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參數資料
| 型號： | DS12885 |
| 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, PDIP24 |
| 封裝： | DIP-24 |
| 文件頁數： | 1/6頁 |
| 文件大小： | 119K |
| 代理商： | DS12885 |
DS12885, DS12885Q, DS12885T
Real Time Clock
DS12885, DS12885Q, DS12885T
022798 1/6
FEATURES
Drop–in replacement for IBM AT computer clock/ca-
lendar
Pin configuration closely matches MC146818B and
DS1285
Counts seconds, minutes, hours, days, day of the
week, date, month, and year with leap year compen-
sation 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
- 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
Optional 28–pin PLCC surface mount package or
32–pin TQFP
Optional industrial temperature range available
DESCRIPTION
The DS12885 Real Time Clock plus RAM is designed to
be a direct replacement for the DS1285. The DS12885
is identical in form, fit, and function to the DS1285, and
has an additional 64 bytes of general purpose RAM. Ac-
cess to this additional RAM space is determined by the
logic level presented on AD6 during the address portion
of an access cycle. An external crystal and battery are
the only components required to maintain time–of–day
and memory status in the absence of power. For a com-
plete description of operating conditions, electrical
characteristics, bus timing, and pin descriptions other
than X1, X2, V
BAT
, and RCLR, see the DS12887 data
sheet.
PIN ASSIGNMENT
RESET
DS
GND
IRQ
NC
V
BAT
RCLR
NC
DDS12885 24–PIN DIP
V
CC
SQW
NC
RCLR
V
BAT
IRQ
RESET
DS
GND
R/W
AS
CS
MOT
X1
X2
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
4
3 2
1
RCLR
V
BAT
IRQ
RESET
DS
GND
R/W
28 27 26
25
24
23
22
21
20
19
DS12885Q
28–PIN PLCC
X
M
N
V
S
N
X
A
A
G
C
A
N
12 13 14 1516 17 18
AD0
AD1
AD2
AD3
AD4
AD5
NC
5
6
7
8
9
10
11
N
AD0
AD1
AD2
NC
AD3
NC
AD4
AD5
A
N
A
G
C
A
N
R
N
X
X
M
V
N
S
N
3DS12885T
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15 16
24
23
22
21
20
19
18
17
32 31 30 29 28 27 26 25
相關PDF資料 |
PDF描述 |
|---|---|
| DS12885Q | Real Time Clock(實時時鐘) |
| DS12885T | Real Time Clock(實時時鐘) |
| DS1312 | Nonvolatile Controller with Lithium Battery Monitor(帶鋰電池監控的非易失性控制器) |
| DS1314 | 3V Nonvolatile Controller with Lithium Battery Monitor(帶鋰電池監控的3V非易失性控制器) |
| DS1315 | Phantom Time Chip(幻影時間芯片) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS12885Q/T&R | 制造商:Rochester Electronics LLC 功能描述: 制造商:DSC 功能描述: |
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