ASM1232LPCMA ALSC [Alliance Semiconductor Corporation], ASM1232LPCMA Datasheet

ASM1232LPCMA

Manufacturer Part Number

ASM1232LPCMA

Description

5V uP Power Supply Monitor and Reset Circuit

Manufacturer

ALSC [Alliance Semiconductor Corporation]

Datasheet

1.ASM1232LPCMA.pdf (10 pages)

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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.

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%

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

Notice: The information in this document is subject to change without notice

5V µP Power Supply Monitor and Reset Circuit

power supply falls outside

input voltage status.

reference

and

Alliance Semiconductor

PBRST

TOL

•

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

40kΩ

ASM1232LP/LPS

GND

Watchdog Transition

Tolerance Selection

Voltage Sense

Push Button

Comparators

Debounce

Reference

Detector

RESET

TOL

ASM1232LP/LPS

GND

10kΩ

Watchdog Timer

+5V

Reset &

RESET

I/O

µP

RESET

Related parts for ASM1232LPCMA

ASM1232LPCMA Summary of contents

Page 1

January 2005 rev 1.5 5V µP Power Supply Monitor and Reset Circuit 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 ...

Page 2

January 2005 rev 1.5 Pin Configuration DIP/SO/MicroSO 1 PBRST 2 ASM1232LP TD ASM1232LPS-2 3 TOL ASM1232LPU 4 GND Pin Description Pin # Pin # 8-Pin Package 16-Pin Package ...

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

January 2005 rev 1.5 Ordering Information Part Number Package TIN-LEAD DEVICES ASM1232LP 8L PDIP ASM1232LPN 8L PDIP ASM1232LPS 16L SOIC ASM1232LPS-2 8L SOIC ASM1232LPSN 16L SOIC ASM1232LPSN-2 8L SOIC ASM1232LPU 8L MSOP ASM1232LPUN 8L MSOP LEAD FREE DEVICES ASM1232LPF 8L ...

Page 10

Alliance Semiconductor Corporation 2575, Augustine Drive, Santa Clara, CA 95054 Tel: 408 - 855 - 4900 Fax: 408 - 855 - 4999 www.alsc.com © Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are ...

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