ASM1232LPS Alliance Semiconductor, ASM1232LPS Datasheet

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ASM1232LPS

Manufacturer Part Number
ASM1232LPS
Description
5V uP Power Supply Monitor and Reset Circuit
Manufacturer
Alliance Semiconductor
Datasheet

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January 2005
rev 1.5
General Description
The ASM1232LP/LPS is a fully integrated microprocessor
supervisor. It can halt and restart a “hung-up” microprocessor,
restart a microprocessor after a power failure. It has a
watchdog timer and external reset override.
A
comparator circuits monitor the 5V, V
During power-up or when the V
selectable tolerance limits, both RESET and RESET become
active. When V
signals remain active for an additional 250ms minimum,
allowing the power supply and system microprocessor to
stabilize. The trip point tolerance signal, TOL, selects the trip
level tolerance to be either 5% or 10%.
Each device has both a push-pull, active HIGH reset output
and an open drain active LOW reset output. A debounced
manual reset input, PBRST, activates the reset outputs for a
minimum period of 250ms.
There is a watchdog timer to stop and restart a microprocessor
that is “hung-up”. The watchdog timeouts periods are
selectable: 150ms, 610ms and 1200ms. If the ST input is not
strobed LOW before the time-out period expires, a reset is
generated.
Devices are available in 8-pin DIP, 16-pin SO and compact 8-
pin MicroSO packages.
Key Features
precision
5V supply monitor
Selectable watchdog period
Debounce manual push-button reset input
Precision temperature-compensated voltage reference
and comparator.
Power-up, power-down and brown out detection
250ms minimum reset time
Active LOW open drain reset output and active HIGH
push-pull output
Selectable trip point tolerance: 5% or 10%
CC
temperature-compensated
2575 Augustine Drive . Santa Clara, CA 95054 . Tel: 408.855.4900 . Fax: 408.855.4999 . www.alsc.com
rises above the threshold voltage, the reset
CC
Notice: The information in this document is subject to change without notice
5V µP Power Supply Monitor and Reset Circuit
power supply falls outside
CC
input voltage status.
reference
and
Alliance Semiconductor
PBRST
TD
TOL
V
ST
CC
Applications
Typical Operating Circuit
Block Diagram
Low-cost surface mount packages: 8-pin/16-pin SO, 8-pin
DIP and 8-pin Micro SO packages
Wide operating temperature -40°C to +85°C (N suffixed
devices)
Microprocessor Systems
Computers
Controllers
Portable Equipment
Intelligent Instuments
Automotive Systems
V
40kΩ
CC
ASM1232LP/LPS
GND
Watchdog Transition
Tolerance Selection
Voltage Sense
Push Button
Comparators
Debounce
Reference
Detector
TD
RESET
TOL
ST
ASM1232LP/LPS
+
-
ASM1232LP/LPS
GND
10kΩ
Watchdog Timer
+5V
Reset &
RESET
I/O
µP
RESET
RESET

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ASM1232LPS Summary of contents

Page 1

... Portable Equipment • Intelligent Instuments • Automotive Systems Typical Operating Circuit ASM1232LP/LPS GND Block Diagram V CC TOL V CC 40kΩ PBRST TD ST Alliance Semiconductor ASM1232LP/LPS +5V 10kΩ I/O ST RESET RESET TD TOL ASM1232LP/LPS Tolerance Selection + - Reference Push Button Debounce Reset & Voltage Sense ...

Page 2

... not strobed LOW before the timeout period set by TD expires. 4. During power-up. RESET Active LOW reset output. (See RESET). ST Strobe input power internal connection. ASM1232LP/LPS ASM1232LPS RESET RESET Function = 150ms for TD = GND 610ms ...

Page 3

January 2005 rev 1.5 Detailed Description The ASM1232LP/LPS monitors the microprocessor or microcontroller power supply and generates reset signal, both active HIGH and Active LOW, that halt processor operation whenever the power supply voltage levels are outside a predetermined tolerance. ...

Page 4

January 2005 rev 1.5 When PBRST is held LOW for the minimum time t resets become active and remain active for a minimum time period of 250ms after PBRST returns HIGH. The debounced input is guaranteed to recognize pulses greater ...

Page 5

January 2005 rev 1.5 Absolute Maximum Ratings Parameter Voltage Voltage on ST, TD Voltage on PBRST, RESET, RESET Operating Temperature Range (N suffixed devices) Operating Temperature Range (others) Soldering Temperature (for 10 sec) Storage Temperature ESD rating ...

Page 6

January 2005 rev 1.5 Parameter Input Leakage RESET Low Level Internal Pull-up Resistor Operating Current (CMOS) Input Capacitance Output Capacitance PBRST Manual Reset Minimum Low Time Reset Active Time ST Pulse Width V Fail Detect to RESET or CC RESET ...

Page 7

January 2005 rev 1.5 Package Information MicroSO (8-Pin) SO (8-Pin θ Plastic DIP (8-Pin) 5V µP Power Supply Monitor and Reset Circuit Notice: The information in this document is subject ...

Page 8

January 2005 rev 1.5 SO (16-Pin Inches Min A 0.053 A1 0.004 A2 0.049 B 0.013 C 0.008 D 0.386 E 0.150 e 0.050 BSC H 0.228 h 0.010 L 0.016 θ 0° * JEDEC ...

Page 9

... ASM1232LP/LPS Voltage Monitoring Package Marking Application 5V ASM1232LP 5V ASM1232LPN 5V ASM1232LPS 5V ASM1232LPS-2 5V ASM1232LPSN 5V ASM1232LPSN-2 5V ASM1232LP 5V ASM1232LPN 5V ASM1232LPF 5V ASM1232LPNF 5V ASM1232LPS-2F 5V ASM1232LPSF 5V ASM1232LPSN-2F 5V ASM1232LPSNF 5V ASM1232LPF 5V ASM1232LPNF ...

Page 10

... Fax: 408 - 855 - 4999 www.alsc.com © Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are trademarks or registered trademarks of Alliance. All other brand and product names may be the trademarks of their respective companies. Alliance reserves the right to make changes to this document and its products at any time without notice ...

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