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參數(shù)資料
| 型號(hào)： | UPD4990AC-A |
| 元件分類： | 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDIP14 |
| 封裝： | DIP-14 |
| 文件頁(yè)數(shù)： | 48/51頁(yè) |
| 文件大小： | 211K |
| 代理商： | UPD4990AC-A |
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1
CHAPTER 1 INTRODUCTION
The
PD4990A is a CMOS LSI developed to input/output calendar and clock data serially to/from the micro-
computer system.
The including data items are hour, minute, second, year, month, day, and day of week.
Data format is BCD except month. Data format of month is hexadecimal (1 ~ 0 CH).
The
PD4990A is useful for personal computer, electronic cash register, photo-copier, facsimile etc. what require
calendar and clock data.
1.1 FEATURE
(1) Calendar (year, month, day, day of week) & clock (hour, minute, second) data.
(2) Leap years are determined automatically.
(3) Data format is BCD (only month is hexadecimal).
(4) TP output selectable
Timing pulse is 64, 256, 2048 or 4096 Hz
Interval timer is 1, 10, 30 or 60 sec.
(5) Wide operating supply voltage 2.0 – 5.5 V
The
PD4990A can use dry battery, Ni-Cd battery etc.
(6) Data input/output is serially by external clock.
(7) The crystal frequency is 32.768 kHz
(8) CMOS structure
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