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M48T129Y датащи(PDF) 10 Page - STMicroelectronics

номер детали M48T129Y
подробное описание детали  5.0 or 3.3V, 1 Mbit (128 Kbit x 8) TIMEKEEPER SRAM
PDF  30 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M48T129Y датащи(HTML) 10 Page - STMicroelectronics

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M48T129Y, M48T129V
10/30
WRITE Mode
The M48T129Y/V is in the WRITE Mode whenever
W (WRITE Enable) and E (Chip Enable) are low
state after the address inputs are stable.
The start of a WRITE is referenced from the latter
occurring falling edge of W or E. A WRITE is termi-
nated by the earlier rising edge of W or E. The ad-
dresses 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 8. WRITE Enable Controlled, WRITE AC Waveforms
Figure 9. Chip Enable Controlled, WRITE AC Waveforms
AI02382
tAVAV
tWHAX
tDVWH
DATA INPUT
A0-A16
E
W
DQ0-DQ7
VALID
tAVWH
tAVEL
tWLWH
tAVWL
tWLQZ
tWHDX
tWHQX
AI02582
tAVAV
tEHAX
tDVWH
A0-A16
E
W
DQ0-DQ7
VALID
tAVEL
tAVWL
tELEH
tWHDX
DATA INPUT



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