64Mb: x4, x8, x16 SDRAM
Electrical Specifications – AC Operating Conditions
Electrical Specifications – AC Operating Conditions
Table 12: Electrical Characteristics and Recommended AC Operating Conditions
Notes 1–5 apply to all parameters and conditions
-6A6, 7
-6
-7E
-75
Note
Max Unit s
Parameter
Symbol
tAC(3)
tAC(2)
tAC(1)
tAH
Min
Max
5.4
7.5
17
–
Min
–
Max
5.5
7.5
17
–
Min
–
Max
Min
–
Access time from CL = 3
CLK (positive
edge)
–
5.4
5.4
–
5.4
6
–
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
8
8
8
CL = 2
CL = 1
–
–
–
–
–
–
–
–
Address hold time
Address setup time
0.8
1.5
2.5
2.5
6
1
0.8
1.5
2.5
2.5
7
–
0.8
1.5
2.5
2.5
7.5
10
–
–
tAS
–
1.5
2.5
2.5
6
–
–
–
CLK high-level width
CLK low-level width
tCH
tCL
–
–
–
–
–
–
–
–
Clock cycle time
CL = 3
tCK(3)
tCK(2)
tCK(1)
tCKH
tCKS
–
–
–
–
9
9
9
CL = 2
CL = 1
10
20
0.8
1.5
0.8
–
10
20
1
–
7.5
–
–
–
–
–
–
–
CKE hold time
CKE setup time
–
–
0.8
1.5
0.8
–
0.8
1.5
0.8
–
–
1.5
1
–
–
–
CS#, RAS#, CAS#, WE#,
DQM hold time
tCMH
–
–
–
CS#, RAS#, CAS#, WE#,
DQM setup time
tCMS
1.5
–
1.5
–
1.5
–
1.5
–
ns
Data-in hold time
tDH
tDS
tHZ(3)
tHZ(2)
tHZ(1)
tLZ
0.8
1.5
–
–
–
1
1.5
–
–
–
0.8
1.5
–
–
–
0.8
1.5
–
–
–
ns
ns
ns
ns
ns
ns
ns
Data-in setup time
Data-out High-Z CL = 3
time
5.4
7.5
17
–
5.5
7.5
17
–
5.4
5.4
–
5.4
6
10
10
10
CL = 2
CL = 1
–
–
–
–
–
–
–
–
–
Data-out Low-Z time
1
1
1
–
1
–
Data-out hold time
(load)
tOH
3
–
2
–
3
–
3
–
Data-out hold time (no
load)
tOHn
tRAS
tRC
1.8
42
60
18
–
–
1.8
42
60
18
–
–
1.8
37
60
15
–
–
1.8
44
66
20
–
–
ns
11
12
ACTIVE-to-PRECHARGE
command
120,000
120,000
120,000
120,000 ns
ACTIVE-to-ACTIVE com-
mand period
–
–
–
–
–
–
–
–
ns
ns
ACTIVE-to-READ or
WRITE delay
tRCD
tREF
Refresh period (4096
rows)
Refresh period – automo- tREFAT
tive (4096 rows)
64
16
–
64
16
–
64
16
–
64
16
–
ms
ms
ns
–
–
–
–
AUTO REFRESH period
tRFC
60
60
66
66
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23
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