View ds1817 datasheet:

DS1817 Active High 3.3V EconoReset 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 See Mech. Drawing Accurate 5%, 10% or 20% power monitoring 20% tolerance for use with 3.0-volt systems 1 2 3 Low-cost TO-92 or space saving surface mount SOT-23 packages available 1 2 3 Push-pull active high output Operating temperature -40°C to +85°C TO-92 PACKAGE See Mech. Drawing PIN DESCRIPTION TO-92 1 RST Active High Reset Output 2 VCC Power Supply 3 GND Ground SOT-23 1 RST Active High Reset Output 2 VCC Power Su