2
函数的 图解
Pinouts
CD54HC540
(cerdip)
cd74hc540, cd74hct540
(pdip, soic)
顶 视图
cd54hc541, cd54hct541
(cerdip)
CD74HC541
(pdip, soic, tssop)
CD74HCT541
(pdip, soic)
顶 视图
11
12
13
14
15
16
17
18
20
19
10
9
8
7
6
5
4
3
2
1
OE
A0
A1
A2
A3
A4
A6
A5
A7
地
V
CC
Y0
Y1
Y2
OE2
Y3
Y4
Y5
Y6
Y7
11
12
13
14
15
16
17
18
20
19
10
9
8
7
6
5
4
3
2
1
OE1
A0
A1
A2
A3
A4
A6
A5
A7
地
V
CC
Y0
Y1
Y2
OE2
Y3
Y4
Y5
Y6
Y7
D
0
Y
0
D
2
D
4
D
6
Y
2
Y
4
Y
6
D
1
D
3
D
5
D
7
Y
1
Y
3
Y
5
Y
7
OE
一个
OE
B
540 541
Y
0
Y
2
Y
4
Y
6
Y
1
Y
3
Y
5
Y
7
cd54/74hc540, cd74hct540, cd54/74hc541, cd54/74hct541cd54/74hc540, cd74hct540, cd54/74hc541, cd54/74hct541