Automatic CMOS Battery Back-Up Switch 8-Pin Metal Can The Intersil ICL7673 is a monolithic CMOS battery backup circuit that offers unique performance advantages over conventional means of switching to a backup supply. The ICL7673 is intended as a low-cost solution for the switching of systems between two power supplies; main and battery backup. Features Automatically connects output to the greater of either input supply voltage If main power to external equipment is lost, circuit will automatically connect battery backup Reconnects main power when restored Logic indicator signaling status of main power Low impedance connection switches Low internal power consumption Wide supply range: 2.5V to 15V Low leakage between inputs External transistors may be added if very large currents need to be switched Applications On board battery backup for real-time clocks, timers, or volatile RAMs Over/under voltage detector Peak voltage detector Portable instruments, portable telephones, line operated equipment
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