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SMJ44C251 Datasheet, PDF (37/53 Pages) Texas Instruments – 262144 BY 4-BIT MULTIPORT VIDEO RAM | |||
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RAS
CAS
A0 â A8
DSF
TRG
SMJ44C251B
262144 BY 4-BIT
MULTIPORT VIDEO RAM
SGMS058A â MARCH 1995 â REVISED JUNE 1995
PARAMETER MEASUREMENT INFORMATION
tw(RL)
tc(rd)
td(CHRL)
tw(RH)
tt
td(CHRL)
td(RHCL)
tt
Donât Care
Donât Care
tsu(RA)
tsu(SFR)
Donât Care
tsu( TRG)
Donât Care
Row
th(RA)
th(SFR)
th( TRG)
Row
W
Donât Care
DQ0 â DQ3
Donât Care
NOTE A: In persistent write-per-bit function, W must be high at the falling edge of RAS during the refresh cycle.
Figure 25. RAS-Only Refresh-Cycle Timing
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37
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