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General Description

These microprocessor (?P) supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery-control functions in ?P systems. They significantly improve system reliability and accuracy compared to separate ICs or discrete components.

These devices are designed for use in systems powered by 3.0V or 3.3V supplies. See the selector guide in the back of this data sheet for similar devices designed for 5V systems. The suffixes denote different reset threshold voltages: 3.075V (T), 2.925V (S), and 2.625V (R) (see the Reset Thresholdsection in the Detailed Description). All these parts are available in 8-pin DIP and SO packages.

Features

??RESET and RESET Outputs

? Manual Reset Input

? Precision Supply-Voltage Monitor

? 200ms Reset Time Delay

? Watchdog Timer (1.6s timeout)

? Battery-Backup Power Switching¡ªBattery Can Exceed VCCin Normal Operation

? 40?A VCCSupply Current

? 1?A Battery Supply Current

? Voltage Monitor for Power-Fail or Low-Battery Warning

? Guaranteed RESET Assertion to VCC= 1V

? 8-Pin DIP and SO Packages

Applications

?? Battery-Powered Computers and Controllers

?? Embedded Controllers

?? Intelligent Instruments

?? Automotive Systems

?? Critical ?P Power Monitoring

Portable Equipment