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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： | 9/29页 |
| 文件大小： | 184K |
| 代理商： | M48T18-150MH1TR |
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M48T08, M48T18
System Battery Life
The useful life of the battery in the M48T08/18 is
expected to ultimately come to an end for one of
two reasons: either because it has been dis-
charged while providing current to the RAM and
clock in the battery back-up mode, or because the
effects of aging render the cell useless before it
can actually be completely discharged. The two ef-
fects are virtually unrelated, allowing discharge or
Capacity Consumption, and the effects of aging or
Storage Life, to be treated as two independent but
simultaneous mechanisms. The earlier occurring
failure mechanism defines the battery system life
of the M48T08/18.
Cell Storage Life. Storage life is primarily a func-
tion of temperature. Figure 12 illustrates the ap-
proximate storage life of the M48T08/18 battery
over temperature. The results in Figure 12 are de-
rived from temperature accelerated life test stud-
ies performed at STMicroelectronics. For the
purpose of the testing, a cell failure is defined as
the inability of a cell stabilized at 25°C to produce
a 2.4V closed circuit voltage across a 250 k
load
resistor. The two lines, t1% and t50%, represent dif-
ferent failure rate distributions for the cell's storage
life. At 70°C, for example, the t1% line indicates
that an M48T08/18 has a 1% chance of having a
battery failure 11 years into its life while the t50%
shows the part has a 50% chance of failure at the
20 year mark. The t1% line represents the practical
onset of wear out and can be considered the worst
case Storage Life for the cell. The t50% can be con-
sidered the normal or average life.
Figure 12. Predicted Battery Storage Life versus Temperature
AI01024
20
30
40
50
60
70
80
90
1
2
3
4
5
8
6
TEMPERATURE (Degrees Celsius)
10
20
30
40
50
YEARS
t50% (AVERAGE)
t1%
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| M48T558YMH1 | 0 TIMER(S), REAL TIME CLOCK, PDSO28 |
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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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