AS4C1M16F5
®
AC parameters common to all waveforms
-45
-50
-60
Symbol
tRC
Parameter
Min
75
30
45
8
Max
–
Min
80
30
50
8
Max
–
Min
100
40
60
10
15
10
10
50
5
Max
–
Unit Notes
Random read or write cycle time
RAS precharge time
ns
ns
ns
ns
tRP
–
–
–
tRAS
tCAS
tRCD
tRAD
tRSH
tCSH
tCRP
tASR
tRAH
tT
RAS pulse width
10K
10K
35
25
–
10K
10K
35
25
–
10K
10K
43
30
–
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
15
8
15
9
ns
ns
ns
ns
ns
ns
ns
6
7
10
40
5
10
40
5
–
–
–
–
–
–
0
–
0
–
0
–
8
–
8
–
10
1
–
1
50
16
–
1
50
16
–
50
16
–
ns 4,5
tREF
tCP
–
–
–
ms
ns
ns
ns
ns
3
CAS precharge time
8
8
10
30
0
tRAL
tASC
tCAH
Column address to RAS lead time
Column address setup time
Column address hold time
25
0
–
25
0
–
–
–
–
–
8
–
8
–
10
–
Read cycle
-45
-50
-60
Symbol
tRAC
tCAC
tAA
Parameter
Min
–
Max
45
10
23
–
Min
–
Max
50
12
25
–
Min
–
Max
60
15
30
–
Unit Notes
ns
Access time from RAS
6
Access time from CAS
–
–
–
ns 6,13
ns 7,13
ns
Access time from address
Read command setup time
Read command hold time to CAS
Read command hold time to RAS
–
–
–
tRCS
0
0
0
tRCH
tRRH
0
–
0
–
0
–
ns
ns
9
9
0
–
0
–
0
–
3/22/02; v.0.9.2
Alliance Semiconductor
P. 5 of 22
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
