Internet Data Sheet
Rev. 1.02, 2007-07
03292006-08VU-L8WK
19
HYS72T[64/128/256]xx0HP–[3S/3.7]–A
Registered DDR2 SDRAM Modules
3.3.2
Component AC Timing Parameters
Speed Grade Definitions for: DDR2–667 (
Table 14
), DDR2–533C (
Table 15
)
TABLE 14
DRAM Component Timing Parameter by Speed Grade - DDR2–667
Parameter
Symbol
DDR2–667
Unit
Notes
1)2)3)4)5)6)
7)8)
Min.
Max.
DQ output access time from CK / CK
CAS to CAS command delay
Average clock high pulse width
Average clock period
CKE minimum pulse width ( high and low pulse
width)
Average clock low pulse width
Auto-Precharge write recovery + precharge time
Minimum time clocks remain ON after CKE
asynchronously drops LOW
DQ and DM input hold time
DQ and DM input pulse width for each input
DQS output access time from CK / CK
DQS input high pulse width
DQS input low pulse width
DQS-DQ skew for DQS & associated DQ signals
t
DQSQ
DQS latching rising transition to associated clock
edges
DQ and DM input setup time
DQS falling edge hold time from CK
DQS falling edge to CK setup time
CK half pulse width
t
AC
t
CCD
t
CH.AVG
t
CK.AVG
t
CKE
–450
2
0.48
3000
3
+450
—
0.52
8000
—
ps
nCK
t
CK.AVG
ps
nCK
9)
10)11)
12)
t
CL.AVG
t
DAL
t
DELAY
0.48
WR +
t
nRP
t
IS
+
t
CK .AVG
+
t
IH
175
0.35
–400
0.35
0.35
—
– 0.25
0.52
—
––
t
CK.AVG
nCK
ns
10)11)
13)14)
t
DH.BASE
t
DIPW
t
DQSCK
t
DQSH
t
DQSL
––
—
+400
—
—
240
+ 0.25
ps
t
CK.AVG
ps
t
CK.AVG
t
CK.AVG
ps
t
CK.AVG
19)20)15)
9)
16)
t
DQSS
17)
t
DS.BASE
t
DSH
t
DSS
t
HP
100
0.2
0.2
Min(
t
CH.ABS
,
t
CL.ABS
)
—
275
0.6
200
2 x
t
AC.MIN
t
AC.MIN
0
2
0
t
HP
–
t
QHS
—
––
—
—
__
ps
t
CK.AVG
t
CK.AVG
ps
18)19)20)
17)
17)
21)
Data-out high-impedance time from CK / CK
Address and control input hold time
Control & address input pulse width for each input
t
IPW
Address and control input setup time
DQ low impedance time from CK/CK
DQS/DQS low-impedance time from CK / CK
MRS command to ODT update delay
Mode register set command cycle time
OCD drive mode output delay
DQ/DQS output hold time from DQS
DQ hold skew factor
t
HZ
t
IH.BASE
t
AC.MAX
—
—
—
t
AC.MAX
t
AC.MAX
12
—
12
—
340
ps
ps
t
CK.AVG
ps
ps
ps
ns
nCK
ns
ps
ps
9)22)
25)23)
t
IS.BASE
t
LZ.DQ
t
LZ.DQS
t
MOD
t
MRD
t
OIT
t
QH
t
QHS
24)25)
9)22)
9)22)
35)
35)
26)
27)