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LH521028A Datasheet(PDF) 11 Page - Sharp Corporation

Part # LH521028A
Description  CMOS 64K x 18 Static RAM
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Manufacturer  SHARP [Sharp Corporation]
Direct Link  http://sharp-world.com/
Logo SHARP - Sharp Corporation

LH521028A Datasheet(HTML) 11 Page - Sharp Corporation

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TIMING DIAGRAMS – WRITE CYCLE
Addresses must be stable during unlatched Write
cycles. The outputs will remain in the High-Z state if W is
LOW when E and SH / SL go LOW. If G is HIGH, the
outputs will remain in the High-Z state. Although these
examples illustrate timing with G active, it is recom-
mended that G be held HIGH for all Write cycles. This will
prevent the LH521028’s outputs from becoming active,
preventing bus contention, thereby reducing system
noise.
Write Cycle No. 1 (Unlatched W Controlled Write)
Chip is selected: E, G, and SH / SL are LOW, ALE is
High. Using only W to control Write cycles may not offer
the best performance since both tWHZ and tDW timing
specifications must be met.
Write Cycle No. 2 (E, SL, SH Controlled Write)
G is LOW. DQ lines may transition to Low-Z if the falling
edge of W occurs after the falling edge of E, SH/SL if G is
LOW.
tWC
tAW
tWP
tDW
tAH
tWLZ
tWHZ
tAS
tDH
PREVIOUS OUTPUT
VALID DATA
VALID ADDRESS
521028-6
W
ADDRESS
DQ
Figure 8. Write Cycle No. 1
tEW
ADDRESS
E, SL, SH
DQ
VALID DATA
VALID ADDRESS
tWC
tWP
tAH
tAS
tELZ
tWHZ
tDW
tDH
W
521028-7
Figure 9.
Write Cycle No. 2
CMOS 64K
×× 18 Static RAM
LH521028A
11


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