SMJ44C251B Datasheet, PDF (37/53 Pages) Texas Instruments – 262144 BY 4-BIT MULTIPORT VIDEO RAM

RAS
CAS
A0 – A8
DSF
TRG
SMJ44C251B
262144 BY 4-BIT
MULTIPORT VIDEO RAM
SGMS058A – MARCH 1995 – REVISED JUNE 1995
PARAMETER MEASUREMENT INFORMATION
tw(RL)
tc(rd)
td(CHRL)
tw(RH)
tt
td(CHRL)
td(RHCL)
tt
Don’t Care
Don’t Care
tsu(RA)
tsu(SFR)
Don’t Care
tsu( _TRG)
Don’t Care
Row
th(RA)
th(SFR)
th( _TRG)
Row
W
Don’t Care
DQ0 – DQ3
Don’t 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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