74LS390 Ver la hoja de datos (PDF) - Fairchild Semiconductor
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74LS390 Datasheet PDF : 6 Pages
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Function Tables
BCD Count Sequence
(Each Counter) (Note 1)
Outputs
Count
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
H = HIGH Level
L = LOW Level
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.
Logic Diagram
Bi-Quinary (5-2)
(Each Counter) (Note 2)
Outputs
Count
QA
QD
QC
QB
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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