MAX802M Datasheet | Maxim Integrated

Description The MAX690A/MAX692A/MAX802L/MAX802M/MAX805L reduce the plexity and number of ponents required for power-supply monitoring and batterycontrol functions in microprocessor (μP) systems. They significantly improve system reliability and accuracy pared to separate ICs or discrete ponents. These parts provide four functions: 1) A reset output during power-up, power-down, and brownout conditions. 2) Battery-backup switching for CMOS RAM, CMOS μP, or other low-power logic. 3) A reset pulse if the optional watchdog timer has not been toggled within 1.6s. 4) A 1.25V threshold detector for power-fail warning or low-battery detection, or to monitor a power supply other than +5V. The parts differ in their reset-voltage threshold levels and reset outputs. The MAX690A/MAX802L/MAX805L generate a reset pulse when the supply voltage drops below 4.65V, and the MAX692A/MAX802M generate a reset below 4.40V. The MAX802L/MAX802M guarantee power-fail accuracies to ±2%. The MAX805L is the same as the MAX690A except that RESET is provided instead of RESET. All parts are available in 8-pin DIP and SO packages. The MAX690A/MAX802L are pin patible with the MAX690 and MAX694. The MAX692A/MAX802M are pin patible with the MAX692. Applications - - Battery-Powered puters and Controllers - - Intelligent Instruments - - Critical μP Power Monitoring Typical Operating Circuit UNREGULATED DC 0.1µF R1 R2 3.6V LITHIUM BATTERY REGULATED +5V VCC RESET MAX690A PFO MAX802L WDI VBATT VOUT RESET µP NMI I/O LINE GND VCC CMOS RAM GND Features - - Precision Supply Voltage Monitor: 4.65V for MAX690A/MAX802L/MAX805L 4.40V for MAX692A/MAX802M - - Reset Time Delay: 200ms - - Watchdog Timer: 1.6s Timeout - - Battery-Backup Power Switching - - 200μA Quiescent Supply Current - - 50n A Quiescent Supply Current in Battery Backup Mode - - Voltage Monitor for Power-Fail or Low-Battery Warning - - Power-Fail Accuracy Guaranteed to ±2% (MAX802L/M) - - Guaranteed RESET Assertion to VCC = 1V - - 8-Pin...