Internet Data Sheet
HYS[64/72]T256020EU-[25F/2.5/3/3S/3.7]-B
Unbuffered DDR2 SDRAM Module
3.3.2
Component AC Timing Parameters
Timing Parameters: Table 15 for DDR2–800, Table 16 for DDR2–667 and Table 17 for DDR2–533C.
TABLE 15
DRAM Component Timing Parameter by Speed Grade - DDR2–800
Parameter
Symbol
DDR2–800
Unit
Note1)2)3)4)5)6)7)
8)
Min.
Max.
9)
DQ output access time from CK / CK
DQS output access time from CK / CK
Average clock high pulse width
Average clock low pulse width
Average clock period
tAC
–400
–350
0.48
0.48
2500
50
+400
+350
0.52
0.52
8000
––
ps
9)
tDQSCK
tCH.AVG
tCL.AVG
tCK.AVG
tDS.BASE
tDH.BASE
ps
10)11)
10)11)
10)11)
12)13)14)
13)14)15)
tCK.AVG
tCK.AVG
ps
DQ and DM input setup time
DQ and DM input hold time
ps
125
––
ps
Control & address input pulse width for each input tIPW
0.6
—
tCK.AVG
tCK.AVG
ps
DQ and DM input pulse width for each input
Data-out high-impedance time from CK / CK
DQS/DQS low-impedance time from CK / CK
DQ low impedance time from CK/CK
tDIPW
tHZ
tLZ.DQS
tLZ.DQ
0.35
—
—
9)16)
9)16)
9)16)
17)
tAC.MAX
tAC.MAX
tAC.MAX
200
tAC.MIN
2 x tAC.MIN
—
ps
ps
DQS-DQ skew for DQS & associated DQ signals tDQSQ
ps
18)
CK half pulse width
tHP
Min(tCH.ABS
,
__
ps
tCL.ABS
)
19)
20)
DQ hold skew factor
tQHS
tQH
—
300
—
ps
DQ/DQS output hold time from DQS
t
HP – tQHS
ps
Write command to DQS associated clock edges WL
RL – 1
– 0.25
nCK
tCK.AVG
21)
DQS latching rising transition to associated clock tDQSS
+ 0.25
edges
DQS input high pulse width
DQS input low pulse width
DQS falling edge to CK setup time
DQS falling edge hold time from CK
Write postamble
tDQSH
tDQSL
tDSS
0.35
0.35
0.2
—
tCK.AVG
tCK.AVG
tCK.AVG
tCK.AVG
tCK.AVG
tCK.AVG
ps
—
21)
21)
—
tDSH
0.2
—
tWPST
tWPRE
tIS.BASE
tIH.BASE
tRPRE
tRPST
tRRD
0.4
0.6
—
Write preamble
0.35
175
250
0.9
22)23)
23)24)
25)26)
25)27)
28)
Address and control input setup time
Address and control input hold time
Read preamble
—
—
ps
1.1
0.6
—
tCK.AVG
tCK.AVG
ns
Read postamble
0.4
Active to active command period for 1KB page
size products
7.5
28)
28)
Active to active command period for 2KB page
size products
tRRD
10
35
—
—
ns
ns
Four Activate Window for 1KB page size products tFAW
Rev. 1.0, 2006-10
19
10262006-SX8C-DEY8
QIMONDA [ QIMONDA AG ]
