Internet Data Sheet
HYB18T512161B2F–20/25
512-Mbit Double-Data-Rate-Two SDRAM
5.7.2
AC Timing Parameters
List of Timing Parameters
TABLE 29
Timing Parameter by Speed Grade
Parameter
Symbol –20
Min.
–25
Unit Notes1)
2)3)4)5)6)
Max.
Min.
Max.
DQ output access time from CK / CK
CAS A to CAS B command period
CK, CK high-level width
tAC
–450
2
+450
—
–500
2
+500
—
ps
tCCD
tCH
tCKE
tCL
tCK
tCK
tCK
tCK
0.45
3
0.55
—
0.45
3
0.55
—
CKE minimum high and low pulse width
CK, CK low-level width
0.45
WR + tRP
0.55
—
0.45
WR + tRP
0.55
—
7)18)
Auto-Precharge write recovery + precharge
time
tDAL
tCK
8)
Minimum time clocks remain ON after CKE
asynchronously drops LOW
tDELAY
tDH
tIS + tCK + tIH ––
tIS + tCK + tIH ––
ns
9)
DQ and DM input hold time (differential data
strobe)
145
––
––
250
0
––
––
ps
9)
DQ and DM input hold time (single ended data tDH1
-105
ps
strobe)
DQ and DM input pulse width (each input)
DQS output access time from CK / CK
tDIPW
0.35
–450
0.35
—
—
0.35
–500
0.35
—
—
tCK
9)
tDQSCK
+450
—
+500
—
ps
DQS input low (high) pulse width (write cycle) tDQSL,H
tCK
10)
DQS-DQ skew (for DQS & associated DQ
signals)
tDQSQ
280
280
ps
Write command to 1st DQS latching transition tDQSS
WL – 0.25
20
WL +
0.25
WL – 0.25
WL +
0.25
tCK
9)
DQ and DM input setup time (differential data tDS
strobe)
125
0
––
ps
9)
DQ and DM input setup time (single ended data tDS1
-105
––
ps
strobe)
DQS falling edge hold time from CK (write cycle) tDSH
DQS falling edge to CK setup time (write cycle) tDSS
0.2
0.2
—
—
0.2
0.2
—
—
tCK
tCK
11)
Clock half period
tHP
tHZ
tIH
MIN. (tCL,
—
t
CH) —
MIN. (tCL,
—
t
CH) —
tAC.MAX ps
12)
Data-out high-impedance time from CK / CK
Address and control input hold time
tAC.MAX
525
575
—
—
ps
Address and control input pulse width
(each input)
tIPW
0.6
—
0.6
tCK
Address and control input setup time
DQ low-impedance time from CK / CK
tIS
400
450
—
ps
12)
12)
tLZ(DQ)
2 ×
tAC.MIN
tAC.MAX
2 ×
tAC.MIN
tAC.MAX ps
DQS low-impedance from CK / CK
tLZ(DQS)
tMRD
tAC.MIN
tAC.MAX tAC.MIN
tAC.MAX ps
— tCK
Mode register set command cycle time
2
—
2
Rev. 1.1, 2007-06
26
05152007-ZYAH-ACMZ
Date: 2008-02-26
QIMONDA [ QIMONDA AG ]
