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M68AW064F датащи(PDF) 11 Page - STMicroelectronics

номер детали M68AW064F
подробное описание детали  1 Mbit 64K x16 3.0V Asynchronous SRAM
PDF  18 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M68AW064F датащи(HTML) 11 Page - STMicroelectronics

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M68AW064F
Write Mode
The M68AW064F is in the Write mode whenever
the W and E are Low. Either the Chip Enable input
(E) or the Write Enable input (W) must be de-
asserted
during
Address
transitions
for
subsequent write cycles. When E (W) is Low, and
UB or LB is Low, write cycle begins on the W (E)’s
falling edge. Therefore, address setup time is
referenced to Write Enable as tAVWL and to Chip
Enable as tAVEL and is determined by the latter
occurring edge.
The Write cycle can be terminated by the earlier
rising edge of E or W.
If the Output is enabled (E = Low, G = Low, LB or
UB = Low), then W will return the outputs to high
impedance within tWLQZ of its falling edge. Care
must be taken to avoid bus contention in this type
of operation. Data input must be valid for tDVWH
before the rising edge of Write Enable, or for tDVEH
before the rising edge of E, whichever occurs first,
and remain valid for tWHDX and tEHDX respectively.
Figure 10. Write Enable Controlled, Write AC Waveforms
AI04878
tAVAV
tWHAX
tDVWH
DATA INPUT
A0-A15
E
W
DQ0-DQ15
VALID
tAVWH
tAVEL
tWLWH
tAVWL
tWLQZ
tWHDX
tWHQX
tBLWH
UB, LB



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