DS12R885S-33+T&R

The DS1238 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 DS1238 also provides early warning detection of a user-defined threshold by driving a non-maskable interrupt.
FEATURES◾ 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◾ Delays write protection until completion of the current memory cycle◾ Consumes less than 200 nA 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 DS1238-5◾ 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