Microchip Technology, Inc. 5V Voltage Supervisor w/ Manual Reset, Watchdog and Dual Rest Outputs MIC1232

The MIC1232 is a multifunction circuit which monitors microprocessor activity, external reset and power supplies in microprocessor based systems. The circuit functions include a watchdog time, power supply monitor, microprocessor reset, and manual pushbutton reset input. The power supply line is monitored with a comparator and an internal voltage reference. /RST is forced low when an out-of-tolerance condition exists and remains asserted for at least 250ms after VCC rises above the threshold voltage (4.5V or 4.75V). The /RST pin will remain logic low with VCC as low as 1.4V. The Watchdog input (/ST) monitors µP activity and will assert /RST if no µP activity has occurred with in the watchdog timeout period. The watchdog timeout period is selectable with nominal period of 150, 600, 1200 milliseconds. Additional Features Power OK/Reset time delay, 250ms min. Watchdog timer, 150ms, 600ms, or 1.2s typical Precision supply voltage monitor, select between 5% or 10% of supply voltage Available in 8-pin surface mount (SO) Debounced External reset input Low supply current, <18µA typical