W3DG7268V-D1 Datasheet, PDF (6/10 Pages) White Electronic Designs Corporation – 512MB- 64Mx72 SDRAM UNBUFFERED

White Electronic Designs
W3DG7268V-D1
-JD1
PRELIMINARY
AC FUNCTIONAL CHARACTERISTICS
PARAMETER
SYMBOL
7
READ/WRITE command to READ/WRITE command
tCCD
1
CKE to clock disable or power-down entry mode
tCKED
1
CKE to clock enable or power-down exit setup mode
tPED
1
DQM to input data delay
tDQD
0
DQM to data mask during WRITEs
tDQM
0
DQM to data high-impedance during READs
tDQZ
2
WRITE command to input data delay
tDWD
0
Data-in to ACTIVE command
tDAL
4
Data-in to PRECHARGE command
tDPL
2
Last data-in to burst STOP command
tBDL
1
Last data-in to new READ/WRITE command
tCDL
1
Last data-in to PRECHARGE command
tRDL
2
LOAD MODE REGISTER command to ACTIVE or REFRESH
command
tMRD
2
Data-out to high-impedance from PRECHARGE command
CL = 3
tROH(3)
3
CL = 2
tROH(2)
2
75/10
1
1
1
0
0
2
0
5
2
1
1
2
2
3
2
UNITS
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
tCK
NOTES
17
14
14
17
17
17
17
15, 21
16, 21
17
17
16, 21
26
17
17
October 2004
Rev. 2
6
White Electronic Designs Corporation • [phone] • www.wedc.com