參數(shù)資料
型號(hào)： M48T129Y-85PM1
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, DMA32
封裝： PLASTIC, MODULE, DIP-32
文件頁(yè)數(shù)： 4/30頁(yè)
文件大小： 483K
代理商： M48T129Y-85PM1
M48T129Y, M48T129V
12/30
Data Retention Mode
With valid VCC applied, the M48T129Y/V operates
as a conventional BYTEWIDE static RAM.
Should the supply voltage decay, the RAM will au-
tomatically deselect, write protecting itself when
VCC falls between VPFD (max), VPFD (min) win-
dow. All outputs become high impedance and all
inputs are treated as “Don't care.”
Note: A power failure during a WRITE cycle may
corrupt data at the current addressed location, but
does not jeopardize the rest of the RAM's content.
At voltages below VPFD (min), the memory will be
in a write protected state, provided the VCC fall
time is not less than tF. The M48T129Y/V may re-
spond to transient noise spikes on VCC that cross
into the deselect window during the time the de-
vice is sampling VCC. Therefore, decoupling of the
power supply lines is recommended.
When VCC drops below VSO, the control circuit
switches power to the internal battery, preserving
data and powering the clock. The internal energy
source will maintain data in the M48T129Y/V for
an accumulated period of at least 10 years at room
temperature. As system power rises above VSO,
the battery is disconnected, and the power supply
is switched to external VCC. Deselect continues for
tREC after VCC reaches VPFD (max). For a further
more detailed review of lifetime calculations,
please see Application Note AN1012.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M48T129YPM 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM
M48T129YSH 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM
M48T18 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5V, 64Kbit (8 Kb x 8) TIMEKEEPER㈢ SRAM
M48T18-100MH1 功能描述:RAM其它 8KX8 TIMEKEEP 100NS RoHS:否 制造商:Freescale Semiconductor 封裝:Tray
M48T18-100MH1E 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:64 Kbit 8Kb x 8 TIMEKEEPER SRAM
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