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W9425G6EH
9.6
AC Characteristics and Operating Condition
SYM.
PARAMETER
MIN.
-4
MAX.
-5/-5I
MIN. MAX.
-6/-6I
MIN. MAX.
UNIT
NOTES
t RC
t RFC
Active to Ref/Active Command Period
Ref to Ref/Active Command Period
52
60
55
70
60
72
t RAS
Active to Precharge Command Period
36
70000
40
70000
42
100000
nS
t RCD
t RAP
Active to Read/Write Command Delay Time
Active to Read with Auto-precharge Enable
16
16
15
15
18
15
t CCD
t RP
t RRD
t WR
Read/Write(a) to Read/Write(b) Command
Period
Precharge to Active Command Period
Active(a) to Active(b) Command Period
Write Recovery Time
1
16
8
15
1
15
10
15
1
18
12
15
t CK
nS
t DAL
Auto-precharge Write Recovery + Precharge
Time
-
-
-
t CK
18
CL = 2
-
-
7.5
12
7.5
12
t CK
CLK Cycle Time
CL = 2.5
CL = 3
CL = 4
-
4
4
-
10
10
6
5
-
12
12
-
6
6
-
12
12
-
nS
t AC
t DQSCK
Data Access Time from CLK, CLK
DQS Output Access Time from CLK, CLK
-0.7
-0.6
-0.7
0.6
-0.7
-0.6
0.7
0.6
-0.7
-0.6
0.7
0.6
16
t DQSQ
Data Strobe Edge to Output Data Edge Skew
0.4
0.4
0.45
t CH
t CL
CLk High Level Width
CLK Low Level Width
0.45
0.45
0.55
0.55
0.45
0.45
0.55
0.55
0.45
0.45
0.55
0.55
t CK
11
t HP
t QH
CLK Half Period (minimum of actual t CH, t CL )
DQ Output Data Hold Time from DQS
min
(t CL ,t CH )
t HP
-0.5
min,
(t CL ,t CH )
t HP
-0.5
min,
(t CL ,t CH )
t HP
-0.5
nS
t RPRE
t RPST
DQS Read Preamble Time
DQS Read Postamble Time
0.9
0.4
1.1
0.6
0.9
0.4
1.1
0.6
0.9
0.4
1.1
0.6
t CK
11
t DS
DQ and DM Setup Time
0.4
0.4
0.45
t DH
t DIPW
t DQSH
DQ and DM Hold Time
DQ and DM Input Pulse Width (for each input)
DQS Input High Pulse Width
0.4
1.75
0.35
0.4
1.75
0.35
0.45
1.75
0.35
nS
t DQSL
t DSS
t DSH
t WPRES
DQS Input Low Pulse Width
DQS Falling Edge to CLK Setup Time
DQS Falling Edge Hold Time from CLK
Clock to DQS Write Preamble Set-up Time
0.35
0.2
0.2
0
0.35
0.2
0.2
0
0.35
0.2
0.2
0
t CK
nS
11
Publication Release Date:Dec. 03, 2008
- 27 -
Revision A08
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