74LS90 datasheet(2/6 Pages) FAIRCHILD | Decade and Binary Counters

Nombre de pieza

Descripción

74LS90

Decade and Binary Counters ( 6 Page)

FAIRCHILD

2 page

www.fairchildsemi.com

Function Tables

BCD Count Sequence (Note 1)

Bi-Quinary (5-2) (Note 2)

= HIGH Level

= LOW Level

= 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

LLL

HHH

LLL

Count

Output

LLL

1 2 3 4 5 6

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