Internet Data Sheet
HYB18T512161BF–20/22/25/28/33
512-Mbit Double-Data-Rate-Two SDRAM
TABLE 30
Timing Parameter by Speed Grade
Parameter
Symbol –28
Min.
–33
Unit Note1)
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
–550
2
+550
—
–600
2
+600
—
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
tIS + tCK
tIH
+
––
tIS + tCK
tIH
+
––
ns
9)
DQ and DM input hold time (differential data
strobe)
tDH
275
25
––
––
295
45
––
––
ps
9)
DQ and DM input hold time (single ended data tDH1
ps
strobe)
DQ and DM input pulse width (each input)
DQS output access time from CK / CK
DQS input low (high) pulse width (write cycle)
tDIPW
0.35
–550
0.35
—
—
0.35
–600
0.35
—
—
tCK
9)
tDQSCK
tDQSL,H
tDQSQ
+550
—
+600
—
ps
tCK
10)
DQS-DQ skew (for DQS & associated DQ
signals)
450
450
ps
Write command to 1st DQS latching transition
tDQSS
tDS
WL – 0.25 WL + 0.25 WL – 0.25 WL + 0.25 tCK
9)
9)
DQ and DM input setup time (differential data
strobe)
150
––
170
––
ps
DQ and DM input setup time (single ended data tDS1
25
––
45
––
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)
12)
Clock half period
tHP
tHZ
tIH
MIN. (tCL, tCH
)
MIN. (tCL, tCH
)
Data-out high-impedance time from CK / CK
Address and control input hold time
—
tAC.MAX
—
—
tAC.MAX
—
ps
ps
tCK
625
0.6
675
0.6
Address and control input pulse width
(each input)
tIPW
—
—
Address and control input setup time
DQ low-impedance time from CK / CK
tIS
500
—
550
—
ps
ps
12)
12)
tLZ(DQ)
2 ×
tAC.MIN
tAC.MAX
2 ×
tAC.MIN
tAC.MAX
DQS low-impedance from CK / CK
Mode register set command cycle time
OCD drive mode output delay
Data output hold time from DQS
Data hold skew factor
tLZ(DQS)
tMRD
tOIT
tAC.MIN
tAC.MAX
—
tAC.MIN
tAC.MAX
—
ps
tCK
ns
—
ps
µs
µs
2
0
2
0
12
12
tQH
tHP–tQHS
—
t
HP–tQHS
—
tQHS
tREFI
—
—
—
600
7.8
3.9
—
—
—
600
7.8
3.9
13)14)
13)15)
Average periodic refresh Interval
Rev. 1.43, 2006-11
30
03292006-L40N-L04G
QIMONDA [ QIMONDA AG ]
