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128MSDRAM_2.fm - Rev. N 1/09 EN
50
1999 Micron Technology, Inc. All rights reserved.
128Mb: x4, x8, x16 SDRAM
Electrical Specifications
Table 17:
Electrical Characteristics and Recommended AC Operating Conditions
AC
Characteristics
Symbol
-6A
-7E
-75
Units
Notes
Parameter
Min
Max
Min
Max
Min
Max
Access time from CLK (positive
edge)
CL = 3
tAC(3)
–
5.4
–
5.4
ns
CL = 2
tAC(2)
–
5.4
–
6
ns
Address hold time
tAH
0.8
–
0.8
–
0.8
–
ns
Address setup time
tAS
1.5
–
1.5
–
1.5
–
ns
CLK high-level width
tCH
2.5
–
2.5
–
2.5
–
ns
CLK low-level width
tCL
2.5
–
2.5
–
2.5
–
ns
Clock cycle time
CL = 3
tCK(3)
6
–
7
–
7.5
–
ns
CL = 2
tCK(2)
–
7.5
–
10
–
ns
CKE hold time
tCKH
0.8
–
0.8
–
0.8
–
ns
CKE setup time
tCKS
1.5
–
1.5
–
1.5
–
ns
CS#, RAS#, CAS#, WE#, DQM hold time
tCMH
0.8
–
0.8
–
0.8
–
ns
CS#, RAS#, CAS#, WE#, DQM setup time
tCMS
1.5
–
1.5
–
1.5
–
ns
Data-in hold time
tDH
0.8
–
0.8
–
0.8
–
ns
Data-in setup time
tDS
1.5
–
1.5
–
1.5
–
ns
Data-out High-Z time
CL = 3
tHZ(3)
–
5.4
–
5.4
ns
CL = 2
tHZ(2)
–
5.4
–
6
ns
Data-out Low-Z time
tLZ
1–
ns
Data-out hold time (load)
tOH
3–
ns
Data-out hold time (no load)
tOHN
1.8
–
1.8
–
1.8
–
ns
ACTIVE-to-PRECHARGE command
tRAS
42
120,000
37
120,000
44
120,000
ns
ACTIVE-to-ACTIVE command period
tRC
60
–
60
–
66
–
ns
ACTIVE-to-READ or WRITE delay
tRCD
18–15
–20–
ns
Refresh period (4,096 rows)
tREF
–
64
–
64
–
64
ms
Refresh period - Automotive
(4,096 rows)
tREF
AT
–16–16
–16
ms
AUTO REFRESH period
tRFC
60–66
–66–
ns
PRECHARGE command period
tRP
18
–
15
–
20
–
ns
ACTIVE bank a to ACTIVE bank b
command
tRRD
12–14
–15–
ns
Transition time
tT
0.3
1.2
0.3
1.2
0.3
1.2
ns
WRITE recovery time
tWR
1 CLK
+ 7ns
–1 CLK
+ 7ns
–1 CLK
+ 7.5ns
––
12
–
14
–
15
–
ns
Exit SELF REFRESH to ACTIVE command
tXSR
67–67
–75–
ns
Table 18:
AC Functional Characteristics
Parameter
Symbol
-6A
-7E
-75
Units
Notes
READ/WRITE command to READ/WRITE command
tCCD
111
tCK
CKE to clock disable or power-down entry mode
tCKED
111
tCK
CKE to clock enable or power-down exit setup mode
tPED
1
tCK
DQM to input data delay
tDQD
000
tCK