View ds1814 d datasheet:

DS1814/DS1819 5V and 3.3V MicroMonitor www.maxim-ic.com FEATURES PIN ASSIGNMENT Halts and restarts an out-of-control 3 2 1 microprocessor Holds microprocessor in check during power transients Automatically restarts microprocessor after power failure 4 5 Monitors pushbutton for external override SOT-23-5 PACKAGE Accurate 5%, 10%, or 20% (3V only) See Mech. Drawing microprocessor power monitoring Eliminates the need for discrete components 20% tolerance for use with 3.0V systems PIN DESCRIPTION Pin- and function-compatible with the DS181xA MAX823/24/25 products 1 RST Active Low Reset Output Low cost SOT-23-5 package 2 GND Ground Industrial temperature range: -40 C to +85 C 3 PBRST Pushbutton Reset Input 4 ST Strobe Input DEVICE RST WD RST PBRST 5 VCC P