參數(shù)資料
型號(hào): HD74AC
廠商: Hitachi,Ltd.
英文描述: HD74AC Series Common Information
中文描述: HD74AC系列通用信息
文件頁(yè)數(shù): 12/52頁(yè)
文件大?。?/td> 220K
代理商: HD74AC
FACT Descriptions and Family Characteristics
11
V
CC
SET
CLR
D
CLK
Q
Q
’74
SET
CLR
D
CLK
Q
Q
’74
SET
CLR
D
CLK
Q
Q
’74
SET
CLR
D
CLK
Q
Q
’74
E1
E2
E3
A0
A1
A2
01
02
03
04
05
06
07
08
Input
’04 Load Devices
’138
Figure 9 Power Demonstration Circuit Schematic
3. The power supply current is measure and recorded at input frequencies of 200 kHz and 1 MHz.
4. The power dissipation capacitance is calculated by solving the two simultaneous equations
P
1
= (C
PD
V
CC
2
f
1
) + (I
CC
V
CC
)
P
2
= (C
PD
V
CC
2
f
2
) + (I
CC
V
CC
)
giving
C
PD
= (P
1
– P
2
)/V
CC
2
(f
1
– f
2
)
or
C
PD
= (I
1
– I
2
)/V
CC
(f
1
– f
2
)
where
I
1
= supply current at f
1
= 200 kHz.
I
2
= supply current at f
2
= 1 MHz
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