Maxim Integrated DS1238S-10

Description
The DS1238 MicroManager is a device that provides power supply monitoring, reset control, and memory backup in microprocessor-based systems. It features an internal voltage reference and comparator circuit that monitors 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. External reset control is provided by a pushbutton reset.

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 (DS1238-5)
Provides orderly shutdown in microprocessor applications

Applications
The DS1238 MicroManager is suitable for use in a variety of applications, including:
Microprocessor-based systems
Power supply monitoring
Reset control
Memory backup
Early warning detection
External reset control