DESCRIPTION
●The LTC®690 family provides complete power supply monitoring and battery control functions for microprocessor reset, battery back-up, CMOS RAM write protection, power failure warning and watchdog timing. A precise internal voltage reference and comparator circuit monitor the power supply line. When an out-of-tolerance condition occurs, the reset outputs are forced to active states and the chip enable output unconditionally write-protects external memory. In addition, the RESET output is guaranteed to remain logic low even with VCC as low as 1V.
●FEATURES
●■ Guaranteed Reset Assertion at VCC = 1V
●■ 1.5mA Maximum Supply Current
●■ Fast (35ns Max) Onboard Gating of RAM Chip Enable Signals
●■ SO-8 and S16 Packaging
●■ 4.65V Precision Voltage Monitor
●■ Power OK/Reset Time Delay: 50ms, 200ms or Adjustable
●■ Minimum External Component Count
●■ 1µA Maximum Standby Current
●■ Voltage Monitor for Power-Fail or Low-Battery Warning
●■ Thermal Limiting
●■ Performance Specifi ed Over Temperature
●■ Superior Upgrade for MAX690 Family
●APPLICATIONS
●■ Critical μP Power Monitoring
●■ Intelligent Instruments
●■ Battery-Powered Computers and Controllers
●■ Automotive Systems
