SMJ44C251 Datasheet, PDF (20/53 Pages) Texas Instruments – 262144 BY 4-BIT MULTIPORT VIDEO RAM

SMJ44C251B
262144 BY 4-BIT
MULTIPORT VIDEO RAM
SGMS058A – MARCH 1995 – REVISED JUNE 1995
capacitance over recommended ranges of supply voltage and operating free-air temperature,
f = 1 MHz (see Note 6)
PARAMETER
MIN MAX UNIT
Ci(A)
Input capacitance, A0 – A8
7 pF
Ci(RC)
Input capacitance, CAS and RAS
7 pF
Co(O)
Output capacitance, SDQs and DQs
9 pF
Co(QSF) Output capacitance, QSF
9 pF
NOTE 6: Capacitance is sampled only at initial design and after any major change. Samples are tested at 0 V and 25°C with a 1-MHz signal
applied to the terminal under test. All other terminals are open.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature (see Note 7)
PARAMETER
TEST
CONDITIONS ^†
ALT. ^{’44C251B - 10 ’44C251B - 12}
SYMBOL _{MIN MAX MIN MAX}
ta(C)
ta(CA)
ta(CP)
ta(R)
ta(G)
ta(SQ)
ta(SE)
tdis(CH)
Access time from CAS
Access time from column address
Access time from CAS high
Access time from RAS
Access time of DQ0 – DQ3 from TRG low
Access time of SDQ0 – SDQ3 from SC high
Access time of SDQ0 – SDQ3 from SE low
Disable time, random output from CAS high
(see Note 8)
td(RLCL) = MAX
td(RLCL) = MAX
td(RLCL) = MAX
td(RLCL) = MAX
CL = 30 pF
CL = 30 pF
CL = 100 pF
tCAC
tAA
tCPA
tRAC
tOEA
tSCA
tSEA
tOFF
25
50
55
100
25
30
20
0
20
30
60
65
120
30
35
25
0
20
tdis(G)
Disable time, random output from TRG high
(see Note 8)
CL = 100 pF
tOEZ
0
20
0
20
tdis(SE)
Disable time, serial output from SE high
(see Note 8)
CL = 30 pF
tSEZ
0
20
† _{For conditions shown as MIN / MAX, use the appropriate value specified in the timing requirements.}
NOTES: 7. Switching times assume CL = 100 pF unless otherwise noted (see Figure 12).
8. tdis(CH), tdis(G), and tdis(SE) are specified when the output is no longer driven.
0
20
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
20
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