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