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D4991

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D4991 数据手册

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 (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 µPD4991

Low power consumption: 2 µA typ. (VDD = 2.4 V)

ORDERING INFORMATION:

Part Number

Package

µPD4991ACX

µPD4991AGS

18-pin plastic DIP (300 mil)

20-pin plastic SOP (300 mil)

Document No. IC-3309 (1st edition)

(O.D. No. IC-7892A)

Date Published March 1997 P

Printed in Japan

1995

1993

12 3 4 5 6 7...32

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