UPD4990A Datasheet, PDF (1/20 Pages) NEC – SERIAL I/O CALENDAR & CLOCK CMOS LSI

DATA SHEET
MOS INTEGRATED CIRCUIT
µPD4990A
SERIAL I/O CALENDAR & CLOCK
CMOS LSI
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
• 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.
ORDERING INFORMATION
PART No.
µPD4990AC
µPD4990AG
PACKAGE
14-pin plastic DIP (300 mil)
16-pin plastic SOP (300 mil)
CONNECTION DIAGRAM (Top View)
C2 1
14 VDD (+)
C1 2
13 XTAL
C0 3
12 XTAL
STB 4
11 OUT ENBL
CS 5
10 TP
DATA IN 6
9 DATA OUT
GND 7
(VSS)
8 CLK
µ PD4990AC
C2 1
16 VDD (+)
C1 2
15 XTAL
C0 3
14 XTAL
NC 4
13 NC
STB 5
12 OUT ENBL
CS 6
11 TP
DATA IN 7
10 DATA OUT
GND 8
(VSS)
9 CLK
µ PD4990AG
NC: NO CONNECTION
Document No. IC-1755 (1st edition)
Date Published March 1997 P
Printed in Japan
©
1989