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Компоненты Описание
HD74HC490 Просмотр технического описания (PDF) - Hitachi -> Renesas Electronics
Номер в каталоге
Компоненты Описание
производитель
HD74HC490
Dual 4-bit Decade Counters
Hitachi -> Renesas Electronics
HD74HC490 Datasheet PDF : 8 Pages
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5
6
7
8
HD74HC490
BCD Count Sequence
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
Pin Arrangement
1Clock
1
1Clear 2
1Q
A
Output
3
1 Set-
to-9
4
1Q
B
5
1Q
C
6
1Q
D
7
GND 8
16 V
CC
CLR
Q
A
CK
Q
B
Q
C
15 2Clock
CLR
Q
A
CK
Q
B
14 2Clear
13
2Q
A
Output
12
2 Set-
to-9
11 2Q
B
Q
D
Q
C
10 2Q
C
Q
D
9 2Q
D
(Top view)
2
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