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AutomaTIc Battery Back-Up SwitchThe Intersil ICL7673 is a monolithic CMOS battery backupcircuit that offers unique performance advantages overconvenTIonal means of switching to a backup supply. TheICL7673 is intended as a low-cost soluTIon for the switchingof systems between two power supplies; main and batterybackup. The main applicaTIon is keep-alive-battery powerswitching for use in volatile CMOS RAM memory systemsand real time clocks. In many applications this circuit willrepresent a low insertion voltage loss between the suppliesand load. This circuit features low current consumption, wideoperating voltage range, and exceptionally low leakagebetween inputs. Logic outputs are provided that can be usedto indicate which supply is connected and can also be usedto increase the power switching capability of the circuit bydriving external PNP transistors.
