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