AS4C256K16E0
®
AC parameters common to all waveforms
-30
-35
-50
Std
Symbol
Parameter
Min
65
25
30
5
Max
–
Min
70
25
35
6
Max
–
Min
85
25
50
10
15
15
10
50
5
Max Unit
Notes
tRC
Random read or write cycle time
RAS precharge time
–
–
ns
ns
tRP
–
–
tRAS
tCAS
tRCD
tRAD
tRSH(R)
tCSH
tCRP
tASR
tRAH
tT
RAS pulse width
75K
–
75K
–
75K ns
CAS pulse width
–
35
25
–
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
ns
RAS to CAS delay time
RAS to column address delay time
CAS to RAS hold time (read cycle)
RAS to CAS hold time
CAS to RAS precharge time
Row address setup time
Row address hold time
Transition time (rise and fall)
Refresh period
15
10
10
30
5
20
14
–
16
11
10
35
5
24
17
–
6
7
–
–
–
–
–
–
0
–
0
–
0
–
5
–
6
–
9
–
1.5
–
50
8
1.5
–
50
8
3
50
8
4,5
3
tREF
–
tCLZ
CAS to output in low Z
0
–
0
–
3
–
8
Shaded areas contain advance information.
Read cycle
-30
-35
-50
Std
Symbol
Parameter
Min
–
Max
30
10
16
–
Min
–
Max
35
10
18
–
Min
–
Max
50
10
25
–
Unit Notes
tRAC
Access time from RAS
ns
6
tCAC
Access time from CAS
–
–
–
ns
ns
ns
ns
ns
ns
ns
ns
ns
6,13
7,13
tAA
Access time from address
Column add hold from RAS
Read command setup time
Read command hold time to CAS
Read command hold time to RAS
Column address to RAS Lead time
CAS precharge time
–
–
–
tAR(R)
tRCS
26
0
28
0
30
0
–
–
–
tRCH
0
–
0
–
0
–
9
9
0
–
0
–
0
–
tRRH
tRAL
16
3
–
18
4
–
25
5
–
tCPN
tOFF
–
–
–
Output buffer turn-off time
0
8
0
8
0
8
8,10
Shaded areas contain advance information.
4/11/01; v.1.1
Alliance Semiconductor
4 of 24
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
