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TM497MBK36Q Datasheet(PDF) 6 Page - Texas Instruments

Part # TM497MBK36Q
Description  4194304 BY 36-BIT DYNAMIC RAM MODULE
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TM497MBK36Q Datasheet(HTML) 6 Page - Texas Instruments

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TM497MBK36A, TM497MBK36Q
4194304 BY 36-BIT
DYNAMIC RAM MODULE
SMMS446C – DECEMBER 1992 – REVISED JUNE 1995
6
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
capacitance over recommended ranges of supply voltage and operating free-air temperature,
f = 1 MHz (see Note 5)
PARAMETER
MIN
MAX
UNIT
Ci(A)
Input capacitance, address inputs
60
pF
Ci(C)
Input capacitance, CAS inputs
21
pF
Ci(R)
Input capacitance, RAS inputs
42
pF
Ci(W)
Input capacitance, write-enable input
84
pF
C
Output capacitance
DQ pins
7
pF
Co
Output capacitance
Parity pins
12
pF
NOTE 5: VCC = 5 V ± 0.5 V, and the bias on pins under test is 0 V.
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature
PARAMETER
’497MBK36A-60
’497MBK36A-70
’497MBK36A-80
UNIT
PARAMETER
MIN
MAX
MIN
MAX
MIN
MAX
UNIT
tAA
Access time from column address
30
35
40
ns
tCAC
Access time from CAS low
15
18
20
ns
tCPA
Access time from column precharge
35
40
45
ns
tRAC
Access time from RAS low
60
70
80
ns
tCLZ
CAS to output in low-impedance state
0
0
0
ns
tOH
Output disable time, start of CAS high
3
3
3
ns
tOFF
Output disable time after CAS high (see Note 6)
0
15
0
18
0
20
ns
NOTE 6: tOFF is specified when the output is no longer driven.
timing requirements over recommended ranges of supply voltage and operating free-air
temperature
’497MBK36A-60
’497MBK36A-70
’497MBK36A-80
UNIT
MIN
MAX
MIN
MAX
MIN
MAX
UNIT
tRC
Cycle time, random read or write (see Note 7)
110
130
150
ns
tPC
Cycle time, page-mode read or write (see Notes 7 and 8)
40
45
50
ns
tRASP
Pulse duration, page-mode, RAS low
60
100 000
70
100 000
80
100 000
ns
tRAS
Pulse duration, nonpage-mode, RAS low
60
10 000
70
10 000
80
10 000
ns
tCAS
Pulse duration, CAS low
15
10 000
18
10 000
20
10 000
ns
tCP
Pulse duration, CAS high
10
10
10
ns
tRP
Pulse duration, RAS high (precharge)
40
50
60
ns
tWP
Pulse duration, W low
10
10
10
ns
tASC
Setup time, column address before CAS low
0
0
0
ns
tASR
Setup time, row address before RAS low
0
0
0
ns
tDS
Setup time, data before CAS low
0
0
0
ns
tRCS
Setup time, W high before CAS low
0
0
0
ns
tCWL
Setup time, W low before CAS high
15
18
20
ns
tRWL
Setup time, W low before RAS high
15
18
20
ns
tWCS
Setup time, W low before CAS low
0
0
0
ns
tWRP
Setup time, W high before RAS low (CBR refresh only)
10
10
10
ns
NOTES:
7. All cycles assume tT = 5 ns.
8. To assure tPC min, tASC should be ≥ tCP.


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