View ds1811 datasheet:

DS1811 5V EconoReset with Open Drain Output www.dalsemi.com FEATURES PIN ASSIGNMENT Automatically restarts a microprocessor after 3 power failure Maintains reset for 150 ms after VCC returns to an in-tolerance condition Reduces need for discrete components Precision temperature-compensated voltage 1 2 reference and voltage sensor SOT-23 PACKAGE Low-cost TO-92 or space saving SOT-23 packages available 1 2 3 Efficient open-drain output with internal 5.5 k? pull-up resistor 1 2 3 Operating temperature -40°C to +85°C TO-92 PACKAGE See Mech. Drawings Section PIN DESCRIPTION TO-92 1 RST Active Low Reset Output 2 VCC Power Supply 3 GND Ground SOT-23 1 RST Active Low Reset Output 2 VCC Power Supply 3 GND Ground DESCRIPTION The DS1811 EconoReset uses a preci