HYS64T256020EU-25F-B Datasheet, PDF (22/60 Pages) Qimonda AG – 240-Pin unbuffered DDR2 SDRAM Modules

Internet Data Sheet
HYS[64/72]T256020EU-[25F/2.5/3/3S/3.7]-B
Unbuffered DDR2 SDRAM Module
TABLE 16
DRAM Component Timing Parameter by Speed Grade - DDR2–667
Parameter
Symbol
DDR2–667
Min.
Max.
Unit
Note^{1)2)3)4)5)6)7)}
8)
DQ output access time from CK / CK
t_AC
DQS output access time from CK / CK
t_DQSCK
Average clock high pulse width
t_CH.AVG
Average clock low pulse width
t_CL.AVG
Average clock period
t_CK.AVG
DQ and DM input setup time
t_DS.BASE
DQ and DM input hold time
t_DH.BASE
Control & address input pulse width for each input t_IPW
DQ and DM input pulse width for each input
t_DIPW
Data-out high-impedance time from CK / CK
t_HZ
DQS/DQS low-impedance time from CK / CK
t_LZ.DQS
DQ low impedance time from CK/CK
t_LZ.DQ
DQS-DQ skew for DQS & associated DQ signals t_DQSQ
CK half pulse width
t_HP
DQ hold skew factor
t_QHS
DQ/DQS output hold time from DQS
t_QH
Write command to DQS associated clock edges WL
DQS latching rising transition to associated clock t_DQSS
edges
–450
–400
0.48
0.48
3000
100
175
0.6
0.35
—
t_AC.MIN
2 x t_AC.MIN
—
Min(t_CH.ABS,
t_CL.ABS)
—
t_HP – t_QHS
RL–1
– 0.25
+450
+400
0.52
0.52
8000
––
––
—
—
t_AC.MAX
t_AC.MAX
t_AC.MAX
240
__
340
—
+ 0.25
ps
ps
t_CK.AVG
t_CK.AVG
ps
ps
ps
t_CK.AVG
t_CK.AVG
ps
ps
ps
ps
ps
9)
9)
10)11)
10)11)
12)13)14)
13)14)15)
9)16)
9)16)
9)16)
17)
18)
ps
19)
ps
20)
nCK
t ²¹⁾
CK.AVG
DQS input high pulse width
t_DQSH
0.35
—
DQS input low pulse width
t_DQSL
0.35
—
DQS falling edge to CK setup time
t_DSS
0.2
—
DQS falling edge hold time from CK
t_DSH
0.2
—
Write postamble
t_WPST
0.4
0.6
Write preamble
t_WPRE
0.35
—
Address and control input setup time
t_IS.BASE
200
—
Address and control input hold time
t_IH.BASE
275
—
Read preamble
t_RPRE
0.9
1.1
Read postamble
t_RPST
0.4
0.6
Active to active command period for 1KB page t_RRD
7.5
—
size products
Active to active command period for 2KB page t_RRD
10
—
size products
Four Activate Window for 1KB page size products t_FAW
37.5
—
Four Activate Window for 2KB page size products t_FAW
50
—
CAS to CAS command delay
t_CCD
2
—
Write recovery time
t_WR
15
—
t_CK.AVG
t_CK.AVG
t_CK.AVG
t_CK.AVG
t_CK.AVG
t_CK.AVG
ps
ps
t_CK.AVG
t_CK.AVG
ns
21)
21)
22)23)
23)24)
25)26)
25)27)
28)
ns
28)
ns
28)
ns
28)
nCK
ns
28)
Rev. 1.0, 2006-10
22
10262006-SX8C-DEY8