Rainbow Electronics W9864G2GH User Manual
Page 18
W9864G2GH
- 18 -
t
CL
is the pulse width of CLK measured from the negative edge to the positive edge referenced to V
IL
(max.).
(2) A.C Latency Characteristics
CKE to clock disable (CKE Latency)
1
tCK
DQM to output to HI-Z (Read DQM Latency)
2
DQM to output to HI-Z (Write DQM Latency)
0
Write command to input data (Write Data Latency)
0
CS
to Command input (
CS
Latency)
0
CL = 2
2
Precharge to DQ Hi-Z Lead time
CL = 3
3
CL = 2
1
Precharge to Last Valid data out
CL = 3
2
CL = 2
2
Bust Stop Command to DQ Hi-Z Lead time
CL = 3
3
CL = 2
1
Bust Stop Command to Last Valid Data out
CL = 3
2
CL = 2
BL + tRP
tCK + nS
Read with Auto-precharge Command to Active/Ref
Command
CL = 3
BL + tRP
CL = 2
(BL+1)+ tRP
Write with Auto-precharge Command to Active/Ref Command
CL = 3
(BL+1)+ tRP
7.
Assumed input rise and fall time (tr & tf) = 1ns.
If tr & tf is longer than 1ns, transient time compensation should be considered,
i.e., [(tr + tf)/2-1]ns should be added to the parameter.
( The tT maximum can’t be more than 10nS for low frequency application. )