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LTC691 Datasheet Microprocessor Supervisory Circuits

Manufacturer: Linear Technology (now Analog Devices)

Download the LTC691 datasheet PDF. This datasheet also includes the LTC691-LTC690 variant, as both parts are published together in a single manufacturer document.

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General Description

The LTC®690 family, LTC690/LTC691/LTC694/LTC695, provides complete power supply monitoring and battery control functions for microprocessor reset, battery backup, 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.

Key Features

  • n Guaranteed Reset Assertion at VCC = 1V n 1.5mA Maximum Supply Current n Fast (35ns Max) Onboard Gating of RAM Chip Enable Signals n SO-8 and S16 Packaging n 4.65V Precision Voltage Monitor n Power OK/Reset Time Delay: 50ms, 200ms or Adjustable n Minimum External Component Count n 1µA Maximum Standby Current n Voltage Monitor for Power-Fail or Low Battery Warning n Thermal Limiting n Performance Specified Over Temperature n Superior Upgrade for MAX690 Family.

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