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HD74HC490 Datasheet(PDF) 2 Page - Hitachi Semiconductor

Part No. HD74HC490
Description  Dual 4-bit Decade Counters
Download  8 Pages
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Manufacturer  HITACHI [Hitachi Semiconductor]
Direct Link  http://www.renesas.com/eng
Logo HITACHI - Hitachi Semiconductor

HD74HC490 Datasheet(HTML) 2 Page - Hitachi Semiconductor

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HD74HC490
2
BCD Count Sequence
Outputs
Count
Q
D
Q
C
Q
B
Q
A
0L
L
L
L
1L
L
L
H
2L
L
H
L
3L
L
H
H
4L
H
L
L
5L
H
L
H
6L
H
H
L
7L
H
H
H
8H
L
L
L
9H
L
L
H
Pin Arrangement
CLR
CLR
QA
QA
QB
QC
QD
QB
QC
QD
CK
CK
(Top view)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1 Set-
to-9
1QB
1QC
1QD
GND
1Clock
1Clear
1QA
Output
VCC
2Clock
2 Set-
to-9
2QB
2QC
2QD
2Clear
2QA
Output


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