DS1238A

MicroManager

Data Sheet (Rev. 1)

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Overview

Holds microprocessor in check during power transients

Halts and restarts an out-of-control microprocessor

Warns microprocessor of an impending power failure

Converts CMOS SRAM into nonvolatile memory

Unconditionally write protects memory when power supply is out of tolerance

Consumes less than 200nA of battery current

Controls external power switch for high current applications

Debounces pushbutton reset

Accurate 10% power supply monitoring

Optional 5% power supply monitoring designated DS1238A-5

Provides orderly shutdown in microprocessor applications

Pin-for-pin compatible with MAX691

Standard 16-pin DIP or space-saving 16-pin SOIC

Optional industrial temperature range -40°C to +85°C

The DS1238A MicroManager provides all the necessary functions for power supply monitoring, reset control, and memory backup in microprocessor-based systems. A precise internal voltage reference and comparator circuit monitor power supply status. When an out-of-tolerance condition occurs, the microprocessor reset and power-fail outputs are forced active, and static RAM control unconditionally write protects external memory. The DS1238A also provides early warning detection of a user-defined threshold by driving a non-maskable interrupt.