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M48Z35Y-70MH1F Datasheet(PDF) 10 Page - STMicroelectronics

Part # M48Z35Y-70MH1F
Description  256Kbit (32Kbit x 8) ZEROPOWER SRAM
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M48Z35Y-70MH1F Datasheet(HTML) 10 Page - STMicroelectronics

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Operating modes
M48Z35, M48Z35Y
10/23
2.2
Write mode
The M48Z35/Y is in the WRITE Mode whenever W and E are low. The start of a WRITE is
referenced from the latter occurring falling edge of W or E. A WRITE is terminated by the
earlier rising edge of W or E. The addresses must be held valid throughout the cycle. E or W
must return high for a minimum of tEHAX 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; although, if the output bus has been activated by a
low on E and G, a low on W will disable the outputs tWLQZ after W falls.
Figure 6.
Write enable controlled, write AC waveforms
Figure 7.
Chip enable controlled, write AC waveforms
AI00926
tAVAV
tWHAX
tDVWH
DATA INPUT
A0-A14
E
W
DQ0-DQ7
VALID
tAVWH
tAVEL
tWLWH
tAVWL
tWLQZ
tWHDX
tWHQX
AI00927
tAVAV
tEHAX
tDVEH
A0-A14
E
W
DQ0-DQ7
VALID
tAVEH
tAVEL
tAVWL
tELEH
tEHDX
DATA INPUT


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