128Mb: x32 SDRAM
Electrical Specifications – AC Operating Conditions
Electrical Specifications – AC Operating Conditions
Table 12: Electrical Characteristics and Recommended AC Operating Conditions
Notes 1–6 apply to all parameters and conditions
-6A
Parameter
Access time from CLK (positive edge)
CL = 3
CL = 2
CL = 1
Address hold time
Address setup time
CLK high-level width
CLK low-level width
Clock cycle time
CL = 3
CL = 2
CL = 1
CKE hold time
CKE setup time
CS#, RAS#, CAS#, WE#, DQM hold time
CS#, RAS#, CAS#, WE#, DQM setup time
Data-in hold time
Data-in setup time
Data-out High-Z time
CL = 3
CL = 2
CL = 1
Data-out Low-Z time
Data-out hold time
ACTIVE-to-PRECHARGE command
ACTIVE-to-ACTIVE command period
AUTO REFRESH period
ACTIVE-to-READ or WRITE delay
Refresh period (4096 rows)
Refresh period – automotive (4096 rows)
PRECHARGE command period
ACTIVE bank
a
to ACTIVE bank
b
command
Transition time
WRITE recovery time
Symbol
t
AC(3)
t
AC(2)
t
AC(1)
t
AH
t
AS
t
CH
t
CL
t
CK(3)
t
CK(2)
t
CK(1)
t
CKH
t
CKS
t
CMH
t
CMS
t
DH
t
DS
t
HZ(3)
t
HZ(2)
t
HZ(1)
t
LZ
t
OH
t
RAS
t
RC
t
RFC
t
RCD
t
REF
t
REF
AT
-6
–
–
–
1.0
1.5
2.5
2.5
6
10
20
1.0
1.5
1.0
1.5
1.0
1.5
–
–
–
1
2
42
60
60
18
–
–
18
12
0.3
1
CLK
+ 6ns
12
70
5.5
7.5
17
–
–
–
–
–
–
–
–
–
–
–
–
–
5.5
7.5
17
–
–
120,0
00
–
–
–
64
16
–
–
1.2
–
–
–
–
1
2
2.75
2.75
7
10
20
1
2
1
2
1
2
–
–
–
1
2.5
42
70
70
20
–
–
20
15
0.3
-7
Notes
5.5
8
17
–
–
–
–
–
–
–
–
–
–
–
–
–
5.5
8
17
–
–
120,0
00
–
–
–
64
16
–
–
1.2
–
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
ms
ns
ns
ns
t
CK
Min Max Min Max Min Max Unit
–
–
–
0.8
1.5
2.5
2.5
6
10
20
0.8
1.5
0.8
1.5
0.8
1.5
–
–
–
1
3
42
60
60
18
–
–
18
12
0.3
1
CLK
+ 7ns
12
67
5.4
7.5
17
–
–
–
–
–
–
–
–
–
–
–
–
–
5.4
7.5
17
–
–
120,0
00
–
–
–
64
16
–
–
1.2
–
t
RP
t
RRD
t
T
t
WR
1
CLK
+ 7ns
14
70
–
–
–
–
–
–
ns
ns
Exit SELF REFRESH-to-ACTIVE command
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128mb_x32_sdram.pdf - Rev. U 04/13 EN
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