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AS4C256K16FO-50JI Datasheet(PDF) 5 Page - Alliance Semiconductor Corporation

Part # AS4C256K16FO-50JI
Description  5V 256K X 16 CMOS DRAM (Fast Page Mode)
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Manufacturer  ALSC [Alliance Semiconductor Corporation]
Direct Link  https://www.alliancememory.com
Logo ALSC - Alliance Semiconductor Corporation

AS4C256K16FO-50JI Datasheet(HTML) 5 Page - Alliance Semiconductor Corporation

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AS4C256K16FO
4/11/01; V.0.9.1
Alliance Semiconductor
P. 5 of 25
Write cycle
(VCC = 5V ± 10%, GND = 0V, Ta = 0° C to +70° C)
Read-modify-write cycle
(VCC = 5V ± 10%, GND = 0V, Ta = 0° C to +70° C)
Fast page mode cycle
(VCC = 5V ± 10%, GND = 0V, Ta = 0° C to +70° C)
Standard
Symbol
Parameter
–25
–30
–35
–50
Unit
Notes
Min
Max
Min
Max
Min
Max
Min
Max
tASC
Column address setup time
0
0–
0–
0–
ns
tCAH
Column address hold time
5
5–
5–
9–
ns
tAWR
Column address hold time to RAS
19
26
28
30
ns
tWCS
Write command setup time
0
0–
0–
0–
ns
11
tWCH
Write command hold time
5
5–
5–
9–
ns
11
tWCR
Write command hold time to RAS
19
26
28
30
ns
tWP
Write command pulse width
5
5
5
9
ns
tRWL
Write command to RAS lead time
7
10
11
12
ns
tCWL
Write command to CAS lead time
5
10
11
12
ns
tDS
Data-in setup time
0
0–
0–
0–
ns
12
tDH
Data-in hold time
5
5–
5–
9–
ns
12
tDHR
Data-in hold time to RAS
19
26
28
30
ns
Standard
Symbol
Parameter
–25
–30
–35
–50
Unit
Notes
Min
Max
Min
Max
Min
Max
Min
Max
tRWC
Read-write cycle time
100
100
105
120
ns
tRWD
RAS to WE delay time
34
50
54
60
ns
11
tCWD
CAS to WE delay time
17
26
28
30
ns
11
tAWD
Column address to WE delay time
21
32
35
40
ns
11
tRSH(W) CAS to RAS hold time (write)
7
10
10
12
ns
tCAS(W) CAS pulse width (write)
15
15
15
15
ns
Standard
Symbol
Parameter
–25
–30
–35
–50
Unit
Notes
Min
Max
Min
Max
Min
Max
Min
Max
tPC
Read or write cycle time
8
12
14
25
ns
14
tCAP
Access time from CAS precharge
14
19
21
23
ns
13
tCP
CAS precharge time
3–3
4–5–
ns
tPCM
Fast page mode RMW cycle
56
56
58
60
ns
tCRW
Page mode CAS pulse width (RMW)
44
44
46
50
ns
tRASP
RAS pulse width
25
75K
30
75K
35
75K
50
75K
ns


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