參數(shù)資料
型號(hào)： M48T128V-85CS1
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, PDSO44
封裝： PLASTIC, SO-44
文件頁(yè)數(shù)： 15/30頁(yè)
文件大?。?/td> 162K
代理商： M48T128V-85CS1
M48T129Y, M48T129V
22/30
Figure 16. Calibration Waveform
Power Supply Decoupling and Undershoot
Protection
ICC transients, including those produced by output
switching, can produce voltage fluctuations, re-
sulting in spikes on the VCC bus. These transients
can be reduced if capacitors are used to store en-
ergy which stabilizes the VCC bus. The energy
stored in the bypass capacitors will be released as
low going spikes are generated or energy will be
absorbed when overshoots occur.
A ceramic bypass capacitor value of 0.1
F (see
Figure 17) is recommended in order to provide the
needed filtering. In addition to transients that are
caused by normal SRAM operation, power cycling
can generate negative voltage spikes on VCC that
drive it to values below VSS by as much as one
volt. These negative spikes can cause data cor-
ruption in the SRAM while in battery backup mode.
To protect from these voltage spikes, ST recom-
mends connecting a schottky diode from VCC to
VSS (cathode connected to VCC, anode to VSS).
(Schottky diode 1N5817 is recommended for
through hole and MBRS120T3 is recommended
for surface mount).
Figure 17. Supply Voltage Protection
AI00594B
NORMAL
POSITIVE
CALIBRATION
NEGATIVE
CALIBRATION
AI02169
VCC
0.1
F
DEVICE
VCC
VSS
相關(guān)PDF資料
PDF描述
M48T129Y-70CS1 0 TIMER(S), REAL TIME CLOCK, PDSO44
M48T129Y-70PM1 0 TIMER(S), REAL TIME CLOCK, PDIP32
M48T212A-85MH6TR 0 TIMER(S), REAL TIME CLOCK, PDSO44
M48T212A-85MH1TR 0 TIMER(S), REAL TIME CLOCK, PDSO44
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M48T128V-85PM1 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM
M48T128V-85PM1TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM
M48T128VPM 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM
M48T128Y 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM
M48T128Y_10 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3 V, 1 Mbit (128 Kb x 8) TIMEKEEPER?? SRAM
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