W3EG7264S-AD4 Datasheet, PDF (8/13 Pages) White Electronic Designs Corporation – 512MB - 2x32Mx72 DDR ECC SDRAM UNBUFFERED w/PLL

White Electronic Designs
W3EG7264S-AD4
-BD4
PRELIMINARY
DDR SDRAM COMPONENT ELECTRICAL CHARACTERISTICS AND RECOMMENDED AC
OPERATING CONDITIONS (Continued)
AC CHARACTERISTICS
PARAMETER
DQS write postamble
Write recovery time
Internal WRITE to READ command delay
Data valid output window
REFRESH to REFRESH command interval
Average periodic refresh interval
Terminating voltage delay to VCC
Exit SELF REFRESH to non-READ command
Exit SELF REFRESH to READ command
SYMBOL
tWPST
tWR
tWTR
na
tREFC
tREFI
tVTD
tXSNR
tXSRD
335
MIN MAX
0.4 0.6
15
1
tQH - tDQSQ
70.3
7.8
0
75
200
262
MIN MAX
0.4 0.6
15
1
tQH - tDQSQ
70.3
7.8
0
75
200
265
MIN MAX
0.4 0.6
15
1
tQH - tDQSQ
70.3
7.8
0
75
200
202
MIN MAX
0.4 0.6
15
1
tQH - tDQSQ
70.3
7.8
0
75
200
UNITS NOTES
tCK
17
ns
tCK
ns 22
µs 21
µs 21
ns
ns
tCK
January 2005
Rev. 3
8
White Electronic Designs Corporation • [phone] • www.wedc.com