參數(shù)資料
型號(hào): 7493
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(jì)數(shù)器
文件頁(yè)數(shù): 6/10頁(yè)
文件大?。?/td> 133K
代理商: 7493
Function Tables
(Note D)
90A
BCD Count Sequence
(See Note A)
Count
Outputs
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
90A
BCD Bi-Quinary (5-2)
(See Note B)
Count
Outputs
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
93A
Count Sequence
(See Note C)
Count
Outputs
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
90A
Reset/Count Function Table
Reset Inputs
Outputs
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
93A
Reset/Count Function Table
Reset Inputs
Outputs
R0(1)
R0(2)
Q
D
Q
C
Q
B
Q
A
H
L
X
H
X
L
L
L
L
L
COUNT
COUNT
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.
6
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