參數(shù)資料
型號: DS87C550-FNL
英文描述: EPROM High-Speed Micro with A/D and PWM
中文描述: 存儲器高速微與A / D及PWM
文件頁數(shù): 37/50頁
文件大?。?/td> 763K
代理商: DS87C550-FNL
DS87C550
37 of 50
TYPICAL I
CC
VERSUS FREQUENCY
AC ELECTRICAL CHARACTERISTICS
33 MHz
MIN
0
1
40
VARIABLE CLOCK
MIN
0
1
0.375 t
MCS
-5
PARAMETER
SYMBOL
MAX
33
33
MAX
33
33
UNITS
Oscillator Freq. (Ext. Osc.)
(Ext. Crystal)
1/t
CLCL
MHz
ALE Pulse Width
Port 0 Address Valid to ALE
Low
Address Hold after ALE Low
ALE Low to Valid
Instruction In
ALE Low to
PSEN
Low
PSEN
Pulse Width
PSEN
Low to Valid
Instruction In
Input Instruction Hold after
PSEN
Input Instruction Float after
PSEN
Port 0 Address to Valid
Instruction In
Port 2 Address to Valid
Instruction In
PSEN
Low to Address Float
t
LHLL
ns
t
AVLL
10
0.125 t
MCS
-5
ns
t
LLAX1
10
0.125 t
MCS
-5
ns
t
LLIV
56
0.625
t
MCS
-20
ns
t
LLPL
t
PLPH
10
55
0.125 t
MCS
-5
0.5 t
MCS
-5
ns
ns
t
PLIV
41
0.5t
MCS
-20
ns
t
PXIX
0
0
ns
t
PXIZ
26
0.25t
MCS
-5
0.75t
MCS
-20
0.875
t
MCS
-25
0
ns
t
AVIV
71
ns
t
AVIV2
81
ns
t
PLAZ
0
ns
NOTES FOR AC ELECTRICAL CHARACTERISTICS
§
The value for t
MCS
is a time period related to the machine cycle clock in terms of the processor’s input
clock frequency. Its value is highlighted in the table “STRETCH VALUE TIMING” for all possible
settings of the 4X/
2X
and CD1:0 bits. The default condition is CD1 = 1 and CD0 = 0, where 4X/
2X
is disregarded.
§
All parameters apply to both commercial and industrial temperature operation unless otherwise noted.
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