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參數(shù)資料
| 型號： | DS1743 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Y2KC Nonvolatile Timekeeping RAM(Y2KC非易失性計時RAM) |
| 文件頁數(shù)： | 3/17頁 |
| 文件大?。?/td> | 152K |
| 代理商： | DS1743 |
DS1743/DS1743P
052198 3/17
DS1743 TRUTH TABLE
Table 1
V
CC
CE
CE2
OE
WE
MODE
DQ
POWER
I T l
In Tolerance
V
IH
X
X
X
DESELECT
HIGH–Z
STANDBY
X
V
IL
X
X
DESELECT
HIGH–Z
STANDBY
V
IL
V
IH
X
V
IL
WRITE
DATA IN
ACTIVE
V
IL
V
IH
V
IL
V
IH
READ
DATA OUT
ACTIVE
V
IL
V
IH
V
IH
V
IH
READ
HIGH–Z
ACTIVE
<Tolerance
>V
BAT
X
X
X
X
DESELECT
HIGH–Z
CMOS STANDBY
<V
BAT
X
X
X
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 one, 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 zero
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 in-
crease 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 one 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 512 Hz. When the seconds register is be-
ing read, the DQ0 line will toggle at the 512 Hz 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).
CLOCK ACCURACY (DIP MODULE)
The DS1743 is guaranteed to keep time accuracy to
within
±
1 minute per month at 25
°
C. The clock is cali-
brated at the factory by Dallas Semiconductor using
special calibration nonvolatile tuning elements. The
DS1743 does not require additional calibration and tem-
perature deviations will have a negligible effect in most
applications. For this reason, methods of field clock cal-
ibration are not available and not necessary.
CLOCK ACCURACY (POWERCAP MODULE)
The DS1743P and DS9034PCX are each individually
tested for accuracy. Once mounted together, the mod-
ule is guaranteed to keep time accuracy to within
±
1.53
minutes per month (35 ppm) at 25
°
C.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS1743-100 | 功能描述:實時時鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1743-100 IND | 功能描述:實時時鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1743-100+ | 功能描述:實時時鐘 Timekeeping NV RAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1743-100IND | 功能描述:實時時鐘 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| DS1743-100IND+ | 功能描述:實時時鐘 Timekeeping NV RAM RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
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