AS4C4M4EOQ
AS4C4M4E1Q
®
AC parameters common to all waveforms
-50
Symbol Parameter
t
RC
t
RP
t
RAS
t
CAS
t
RCD
t
RAD
t
RSH
t
CSH
t
CRP
t
ASR
t
RAH
t
T
t
REF
t
CP
t
RAL
t
ASC
t
CAH
Random read or write cycle time
RAS precharge time
RAS pulse width
CAS pulse width
RAS to CAS delay time
RAS to column address delay time
CAS to RAS hold time
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
CAS precharge time
Column address to RAS lead time
Column address setup time
Column address hold time
Min
80
30
50
8
15
12
10
40
5
0
8
1
–
8
25
0
8
Max
–
–
10K
10K
35
25
–
–
–
–
–
50
32/64
–
–
–
Min
100
40
60
10
15
12
10
50
5
0
10
1
–
10
30
0
10
-60
Max
–
–
10K
10K
43
30
–
–
–
–
–
50
32/64
–
–
–
–
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
ns
ns
ns
ns
4,5
17/16
6
7
Notes
Read cycle
-50
Symbol Parameter
t
RAC
t
CAC
t
AA
t
RCS
t
RCH
t
RRH
Access time from RAS
Access time from CAS
Access time from address
Read command setup time
Read command hold time to CAS
Read command hold time to RAS
Min
–
–
–
0
0
0
Max
50
12
25
–
–
–
Min
–
–
–
0
0
0
-60
Max
60
15
30
–
–
–
Unit
ns
ns
ns
ns
ns
ns
9
9
Notes
6
6,13
7,13
3/22/01; v.1.0
Alliance Semiconductor
P. 6 of 16
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
