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參數資料
| 型號： | DS12B887 |
| 英文描述： | Real Time Clock |
| 中文描述： | 實時時鐘 |
| 文件頁數： | 1/16頁 |
| 文件大小： | 102K |
| 代理商： | DS12B887 |
ACopyright 1995 by Dallas Semiconductor Corporation.
DS12B887
Real Time Clock
DS12B887
080895 1/16
FEATURES
Drop-in replacement for IBM AT computer clock/cal-
endar
Pin compatible with the MC146818B and DS1287
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 com-
pensation
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
Multiplex bus for pin efficiency
Interfaced with software as 128 RAM locations
– 14 bytes of clock and control registers
– 114 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
μ
s to 500 ms
– End of clock update cycle
PIN ASSIGNMENT
24 PIN ENCAPSULATED PACKAGE
V
CC
SQW
NC
RCLR
NC
IRQ
NC
DS
NC
R/W
AS
CS
NC
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
CS
AS
R/W
DS
IRQ
SQW
V
CC
GND
RCLR
– Multiplexed Address/Data Bus
– No Connection
– Chip Select
– Address Strobe
– Read/Write Input
– Data Strobe
– Interrupt Request Output
– Square Wave Output
– +5 Volt Supply
– Ground
– RAM Clear
DESCRIPTION
The DS12B887 Real Time Clock plus RAM is designed
to be a direct replacement for the DS1287A or
DS12887A. The DS12B887 is identical in form, fit, and
function to the DS1287A or DS12887A, with the excep-
tion of RCLR, and has an 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. A lithium energy
source, quartz crystal, and write-protection circuitry are
contained within a 24-pin dual in-line package. As such,
the DS12B887 is a complete subsystem replacing 16
components in a typical application. The functions
include a nonvolatile time-of-day clock, an alarm, a one-
hundred-year calendar, programmable interrupt,
square wave generator, and 114 bytes of nonvolatile
static RAM. The real time clock is distinctive in that
time-of-day and memory are maintained even in the
absence of power.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| DS12C887 | 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 |
| DS12C887+ | 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 |
| DS12C887A | 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 |
| 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 |
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