W3EG6462S-D3 Datasheet, PDF (8/13 Pages) White Electronic Designs Corporation – 512MB - 2x32Mx64 DDR SDRAM UNBUFFERED

White Electronic Designs
W3EG6462S-D3
-JD3
ADVANCED
DDR SDRAM COMPONENT ELECTRICAL CHARACTERISTICS AND
RECOMMENDED AC OPERATING CONDITIONS (continued)
AC CHARACTERISTICS
403
335
262
263/265
202
PARAMETER
SYMBOL MIN MAX MIN MAX MIN MAX MIN MAX MIN MAX UNITS NOTES
Address and control input setup time (slow slew rate) tISS 0.6
0.80
1
1
1
ns 12
Address and Control input pulse width (for each
tIPW
2.2
2.2
2.2
2.2
2.2
ns
input)
LOAD MODE REGISTER command cycle time
DQ-DQS hold, DQS to first DQ to go non-valid, per
access
Data hold skew factor
ACTIVE to PRECHARGE command
ACTIVE to READ with Auto precharge command
ACTIVE to ACTIVE/AUTO REFRESH command
period
AUTO REFRESH command period
ACTIVE to READ or WRITE delay
PRECHARGE command period
DQS read preamble
DQS read postamble
ACTIVE bank a to ACTIVE bank b command
DQS write preamble
DQS write preamble setup time
DQS write postamble
Write recovery time
Internal WRITE to READ command delay
Data valid output window
REFRESH to REFRESH command
Average periodic refresh interval
Terminating voltage delay to VCC
Exit SELF REFRESH to non-READ command
Exit SELF REFRESH to READ command
tMRD
2
12
15
15
15
ns
tQH
tHP
- tQHS
tHP
- tQHS
tHP
- tQHS
tHP
- tQHS
tHP
- tQHS
ns 22, 23
tQHS
0.50
0.55
0.75
0.75
0.75 ns
tRAS 40 70,000 42 70,000 40 120,000 40 120,000 40 120,000 ns 31, 48
tRAP
15
15
15
20
20
ns
tRC
55
60
60
65
65
ns
tRFC
tRCD
tRP
tRPRE
tRPST
tRRD
tWPRE
tWPRES
tWPST
tWR
tWTR
na
tREFC
tREFI
tVTD
tXSNR
tXSRD
70
15
15
0.9
0.4
10
0.25
0
0.4
15
2
tQH - tDQSQ
70.3
7.8
0
75
200
75
15
15
0.9 1.1
0.4 0.6
12
0.25
0
0.4 0.6
15
1
tQH - tDQSQ
70.3
7.8
0
75
200
75
15
15
0.9 1.1
0.4 0.6
15
0.25
0
0.4 0.6
15
1
tQH - tDQSQ
70.3
7.8
0
75
200
75
20
20
0.9 1.1
0.4 0.6
15
0.25
0
0.4 0.6
15
1
tQH - tDQSQ
70.3
7.8
0
75
200
75
20
20
0.9 1.1
0.4 0.6
15
0.25
0
0.4 0.6
15
1
tQH - tDQSQ
70.3
7.8
0
75
200
ns 43
ns
ns
tCK 37
tCK 37
ns
tCK
ns 18, 19
tCK 17
ns
tCK
ns 22
µs 21
µs 21
ns
ns
tCK
May 2005
Rev. 4
8
White Electronic Designs Corporation • [phone] • www.wedc.com