DESCRIPTION

The DS1236 MicroManager Chip 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.

FEATURES

■ Holds microprocessor in check during power transients

■ Halts and restarts an out-of-control microprocessor

■ Monitors pushbutton for external override

■ 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 100 nA of battery current at 25°C

■ Controls external power switch for high current applications

■ Accurate 10 power supply monitoring

■ Optional 5 power supply monitoring designated DS1236-5

■ Provides orderly shutdown in nonvolatile microprocessor applications

■ Supplies necessary control for low-power “stop mode” in battery operated hand-held applications

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

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