參數(shù)資料
型號(hào)： M48T18-100MH1TR
廠商： STMICROELECTRONICS
元件分類： 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取
英文描述： 0 TIMER(S), REAL TIME CLOCK, PDSO28
封裝： SNAPHAT, PLASTIC, SO-28
文件頁(yè)數(shù)： 9/29頁(yè)
文件大小： 184K
代理商： M48T18-100MH1TR
17/29
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%
相關(guān)PDF資料
PDF描述
M48T18-100MH1 0 TIMER(S), REAL TIME CLOCK, PDSO28
M48T18-150PC1 0 TIMER(S), REAL TIME CLOCK, PDIP28
M48T08-100PC1 0 TIMER(S), REAL TIME CLOCK, PDIP28
M48T08-150PC1 0 TIMER(S), REAL TIME CLOCK, PDIP28
M48T18-100PC1 0 TIMER(S), REAL TIME CLOCK, PDIP28
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M48T18-100PC1 功能描述:實(shí)時(shí)時(shí)鐘 64K (8Kx8) 100ns 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
M48T18-100PC1 制造商:STMicroelectronics 功能描述:SRAM TIMEKEEPER 64K 48T18 DIP28
M48T18-100PC1E 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:64 Kbit 8Kb x 8 TIMEKEEPER SRAM
M48T18-100PC1F 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:64 Kbit 8Kb x 8 TIMEKEEPER SRAM
M48T18-100PC1TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:CMOS 8K x 8 TIMEKEEPER SRAM
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