七段数码管译码器驱动器74LS48引脚图及译码表
七段数码管译码器驱动器74LS48引脚图及译码表

74ls48引脚图
74ls48引脚功能表—七段译码驱动器功能表
十进数
或功能
输入
BI/RBO
输出
备注
LT
RBI
D C B A
a
b
c
d
e
f
g
0
H
H
0 0 0 0
H
1
1
1
1
1
1
0
1
1
H
x
0 0 0 1
H
0
1
1
0
0
0
0
2
H
x
0 0 1 0
H
1
1
0
1
1
0
1
3
H
x
0 0 1 1
H
1
1
1
1
0
0
1
4
H
x
0 1 0 0
H
0
1
1
0
0
1
1
5
H
x
0 1 0 1
H
1
0
1
1
0
1
1
6
H
x
0 1 1 0
H
0
0
1
1
1
1
1
7
H
x
0 1 1 1
H
1
1
1
0
0
0
0
8
H
x
1 0 0 0
H
1
1
1
1
1
1
1
9
H
x
1 0 0 1
H
1
1
1
0
0
1
1
10
H
x
1 0 1 0
H
0
0
0
1
1
0
1
11
H
x
1 0 1 1
H
0
0
1
1
0
0
1
12
H
x
1 1 0 0
H
0
1
0
0
0
1
1
13
H
x
1 1 0 1
H
1
0
0
1
0
1
1
14
H
x
1 1 1 0
H
0
0
0
1
1
1
1
15
H
x
1 1 1 1
H
0
0
0
0
0
0
0
BI
x
x
x x x x
L
0
0
0
0
0
0
0
2
RBI
H
L
0 0 0 0
L
0
0
0
0
0
0
0
3
LT
L
x
x x x x
H
1
1
1
1
1
1
1
4
应用电路
