
-
2.32V (PT7M78xxZ)
-
2.20V (PT7M78xxY)
-
4.00V (PT7M78xxJ)
-
4.26V (PT7M7803/09/10M)
-
2.25V (PT7M7823/24K)
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 V
CC
=1.0V
Monitored Voltage Table
X
L
Reset Threshold (V)
4.63
Description
The PT7M78xx family microprocessor (µP)
supervisory circuits are targeted to improve
reliability and accuracy of power-supply
circuitry in
µP
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
µP
system.
2. Detecting power failure or low-battery
conditions with a 1.25V threshold detector.
3. Watchdog functions
4. Manual reset.
Applications
Power-supply circuitry in
µP
systems
M
1)
4.38
T
3.08
S
2.93
R
2.63
Z
2.32
Y
2.20
J
4.00
K
2)
2.25
Note1):
Threshold voltage=4.38V can be applied to all parts except PT7M7803/09/10M. PT7M7803/09/10M’s threshold voltage
is 4.26V.
2): Threshold voltage=2.25V only for PT7M7823/24K.
Function Comparison
Part No.
1
2
3
4
5
6
7
8
PT7M7803
PT7M7809
PT7M7810
PT7M7811
PT7M7812
PT7M7823
PT7M7824
PT7M7825
RESET output
Push-Pull
-
-
-
Open-Drain
-
-
-
-
-
-
-
RESET
output
(push-pull)
-
-
-
-
Manual Reset
Input
-
-
-
-
Power Fail
Detector
(1.25V)
-
-
-
-
-
-
-
-
Watchdog
Input
-
-
-
-
-
-
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