DM74LS90CW データシートの表示（PDF） - Fairchild Semiconductor
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DM74LS90CW Datasheet PDF : 6 Pages
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Function Tables
BCD Count Sequence (Note 1)
Count
Output
QD
QC
QB
QA
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
Count
0
1
2
3
4
5
6
7
8
9
Bi-Quinary (5-2) (Note 2)
Output
QA
QD
QC
QB
L
L
L
L
L
L
L
H
L
L
H
L
L
L
H
H
L
H
L
L
H
L
L
L
H
L
L
H
H
L
H
L
H
L
H
H
H
H
L
L
H = HIGH Level
L = LOW Level
X = Don’t Care
Note 1: Output QA is connected to input B for BCD count.
Note 2: Output QD is connected to input A for bi-quinary count.
Note 3: Output QA is connected to input B.
Logic Diagram
The J and K inputs shown without connection are for reference only and
are functionally at a high level.
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