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参数资料
| 型号： | DS1643-85+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/17页 |
| 文件大小： | 0K |
| 描述： | IC RAM TIMEKEEP NV 85NS 28-EDIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 14 |
| 类型： | 时钟/日历 |
| 特点： | 闰年，NVSRAM |
| 存储容量： | 8KB |
| 时间格式： | HH:MM:SS（24 小时） |
| 数据格式： | YY-MM-DD-dd |
| 接口： | 并联 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 28-DIP 模块（0.600"，15.24mm） |
| 供应商设备封装： | 28-EDIP |
| 包装： | 盒 |
DS1643/DS1643P
4 of 17
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
5V
10%
VIL
VIH
Read
High-Z
Active
<4.5V >
VBAT
X
Deselect
High-Z
CMOS Standby
<VBAT
X
Deselect
High-Z
Data Retention Mode
SETTING THE CLOCK
The 8-bit of the control register is the write bit. Setting the write bit to a 1, like the read bit, halts updates
to the DS1643 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 for the seconds registers. Setting it to
a 1 stops the oscillator.
FREQUENCY TEST BIT
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, CE2 high, and address for seconds register remain valid and stable).
DS1643/
DS1643P
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1643-85+ | 功能描述:实时时钟 NV Timekeeping 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 |
| DS1643AL-12 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Real-Time Clock |
| DS1643AL-120 | 功能描述:IC RAM TIMEKEEP NV 120NS 34-LPM RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 实时时钟 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 类型:时钟/日历 特点:警报器，闰年，SRAM 存储容量:- 时间格式:HH:MM:SS（12/24 小时） 数据格式:YY-MM-DD-dd 接口:SPI 电源电压:2 V ~ 5.5 V 电压 - 电源，电池:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WDFN 裸露焊盘 供应商设备封装:8-TDFN EP 包装:管件 |
| DS1643AL-15 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Real-Time Clock |
| DS1643C02 | 制造商:Maxim Integrated Products 功能描述:- Bulk |
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