LTC691 Datasheet PDF | Linear Technology

Linear Technology LTC691

The LTC690 family powers the active CMOS RAMs with a charge pumped NMOS power switch to achieve low drop out and low supply current. When primary power is lost, auxiliary power, connected to the battery input pin, powers the RAMs in standby through an efficient PMOS switch. For an early warning of impending power failure, the LTC690 family provides an internal comparator with a user-defined threshold.

Part No.	LTC691
Datasheet	LTC691 Download
Manufacturer	Linear Technology
Description	Microprocessor Supervisory Circuits
Buy	Stock & Price

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

APPLICATIONS

n Critical µP Power Monitoring n Intelligent Instruments n Battery-Powered Computers and Controllers n Automotive Systems LTC690/LTC691 LTC694/LTC695 Microprocessor Supervisory Circuits

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.