DS1231S

DS1231/S DS1231/S Power Monitor Chip FEATURES PIN ASSIGNMENT IN MODE TOL GND 1 2 3 4 8 7 6 5 VCC NMI RST RST Warns processor of an impending power failure Provides time for an orderly shutdown Prevents processor from destroying nonvolatile memory during power transients restarts processor after power is DS1231 8–Pin DIP (300 MIL) See Mech. Drawings Section NC IN NC MODE NC TOL NC GND 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 NC VCC NC NMI NC RST NC RST Automatically restored Suitable for linear or switching power supplies Adjusts to hold time of the power supply Supplies necessary signals for processor interface Accurate 5% or 10% VCC monitoring Replaces power-up reset circuitry No external capacitors required Optional 16-pin SOIC surface mount package DS1231S 16–Pin SOIC (300 MIL) See Mech. Drawings Section PIN DESCRIPTION IN MODE TOL GND RST RST NMI VCC NC – – – – – – – – – Input Selects input pin characteristics Selects 5% or 10% VCC detect Ground Reset (Active High) Reset (Active Low, open drain) Non–Maskable Interrupt +5V Supply No Connections DESCRIPTION The DS1231 Power Monitor Chip uses a precise temperature-compensated reference circuit which provides an orderly shutdown and an automatic restart of a processor-based system. A signal warning of an impending power failure is generated well before regulated DC voltages go out of specification by monitoring high voltage inputs to the power supply regulators. If line isolation is required a UL-...