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參數(shù)資料
| 型號： | UPD4990AC |
| 廠商： | NEC Corp. |
| 英文描述： | SERIAL I/O CALENDAR & CLOCK CMOS LSI |
| 中文描述： | 串行I / O日歷 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大?。?/td> | 129K |
| 代理商： | UPD4990AC |
1989
DATA SHEET
MOS INTEGRATED CIRCUIT
μ
PD4990A
The
μ
PD4990A 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.
μ
PD4990AC
μ
PD4990AG
PACKAGE
14-pin plastic DIP (300 mil)
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
1
14
2
13
3
12
4
11
5
10
6
9
7
C
2
C
1
C
0
STB
CS
DATA IN
GND
(V
SS
)
V
DD
(+)
X
TAL
X
TAL
OUT ENBL
TP
DATA OUT
CLK
PD4990AC
8
1
16
2
15
3
14
4
13
5
12
6
11
7
C
2
C
1
C
0
NC
STB
CS
DATA IN
V
DD
(+)
X
TAL
X
TAL
NC
OUT ENBL
TP
DATA OUT
PD4990AG
NC: NO CONNECTION
10
8
9
GND
(V
SS
)
CLK
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