©

1989

DATA SHEET

MOS INTEGRATED CIRCUIT

The

µPD4990A is a CMOS LSI developed to input/output calendar & clock data serially to/from the micro computer.

The crystal frequency is 32.768 kHz and the data items included are time, minute, second, year, month, day, and

week.

FEATURES

30, and 60 seconds.

ORDERING INFORMATION

PART No.

PACKAGE

µPD4990AC

14-pin plastic DIP (300 mil)

µPD4990AG

16-pin plastic SOP (300 mil)

CONNECTION DIAGRAM (Top View)

Document No. IC-1755 (1st edition)

Date Published March 1997 P

Printed in Japan

SERIAL I/O CALENDAR & CLOCK

CMOS LSI

114

213

312

411

510

69

7

STB

CS

DATA IN

GND

OUT ENBL

TP

DATA OUT

CLK

PD4990AC

µ

8

116

215

314

413

512

611

7

NC

STB

CS

DATA IN

NC

OUT ENBL

TP

DATA OUT

PD4990AG

NC: NO CONNECTION

µ

10

89

GND

CLK