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参数资料
| 型号： | DS1743P-70 |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | Timer or RTC |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
| 封装： | POWERCAP MODULE-34 |
| 文件页数： | 15/19页 |
| 文件大小： | 379K |
| 代理商： | DS1743P-70 |
DS1743/DS1743P Y2K-Compliant, Nonvolatile Timekeeping RAMs
5 of 16
Figure 1. Block Diagram
Table 1. Truth Table
VCC
CE
CE2
OE
WE
MODE
DQ
POWER
VIH
X
Deselect
High-Z
Standby
X
VIL
X
Deselect
High-Z
Standby
VIL
VIH
X
VIL
Write
Data In
Active
VIL
VIH
VIL
VIH
Read
Data Out
Active
VCC > VPF
VIL
VIH
Read
High-Z
Active
VSO < VCC < VPF
X
Deselect
High-Z
CMOS Standby
VCC<VSO<VPF
X
Deselect
High-Z
Data-Retention
Mode
SETTING THE CLOCK
As shown in Table 2, bit 7 of the century register is the write bit. Setting the write bit to a 1, like the read
bit, halts updates to the DS1743 registers. The user can then load them with the correct day, date and time
data in 24-hour BCD format. Resetting the write bit to a 0 then transfers those values to the actual clock
counters and allows normal operation to resume.
STOPPING AND STARTING THE CLOCK OSCILLATOR
The clock oscillator may be stopped at any time. To increase the shelf life, the oscillator can be turned off
to minimize current drain from the battery. The
OSC bit is the MSB (bit 7) of the seconds registers, see
Table 2. Setting it to a 1 stops the oscillator.
FREQUENCY TEST BIT
As shown in Table 2, bit 6 of the day byte is the frequency test bit. When the frequency test bit is set to
logic 1 and the oscillator is running, the LSB of the seconds register will toggle at 512Hz. When the
seconds register is being read, the DQ0 line will toggle at the 512Hz frequency as long as conditions for
access remain valid (i.e.,
CE low, OE low, WE high, and address for seconds register remain valid and
stable).
Dallas
Semiconductor
DS1743
相关PDF资料 |
PDF描述 |
|---|---|
| DS1743-70 | 0 TIMER(S), REAL TIME CLOCK, DMA28 |
| DS1743W-120 | 0 TIMER(S), REAL TIME CLOCK, DMA28 |
| DS9034PCX | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
| DS1743-100 | 0 TIMER(S), REAL TIME CLOCK, DMA28 |
| DS1743WP-120 | 0 TIMER(S), REAL TIME CLOCK, DMA34 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1743P-70+ | 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 |
| DS1743P-85+ | 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 |
| DS1743P-85IND+ | 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 |
| DS1743P-C01+ | 制造商:Maxim Integrated Products 功能描述:Y2KC RAM PCAP 8KX8 100NS ROCKWELL - Trays |
| DS1743W-120 | 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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