–0.4
0.4
—
0.225
0
0.225
t
HP
–
t
QHS
HYB18T256324F–[16/20/22]
256-Mbit DDR SGRAM
Electrical Characteristics
Data Sheet
76
Rev. 1.11, 04-2005
10292004-DOXT-FS0U
Data-in and Data Mask to WDQS
Hold Time
Data-in and DM input pulse width
(each input)
DQS input low pulse width
DQS input high pulse width
DQS Write Preamble Time
DQS Write Postamble Time
Write Recovery Time
Read Cycle Timing Parameters for Data and Data Strobe
Data Access Time from Clock
Read Preamble
Read Postamble
Data-out high impedance time from
CLK
Data-out low impedance time from
CLK
DQS edge to Clock edge skew
DQS edge to output data edge skew
t
DQSQ
Data hold skew factor
Data output hold time from DQS
Refresh/Power Down Timing
Refresh Period (4096 cycles)
Average periodic Auto Refresh
interval
Delay from AREF to next ACT/
AREF
Self Refresh Exit time
Precharge Power Down Exit time
Active Power Down Exit time
Other Timing Parameters
RES to CKE setup timing
RES to CKE hold timing
Termination update Keep Out
timing
Rev. ID EMRS to DQ on timing
Rev. ID EMRS to DQ off timing
t
DH
0.35
—
0.375
—
0.375
—
ns
t
DIPW
0.45
—
0.45
—
0.45
—
t
CK
t
DQSL
t
DQSH
t
WPRE
t
WPST
t
WR
0.45
0.45
0.75
0.75
11.0
—
—
1.25
1.25
—
0.45
0.45
0.75
0.75
11.0
—
—
1.25
1.25
—
0.45
0.45
0.75
0.75
11.0
—
—
1.25
1.25
—
t
CK
t
CK
t
CK
t
CK
ns
3
t
AC
t
RPRE
t
RPST
t
HZ
–0.4
0.75
0.75
t
ACmin
0.4
1.25
1.25
t
ACmax
–0.4
0.75
0.75
t
ACmin
0.4
1.25
1.25
t
ACmax
–0.45
0.75
0.75
t
ACmin
0.45
1.25
1.25
t
ACmax
ns
t
CK
t
CK
ns
t
LZ
t
ACmin
t
ACmax
t
ACmin
t
ACmax
t
ACmin
t
ACmax
ns
t
DQSCK
–0.4
—
0
t
HP
–
t
QHS
0.4
0.225
0.225
–0.45
—
0
t
HP
–
t
QHS
0.45
0.25
0.25
ns
ns
ns
ns
t
QHS
t
QH
t
REF
t
REFI
—
7.8
32
—
7.8
32
—
7.8
32
ms
μs
t
RFC
54
—
54
—
54
—
ns
t
XSC
t
XPN
t
XARD
200
5
8
—
—
—
200
4
6
—
—
—
200
4
6
—
—
—
t
CK
t
CK
t
CK
t
ATS
t
ATH
t
KO
10
10
10
—
—
—
10
10
10
—
—
—
10
10
10
—
—
—
ns
ns
ns
t
RIDon
t
RIDoff
—
—
20
20
—
—
20
20
—
—
20
20
ns
ns
1)
t
HP
is the lesser of t
CL
minimum and t
CH
minimum actually applied to the device CLK, CLK inputs
2)
t
CCD
is either for gapless consecutive reads or gapless consecutive writes.
3)
t
WTR
and t
WR
start at the first rising edge of CLK after the last valid (falling) WDQS edge of the slowest WDQS signal
.
4)
Please round up
t
RTW
to the next integer of
t
CK
.
Table 43
Parameter
Timing Parameters for –1.6, –2.0 and –2.2 speed sorts
Read
latency
bol
Sym-
Limit Values
–1.6
min
Unit
Notes
–2.0
max
–2.2
max
max
min
min