variáveis lógicas
Autor: Bia Kitty | Publicado: 2015-12-11T11:12:00-02:00

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A representação
é feita pela álgebra de Booleana que expressa a operação de um circuito na
forma de uma operação Algébrica; na álgebra Booleana, as constantes e variáveis
podem ter apenas 2 valores: 0 ou 1 (níveis lógicos). 

As variáveis
lógicas assumem estados distintos, e podem representar situações da vida real.






 
 
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 

 


A álgebra booleana tem apenas três &nbsp;operações básicas: AND (E), OR (OU), NOT 

(NÃO)

Tabela verdade 

• Técnica para determinar como a saída &nbsp;lógica de um circuito depende dos níveis lógicos
presentes nas entradas do circuito.







 


A operação OR (OU) 

• Representada algebricamente como: &nbsp;S=A+B (leia-se A OU B)






 


A operação OR (OU) – Aplicação 

• Ativação de um alarme caso um sensor seja ativado






 


A operação AND (E) 

• Representada algebricamente como: &nbsp;S=A.B (leia-se A e B)






 


A operação AND (E) – Exemplos 

• Diagramas de tempo:


 




• Circuito inibidor/habilitador:





&nbsp; 


 


A operação NOT (NÃO) ou inversor 

• Representada algebricamente como:


 



 






A porta NOR (NÃO-OU) 

• Combinação da porta OU com a porta &nbsp;inversora




 




A porta NAND (NÃO-E) 

• Combinação da porta AND com a porta inversora






 


Quadro resumo:






 


Montando a tabela verdade a partir de um circuito

• Primeiro deriva-se a expressão de saída


 






Fonte: Apostila sobre Circuitos Lógicos do Professor Daniel D.
Silveira da Universidade Federal de Juiz de Fora.

Link: http://www.ufjf.br/daniel_silveira/files/2011/06/aula_2.pdf