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SMJ44C251B Datasheet, PDF (19/57 Pages) Texas Instruments – 262144 BY 4-BIT MULTIPORT VIDEO RAM
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Austin Semiconductor, Inc.
VRAM
SMJ44C251B
MT42C4256
TIMING REQUIREMENTS OVER RECOMMENDED RANGES OF
SUPPLY VOLTAGES AND OPERATING FREE-AIR TEMPERATURE1
PARAMETER
Cycle time, read2
Cycle time, write2
Cycle time, read-modify-write2
Cycle time, page-mode read or write2
Cycle time, page-mode read-modify-write2
Cycle time, read transfer2
Cycle time, write transfer2
Cycle time, serial clock2
SYM/ALT. SYM
tc(rd)/tRC
tc(W) /tWC
tc(rdW) /tRMW
tc(P) /tPC
tc(rdWP) /tPRMW
tc(TRD)/tRC
tc(TW) /tWC
tc(SC)/tSCC
Pulse duration, CAS\ high
Pulse duration, CAS\ low4
tw(CH) /tCPN
tw(CL)/tCAS
Pulse duration, RAS\ high
Pulse duration, RAS\ low5
tw(RH) /tRP
tw(RL)/tRAS
Pulse duration,W\ low
tw(WL)/tWP
Pulse duration, TRG\ low
tw(TRG)
Pulse duration, SC high
tw(SCH) /tSC
Pulse duration, SC low
tw(SCL)/tSCP
Pulse duration, SE\ low
tw(SEL)/tSE
Pulse duration, SE\ high
tw(SEH) /tSEP
Pulse duration, TRG\ high
tw(GH) /tTP
Pulse duration, RAS\ low (page mode)
tw(RL)P
Setup time, column address
tsu(CA)/tASC
Setup time, DSF before CAS\ low
tsu(SFC)/tFSC
Setup time, row address
tsu(RA)/tASR
Setup time, W\ before RAS\ low
tsu(WMR)/tWSR
Setup time, DQ before RAS\ low
tsu(DQR)/tMS
Setup time, TRG\ before RAS\ low
Setup time, SE\ before RAS\ low6
tsu(TRG)/tTHS
tsu(SE) /tESR
Setup time, serial write disable
tsu(SESC)/tSWIS
Setup time, DSF before RAS\ low
tsu(SFR)/tFSR
Setup time, data before CAS\ low
tsu(DCL)/tDSC
Setup time, data before W\ low
tsu(DWL)/tDSW
Setup time, read command
tsu(rd)/tRCS
Setup time, early write command before CAS\ low tsu(WCL)/tWCS
Setup time, write before CAS\ high
Setup time, write before RAS\ high with
TRG\ = W\ = low
tsu(WCH)/tCWL
tsu(WRH)/tRWL
-10
MIN MAX
190
190
250
60
105
190
190
30
20
25 75000
80
100 75000
25
25
10
10
35
35
30
100 75000
0
0
0
0
0
0
0
10
0
0
0
0
0
25
25
-12
MIN MAX
220
220
290
70
125
220
220
35
30
30 75000
90
120 75000
25
30
12
12
40
40
20
120 75000
0
0
0
0
0
0
0
15
0
0
0
0
0
30
30
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
SMJ44C251B/MT42C4256
Rev. 0.1 12/03
19
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
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