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參數(shù)資料
| 型號： | 74LS |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | Decade and Binary Counters |
| 中文描述： | 十年和二進(jìn)制計數(shù)器 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 146K |
| 代理商： | 74LS |
Function Tables
LS90
BCD Count Sequence
(See Note A)
Count
Output
Q
D
Q
C
Q
B
Q
A
0
1
2
3
4
5
6
7
8
9
L
L
L
L
L
L
L
L
H
H
L
L
L
L
H
H
H
H
L
L
L
L
H
H
L
L
H
H
L
L
L
H
L
H
L
H
L
H
L
H
LS90
Bi-Quinary (5-2)
(See Note B)
Count
Output
Q
A
Q
D
Q
C
Q
B
0
1
2
3
4
5
6
7
8
9
L
L
L
L
L
H
H
H
H
H
L
L
L
L
H
L
L
L
L
H
L
L
H
H
L
L
L
H
H
L
L
H
L
H
L
L
H
L
H
L
LS93
Count Sequence
(See Note C)
Count
Output
Q
D
Q
C
Q
B
Q
A
0
1
2
3
4
5
6
7
8
9
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
10
11
12
13
14
15
Note A:
Output Q
A
is connected to input B for BCD count.
Note B:
Output Q
D
is connected to input A for bi-quinary count.
Note C:
Output Q
A
is connected to input B.
Note D:
H
e
High Level, L
e
Low Level, X
e
Don’t Care.
LS90
Reset/Count Truth Table
Reset Inputs
Output
R0(1)
R0(2)
R9(1)
R9(2)
Q
D
Q
C
Q
B
Q
A
H
H
X
X
L
L
X
H
H
X
L
X
X
L
L
X
H
X
L
X
L
X
L
H
L
X
L
X
L
L
H
L
L
L
COUNT
COUNT
COUNT
COUNT
L
L
L
L
L
H
LS93
Reset/Count Truth Table
Reset Inputs
Output
R0(1)
R0(2)
Q
D
Q
C
Q
B
Q
A
H
L
X
H
X
L
L
L
L
L
COUNT
COUNT
6
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