W3DG7268V-D1 Datasheet, PDF (5/10 Pages) White Electronic Designs Corporation – 512MB- 64Mx72 SDRAM UNBUFFERED

White Electronic Designs
W3DG7268V-D1
-JD1
PRELIMINARY
ELECTRICAL CHARACTERISTICS AND RECOMMENDED AC OPERATING CONDITIONS
AC CHARACTERISTICS
7
75/10
PARAMETER
Access time from CLK (pos. edge)
Address hold time
Address setup time
CLK high-level width
CLK low-level width
Clock cycle time
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-impedance time
Data-out low-impedance time
Data-out hold time (load)
Data-out hold time (no load)
ACTIVE to PRECHARGE command
ACTIVE to ACTIVE command period
ACTIVE to READ or WRITE delay
Refresh period (8,192 rows)
AUTO REFRESH period
PRECHARGE command period
ACTIVE bank a to ACTIVE bank b command
Transition time
WRITE recovery time
Exit SELF REFRESH to ACTIVE command
CL = 3
CL = 2
CL = 3
CL = 2
CL = 3
CL = 2
SYMBOL
tAC(3)
tAC(2)
tAH
tAS
tCH
tCL
tCK(3)
tCK(2)
tCKH
tCKS
tCMH
tCMS
tDH
tDS
tHZ(3)
tHZ(2)
tLZ
tOH
tOHN
tRAS
tRC
tRCD
tREF
tRFC
tRP
tRRD
tT
tWR
tXSR
MIN
0.8
1.5
2.5
2.5
7
7.5
0.8
1.5
0.8
1.5
0.8
1.5
1
2.7
1.8
37
60
15
66
15
14
0.3
1 CLK +
7ns
14
67
MAX
5.4
5.4
5.4
5.4
120K
64
1.2
MIN
0.8
1.5
2.5
2.5
7.5
10
0.8
1.5
0.8
1.5
0.8
1.5
1
2.7
1.8
44
66
20
66
20
15
0.3
1 CLK +
7ns
15
75
MAX
5.4
6
5.4
6
120K
64
1.2
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
ns
ns
ns
ns
-
NOTES
27
23
23
10
10
28
7
24
ns
14, 25
ns
20
October 2004
Rev. 2
5
White Electronic Designs Corporation • [phone] • www.wedc.com