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参数资料
| 型号： | DS1742W-150+ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | XO, clock |
| 英文描述： | Y2KC Nonvolatile Timekeeping RAM |
| 中文描述： | 0 TIMER(S), REAL TIME CLOCK, PDIP24 |
| 封装： | 0.740 INCH, ROHS COMPLIANT, ENCAPSULATED, DIP-24 |
| 文件页数： | 10/16页 |
| 文件大小： | 272K |
| 代理商： | DS1742W-150+ |
DS1742
3 of 16
CLOCK OPERATIONS—READING THE CLOCK
While the double-buffered register structure reduces the chance of reading incorrect data,
internal updates to the DS1742 clock registers should be halted before clock data is read to
prevent reading of data in transition. However, halting the internal clock register updating
process does not affect clock accuracy. Updating is halted when a 1 is written into the read bit,
bit 6 of the century register, see Table 2. As long as a 1 remains in that position, updating is
halted. After a halt is issued, the registers reflect the count, that is day, date, and time that was
current at the moment the halt command was issued. However, the internal clock registers of
the double-buffered system continue to update so that the clock accuracy is not affected by the
access of data. All of the DS1742 registers are updated simultaneously after the internal clock
register updating process has been re-enabled. Updating is within a second after the read bit is
written to 0. The READ bit must be a zero for a minimum of 500
s to ensure the external
registers will be updated.
Figure 1. DS1742 BLOCK DIAGRAM
Table 1. TRUTH TABLE
VCC
CE
OE
WE
MODE
DQ
POWER
VIH
X
Deselect
High-Z
X
Standby
VIL
X
VIL
Write
Data In
Active
VIL
VIH
Read
Data Out
Active
VCC > VPF
VIL VIH
VIH
Read
High-Z
Active
VSO < VCC < VPF
Deselect
CMO
dby
X
High-Z
S Stan
VCC < VSO < VPF
X
Deselect
High-Z
Data Retention Mode
相关PDF资料 |
PDF描述 |
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| DS1743-100+ | Y2K-Compliant, Nonvolatile Timekeeping RAMs |
| DS1743-100IND+ | Y2K-Compliant, Nonvolatile Timekeeping RAMs |
| DS1743-85+ | Y2K-Compliant, Nonvolatile Timekeeping RAMs |
| DS1743-85IND+ | Y2K-Compliant, Nonvolatile Timekeeping RAMs |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1742W-150+ | 功能描述:实时时钟 Timekeeping NV RAM 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 |
| DS1743 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Y2K-Compliant, Nonvolatile Timekeeping |
| DS1743-100 | 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 |
| DS1743-100 IND | 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 |
| DS1743-100+ | 功能描述:实时时钟 Timekeeping NV RAM 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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