LTC691CN Datasheet PDF - Linear Technology

●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