SMJ44C251B Datasheet, PDF (20/57 Pages) Texas Instruments – 262144 BY 4-BIT MULTIPORT VIDEO RAM

Austin Semiconductor, Inc.
VRAM
SMJ44C251B
MT42C4256
TIMING REQUIREMENTS (continued)¹
PARAMETER
SYM/ALT. SYM
Setup time, SDQ before SC high
t_su(SDS)/t_SDS
Hold time, column address after CAS\ low
t_h(CLCA)/t_CAH
Hold time, DSF after CAS\ low
t_h(SFC)/t_CFH
Hold time, row address after RAS\ low
t_h(RA)/t_RAH
Hold time, TRG\ after RAS\ low
Hold time, SE\ after RAS\ low with
TRG\ = W\ = low⁶
Hold time, write mask, transfer enable
after RAS\ low
Hold time, DQ after RAS\ low
(write-mask operation)
t_h(TRG)/t_TLH
t_h(SE) /t_REH
t_h(RWM)/t_RWH
t_h(RDQ)/t_MH
Hold time, DSF after RAS\ low
Hold time, column address after RAS\ low⁷
t_h(SFR)/t_RFH
t_h(RLCA)/t_{A R}
Hold time, data after CAS\ low
Hold time, data after RAS\ low⁷
t_h(CLD)/t_DH
t_h(RLD)/t_DHR
Hold time, data after W\ low
Hold time, read after CAS\ high⁸
Hold time, read after RAS\ high⁸
t_h(WLD)/t_DH
t_h(CHrd)/t_RCH
t_h(RHrd)/t_RRH
Hold time, write after CAS\ low
Hold time, write after RAS\ low⁷
Hold time, TRG\ after W\ low⁹
t_h(CLW)/t_WCH
t_h(RLW)/t_WCR
t_h(WLG)/t_OEH
Hold time, SDQ after SC high
t_h(SDS)/t_SDH
Hold time, SDQ after SC high
t_h(SHSQ)/t_SOH
Hold time, DSF after RAS\ low
t_h(RSF)/t_FHR
Hold time, serial-write disable
t_h(SCSE) /t_SWIH
Delay time, RAS\ low to CAS\ high
t_d(RLCH)/t_CSH
Delay time, CAS\ high to RAS\ low
t_d(CHRL)/t_CRP
Delay time, CAS\ low to RAS\ high
Delay time, CAS\ low to W\ low^10,11
Delay time, RAS\ low to CAS\ low¹²
t_d(CLRH)/t_RSH
t_d(CLWL)/t_CWD
t_d(RLCL)/t_RCD
Delay time, column address to RAS\ high
t_d(CARH)/t_RAL
Delay time, RAS\ low to W\ low¹⁰
t_d(RLWL)/t_RWD
Delay time, column address to W\ low¹⁰
t_d(CAWL)/t_AWD
Delay time, RAS\ low to CAS\ high¹³
t_d(RLCH)RF/t_CHR
Delay time, CAS\ low to RAS\ low¹³
t_d(CLRL)RF/t_CSR
Delay time, RAS\ high to CAS\ low¹³
t_d(RHCL)RF/t_RPC
Delay time, CAS\ low to TRG\ high for DRAM read
cycles
t_d(CLGH)
-10
MIN MAX
0
20
20
15
15
15
15
15
15
45
20
45
20
0
10
30
50
25
5
5
45
20
100
0
25
55
25
75
50
130
85
25
10
10
25
-12
MIN MAX
0
20
20
15
15
UNIT
ns
ns
ns
ns
ns
15
ns
15
ns
15
ns
15
ns
45
ns
25
ns
50
ns
25
ns
0
ns
10
ns
35
ns
55
ns
30
ns
5
ns
5
ns
45
ns
20
ns
120
ns
0
ns
30
ns
65
ns
25
90
ns
60
ns
155
ns
100
ns
25
ns
10
ns
10
ns
30
ns
SMJ44C251B/MT42C4256
Rev. 0.1 12/03
20
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