5962-8949703MMA Ver la hoja de datos (PDF) - Austin Semiconductor
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5962-8949703MMA Datasheet PDF : 57 Pages
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Austin Semiconductor, Inc.
VRAM
SMJ44C251B
MT42C4256
CAPACITANCE OVER RECOMMENDED RANGES OF SUPPLY
VOLTAGES AND OPERATING FREE-AIR TEMPERATURE, f = 1MHz1
PARAMETER
Input capacitance, A0 - A8
Input capacitance, CAS\ and RAS\
Output capacitance, SDQs and DQs
Output capacitance, SQSF
SYM
Ci(A)
Ci(RC)
Co(O)
Co(QSF)
MIN
MAX
7
7
9
9
UNIT
pF
pF
pF
pF
SWITCHING CHARACTERISTICS OVER RECOMMENDED RANGES
OF SUPPLY VOLTAGES AND OPERATING FREE-AIR TEMPERA-
TURE2
PARAMETER
SYM/ALT. SYM CONDITIONS4
-10
MIN MAX
-12
MIN MAX UNIT
Access time from CAS\
ta(C)/tCAC
td(RLCL) = MAX
25
30 ns
Access time from column address
ta(CA)/tCAA
td(RLCL) = MAX
50
60 ns
Access time from CAS\ high
ta(CP) /tCPA
td(RLCL) = MAX
55
65 ns
Access time from RAS\
ta(R)/tRAC
td(RLCL) = MAX
100
120 ns
Access time of DQ0 - DQ3 from TRG\ low
ta(G)/tOEA
25
30 ns
Access time of SDQ0 - SDQ3 from SC high
ta(SQ)/tSCA
CL = 30pF
30
35 ns
Access time of SDQ0 - SDQ3 from SE\ low
ta(SE) /tSEA
CL = 30pF
20
25 ns
Disable time, random output from CAS\ high3
Disable time, random output from TRG\ high3
Disable time, random output from SE\ high3
tdis(CH)/tOFF
tdis(G) /tOEZ
tdis(SE) /tSEZ
CL = 100pF
CL = 100pF
CL = 30pF
0
20
0
20 ns
0
20
0
20 ns
0
20
0
20 ns
NOTES:
1. 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.
2. Switching times assume CL = 100 pF unless otherwise noted (see Figure 12).
3. tdis(CH), tdis(G), and tdis(SE) are specified when the output is no longer driven.
4. For conditions shown as MIN/ MAX, use the appropriate value specified in the timing requirements.
SMJ44C251B/MT42C4256
Rev. 0.1 12/03
18
Austin Semiconductor, Inc. reserves the right to change products or specifications without notice.
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