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參數(shù)資料
| 型號： | DS12887 |
| 英文描述： | Real Time Clock |
| 中文描述： | 實時時鐘 |
| 文件頁數(shù)： | 2/19頁 |
| 文件大?。?/td> | 584K |
| 代理商： | DS12887 |
DS12887
2 of 19
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.
OPERATION
The block diagram in Figure 1 shows the pin connections with the major internal functions of the
DS12887. The following paragraphs describe the function of each pin.
BLOCK DIAGRAM DS12887
Figure 1
POWER–DOWN/POWER–UP CONSIDERATIONS
The Real Time Clock function will continue to operate and all of the RAM, time, calendar, and alarm
memory locations remain nonvolatile regardless of the level of the V
CC
input. When V
CC
is applied to the
DS12887 and reaches a level of greater than 4.25 volts, the device becomes accessible after 200 ms,
provided that the oscillator is running and the oscillator countdown chain is not in reset (see Register A).
This time period allows the system to stabilize after power is applied. When V
CC
falls below 4.25 volts,
the chip select input is internally forced to an inactive level regardless of the value of
CS
at the input pin.
The DS12887 is, therefore, write–protected. When the DS12887 is in a write–protected state, all inputs
are ignored and all outputs are in a high impedance state. When V
CC
falls below a level of approximately
3 volts, the external V
CC
supply is switched off and an internal lithium energy source supplies power to
the Real Time Clock and the RAM memory.
SIGNAL DESCRIPTIONS
GND, V
CC
– DC power is provided to the device on these pins. V
CC
is the +5 volt input. When 5 volts are
applied within normal limits, the device is fully accessible and data can be written and read. When V
CC
is
below 4.25 volts typical, reads and writes are inhibited. However, the timekeeping function continues
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS12887+ | 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 |
| DS12887A | 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 |
| DS12887A+ | 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 |
| DS1290 | 功能描述:計數(shù)器移位寄存器 RoHS:否 制造商:Texas Instruments 計數(shù)器類型: 計數(shù)順序:Serial to Serial/Parallel 電路數(shù)量:1 封裝 / 箱體:SOIC-20 Wide 邏輯系列: 邏輯類型: 輸入線路數(shù)量:1 輸出類型:Open Drain 傳播延遲時間:650 ns 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝:Reel |
| 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 |
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