參數(shù)資料
型號: HD74HC149
廠商: Hitachi,Ltd.
英文描述: Dual 4-Input Positive-NAND Gates 14-CDIP -55 to 125
中文描述: 8到8線優(yōu)先編碼器
文件頁數(shù): 2/9頁
文件大小: 60K
代理商: HD74HC149
HD74HC149
2
Function Table
Inputs
Outputs
0
1
2
3
4
5
6
7
E
Y
0
H
Y
1
H
Y
2
H
Y
3
H
Y
4
H
Y
5
H
Y
6
H
Y
7
H
P
X
X
X
X
X
X
X
X
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
X
X
X
X
X
X
X
L
L
H
H
H
H
H
H
H
L
L
X
X
X
X
X
X
L
H
L
H
H
H
H
H
H
L
H
L
X
X
X
X
X
L
H
H
L
H
H
H
H
H
L
H
H
L
X
X
X
X
L
H
H
H
L
H
H
H
H
L
H
H
H
L
X
X
X
L
H
H
H
H
L
H
H
H
L
H
H
H
H
L
X
X
L
H
H
H
H
H
L
H
H
L
H
H
H
H
H
L
X
L
H
H
H
H
H
H
L
H
L
H
H
H
H
H
H
L
L
H :
L
X :
H
H
H
H
H
H
H
L
L
H
H
H
H
H
H
H
L
High level
Low level
Irrelevant
:
Pin Arrangement
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
E
GND
20
19
18
17
16
15
14
13
12
11
V
CC
Y
0
Y
1
Y
2
Y
3
Y
4
Y
5
Y
6
Y
7
P
(Top view)
Inputs
Outputs
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