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DM74LS90M Scheda tecnica(PDF) 2 Page - Fairchild Semiconductor

Il numero della parte DM74LS90M
Spiegazioni elettronici  Decade and Binary Counters
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Produttore elettronici  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

DM74LS90M Scheda tecnica(HTML) 2 Page - Fairchild Semiconductor

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Function Tables
BCD Count Sequence (Note 1)
Bi-Quinary (5-2) (Note 2)
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.
Count
Output
QD
QC
QB
QA
0
L
LLL
1L
L
L
H
2L
L
H
L
3L
L
H
H
4L
H
L
L
5L
H
L
H
6L
H
H
L
7
L
HHH
8
H
LLL
9H
L
L
H
Count
Output
QA
QD
QC
QB
0
L
LLL
1L
L
L
H
2L
L
H
L
3L
L
H
H
4L
H
L
L
5
H
LLL
6H
L
L
H
7H
L
H
L
8H
L
H
H
9H
H
L
L


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