UPD4991A PDF Download

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UPD4991AGS-A

Programmable Timer, 5 Timer(s), CMOS, PDSO20

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Description

This is 4-BIT PARALLEL I/O CALENDAR CLOCK. DATA SHEET MOS INTEGRATED CIRCUIT PD4991A 4-BIT PARALLEL I, O CALENDAR CLOCK The PD4991A 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 PD4991A consumes 30 % less power than the PD4991. 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 (hour, minute, second, month, day, date) One of 0.1, 1.0, 10, 30, and 60-s interval timer outputs selectable One of 2048, 1024, 64, 16, 1 Hz, 1-pulse output, and H→L output selectable as alarm coincidence output Upward compatible with PD4991 Low power consumption: 2 A typ. (VDD = 2.4 V.

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