- 您現在的位置：買賣IC網 > PDF目錄376950 > DS12C887A Real-Time Clock PDF資料下載
參數資料
| 型號： | DS12C887A |
| 英文描述： | Real-Time Clock |
| 中文描述： | 實時時鐘 |
| 文件頁數： | 1/2頁 |
| 文件大小： | 83K |
| 代理商： | DS12C887A |
1 of 2
111901
FEATURES
Drop-in replacement for IBM AT computer
clock/calendar
Pin compatible with the MC146818B and
DS1287A
Totally nonvolatile with over 10 years of
operation in the absence of power
Self-contained subsystem includes lithium,
quartz, and support circuitry
Counts seconds, minutes, hours, days, day of
the week, date, month, and year with leap-
year compensation valid up to 2100
Binary or BCD representation of time,
calendar, and alarm
12- or 24-hour clock with AM and PM in 12-
hour mode
Daylight Savings Time option
Selectable between Motorola and Intel bus
timing
Multiplex bus for pin efficiency
Interfaced with software as 128 RAM
locations
– 15 bytes of clock and control registers
– 113 bytes of general purpose RAM
Programmable square-wave output signal
Bus-compatible interrupt signals (IRQ)
Three interrupts are separately software-
maskable and testable
– Time-of-day alarm once/second to
once/day
– Periodic rates from 122 s to 500ms
– En-of-clock update cycle
Century register
PIN ASSIGNMENT
PIN DESCRIPTION
AD0–AD7 - Multiplexed Address/Data Bus
NC
- No Connect
MOT
- Bus Type Selection
- RTC Chip Select Input
AS
- Address Strobe
R/
W
- Read/Write Input
DS
- Data Strobe
- Reset Input
- Interrupt Request Output
SQW
- Square-Wave Output
V
CC
- +5V Main Supply
RCLR
- RAM Clear
GND
- Ground
CS
RESET
IRQ
DESCRIPTION
The DS12C887A real-time clock plus RAM is designed to be a direct upgrade replacement for the
DS12887A in existing IBM-compatible personal computers to add hardware year-2000 compliance. A
century byte was added to memory location 50, 32h, as called out by the PC AT specification. The
DS12C887A is identical in form, fit, and function to the DS1287A, and provides additional 64 bytes of
general-purpose RAM. Access to this additional RAM space is determined by the logic level presented on
AD6 during the address portion of an access cycle. The
RCLR
pin is used to clear (set to logic 1) all 113
bytes of general purpose RAM but does not affect the RAM associated with the real time clock. In order
DS12C887A
Real-Time Clock
www.maxim-ic.com
MOT
NC
1
2
3
4
5
6
7
8
9
10
11
12
23
22
21
20
19
18
17
16
15
14
13
DS12C887A
24-Pin Encapsulated Package
NC
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
GND
V
CC
SQW
NC
NC
IRQ
RESET
DS
NC
R/W
AS
CS
24
RCLR
相關PDF資料 |
PDF描述 |
|---|---|
| DS12C887 | Real Time Clock |
| DS1300-3 | 1300 Watts 12V Distributed Power System |
| DS1301-7R | 100 Watt DC-DC Converters |
| DS1001-7R | RECTIFIER BRIDGE 1A 600V DB-1 |
| DS1601-7R | 100 Watt DC-DC Converters |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DS12C887A+ | 功能描述:實時時鐘 RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS12CR887-33 | 功能描述:實時時鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS12CR887-33+ | 功能描述:實時時鐘 RTC w/Constant V Trickle Charger RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS12CR887-5 | 功能描述:實時時鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS12CR887-5+ | 功能描述:實時時鐘 RTC w/Constant V Trickle Charger RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
發布緊急采購，3分鐘左右您將得到回復。