TC1232COA Integrated Circuit Chip Microprocessor Monitor processor supervisor

TC1232

MICROPROCESSOR MONITOR

FEATURES

■ Precision Voltage Monitor ....................... Adjustable +4.5V or +4.75V

■ Reset Pulse Width ............................. 250msec Min

■ No External Components

■ Adjustable Watchdog Timer ........................ 150msec, 600msec or 1.2sec

■ Debounced Manual Reset Input for External Override

APPLICATIONS

■ Computers

■ Controllers

■ Intelligent Instruments

■ Automotive Systems

■ Critical µP Power Monitoring

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 reset state for a minimum of 250msec after V_CC 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 periodic 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 processor is indicated and the TC1232 issues a processor reset as a result.

The outputs of the TC1232 are immediately driven active when the PB input is brought low by an external pushbutton 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.

FUNCTIONAL BLOCK DIAGRAM

ABSOLUTE MAXIMUM RATINGS*

Voltage on Any Pin (With Respect to GND)       – 0.3V to +5.8V

Operating Temperature Range:

    TC1232C ....................................................... 0°C to +70°C

    TC1232E ................................................. – 40°C to + 85°C

Storage Temperature Range ...................... – 65°C to +150°C

Lead Temperature (Soldering, 10 sec) ....................... +300°C

*Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

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