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参数资料
| 型号： | DS12887 |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | Timer or RTC |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| 封装： | DIP-24 |
| 文件页数： | 12/19页 |
| 文件大小： | 584K |
| 代理商： | DS12887 |
DS12887
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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 VCC input. When VCC 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 VCC 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 VCC falls below a level of approximately
3 volts, the external VCC supply is switched off and an internal lithium energy source supplies power to
the Real Time Clock and the RAM memory.
SIGNAL DESCRIPTIONS
GND, VCC – DC power is provided to the device on these pins. VCC 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 VCC is
below 4.25 volts typical, reads and writes are inhibited. However, the timekeeping function continues
相关PDF资料 |
PDF描述 |
|---|---|
| DS1302S | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| DS1302N | 0 TIMER(S), REAL TIME CLOCK, PDIP8 |
| DS1302SN | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| DS1302 | 0 TIMER(S), REAL TIME CLOCK, PDIP8 |
| DS1302Z | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS12887+ | 功能描述:实时时钟 RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS12887A | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS12887A+ | 功能描述:实时时钟 RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1290 | 功能描述:计数器移位寄存器 RoHS:否 制造商:Texas Instruments 计数器类型: 计数顺序:Serial to Serial/Parallel 电路数量:1 封装 / 箱体:SOIC-20 Wide 逻辑系列: 逻辑类型: 输入线路数量:1 输出类型:Open Drain 传播延迟时间:650 ns 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装:Reel |
| DS12C887 | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
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