TC1232 Ver la hoja de datos (PDF) - TelCom Semiconductor Inc => Microchip

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TC1232

MICROPROCESSOR MONITOR

TelCom Semiconductor Inc => Microchip 

1 PRELIMINARY INFORMATION

TC1232

MICROPROCESSOR MONITOR

FEATURES

s Precision Voltage

Monitor ....................... Adjustable +4.5V or +4.75V

s Reset Pulse Width ............................. 250msec Min

s No External Components

s Adjustable Watchdog

Timer ........................ 150msec, 600msec or 1.2sec

s Debounced Manual Reset Input for External

Override

APPLICATIONS

s Computers

s Controllers

s Intelligent Instruments

s Automotive Systems

s Critical µP Power Monitoring

ORDERING INFORMATION

Part No.

Package

TC1232COA

TC1232COE

TC1232CPA

TC1232EOA

TC1232EOE

TC1232EPA

8-Pin SOIC

16-Pin SOIC (Wide)

8-Pin PDIP

8-Pin SOIC

16-Pin SOIC (Wide)

8-Pin PDIP

Temp. Range

0°C to +70°C

0°C to +70°C

0°C to +70°C

– 40°C to +85°C

– 40°C to +85°C

– 40°C to +85°C

2

GENERAL DESCRIPTION

The TC1232 is a fully-integrated processor supervisor.

It provides three important functions to safeguard processor

sanity: precision power on/off reset control, watchdog timer

and external reset override.

On power-up, the TC1232 holds the processor in the

3 reset state for a minimum of 250msec after VCC is within

tolerance to ensure a stable system start-up.

Microprocessor sanity is monitored by the on-board

watchdog circuit. The microprocessor must provide a peri-

odic low-going signal on the ST input. Should the processor

fail to supply this signal within the selected time-out period

(150msec, 600msec or 1200msec), an out-of-control pro-

cessor is indicated and the TC1232 issues a processor reset

4 as a result.

The outputs of the TC1232 are immediately driven

active when the PB input is brought low by an external push-

button switch or other electronic signal. When connected to

a push-button switch, the TC1232 provides contact

debounce.

The TC1232 is packaged in a space-saving 8-pin plastic

DIP or SOIC package and requires no external components.

5

FUNCTIONAL BLOCK DIAGRAM

VCC

TOL

5%/10%

TOLERANCE

SELECT

+

–

+

REF

RESET

GENERATOR

RST

6

RST

PB RST

DEBOUNCE

TC1232

7

TD

WATCHDOG

TIMEBASE

SELECT

GND

TELCOM SEMICONDUCTOR, INC.

WATCHDOG

TIMER

ST

8

TC1232-4 11/6/96

5-19

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