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DS1231/S Datasheet(PDF) 1 Page - Maxim Integrated Products |
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DS1231/S Datasheet(HTML) 1 Page - Maxim Integrated Products |
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1 / 9 page  DS1231/S DS1231/S Power Monitor Chip 022698 1/9 FEATURES • Warns processor of an impending power failure • Provides time for an orderly shutdown • Prevents processor from destroying nonvolatile memory during power transients • Automatically restarts processor after power is 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% V CC monitoring • Replaces power-up reset circuitry • No external capacitors required • Optional 16-pin SOIC surface mount package PIN ASSIGNMENT MODE NC GND RST NC VCC NC NMI NC RST NC NC TOL NC IN NC DS1231S 16–Pin SOIC (300 MIL) See Mech. Drawings Section VCC NMI RST RST IN MODE TOL GND DS1231 8–Pin DIP (300 MIL) See Mech. Drawings Section 1 2 3 4 5 6 7 8 1 11 12 13 14 2 3 4 5 6 7 8 9 10 15 16 PIN DESCRIPTION IN – Input MODE – Selects input pin characteristics TOL – Selects 5% or 10% VCC detect GND – Ground RST – Reset (Active High) RST – Reset (Active Low, open drain) NMI – Non–Maskable Interrupt VCC – +5V Supply NC – No Connections DESCRIPTION The DS1231 Power Monitor Chip uses a precise tem- perature-compensated reference circuit which provides an orderly shutdown and an automatic restart of a pro- cessor-based system. A signal warning of an impending power failure is generated well before regulated DC voltages go out of specification by monitoring high volt- age inputs to the power supply regulators. If line isola- tion is required a UL-approved opto-isolator can be di- rectly interfaced to the DS1231. The time for processor shutdown is directly proportional to the available hold-up time of the power supply. Just before the hold-up time is exhausted, the Power Monitor uncondi- tionally halts the processor to prevent spurious cycles by enabling Reset as VCC falls below a selectable 5 or 10 percent threshold. When power returns, the proces- sor is held inactive until well after power conditions have stabilized, safeguarding any nonvolatile memory in the system from inadvertent data changes. |
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Similar Description - DS1231/S |
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