ADM802L

a Microprocessor Supervisory Circuits ADM690A/ADM692A/ADM802L/M/ADM805L/M FUNCTIONAL BLOCK DIAGRAM VBATT BATTERY SWITCHOVER VCC VOUT FEATURES Precision Supply Voltage Monitor 4.65 V ADM690A/ADM802L/ADM805L 4.40 V ADM692A/ADM802M/ADM805M Reset Assertion Down to 1 V V CC Reset Timeout—200 ms Watchdog Timer—1.6 s 100 ␮ A Quiescent Supply Current Automatic Battery Backup Power Switching Voltage Monitor for Power Fail ؎ 2% Power Fail Accuracy on ADM802L/M Space-Saving MicroSOIC Package (ADM690A) APPLICATIONS Microprocessor Systems Computers Controllers Intelligent Instruments 4.65V* RESET GENERATOR RESET (RESET) WATCHDOG INPUT (WDI) WATCHDOG TRANSITION DETECTOR (1.6s) POWER FAIL INPUT (PFI) 1.25V ADM690A ADM692A ADM802L ADM802M ADM805L ADM805M POWER FAIL OUTPUT (PFO) *4.4V FOR ADM692A/ADM802M/ADM805M ( ) = ADM805L/M ONLY GENERAL DESCRIPTION The ADM690A/ADM692A/ADM802L/M/ADM805L/M family of supervisory circuits offers complete single chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include µP reset, backup battery switchover, watchdog timer, and power failure warning. The ADM690A/ADM692A/ADM802L/M/ADM805L/M are available in 8-pin packages and provide: 1. Power-on reset output during power-up, power-down and brownout conditions. The RESET output remains operational with VCC as low as 1 V. 2. Battery backup switching for CMOS RAM, CMOS microprocessor or other low power devices. 3. A reset pulse if the opti...