參數(shù)資料
型號(hào): DP8441
文件頁(yè)數(shù): 30/46頁(yè)
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代理商: DP8441
11.0 AC Timing Parameters
(Continued)
Y
Symbol
Description
DP8440/41-40
40 MHz Devices
DP8440/41-25
25 MHz Devices
Min
Max
Min
Max
CLOCK PARAMETER
1
t
CLKP
Clock Period
25
40
2, 3
t
WCLK
Clock Pulse Width
10
15
4
t
DCLKP
DELCLK Period
25
25
5, 6
t
WDCLK
DELCLK Pulse Width
10
10
TRI-STATE PARAMETER
50
t
PZL
TRI-STATE to Low Voltage Level
20
25
51
t
PZH
TRI-STATE to High Voltage Level
20
25
52
t
PLZ
Low Voltage Level to TRI-STATE
25
30
53
t
PHZ
High Voltage Level to TRI-STATE
25
30
REFRESH PARAMETER
100
t
SRFCK
RFSH Asserted Set up to CLK High
6
8
101
t
HRFCK
RFSH Asserted Hold Time
3
4
102
t
SDRFCK
DISRFSH Asserted Setup to CLK High
6
8
103
t
HDRFCK
DISRFSH Asserted Hold Time
3
4
104
t
PCKRFL
CLK High to RFIP Asserted
17
20
105
t
PCKRFH
CLK High to RFIP Negated
34
36
106
t
PCKRQL
CLK High to RFRQ Asserted
13
15
107
t
PCKRQH
CLK High to RFRQ Negated
12
14
108
t
PCKRFRASL
CLK High to RAS Asserted During Refresh
23
25
109
t
PCKRFRASH
CLK High to RAS Negated During Refresh
19
21
PROGRAMMING PARAMETER
200
t
WML
ML Pulse Width
15
15
201
t
SPBML
Programming Bits Setup to ML High
18
18
202
t
HPBML
Programming Bits Hold Time
6
6
203
t
PMLRFL
ML High to RFIP Asserted
18
18
30
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