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M48T08 Datasheet(PDF) 10 Page - STMicroelectronics

Part # M48T08
Description  5V, 64Kbit (8 Kb x 8) TIMEKEEPER짰 SRAM
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M48T08 Datasheet(HTML) 10 Page - STMicroelectronics

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Operation modes
M48T08, M48T08Y, M48T18
10/30
Table 3.
Read mode AC characteristics
Note:
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).
Write mode
The M48T08/18/08Y is in the WRITE Mode whenever W, E1, and E2 are active. The start of
a WRITE is referenced from the latter occurring falling edge of W or E1, or the rising edge of
E2. A WRITE is terminated by the earlier rising edge of W or E1, or the falling edge of E2.
The addresses must be held valid throughout the cycle. E1 or W must return high or E2 low
for a minimum of tE1HAX or tE2LAX from Chip Enable or tWHAX from WRITE Enable prior to
the initiation of another READ or WRITE Cycle. Data-in must be valid tDVWH prior to the end
of WRITE and remain valid for tWHDX afterward. G should be kept high during WRITE
Cycles to avoid bus contention; however, if the output bus has been activated by a low on
E1 and G and a high on E2, a low on W will disable the outputs tWLQZ after W falls.
Symbol
Parameter(1)
M48T08/M48T18/T08Y
Unit
–100/–10 (T08Y)
–150/–15 (T08Y)
Min
Max
Min
Max
tAVAV
READ Cycle Time
100
150
ns
tAVQV
Address Valid to Output Valid
100
150
ns
tE1LQV
Chip Enable 1 Low to Output Valid
100
150
ns
tE2HQV
Chip Enable 2 High to Output Valid
100
150
ns
tGLQV
Output Enable Low to Output Valid
50
75
ns
tE1LQX
Chip Enable 1 Low to Output Transition
10
10
ns
tE2HQX
Chip Enable 2 High to Output Transition
10
10
ns
tGLQX
Output Enable Low to Output Transition
5
5
ns
tE1HQZ
Chip Enable 1 High to Output Hi-Z
50
75
ns
tE2LQZ
Chip Enable 2 Low to Output Hi-Z
50
75
ns
tGHQZ
Output Enable High to Output Hi-Z
40
60
ns
tAXQX
Address Transition to Output Transition
5
5
ns


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