ILC1232 View Datasheet(PDF) - Impala Linear Corporation

Part Name

Description

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ILC1232

mP Supervisory Circuit

Impala Linear Corporation 

Impala Linear Corporation

ILC1232

mP Supervisory Circuit

General Description

The ILC1232 is a multifunction circuit which monitors micro-

processor activity, external reset and power supplies in

microprocessor based systems. The circuit functions

include a watchdog timer, power supply monitor, micro-

processor reset, and manual pushbutton reset input.

The power supply line is monitored with a comparator and

an internal voltage reference. RST is forced low when an

out-of-tolerance condition exists and remains asserted for

at least 250ms after VCC rises above the threshold voltage

(4.5V or 4.75V). The RST pin will remain logic low with VCC

as low as 1.4V.

The Watchdog input (ST) monitors mP activity and will

assert RST if no mP activity has occurred within the watch-

dog timeout period. The watchdog timeout period is selec-

table with nominal periods of 150, 600, or 1200 milliseconds.

Features

• Power OK/Reset Time Delay, 250ms min.

• Watchdog Timer, 150ms, 600ms, or 1.2s typical

• Precision Supply Voltage Monitor, Select Between 5% or

10% of Supply Voltage

• 18µA Supply Current

• Debounced External Reset Input

• 8-Pin SO Package

Applications

• Computers

• Controllers

• Critical Microprocessor Power Monitoring

• Intelligent Instruments

• Portable Equipment

Ordering Information

Part

ILC1232N

ILC1232M

Package

8-Lead PDIP

8-Lead SOIC

Temp. Range

-40°C to +85°C

-40°C to +85°C

Typical Circuit

VCC

VCC

TD

ILC1232

PBRST

TOL

ST

RST

GND

VCC

µP

I/O

RESET

Pin Package Configurations

Top View

PBRST 1

TD 2

TOL 3

GND 4

ILC1232

8 VCC

7 ST

6 RST

5 RST

ETC1232N - 8 Lead Plastic DIP Package

ETC1232M - 8 Lead Plastic SOIC Package

Impala Linear Corporation

ILC1232 1.1

(408) 574-3939 www.impalalinear.com

Sept 1999

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