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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： | 1/19页 |
| 文件大小： | 584K |
| 代理商： | DS12887 |
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110899
FEATURES
§ Drop–in replacement for IBM AT computer
clock/calendar
§ 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 compensation 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 ms to 500 ms
–
End of clock update cycle
PIN ASSIGNMENT
PIN DESCRIPTION
AD0–AD7
– Multiplexed Address/Data Bus
NC
– No Connection
MOT
– Bus Type Selection
CS
– Chip Select
AS
– Address Strobe
R/ W
– Read/Write Input
DS
– Data Strobe
RESET
– Reset Input
IRQ
– Interrupt Request Output
SQW
– Square Wave Output
VCC
– +5 Volt Supply
GND
– Ground
DESCRIPTION
The DS12887 Real Time Clock plus RAM is designed to be a direct replacement for the DS1287. The
DS12887 is identical in form, fit, and function to the DS1287, 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 DS12887 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
NC
DS12887
Real Time Clock
www.dalsemi.com
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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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