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UPD4991A

Part Number	UPD4991A
Manufacturer	NEC
Description	4-BIT PARALLEL I/O CALENDAR CLOCK
Published	Apr 17, 2005
Detailed Description	DATA SHEET MOS INTEGRATED CIRCUIT µPD4991A 4-BIT PARALLEL I/O CALENDAR CLOCK The µPD4991A is a CMOS integrated circui...
Datasheet	UPD4991A PDF File

Overview

DATA SHEET MOS INTEGRATED CIRCUIT µPD4991A 4-BIT PARALLEL I/O CALENDAR CLOCK The µPD4991A 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.
Its reference oscillation frequency is 32.
768 kHz.
Hour, minute, second, year, month, day, and date data is stored internally.
The µPD4991A consumes 30 % less power than the µPD4991.
FEATURES: • Time (hour, minute, and second) and calendar (leap year, year, month, day, and date) counters • Leap year can be automatically identified or set • 12- and 24-hour modes selectable • 4-bit parallel input/output in BCD data format • Alarm function ...

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