DS1815

www.maxim-ic.com DS1815 3.3V EconoReset with Push-Pull Output FEATURES § Automatically restarts a microprocessor after power failure § Maintains reset for 150ms after VCC returns to an in-tolerance condition § Reduces need for discrete components § Precision temperature-compensated voltage reference and voltage sensor § Accurate 5%, 10% or 20% power monitoring § Low-cost TO-92 or space saving surface- mount SOT-23 packages available § Push-pull output for low current operation § Operating temperature -40°C to +85°C PIN ASSIGNMENT DALLAS DS1815 Econo Reset 3 123 123 BOTTOM VIEW TO-92 PACKAGE See Mech. Drawings Section On Website 12 TOP VIEW SOT-23 PACKAGE See Mech. Drawings Section On Website PIN DESCRIPTION TO-92 1 RST 2 VCC 3 GND Active Low Reset Output Power Supply Ground SOT-23 1 RST 2 VCC 3 GND Active Low Reset Output Power Supply Ground DESCRIPTION The DS1815 EconoReset uses a precision temperature reference and comparator circuit to monitor the status of the power supply (VCC). When an out-of-tolerance condition is detected, an internal power-fail signal is generated which forces reset to the active state. When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for approximately 150ms to allow the power supply and processor to stabilize. 1 of 5 041002 DS1815 OPERATION — POWER MONITOR The DS1815 provides the functions of detecting out-of-tolerance power supply conditions and warning a processor-based system of impending...