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M48T37Y датащи(PDF) 23 Page - STMicroelectronics

номер детали M48T37Y
подробное описание детали  5.0 or 3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER짰 SRAM
PDF  30 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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M48T37Y датащи(HTML) 23 Page - STMicroelectronics

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M48T37Y, M48T37V
DC and AC parameters
Doc ID 7019 Rev 9
23/30
Note:
All voltages referenced to VSS.
Table 12.
Power down/up AC characteristics
Symbol
Parameter(1)
1.
Valid for ambient operating temperature: TA = 0 to 70 °C or –40 to 85 °C; VCC = 4.5 to 5.5 V or 3.0 to 3.6 V
(except where noted).
Min
Max
Unit
tF
(2)
2.
VPFD (max) to VPFD (min) fall time of less than tF may result in deselection/write protection not occurring
until 200 µs 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
10
µs
tR
VPFD (min) to VPFD (max) VCC rise time
10
µs
tRB
VSS to VPFD (min) VCC rise time
1
µs
tREC
(4)
4.
tREC (min) = 20 ms for industrial temperature range - grade 6 device.
VPFD (max) to RST high
40
200
ms
Table 13.
Power down/up trip points DC characteristics
Symbol
Parameter(1)
1.
Valid for ambient operating temperature: TA = 0 to 70 °C or –40 to 85 °C; VCC = 4.5 to 5.5 V or 3.0 to 3.6 V
(except where noted).
Min
Typ
Max
Unit
VPFD
Power-fail deselect voltage
M48T37Y
4.2
4.4
4.5
V
M48T37V
2.7
2.9
3.0
V
VSO
Battery backup switchover voltage
M48T37Y
VBAT
V
M48T37V
VPFD –100 mV
V
tDR
(2)
2.
At 25 °C, VCC = 0 V.
Expected data retention time
Grade 1
5
7
Years
Grade 6
10(3)
3.
Using larger M4T32-BR12SH6 SNAPHAT® top (recommended for industrial temperature range - grade 6
device).
Years



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