SMJ44C251B Datasheet, PDF (39/53 Pages) Texas Instruments – 262144 BY 4-BIT MULTIPORT VIDEO RAM

SMJ44C251B
262144 BY 4-BIT
MULTIPORT VIDEO RAM
SGMS058A – MARCH 1995 – REVISED JUNE 1995
PARAMETER MEASUREMENT INFORMATION
Memory Read Cycle
tw(RL)
tc(rd)
tw(RH)
tw(RL)
RAS
CAS
td(RLCA)
th(RA)
td(CHRL)
td(CARH)
th(CLCA)
tsu(CA)
tsu(RA)
A0 – A8
Row
Col
Refresh Cycle
tc(rd)
tw(RH)
Refresh Cycle
tc(rd)
tw(CL)
td(RLCH)
Don’t Care
th(RHrd)
DSF
TRG
tsu(RD)
tsu( _TRG)
td(GLRH)
ta(G)
th( _TRG)
Don’t Care
tdis(G)
W
DQ0 – DQ3
ta(R)
ta(C)
Don’t Care
Valid Data
tdis(CH)
Figure 27. Hidden-Refresh-Cycle Timing
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