參數(shù)資料
型號(hào): W3EG7262S265D3SG
廠商: WHITE ELECTRONIC DESIGNS CORP
元件分類(lèi): DRAM
英文描述: 64M X 72 DDR DRAM MODULE, 0.75 ns, DMA184
封裝: ROHS COMPLIANT, DIMM-184
文件頁(yè)數(shù): 11/12頁(yè)
文件大?。?/td> 218K
代理商: W3EG7262S265D3SG
W3EG7262S-D3
-JD3
8
White Electronic Designs Corporation (602) 437-1520 www.wedc.com
White Electronic Designs
May 2005
Rev. 3
PRELIMINARY
DDR SDRAM COMPONENT ELECTRICAL CHARACTERISTICS AND
RECOMMENDED AC OPERATING CONDITIONS (continued)
0°C ≤ TA ≤ +70°C; VCC = +2.5V ± 0.2V, VCCQ = +2.5V ± 0.2V
AC Characteristics
262
265, 202
Parameter
Symbol
Min
Max
Min
Max
Units
Notes
ACTIVE to READ or WRITE delay
tRCD
20
ns
PRECHARGE command period
tRP
20
ns
DQS read preamble
tRPRE
0.9
1.1
0.9
1.1
tCK
19
DQS read postamble
tRPST
0.4
0.6
0.4
0.6
tCK
ACTIVE bank a to ACTIVE bank b command
tRRD
15
ns
DQS write preamble
tWPRE
0.25
tCK
DQS write preamble setup time
tWPRES
0
ns
10,11
DQS write postamble
tWPST
0.4
0.6
0.4
0.6
tCK
9
Write recovery time
tWR
15
ns
Internal WRITE to READ command delay
tWTR
11
tCK
Data valid output window
NA
tQH-tDQSQ
ns
13
REFRESH to REFRESH command interval
tREFC
70.3
μs
12
Average periodic refresh interval
tREFI
7.8
μs
12
Terminating voltage delay to VCC
tVTD
00
ns
Exit SELF REFRESH to non-READ command
tXSNR
75
ns
Exit SELF REFRESH to READ command
tXSRD
200
tCK
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