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M48T58 датащи(PDF) 23 Page - STMicroelectronics

номер детали M48T58
подробное описание детали  5.0V, 64 Kbit (8 Kb x 8) TIMEKEEPER SRAM
PDF  31 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M48T58 датащи(HTML) 23 Page - STMicroelectronics

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M48T58, M48T58Y
DC and AC parameters
23/31
Table 10.
Power down/up AC characteristics
Table 11.
Power down/up trip points DC characteristics
Symbol
Parameter(1)
1.
Valid for Ambient Operating Temperature: TA = 0 to 70°C; VCC = 4.75 to 5.5V or 4.5 to 5.5V (except where
noted).
Min
Max
Unit
tPD
E1 or W at VIH or E2 at VIL before Power Down
0
µs
tF
(2)
2.
VPFD (max) to VPFD (min) fall time of less than tF may result in deselection/write protection not occurring
until 200µs after VCC passes VPFD (min).
VPFD (max) to VPFD (min) VCC Fall Time
300
µs
tFB
(3)
3.
VPFD (min) to VSS fall time of less than tFB may cause corruption of RAM data.
VPFD (min) to VSS VCC Fall Time
M48T58
10
µs
M48T58Y
10
µs
tR
VPFD (min) to VPFD (max) VCC Rise Time
10
µs
tRB
VSS to VPFD (min) VCC Rise Time
1
µs
trec
VPFD (max) to Inputs Recognized
40
200
ms
Symbol
Parameter(1)(2)
1.
Valid for Ambient Operating Temperature: TA = 0 to 70°C; VCC = 4.75 to 5.5V or 4.5 to 5.5V (except where
noted).
2.
All voltages referenced to VSS.
Min
Typ
Max
Unit
VPFD
Power-fail Deselect Voltage
M48T58
4.5
4.6
4.75
V
M48T58Y
4.2
4.35
4.5
V
VSO
Battery Back-up Switchover Voltage
3.0
V
tDR
(3)
3.
At 25°C, VCC = 0V.
Expected Data Retention Time
7
YEARS



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