TC1232

Specifications

Parameter Name	Value
Manual Reset	Yes
Watchdog Timer	Yes
Typical Reset Pulse Width (ms)	610
Reset Type	Active Low/High
Typical Supply Current (uA)	50
Vcc Range Min (V)	4.5
Vcc Range Max (V)	5.5
Output	Push-Pull/Open-Drain
Temp Range Min. (°C)	-40
Temp Range Max. (°C)	+85
Nominal Reset Voltage (V)	4.50, 4.25

Description

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 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 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 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.