SMJ44C251 Datasheet, PDF (40/53 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
RAS
td(CHRL)
tw(RL)
td(RLCL)
tc( _{TW )}
td(RLCH)
td(CARH)
CAS
A0 – A8
DSF
th(RA)
tsu(RA)
Row
tsu(SFR)
tsu(CA)
td(RLCA)
th(RLCA)
Tap Point
A0 – A8
th(SFR)
tw(CL)
th(CLCA)
tw(RH)
tw(CH)
Don’t Care
th( _TRG)
tsu( _TRG)
TRG
tsu( _WMR)
W
th(RWM)
Don’t Care
td(RHSC)
DQ0 – DQ3
td(SCRL)
SC
Hi-Z
tw(SCH)
tw(SCH)
th(RLSQ)
SDQ0 – SDQ3 Valid Data Output
tdis(SE)
tsu(SE)
td(RLSD)
th(SE)
tw(SCL)
tsu(SDS)
Don’t Care
Valid Data
Input
th(SDS)
td(SESC)
SE
Don’t Care
td(CLQSF)
QSF
Tap Point
Bit A7
td(GHQSF)
td(RLQSF)
NOTE: The write-mode-control cycle is used to change the SDQs from the output mode to the input mode. This allows serial data to be written
into the data register. This figure assumes that the device was originally in the serial-read mode.
Figure 28. Write-Mode-Control Pseudo-Transfer Timing
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