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MAX802L：Microprocessor Supervisory Circuits

Industry-Standard, Full-Function uP Supervisor

The MAX690A/MAX692A/MAX802L/MAX802M/MAX805L reduce the complexity and number of components required for power-supply monitoring and battery-control functions in microprocessor (µP) systems. They significantly improve system reliability and accuracy compared to separate ICs or discrete components. 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 1.6sec. 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 active-low RESET. All parts are available in 8-pin DIP and SO packages. The MAX690A/MAX802L are pin compatible with the MAX690 and MAX694. The MAX692A/MAX802M are pin compatible with the MAX692.

Key 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 50nA 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 Active-Low RESET Assertion to VCC = 1V 8-Pin SO and DIP Packages

MAX690A, MAX692A, MAX802L, MAX802M, MAX805L: Typical Operating Circuit Applications/Uses Battery-Powered Computers/Controllers Critical µP Monitoring Intelligent Instruments

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