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參數(shù)資料
| 型號(hào)： | DS12885 |
| 廠(chǎng)商： | DALLAS SEMICONDUCTOR |
| 元件分類(lèi)： | XO, clock |
| 英文描述： | Real Time Clock(實(shí)時(shí)時(shí)鐘) |
| 中文描述： | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| 封裝： | DIP-24 |
| 文件頁(yè)數(shù)： | 2/6頁(yè) |
| 文件大?。?/td> | 119K |
| 代理商： | DS12885 |
DS12885, DS12885Q, DS12885T
022798 2/6
PIN DESCRIPTION
AD0–AD7
NC
MOT
CS
AS
R/W
DS
RESET
IRQ
drain)
SQW
V
cc
GND
X1,X2
V
BAT
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
– 32.768 kHz Crystal Connections
– +3 volt Battery Input
– RAM Clear
PIN DESCRIPTION
X1, X2
–
Connections for a standard 32.768 kHz quartz
crystal. The internal oscillator circuitry is designed for
operation with a crystal having a specified load capaci-
tance (CL) of 6 pF. The crystal is connected directly to
the X1 and X2 pins. There is no need for external capac-
itors or resistors. Note: X1 and X2 are very high imped-
ance nodes. It is recommended that they and the crystal
be guard–ringed with ground and that high frequency
signals be kept away from the crystal area. For more
information on crystal selection and crystal layout con-
siderations, please consult Application Note 58, “Crys-
tal Considerations with Dallas Real Time Clocks”.
V
BAT
–
Battery input for any standard 3 volt lithium cell or
other energy source. Battery voltage must be held be-
tween 2.5 and 4 volts for proper operation. A maximum
load of 0.5
μ
A at 25
°
C in the absence of power should be
used to size the external energy source.
The battery should be connected directly to the V
BAT
pin. A diode must not be placed in series with the battery
to the V
BAT
pin. Furthermore, a diode is not necessary
because reverse charging current protection circuitry is
provided internal to the device and has passed the
requirements of Underwriters Laboratories for UL
listing.
RCLR –
The RCLR pin is used to clear (set to logic 1) all
114 bytes of general purpose RAM but does not affect
the RAM associated with the real time clock. In order to
clear the RAM, RCLR must be forced to an input logic
“0” (–0.3 to +0.8 volts) during battery back–up mode
when V
CC
is not applied. The RCLR function is de-
signed to be used via human interface (shorting to
ground manually or by switch) and not to be driven with
external buffers. This pin is internally pulled up. Do not
use an external pull–up resistor on this pin.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS12885Q | Real Time Clock(實(shí)時(shí)時(shí)鐘) |
| DS12885T | Real Time Clock(實(shí)時(shí)時(shí)鐘) |
| DS1312 | Nonvolatile Controller with Lithium Battery Monitor(帶鋰電池監(jiān)控的非易失性控制器) |
| DS1314 | 3V Nonvolatile Controller with Lithium Battery Monitor(帶鋰電池監(jiān)控的3V非易失性控制器) |
| DS1315 | Phantom Time Chip(幻影時(shí)間芯片) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS12885+ | 功能描述:實(shí)時(shí)時(shí)鐘 RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線(xiàn)接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(shí)時(shí)時(shí)鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線(xiàn)接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(shí)時(shí)時(shí)鐘 RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線(xiàn)接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(shí)時(shí)時(shí)鐘 RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線(xiàn)接口:I2C 日期格式:DW:DM:M:Y 時(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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/T&R | 制造商:Rochester Electronics LLC 功能描述: 制造商:DSC 功能描述: |
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