The Intersil ICL7665IJA is a voltage monitor / MPU supervisor IC — the kind of part that sits on a power rail and holds a microcontroller in reset until the supply is stable. It is the sort of component you find on industrial control boards, telecom line cards, or any embedded system where the processor needs a clean power-on sequence and a watchdog against brownout conditions.
The part is marked RoHS non-compliant. This restricts use in lead-free assembly lines.
Because the ICL7665IJA is Active and RoHS non-compliant, it is not a part every distributor stocks.