4-BIT PARALLEL I/O CALENDAR CLOCK

The UPD4991A is a CMOS integrated circuit that has the ability to input/output 4-bit parallel time data and calendar data to/from a microcomputer and includes an alarm function. By NEC Electronics Inc.
UPD4991A 's PackagesUPD4991A 's pdf datasheet



UPD4991A Pinout will be updated soon..., now you can download the pdf datasheet to check the pinouts !
UPD4991A circuits will be updated soon..., now you can download the pdf datasheet to check the circuits!

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