WV3HG2128M72AER-D6 Datasheet, PDF (7/11 Pages) White Electronic Designs Corporation – 2GB - 2x128Mx72 DDR2 SDRAM REGISTERED, w/PLL

White Electronic Designs ^{WV3HG2128M72AER-D6}
ADVANCED*
AC TIMING PARAMETERS & SPECIFICATIONS
0°C ≤ TA ≤ +70°C; VCCQ = + 1.8V ± 0.1V, VCC = +1.8V ± 0.1V
AC CHARACTERISTICS
534
403
PARAMETER
Clock cycle time
CL = 4
CL = 3
SYMBOL
tCK (4)
tCK (3)
MIN
3,750
5,000
MAX
8,000
8,000
MIN
5,000
5,000
MAX
UNIT
8,000
ps
8,000
ps
CK high-level width
tCH
0.45
0.55
0.45
0.55
tCK
CK low-level width
tCL
0.45
0.55
0.45
0.55
tCK
Half clock period
tHP
MIN (tCH, tCL)
MIN (tCH, tCL)
ps
Clock jitter
tJIT
TBD
TBD
ps
DQ output access time from CK/CK#
tAC
-500
+500
-600
+600
ps
Data-out high-impedance window from CK/CK#
tHZ
tAC MAX
tAC MAX
ps
Data-out low-impedance window from CK/CK#
tLZ
tAC MIN
tAC MAX
tAC MIN
tAC MAX
ps
DQ and DM input setup time relative to DQS
tDS
100
150
DQ and DM input hold time relative to DQS
tDH
225
275
A DQ and DM input pulse width (for each input)
tDIPW
0.35
0.35
tCK
Data hold skew factor
tQHS
400
450
ps
DQ…DQS hold, DQS to first DQ to go nonvalid, per access
tQH
tHP - tQHS
tHP - tQHS
ps
Data valid output window (DVW)
tDVW
tQH - tDQSQ
tQH - tDQSQ
ns
DQS input high pulse width
tDQSH
0.35
0.35
tCK
DQS input low pulse width
tDQSL
0.35
0.35
tCK
DQS output access time from CK/CK#
tDQSCK
-450
+450
-500
+500
ps
DQS falling edge to CK rising … setup time
tDSS
0.2
0.2
tCK
DQS falling edge from CK rising … hold time
tDSH
0.2
0.2
tCK
DQS…DQ skew, DQS to last DQ valid, per group,
per access
tDQSQ
300
350
ps
DQS read preamble
tRPRE
0.9
1.1
0.9
1.1
tCK
DQS read postamble
tRPST
0.4
0.6
0.4
0.6
tCK
DQS write preamble setup time
tWPRES
0
0
ps
DQS write preamble
tWPRE
0.35
0.35
tCK
DQS write postamble
tWPST
0.4
0.6
0.4
0.6
tCK
Write command to first DQS latching transition
tDQSS
WL - 0.25 WL + 0.25 WL - 0.25 WL + 0.25
tCK
Notes:
AC specification is based on SAMSUNG components. Other DRAM manufacturers specification may be different.
Continued on next page
September
2005 Rev. 0
7
White Electronic Designs Corporation • [phone] • www.wedc.com