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參數資料
| 型號： | W3EG7218S265BD4 |
| 英文描述： | 128MB - 16Mx72 DDR SDRAM UNBUFFERED w/PLL |
| 中文描述： | 128MB的- 16Mx72 DDR SDRAM的緩沖瓦特/鎖相環 |
| 文件頁數： | 8/13頁 |
| 文件大小： | 177K |
| 代理商： | W3EG7218S265BD4 |
8
White Electronic Designs Corporation (602) 437-1520 www.wedc.com
White Electronic Designs
November 2004
Rev. 1
PRELIMINARY
W3EG7218S-AD4
-BD4
ELECTRICAL CHARACTERISTICS AND RECOMMENDED AC OPERATING CONDITIONS
(continued)
AC CHARACTERISTICS
262
265/202
UNITS
NOTES
PARAMETER
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 (DVW)
REFRESH to REFRESH command interval
Average periodic refresh interval
Terminating voltage delay to VDD
Exit SELF REFRESH to non-READ command
Exit SELF REFRESH to READ command
SYMBOL
t
QH
t
QHS
t
RAS
t
RAP
t
RC
t
RFC
t
RCD
t
RP
t
RPRE
t
RPST
t
RRD
t
WPRE
t
WPRES
t
WPST
t
WR
t
WTR
MIN
t
HP -
t
QHS
MAX
MIN
t
HP -
t
QHS
MAX
ns
ns
ns
ns
ns
ns
ns
ns
t
CK
t
CK
ns
t
CK
ns
tCK
ns
t
CK
ns
μs
μs
ns
ns
t
CK
22, 23
0.75
120,000
0.75
120,000
40
15
60
75
15
15
0.9
0.4
15
0.25
0
0.4
15
1
40
20
65
75
20
20
0.9
0.4
15
0.25
0
0.4
15
1
31, 48
43
1.1
0.6
1.1
0.6
38
38
18, 19
17
0.6
0.6
na
t
QH -
t
DQSQ
t
QH -
t
DQSQ
22
21
21
t
REFC
t
REFI
t
VTD
t
XSNR
t
XSRD
140.6
15.6
140.6
15.6
0
0
75
200
75
200
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相關代理商/技術參數 |
參數描述 |
|---|---|
| W3EG7218S-AD4 | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:128MB - 16Mx72 DDR SDRAM UNBUFFERED w/PLL |
| W3EG7218S-BD4 | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:128MB - 16Mx72 DDR SDRAM UNBUFFERED w/PLL |
| W3EG72255MS100AJD3MG | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:2GB - 2x128Mx72 DDR SDRAM REGISTERED ECC, w/PLL |
| W3EG72255MS100AJD3SG | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:2GB - 2x128Mx72 DDR SDRAM REGISTERED ECC, w/PLL |
| W3EG72255MS100JD3MG | 制造商:WEDC 制造商全稱:White Electronic Designs Corporation 功能描述:2GB - 2x128Mx72 DDR SDRAM REGISTERED ECC, w/PLL |
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