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W9751G6IB
9.11 AC Characteristics
9 .11.1 A C Characteristics and Operating Condition fo r 25F speed grade
SPEED GRADE
DDR2-800 (25F)
SYM.
Bin(CL-t RCD -t RP)
PARAMETER
MIN.
5-5-5
MAX.
UNIT 25
NOTES
t RCD
t RP
t RC
t RAS
t RFC
Active to Read/Write Command Delay Time
Precharge to Active Command Period
Active to Ref/Active Command Period
Active to Precharge Command Period
Auto Refresh to Active/Auto Refresh command period
12.5
12.5
52.5
40
105
?
?
?
70000
?
nS
nS
nS
nS
nS
23
23
23
4,23
5
t REFI
Average periodic
refresh Interval
0 ° C ≦ T CASE ≦ 85 ° C
85 ° C < T CASE ≦ 95 ° C
?
?
7.8
3.9
μ S
μ S
5
5,6
t CCD
CAS to CAS command delay
2
?
n CK
t CK(avg) @ CL=3
5
8
nS
30,31
t CK(avg)
Average clock period
t CK(avg) @ CL=4
t CK(avg) @ CL=5
t CK(avg) @ CL=6
3.75
2.5
2.5
8
8
8
nS
nS
nS
30,31
30,31
30,31
t CH(avg)
t CL(avg)
t AC
t DQSCK
t DQSQ
t CKE
t RRD
t FAW
t WR
t DAL
t WTR
t RTP
t IS(base)
t IH(base)
t IS(ref)
t IH(ref)
t IPW
t DQSS
t DSS
t DSH
t DQSH
t DQSL
Average clock high pulse width
Average clock low pulse width
DQ output access time from CLK/ CLK
DQS output access time from CLK / CLK
DQS-DQ skew for DQS & associated DQ signals
CKE minimum high and low pulse width
Active to active command period for 2KB page size
Four Activate Window for 2KB page size
Write recovery time
Auto-precharge write recovery + precharge time
Internal Write to Read command delay
Internal Read to Precharge command delay
Address and control input setup time
Address and control input hold time
Address and control input setup time
Address and control input hold time
Address and control input pulse width for each input
DQS latching rising transitions to associated clock edges
DQS falling edge to CLK setup time
DQS falling edge hold time from CLK
DQS input high pulse width
DQS input low pulse width
0.48
0.48
-400
-350
?
3
10
45
15
WR + tn RP
7.5
7.5
175
250
375
375
0.6
-0.25
0.2
0.2
0.35
0.35
0.52
0.52
400
350
200
?
?
?
?
?
?
?
?
?
?
?
0.25
?
?
?
?
t CK(avg)
t CK(avg)
pS
pS
pS
n CK
nS
nS
nS
n CK
nS
nS
pS
pS
pS
pS
t CK(avg)
t CK(avg)
t CK(avg)
t CK(avg)
t CK(avg)
t CK(avg)
30,31
30,31
35
35
13
7
8,23
23
23
24
9,23
4,23
10,26,
40,42,43
11,26,
40,42,43
10,26,
40,42,43
11,26,
40,42,43
28
28
28
Publication Release Date: Oct. 23, 2009
- 43 -
Revision A06
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