UPD4990A - SERIAL I/O CALENDAR & CLOCK CMOS LSI

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NEC

Part number	UPD4990A
Manufacturer	NEC
File Size	129.98 KB
Description	SERIAL I/O CALENDAR & CLOCK CMOS LSI
Datasheet	UPD4990A Datasheet
Additional preview pages of the UPD4990A datasheet.

Built-in counters for time (hour, minute, and second) and date (year, month, day, and week) Leap years are adjusted automatically. Data is represented in BCD notation (except months in hexadecimal notation) and input/output serially. Commands can be set by inputting serial data. Selective timing pulses (TPs) are 64 Hz, 256 Hz, 2 048 Hz, and 4 096 Hz and selective output intervals are 1, 10, 30, and 60 seconds.

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Published: Apr 17, 2005 |