Internet Data Sheet
HYB18T1G[40/80/16]0C4F
1-Gbit Double-Data-Rate-Two SDRAM
Parameter
Symbol DDR2–800
Min.
DDR2–667
Min.
Unit
Note1)2)3
)4)5)6)7)
Max.
Max.
8)21)
8)21)
DQ low impedance time from CK/CK tLZ.DQ
2 × tAC.MIN
tAC.MAX
tAC.MAX
2 × tAC.MIN
tAC.MAX
tAC.MAX
ps
ps
DQS/DQS low-impedance time from tLZ.DQS
tAC.MIN
tAC.MIN
CK / CK
34)
MRS command to ODT update delay tMOD
0
2
12
—
0
2
12
—
ns
Mode register set command cycle
time
tMRD
nCK
34)
OCD drive mode output delay
tOIT
0
12
0
12
ns
ps
ps
μs
μs
ns
25)
DQ/DQS output hold time from DQS tQH
tHP – tQHS
—
t
HP – tQHS
—
26)
DQ hold skew factor
tQHS
tREFI
—
300
7.8
3.9
—
—
340
7.8
3.9
—
27)28)
27)29)
30)
Average periodic refresh Interval
—
—
—
—
Auto-Refresh to Active/Auto-Refresh tRFC
127.5
127.5
command period
31)32)
31)33)
34)
Read preamble
Read postamble
tRPRE
tRPST
0.9
0.4
7.5
1.1
0.6
—
0.9
0.4
7.5
1.1
0.6
—
tCK.AVG
tCK.AVG
ns
Active to active command period for tRRD
1KB page size products
34)
34)
Active to active command period for tRRD
2KB page size products
10
—
—
10
—
—
ns
ns
Internal Read to Precharge command tRTP
7.5
7.5
delay
Write preamble
tWPRE
tWPST
tWR
0.35
0.4
15
—
0.6
—
—
—
0.35
0.4
15
—
0.6
—
—
—
tCK.AVG
tCK.AVG
ns
Write postamble
Write recovery time
34)
34)35)
Internal write to read command delay tWTR
7.5
2
7.5
2
ns
Exit active power down to read
command
tXARD
tXARDS
tXP
nCK
Exit active power down to read
command (slow exit, lower power)
8 – AL
2
—
—
—
—
7 – AL
2
—
—
—
—
nCK
nCK
ns
Exit precharge power-down to any
command
34)
Exit self-refresh to a non-read
command
tXSNR
tRFC +10
tRFC +10
Exit self-refresh to read command
tXSRD
200
200
nCK
nCK
Write command to DQS associated
clock edges
WL
RL – 1
RL–1
1) VDDQ = 1.8 V ± 0.1V; VDD = 1.8 V ± 0.1 V.
2) Timing that is not specified is illegal and after such an event, in order to guarantee proper operation, the DRAM must be powered down
and then restarted through the specified initialization sequence before normal operation can continue.
3) Timings are guaranteed with CK/CK differential Slew Rate of 2.0 V/ns. For DQS signals timings are guaranteed with a differential Slew
Rate of 2.0 V/ns in differential strobe mode and a Slew Rate of 1 V/ns in single ended mode.
Rev. 1.01, 2008-11
42
04212008-66HT-ZLFE
QIMONDA [ QIMONDA AG ]
