DS1238

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Power fail detect with referenced comparator, NMI:
- Warns microprocessor of an impending power failure
- Holds microprocessor in check during power transients
- Halts and restarts an out-of-control microprocessor
- Provides orderly shutdown in nonvolatile microprocessor applications
- Invokes sleep mode
Pushbutton reset:
- Monitors pushbutton for external override
- Controls external power switch for high-current applications
- Controls low-power stop mode in battery operated hand-held applications
Watchdog timer
5V operation with active high and low resets:
- ±5% of 5V (DS1238-5, DS1238A-5)
- ±10% of 5V (DS1238, DS1238A)
Battery switch:
- Converts CMOS SRAM into nonvolatile memory
Control pins gate to external power switch for high-current applications
CE control:
- Unconditionally write-protects memory when power supply is out of tolerance
Optional freshness mode (DS1238) seals battery until first power-on
Consumes less than 200nA of battery current at 25°C
Operating ranges:
- DS1238, DS1238A: 0°C to +70°C
- DS1238-IND, DS1238A-IND: -40°C to +85°C
Pin-for-pin compatibility with MAX691, MAX693, MAX695
Optional internal or external timing control

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