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WV3H2256M72AER403D6MG Datasheet(PDF) 7 Page - White Electronic Designs Corporation

Part # WV3H2256M72AER403D6MG
Description  4GB - 2x256Mx72 DDR2 SDRAM RDIMM, w/PLL
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Manufacturer  WEDC [White Electronic Designs Corporation]
Direct Link  http://www.whiteedc.com
Logo WEDC - White Electronic Designs Corporation

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WV3HG2256M72AER-D6
ADVANCED
7
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
White Electronic Designs
April 2006
Rev. 1
AC TIMING PARAMETERS
VCC = +1.8V ± 0.1V
AC Characteristics
806
665
534
403
Parameter
Symbol
Min
Max
Min
Max
Min
Max
Min
Max
Unit
Clock cycle time
CL = 6
tCK (6)
TBD
TBD
ps
CL = 5
tCK (5)
TBD
TBD
3,000
8,000
ps
CL = 4
tCK (4)
TBD
TBD
3,750
8,000
3,750
8,000
5,000
8,000
ps
CL = 3
tCK (3)
TBD
TBD
5,000
8,000
5,000
8,000
5,000
8,000
ps
CK high-level width
tCH
TBD
TBD
0.45
0.55
0.45
0.55
0.45
0.55
tCK
CK low-level width
tCL
TBD
TBD
0.45
0.55
0.45
0.55
0.45
0.55
tCK
Half clock period
tHP
TBD
TBD
MIN
(tCH,
tCL)
MIN
(tCH,
tCL)
MIN
(tCH,
tCL)
ps
Clock jitter
tJIT
TBD
-
125
125
-
125
125
-
125
125
ps
DQ output access time from CK/CK#
tAC
TBD
TBD
-450
+450
-500
+500
-600
+600
ps
Data-out high-impedance window from CK/CK#
tHZ
TBD
TBD
tAC
(MAX)
tAC
(MAX)
tAC
(MAX)
ps
Data-out low-impedance window from CK/CK#
tLZ
TBD
TBD
tAC
(MIN)
tAC
(MAX)
tAC
(MIN)
tAC
(MAX)
tAC
(MIN)
tAC
(MAX)
ps
DQ and DM input setup time relative to DQS
tDS
TBD
TBD
100
100
150
tCK
DQ and DM input hold time relative to DQS
tDH
TBD
TBD
175
225
275
ps
DQ…DQS hold, DQS to first DQ to go nonvalid,
per access relative to DQS
tDIPW
TBD
TBD
0.35
0.35
0.35
ps
Data hold skew factor
tQHS
TBD
TBD
340
400
450
DQ–DQS hold, DQS to first DQ to go nonvalid,
per access
tQH
TBD
TBD
tHP-
tQHS
tHP-
tQHS
tHP-
tQHS
Data valid output window (DVW)
tDVW
TBD
TBD
tQH-
tDQSQ
tQH-
tDQSQ
tQH-
tDQSQ
DQS input high pulse width
tDQSH
TBD
TBD
0.35
0.35
0.35
tCK
DQS input low pulse width
tDQSL
TBD
TBD
0.35
0.35
0.35
tCK
DQS output access time from CK/CK#
tDQSCK
TBD
TBD
-400
+400
-450
+450
-500
+500
ps
DQS falling edge to CK rising– setup time
tDSS
TBD
TBD
0.2
0.2
0.2
tCK
DQS falling edge from CK rising – hold time
tDSH
TBD
TBD
0.2
0.2
0.2
tCK
DQS–DQ skew, DQS to last DQ valid, per group,
per access
tDQSQ
TBD
TBD
240
300
350
ps
DQS read preamble
tRPRE
TBD
TBD
0.9
1.1
0.9
1.1
0.9
1.1
tCK
Note:
• AC specification is based on SAMSUNG components. Other DRAM manufactures specification may be different.
Continued on next page


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