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M48T128Y датащи(PDF) 18 Page - STMicroelectronics

номер детали M48T128Y
подробное описание детали  3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM
PDF  22 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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M48T128Y датащи(HTML) 18 Page - STMicroelectronics

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M48T128Y, M48T128V*
18/22
Figure 12. Power Down/Up Mode AC Waveforms
Table 10. Power Down/Up AC Characteristics
Note: 1. Valid for Ambient Operating Temperature: TA = 0 to 70°C; VCC = 4.5 to 5.5V or 3.0 to 3.6V (except where noted).
2. VPFD (max) to VPFD (min) fall time of less than tF may result in deselection/write protection not occurring until 200µs after VCC pass-
es VPFD (min).
3. VPFD (min) to VSS fall time of less than tFB may cause corruption of RAM data.
Table 11. Power Down/Up Trip Points DC Characteristics
Note: 1. All voltages referenced to VSS.
2. Valid for Ambient Operating Temperature: TA = 0 to 70°C; VCC = 4.5 to 5.5V or 3.0 to 3.6V (except where noted).
3. At 25°C; VCC = 0V.
Symbol
Parameter(1)
Min
Max
Unit
tF
(2)
VPFD (max) to VPFD (min) VCC Fall Time
300
µs
tFB
(3)
VPFD (min) to VSS VCC Fall Time
10
µs
tR
VPFD (min) to VPFD (max) VCC Rise Time
0µs
tRB
VSS to VPFD (min) VCC Rise Time
1µs
tREC
VPFD (max) to Inputs Recognized
40
200
ms
Symbol
Parameter(1,2)
Min
Typ
Max
Unit
VPFD
Power-fail Deselect Voltage
M48T128Y
4.1
4.35
4.5
V
M48T128V
2.7
2.9
3.0
V
VSO
Battery Back-up Switchover Voltage
M48T128Y
3.0
V
M48T128V
VPFD –100mV
V
tDR
(3)
Expected Data Retention Time
10
YEARS
AI03612
VCC
INPUTS
OUTPUTS
DON'T CARE
HIGH-Z
tF
tFB
tDR
tREC
tRB
VALID
VALID
RECOGNIZED
RECOGNIZED
VPFD (max)
VPFD (min)
VSS



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