- 您现在的位置：买卖IC网 > PDF目录295504 > DS1747-70+ (MAXIM INTEGRATED PRODUCTS INC) Y2K-Compliant, Nonvolatile Timekeeping RAMs PDF资料下载
参数资料
| 型号： | DS1747-70+ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | XO, clock |
| 英文描述： | Y2K-Compliant, Nonvolatile Timekeeping RAMs |
| 中文描述： | 0 TIMER(S), REAL TIME CLOCK, PDIP32 |
| 封装： | 0.740 INCH, ROHS COMPLIANT, EDIP-32 |
| 文件页数： | 11/16页 |
| 文件大小： | 207K |
| 代理商： | DS1747-70+ |
DS1747/DS1747P Y2K-Compliant, Nonvolatile Timekeeping RAMs
4 of 16
Figure 1. Block Diagram
PACKAGES
The DS1747 is available in two packages (32-pin DIP and 34-pin PowerCap module). The 32-pin DIP
style module integrates the crystal, lithium energy source, and silicon all in one package. The 34-pin
PowerCap Module Board is designed with contacts for connection to a separate PowerCap
(DS9034PCX) that contains the crystal and battery. This design allows the Power-Cap to be mounted on
top of the DS1747P after the completion of the surface mount process. Mounting the PowerCap after the
surface mount process prevents damage to the crystal and battery due to the high temperatures required
for solder reflow. The PowerCap is keyed to prevent reverse insertion. The PowerCap Module Board
and PowerCap are ordered separately and shipped in separate containers. The part number for the
PowerCap is DS9034PCX.
TIME AND DATE OPERATIONS
The contents of the time and date registers are in BCD format. The day-of-week register increments at
midnight. Values that correspond to the day of week are user-defined, but must be sequential (i.e., if 1
equals Sunday, then 2 equals Monday and so on). Illogical time and date entries result in undefined
operation.
CLOCK OPERATIONS—READING THE CLOCK
While the double-buffered register structure reduces the chance of reading incorrect data, internal
updates to the DS1747 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 one is written into the read bit, bit 6 of the century register (see
Table 2). As long as a one 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 the DS1747 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 zero. The READ bit must be set to a zero for a minimum of
500
s to ensure the external registers will be updated.
Maxim
DS1747
相关PDF资料 |
PDF描述 |
|---|---|
| DS17885N-3 | 1 TIMER(S), REAL TIME CLOCK, PDIP24 |
| DS1806S-050-IND | 50K DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 64 POSITIONS, PDSO20 |
| DS1845X-010 | 10K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, UUC14 |
| DS1845X-100 | 100K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, UUC14 |
| DS1866N | DIGITAL POTENTIOMETER, 3-WIRE SERIAL CONTROL INTERFACE, 64 POSITIONS, PDIP8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1747-70+ | 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 |
| DS1747-70IND | 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 |
| DS1747-70IND+ | 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 |
| DS1747-70IND-W | 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 |
| DS1747-DS1747P | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Y2K-Compliant, Nonvolatile Timekeeping RAMs |
发布紧急采购，3分钟左右您将得到回复。