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GENERAL DESCRIPTION

The TC32M is a fully-integrated processor supervisor in a 3-pin package. 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 TC32M holds the processor in the reset state for a minimum of 500msec after VDD 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 high-to-low level shift (through an external resistor divider) on the RS pin of the TC32M. Should the processor fail to supply this signal within the specified timeout period (typically 700msec), an out-of control processor is indicated and the TC32M issues a processor reset as a result.

The output of the TC32M can be wire-ORed with a push button switch (or electronic signal) to override the TC32M and unconditionally reset the processor. When connected to a push-button switch, the TC32M provides contact debounce.

The TC32M is packaged in a space-saving TO-92 or SOT-223 package. It provides all of the functionality of the industry standard TC1232 in a smaller, lower cost configuration.

FEATURES

■ Incorporates the Functionality of the Industry

Standard TC1232 (Processor Monitor, Watchdog

and Manual Override RESET Controller) into a

Small, Lower Cost Package

■ Guards Against Unstable Processor Operation

Resulting from Power Brown-Out

■ Automatically Halts and Restarts an Out-of

Control Microprocessor

■ Output can be Wire-ORed, or Hooked to Manual

RESET Push-button Switch

■ Space-Saving 3-Pin TO-92 or SOT-223 Package

APPLICATIONS

■ All Microprocessor-Based Systems

■ Battery Powered Computers and Controllers

■ Automotive Systems

■ Intelligent Instruments

■ Critical Processor Monitoring

■ Embedded Controllers