AS4LC256K16EO
®
AC parameters common to all waveforms
-35
-45
-60
Std Symbol Parameter
Min
50
15
35
6
Max
Min
80
20
45
10
18
13
10
45
5
Max
–
Min
100
20
60
10
15
15
12
60
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
ns
CAS pulse width
–
RAS to CAS delay time
RAS to column address delay time
CAS to RAS hold time (read cycle)
RAS to CAS hold time
12
8
18
14
–
32
23
–
45 ns
30 ns
6
7
10
35
5
–
–
–
–
–
ns
ns
ns
ns
ns
–
–
CAS to RAS precharge time
Row address setup time
Row address hold time
Transition time (rise and fall)
Refresh period
–
–
0
–
0
–
0
6
–
8
–
9
1.5
–
50
8
1.5
–
50
8
1.5
–
50 ns
4,5
3
tREF
tCLZ
8
–
ms
ns
CAS to output in low Z
0
–
3
–
3
8
Read cycle
-35
-45
-60
Std Symbol Parameter
Min
–
Max
35
7
Min
–
Max
45
10
22
–
Min
–
Max
Unit Notes
tRAC
tCAC
tAA
Access time from RAS
60 ns
10 ns
30 ns
6
Access time from CAS
–
–
–
6,13
7,13
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
–
17
–
–
–
tAR(R)
tRCS
tRCH
28
0
35
0
40
0
–
–
–
–
–
–
ns
–
–
ns
ns
ns
ns
ns
0
–
0
–
0
9
9
0
–
0
–
0
tRRH
tRAL
18
4
–
25
5
–
30
5
tCPN
tOFF
–
–
Output buffer turn-off time
0
8
0
10
0
10 ns
8,10
4/11/01; V.1.1
Alliance Semiconductor
P. 5 of 25
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
