Internet Data Sheet
HYB18TC256[80/16]0BF
256-Mbit Double-Data-Rate-Two SDRAM
7.2
Component AC Timing Parameters
List of Timing Parameters Tables.
TABLE 46
DRAM Component Timing Parameter by Speed Grade - DDR2–800
Parameter
Symbol
DDR2–800
Unit
Note1)2)3)4)5)6)7)
Min.
Max.
8)
DQ output access time from CK / CK
CAS to CAS command delay
Average clock high pulse width
Average clock period
tAC
–400
2
+400
—
ps
tCCD
nCK
tCK.AVG
ps
9)10)
9)10)
11)
tCH.AVG
tCK.AVG
0.48
2500
3
0.52
8000
—
CKE minimum pulse width ( high and low pulse tCKE
nCK
width)
9)10)
Average clock low pulse width
tCL.AVG
0.48
0.52
—
tCK.AVG
nCK
12)13)
Auto-Precharge write recovery + precharge time tDAL
WR + tnRP
Minimum time clocks remain ON after CKE
asynchronously drops LOW
tDELAY
tIS + tCK .AVG
tIH
+
—
ns
18)19)14)
8)
DQ and DM input hold time
tDH.BASE
tDIPW
tDQSCK
tDQSH
125
—
ps
DQ and DM input pulse width for each input
DQS output access time from CK / CK
DQS input high pulse width
0.35
–350
0.35
0.35
—
—
tCK.AVG
ps
+350
—
tCK.AVG
tCK.AVG
ps
DQS input low pulse width
tDQSL
—
15)
16)
DQS-DQ skew for DQS & associated DQ signals tDQSQ
200
+ 0.25
DQS latching rising transition to associated clock tDQSS
– 0.25
tCK.AVG
edges
17)18)19)
16)
DQ and DM input setup time
DQS falling edge hold time from CK
DQS falling edge to CK setup time
CK half pulse width
tDS.BASE
50
––
—
—
__
ps
tDSH
tDSS
tHP
0.2
0.2
tCK.AVG
tCK.AVG
ps
16)
20)
Min(tCH.ABS
,
tCL.ABS
)
8)21)
Data-out high-impedance time from CK / CK
Address and control input hold time
tHZ
—
tAC.MAX
—
ps
22)24)
tIH.BASE
250
0.6
ps
Control & address input pulse width for each input tIPW
—
tCK.AVG
ps
23)24)
8)21)
8)21)
34)
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
tIS.BASE
175
—
tLZ.DQ
tLZ.DQS
tMOD
tMRD
tOIT
2 x tAC.MIN
tAC.MAX
tAC.MAX
12
ps
tAC.MIN
ps
0
2
0
ns
—
nCK
ns
34)
25)
26)
12
DQ/DQS output hold time from DQS
DQ hold skew factor
tQH
t
HP – tQHS
—
ps
tQHS
—
300
ps
Rev. 1.3, 2007-05
37
07182006-DD60-22E6
QIMONDA [ QIMONDA AG ]
