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These microprocessor (µP) supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery control functions in µP 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 Reset Threshold section in the Detailed Description). All these parts are available in 8-pin DIP and SO packages.
MAX690S Maximum Ratings
Terminal Voltage (with respect to GND) VCC...................................................................-0.3V to 6.0V VBATT................................................................-0.3V to 6.0V All Other Inputs ................-0.3V to the higher of VCC or VBATT All Other Inputs ................-0.3V to the higher of VCC or VBATT Continuous Input Current VCC............................................................................100mA VBATT ..........................................................................18mA GND..............................................................................18mA Output Current RESET PFO....................................................................18mA VOUT ..............................................................................100mA
MAX690S Features
RESETand RESET Outputs Manual Reset Input Precision Supply-Voltage Monitor 200ms Reset Time Delay Watchdog Timer (1.6sec timeout) Battery-Backup Power Switching-Battery Can Exceed VCC in Normal Operation 40µA VCC Supply Current 1µA Battery Supply Current Voltage Monitor for Power-Fail or Low-Battery Warning Guaranteed RESET Assertion to VCC = 1V 8-Pin DIP and SO Packages
MAX690S Typical Application
Battery-Powered Computers and Controllers Embedded Controllers Intelligent Instruments Automotive Systems Critical µP Power Monitoring Portable Equipment