74LS90 datasheet(6/10 Pages) NSC | Decade and Binary Counters

6 page

Function Tables

LS90

BCD Count Sequence

(See Note A)

Count

Output

LS90

Bi-Quinary (5-2)

(See Note B)

Count

Output

LLL

LHL

HLH

LS93

Count Sequence

(See Note C)

Count

Output

Note A

Output QA is connected to input B for BCD count

Note B

Output QD is connected to input A for bi-quinary count

Note C

Output QA is connected to input B

Note D

H e High Level L e Low Level X e Don’t Care

LS90

ResetCount Truth Table

Reset Inputs

Output

R0(1)

R0(2)

R9(1)

R9(2)

COUNT

LS93

ResetCount Truth Table

Reset Inputs

Output

R0(1)

R0(2)

COUNT

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