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参数资料
| 型号： | M48T18-150MH1TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封装： | 0.330 INCH, SNAPHAT, PLASTIC, SOH-28 |
| 文件页数： | 10/29页 |
| 文件大小： | 184K |
| 代理商： | M48T18-150MH1TR |
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M48T08, M48T18
18/29
Calculating Storage Life
The following formula can be used to predict storage life:
where,
– TA1, TA2, TAN = time at ambient temperature 1, 2, etc.
– TT = total time = TA1+TA2+...+TAN
– SL1, SL2, SLN = storage life at temperature 1, 2, etc.
For example:
An M48T08/18 is exposed to temperatures of 55°C or less for 8322 hrs/yr, and temperatures greater than
60°C but less than 70°C for the remaining 438 hrs/yr. Reading predicted t1% values from Figure 12, page
17,
where,
– SL1 = 41 yrs, SL2 = 11.4 yrs
– TT = 8760 hrs/yr
– TA1 = 8322 hrs/yr, TA2 = 438 hrs/yr
or 36 years.
Cell Capacity Life. The M48T08/18 internal cell
has a rated capacity of 48mAh. The device places
a nominal RAM and TIMEKEEPER load of less
than 520nA on the battery at room temperature. At
this rate, the capacity consumption life is 48E–3/
520E–9 = 96,153 hours or about 10.5 years. Ca-
pacity consumption life can be extended by apply-
ing VCC or turning off the clock oscillator prior to
system power down.
Calculating Capacity Life. The RAM and TIME-
KEEPER load remains relatively constant over the
operating temperature range. Thus, worst-case
cell capacity life is essentially a function of one
variable, VCC duty cycle. For example, if the oscil-
lator runs 100% of the time with VCC applied 60%
of the time, the capacity consumption life is 10/(1–
0.6), or 25 years.
Estimated System Life. Since either storage life
or capacity consumption can end the battery's life,
the system life is marked by which ever occurs
first. In the above example, this would be 25 years.
Reference for System Life. Each M48T08/18 is
marked with a nine digit manufacturing date code
in
the
form of H99XXYYZZ. For example,
H995B9431 is:
H = fabricated in Carrollton, TX,
9 = assembled in Muar, Malaysia,
9 = tested in Muar, Malaysia,
5B = lot designator, and
9431 = assembled in the year 1994, work week 31.
1
TA1
(
[
TT
) SL1 ]
TA2
(
[
TT
) SL2 ]…
TAN
(
TT
) SLN
()
[]
++
+
{}
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1
8322
(
[
8760
) 41 ]
438
(
[
8760
) 11.4 ]
+
{}
------------------------------------------------------------------------------------------------------------------------
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T18-150PC | 制造商:STMicroelectronics 功能描述:SRAM TIMEKEEPER 64K 48T18 DIP28 制造商:STMicroelectronics 功能描述:IC, TIMEKEEPER, YY-MM-DD-dd, 8KX8, DIP28, Date Format:YY-MM-DD-dd, Clock Format: |
| M48T18-150PC | 制造商:STMicroelectronics 功能描述:SRAM TIMEKEEPER 64K 48T18 DIP28 |
| M48T18-150PC1 | 功能描述:实时时钟 64K (8Kx8) 150ns 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 |
| M48T18-150PC1E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:64 Kbit 8Kb x 8 TIMEKEEPER SRAM |
| M48T18-150PC1F | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:64 Kbit 8Kb x 8 TIMEKEEPER SRAM |
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