LTC690IS8

Typical applications

description

Devices in H (metal round cap), J (ceramic), and K (metal round cap) packages offered by Linear Technology are now discontinued.

LTC^®The 690 Series provides complete power monitoring and battery control for microprocessor reset, battery backup, CMOS RAM write protection, power failure alarm, and watchdog timing. A precision internal voltage reference and comparator circuit monitors the power lines. When an out-of-tolerance condition occurs, the reset output is forced to an operating state, and the chip-enable output is unconditionally write-protected to external memory. furthermoreRESETThe output is guaranteed to be logic low, even if V_CCAs low as 1V is no exception.

The LTC690 family utilizes a charge-pump NMOS power switch to power active CMOS RAM and is designed for low dropout and low supply current. When main power is lost, the standby RAM is powered by an auxiliary power supply (connected to the battery input pin) through a high-efficiency PMOS switch.

To provide early warning of impending power failure, the LTC690 family provides an internal comparator with user-defined thresholds. An internal watchdog timer is also provided that forces a reset pin to enter the operating state when the watchdog input is not transformed before a preset timeout period.