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參數(shù)資料
| 型號： | DS1287A |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | XO, clock |
| 英文描述： | Real Time Clock(實時時鐘) |
| 中文描述： | 1 TIMER(S), REAL TIME CLOCK, PDIP19 |
| 文件頁數(shù)： | 1/1頁 |
| 文件大?。?/td> | 20K |
| 代理商： | DS1287A |
DS1287A
Real Time Clock
DS1287A
022798 1/1
FEATURES
Drop-in replacement for IBM AT computer clock/ca-
lendar
Pin compatible with the MC146818A
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, day of the week,
date, month, and year with leap year compensation
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 64 RAM locations
– 14 bytes of clock and control registers
– 50 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 500 ms
– End of clock update cycle
PIN ASSIGNMENT
24 PIN ENCAPSULATED PACKAGE
V
CC
SQW
NC
RCLR
NC
IRQ
RESET
DS
NC
R/W
AS
CS
MOT
NC
NC
AD0
AD1
AD2
AD3
AD4
AD5
AD6
AD7
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
PIN DESCRIPTION
AD0–AD7
NC
MOT
CS
AS
R/W
DS
RESET
IRQ
drain)
SQW
V
CC
GND
RCLR
-
-
-
-
-
-
-
-
-
Multiplexed address/data bus
No connection
Bus type selection
Chip select
Address strobe
Read/write input
Data strobe
Reset input
Interrupt request output (open
-
-
-
-
Square wave output
+5 volt supply
Ground
RAM clear
DESCRIPTION
The DS1287A is identical to the DS1287 with the addi-
tion of the RAM clear pin. For a complete description of
operating conditions, electrical and mechanical charac-
teristics, bus timing, and pin descriptions see the
DS12887A data sheet.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS1287 | Real Time Clock(實時時鐘) |
| DS12885 | Real Time Clock(實時時鐘) |
| DS12885Q | Real Time Clock(實時時鐘) |
| DS12885T | Real Time Clock(實時時鐘) |
| DS1312 | Nonvolatile Controller with Lithium Battery Monitor(帶鋰電池監(jiān)控的非易失性控制器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS12885 | 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS12885+ | 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS12885N | 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS12885N+ | 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS12885Q | 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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