參數(shù)資料
型號: W986432EH-7
廠商: WINBOND ELECTRONICS CORP
元件分類: DRAM
英文描述: 2M X 32 SYNCHRONOUS DRAM, 5.5 ns, PDSO86
封裝: 0.400 INCH, TSOP2-86
文件頁數(shù): 10/48頁
文件大?。?/td> 1180K
代理商: W986432EH-7
W986432EH / W9864G2EH
- 18 -
1. Transition times are measured between VIH and VIL.
2. tHZ defines the time at which the outputs achieve the open circuit condition and is not
referenced to output level.
3. These parameters account for the number of clock cycles and depend on the operating
frequency of the clock, as follows the number of clock cycles = specified value of timing/
clock period (count fractions as whole number)
(1) tCH is the pulse width of CLK measured from the positive edge to the negative edge
referenced to VIH (min.).
tCL is the pulse width of CLK measured from the negative edge to the positive edge
referenced to VIL (max.).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
Precharge to DQ Hi-Z Lead time
CL = 2
2
CL = 3
3
Precharge to Last Valid data out
CL = 2
1
CL = 3
2
Bust Stop Command to DQ Hi-Z Lead time
CL = 2
2
CL = 3
3
Bust Stop Command to Last Valid Data out
CL = 2
1
CL = 3
2
Read with Auto-precharge Command to Active/Ref
Command
CL = 2
BL + tRP
tCK + nS
CL = 3
BL + tRP
Write with Auto-precharge Command to Active/Ref
Command
CL = 2
(BL+1) + tRP
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. )
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