Processor Supervisor 4.62V/4.37V 4.5V to 4.75V 8-Pin PDIP

The TC1232 is a fully-integrated processor supervisor that 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 250 msec after VCC is within tolerance to ensure a stable system start-up. Microprocessor sanity is monitored by the onboard 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 (150 msec, 600 msec or 1200 msec), 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 PDIP or SOIC package, a 16-Pin SOIC (wide) package and requires no external components.

• Precision Voltage Monitor - Adjustable +4.5V or +4.75V
• Reset Pulse Width – 250 msec minimum
• No External Components
• Adjustable Watchdog Timer - 150 msec, 600 msec or 1.2 sec
• Operating Voltage 4.0V to 5.5V
• Debounced Manual Reset Input for External Override