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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)： | 5/17頁 |
| 文件大?。?/td> | 152K |
| 代理商： | DS1743 |
DS1743/DS1743P
052198 5/17
DATA RETENTION MODE
The 5 volt device is fully accessible and data can be writ-
ten or read only when V
CC
is greater than V
PF
. However,
when V
CC
is below the power fail point, V
PF
, (point at
which write protection occurs) the internal clock regis-
ters and SRAM are blocked from any access. At this
time the power fail reset output signal (RST) is driven
active and will remain active until V
CC
returns to nominal
levels. When V
CC
falls below the battery switch point
V
SO
(battery supply level), device power is switched
from the V
CC
pin to the backup battery. RTC operation
and SRAM data are maintained from the battery until
V
CC
is returned to nominal levels.
The 3.3 volt device is fully accessible and data can be
written or read only when V
CC
is greater than V
PF
. When
V
CC
falls below the power fail point, V
PF
, access to the
device is inhibited.
At this time the power fail reset out-
put signal (RST) is driven active and will remain active
until V
CC
returns to nominal levels.
If
V
PF
is less than
V
BAT
, the device power is switched from V
CC
to the
backup supply (V
BAT
) when V
CC
drops below V
PF
. If
V
PF
is greater than V
BAT
, the device power is switched
from V
CC
to the backup supply (V
BAT
) when V
CC
drops
below V
BAT
.
RTC operation and SRAM data are main-
tained from the battery until V
CC
is returned to nominal
levels.
The RST signal is an open drain output and requires a
pull up. Except for the RST, all control, data, and
address signals must be powered down when V
CC
is
powered down.
BATTERY LONGEVITY
The DS1743 has a lithium power source that is de-
signed to provide energy for clock activity, and clock and
RAM data retention when the V
CC
supply is not present.
The capability of this internal power supply is sufficient
to power the DS1743 continuously for the life of the
equipment in which it is installed. For specification pur-
poses, the life expectancy is 10 years at 25
°
C with the
internal clock oscillator running in the absence of V
CC
power. Each DS1743 is shipped from Dallas Semicon-
ductor with its lithium energy source disconnected,
guaranteeing full energy capacity. When V
CC
is first
applied at a level greater than V
PF
, the lithium energy
source is enabled for battery backup operation. Actual
life expectancy of the DS1743 will be much longer than
10 years since no lithium battery energy is consumed
when V
CC
is present.
BATTERY MONITOR
The DS1743 constantly monitors the battery voltage of
the internal battery. The Battery Flag bit (bit 7) of the day
register is used to indicate the voltage level range of the
battery. This bit is not writable and should always be a
one when read. If a zero is ever present, an exhausted
lithium energy source is indicated and both the contents
of the RTC and RAM are questionable.
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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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