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Номер в каталоге
Компоненты Описание
DM74LS390M Просмотр технического описания (PDF) - Fairchild Semiconductor
Номер в каталоге
Компоненты Описание
производитель
DM74LS390M
Dual 4-Bit Decade Counter
Fairchild Semiconductor
DM74LS390M Datasheet PDF : 6 Pages
1
2
3
4
5
6
Function Tables
BCD Count Sequence
(Each Counter) (Note 1)
Outputs
Count
Q
D
Q
C
Q
B
Q
A
0
L
L
L
L
1
L
L
L
H
2
L
L
H
L
3
L
L
H
H
4
L
H
L
L
5
L
H
L
H
6
L
H
H
L
7
L
H
H
H
8
H
L
L
L
9
H
L
L
H
H
=
HIGH Level
L
=
LOW Level
Note 1:
Output Q
A
is connected to input B for BCD count.
Note 2:
Output Q
D
is connected to input A for Bi-quinary count.
Logic Diagram
Bi-Quinary (5-2)
(Each Counter) (Note 2)
Outputs
Count
Q
A
Q
D
Q
C
Q
B
0
L
L
L
L
1
L
L
L
H
2
L
L
H
L
3
L
L
H
H
4
L
H
L
L
5
H
L
L
L
6
H
L
L
H
7
H
L
H
L
8
H
L
H
H
9
H
H
L
L
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2
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