View max6315 datasheet:

19-2000; Rev 2; 1/00 Open-Drain SOT µP Reset Circuit ________________General Description ____________________________Features The MAX6315 low-power CMOS microprocessor (µP) ¦ Small SOT143 Package supervisory circuit is designed to monitor power sup- ¦ Open-Drain RESET Output Can Exceed VCC plies in µP and digital systems. It provides excellent cir- cuit reliability and low cost by eliminating external ¦ Precision, Factory-Set VCC Reset Thresholds: components and adjustments. The MAX6315 also pro- 100mV Increments from 2.5V to 5V vides a debounced manual reset input. ¦ Four Reset Timeout Periods Available: This device performs a single function: it asserts a reset 1ms, 20ms, 140ms, or 1120ms (minimum) signal whenever the VCC supply voltage falls below a preset threshold o