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HYB18TC256160AF_1 Datasheet, PDF (43/55 Pages) Qimonda AG – 256-Mbit Double-Data-Rate-Two SDRAM DDR2 SDRAM
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Internet Data Sheet
HYB18TC256160AF
256-Mbit Double-Data-Rate-Two SDRAM
Parameter
Symbol
DQS falling edge hold time from CK (write
tDSH
cycle)
DQS falling edge to CK setup time (write cycle) tDSS
Clock half period
tHP
Data-out high-impedance time from CK / CK tHZ
Address and control input hold time
tIH(base)
Address and control input pulse width
tIPW
(each input)
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
Data output hold time from DQS
Data hold skew factor
Average periodic refresh Interval
Average periodic refresh Interval
Auto-Refresh to Active/Auto-Refresh
command period
tIS(base)
tLZ(DQ)
tLZ(DQS)
tMRD
tOIT
tQH
tQHS
tREFI
tREFI
tRFC
Precharge-All (4 banks) command period
Read preamble
Read postamble
Active bank A to Active bank B command
period
tRP
tRPRE
tRPST
tRRD
Active bank A to Active bank B command
tRRD
period
Internal Read to Precharge command delay
Write preamble
Write postamble
Write recovery time for write without Auto-
Precharge
tRTP
tWPRE
tWPST
tWR
Internal Write to Read command delay
Exit power down to any valid command
(other than NOP or Deselect)
tWTR
tXARD
Exit active power-down mode to Read
command (slow exit, lower power)
tXARDS
Exit precharge power-down to any valid
tXP
command (other than NOP or Deselect)
Exit Self-Refresh to non-Read command
Exit Self-Refresh to Read command
Write recovery time for write with Auto-
Precharge
tXSNR
tXSRD
WR
DDR2–400
Min.
0.2
0.2
MIN. (tCL, tCH)
—
475
0.6
350
2 × tAC.MIN
tAC.MIN
2
0
tHP –tQHS
—
—
—
75
tRP
0.9
0.40
7.5
10
7.5
0.25
0.40
15
10
2
6 – AL
2
tRFC +10
200
tWR/tCK
Rev. 1.20, 2007-04
43
03062006-H3V1-XJT4
Max.
—
—
tAC.MAX
—
—
—
tAC.MAX
tAC.MAX
—
12
—
450
7.8
3.9
—
—
1.1
0.60
—
—
—
—
0.60
—
—
—
—
—
—
—
Unit
Notes1)2)3)4)5)
6)
tCK
tCK
11)
ps
12)
ps
11)
tCK
ps
11)
ps
14)
ps
14)
tCK
ns
ps
µs
13)14)
µs
15)18)
ns
16)
ns
tCK
14)
tCK
14)
ns
14)17)
ns
16)22)
ns
tCK
tCK
18)
ns
ns
19)
tCK
20)
tCK
21)
tCK
ns
tCK
tCK
21)
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