Internet Data Sheet
HYS[64/72]T[32/64/128]xx0HU–[3/3S/3.7/5]–A
Unbuffered DDR2 SDRAM Modules
TABLE 19
Timing Parameter by Speed Grade - DDR2-400
Parameter
Symbol
DDR2–400
Unit
Notes1)2)3)4)5)
6)7)
Min.
Max.
DQ output access time from CK / CK
CAS A to CAS B command period
CK, CK high-level width
tAC
–600
2
+600
—
ps
tCCD
tCH
tCKE
tCL
tCK
tCK
tCK
tCK
tCK
0.45
3
0.55
—
CKE minimum high and low pulse width
CK, CK low-level width
0.45
WR + tRP
0.55
—
8)22)
9)
Auto-Precharge write recovery + precharge
time
tDAL
Minimum time clocks remain ON after CKE
asynchronously drops LOW
tDELAY
tIS + tCK + tIH
275
––
––
—
ns
ps
ps
10)
11)
DQ and DM input hold time (differential data
strobe)
t
t
DH(base)
DQ and DM input hold time (single ended data
strobe)
DH1(base)
–25
DQ and DM input pulse width (each input)
DQS output access time from CK / CK
tDIPW
0.35
–500
0.35
—
—
tCK
ps
tCK
ps
tDQSCK
+500
—
DQS input low (high) pulse width (write cycle) tDQSL,H
11)
DQS-DQ skew (for DQS & associated DQ
signals)
tDQSQ
350
Write command to 1st DQS latching transition tDQSS
– 0.25
150
+ 0.25
—
tCK
11)
11)
DQ and DM input setup time (differential data
strobe)
t
DS(base)
ps
DQ and DM input setup time (single ended
data strobe)
t
DS1(base)
–25
0.2
—
—
ps
DQS falling edge hold time from CK (write
cycle)
tDSH
tCK
DQS falling edge to CK setup time (write cycle) tDSS
0.2
—
—
—
tCK
ns
ns
Four Activate Window period
tFAW
37.5
13)
12)
13)
11)
50
Clock half period
tHP
MIN. (tCL, tCH)
Data-out high-impedance time from CK / CK
Address and control input hold time
tHZ
—
tAC.MAX
—
ps
ps
tCK
tIH(base)
tIPW
475
0.6
Address and control input pulse width
(each input)
—
11)
14)
14)
Address and control input setup time
DQ low-impedance time from CK / CK
DQS low-impedance from CK / CK
Mode register set command cycle time
OCD drive mode output delay
tIS(base)
tLZ(DQ)
tLZ(DQS)
tMRD
350
—
ps
ps
ps
tCK
ns
2 × tAC.MIN
tAC.MAX
tAC.MAX
—
tAC.MIN
2
0
tOIT
12
Data output hold time from DQS
tQH
t
HP –tQHS
—
Rev. 1.41, 2007-05
28
03292006-EZUJ-JY4S
QIMONDA [ QIMONDA AG ]
