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參數資料
| 型號： | UPD4991A |
| 廠商： | NEC Corp. |
| 英文描述： | 4-BIT PARALLEL I/O CALENDAR CLOCK |
| 中文描述： | 4位并行I / O日歷鐘 |
| 文件頁數： | 1/32頁 |
| 文件大小： | 133K |
| 代理商： | UPD4991A |
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1995
DATA SHEET
The
μ
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
μ
PD4991A consumes 30 % less power than the
μ
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
μ
PD4991
Low power consumption: 2
μ
A typ. (V
DD
= 2.4 V)
ORDERING INFORMATION:
Part Number
Package
μ
PD4991ACX
18-pin plastic DIP (300 mil)
μ
PD4991AGS
20-pin plastic SOP (300 mil)
μ
PD4991A
MOS INTEGRATED CIRCUIT
4-BIT PARALLEL I/O CALENDAR CLOCK
Document No. IC-3309 (1st edition)
(O.D. No. IC-7892A)
Date Published March 1997 P
Printed in Japan
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