W3EG6467S-D4 Datasheet, PDF (8/12 Pages) White Electronic Designs Corporation – 512MB - 2x32Mx64 DDR SDRAM UNBUFFERED

White Electronic Designs
W3EG6467S-D4
ADVANCED
DDR SDRAM COMPONENT ELECTRICAL CHARACTERISTICS AND
RECOMMENDED AC OPERATING CONDITIONS (Continued)
DDR400: VCC = VCCQ = +2.6V ± 0.1V
AC CHARACTERISTICS
403
355
262
265
202
PARAMETER
DQS write postamble
Write recovery time
SYMBOL MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX UNITS NOTES
tWPST 0.4 0.6 0.4 0.6 0.4 0.6 0.4 0.6 0.4 0.6 tCK 17
tWR
15
15
15
15
15
ns
Internal WRITE to READ command delay
tWTR
2
1
1
1
1
tCK
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
na
tQH - tDQSQ tQH - tDQSQ tQH - tDQSQ
tQH - tDQSQ
tQH - tDQSQ
ns 22
tREFC
70.3
70.3
70.3
70.3
70.3 µs 21
tREFI
7.8
7.8
7.8
7.8
7.8 µs 21
tVTD
0
0
0
0
0
ns
tXSNR 75
75
75
75
80
ns
tXSRD 200
200
200
200
200
tCK
White Electronic Designs Corp. reserves the right to change products or specifications without notice.
January 2005
Rev. 1
8
White Electronic Designs Corporation • [phone] • www.wedc.com