DS1236A

MicroManager Chip

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Overview

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 DS1236A-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
Freshness Seal on Battery Attachment

The DS1236A 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. The DS1236A 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 input which is debounced and activates reset outputs. An internal watchdog timer can also force the reset outputs to the active state if the strobe input is not driven low prior to watchdog timeout. Reset control and wake-up/sleep control inputs also provide the necessary signals for orderly shutdown and start-up in battery backup and battery operated applications.