參數(shù)資料
型號: W3EG2256M72ASSR262JD3MG
廠商: MICROSEMI CORP-PMG MICROELECTRONICS
元件分類: DRAM
英文描述: 512M X 72 DDR DRAM MODULE, 0.7 ns, DMA184
封裝: ROHS COMPLIANT, DIMM-184
文件頁數(shù): 14/14頁
文件大?。?/td> 217K
代理商: W3EG2256M72ASSR262JD3MG
W3EG2256M72ASSR-JD3
-AJD3
9
White Electronic Designs
November, 04
Rev. 3
PRELIMINARY
White Electronic Designs Corporation (602) 437-1520 www.wedc.com
DDR SDRAM COMPONENT ELECTRICAL CHARACTERISTICS AND
RECOMMENDED AC OPERATING CONDITIONS (continued)
AC Characteristics
262
263/265
202
Parameter
Symbol
Min
Max
Min
Max
Min
Max
Units
Notes
ACTIVE to READ or WRITE delay
tRCD
15
20
ns
PRECHARGE command period
tRP
15
20
ns
DQS read preamble
tRPRE
0.9
1.1
0.9
1.1
0.9
1.1
tCK
19
DQS read postamble
tRPST
0.4
0.6
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
0.4
0.6
tCK
9
Write recovery time
tWR
15
ns
Internal WRITE to READ command delay
tWTR
111
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
000
ns
Exit SELF REFRESH to non-READ command
tXSNR
75
ns
Exit SELF REFRESH to READ command
tXSRD
200
tCK
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