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ELETRÔNICA DIGITAL

 CONTADORES ASSÍNCRONOS
 CONTADORES SÍNCRONOS
CONTADORES BINÁRIOS
 Contadores Assíncronos crescente (up).
 Contadores Assincronos decrescente(down).

 Contadores
Assíncronos
Decrescente ( up/down).
 Contadores Síncronos.

Crescente

e
CONTADORES ASSÍNCRONOS CRESCENTES / DECRESCENTE

 È constituído a partir do Flip-Flop
mestre escravo, com as entradas (J=K=1).
 O Clock é aplicado ao primeiro FlipFlop
Não possuem o clock em comum.
 Os Flip Flop são ligados em cascata, de
maneira que a saída ( Q ) do Flip Flop
(LSB) é ligado ao clock do seguinte.
FLIP – FLOP TIPO JK ; T ; D
CONTADOR ASSÍNCRONO CRESCENTE
SENSÍVEL A NÍVEL DE DESCIDA ( 1/0 )
Contador Assíncrono
Contador Assíncrono
Diagrama de Transição de Estados do Contador
Contador Assíncrono Crescente de Módulo ( M = 6)
CONTADOR CRESCENTE DE DÉCADA
CONTADOR ASSÍNCRONO DECRESCENTE COM
CONTAGEM DE (1111 á 00000 ).
Diagrama de Transição de Estados para o Contador
Decrescente
Contadores Assíncronos Decrescentes
CONTADORES ASSÍNCRONOS COMO DIVISORES DE
FREQUÊNCIA
 A frequencia de (Q0) é metade da frequencia
do clock.
 A frequencia de (Q1) é metade da frequência
de (Q0), e ¼ da frequencia do clock.
 Logo um contador é um divisor de frequencia
do sinal do clock.
 A divisão será por 2n , onde n é o número de
contadores.
CONTADORES CRESCENTE E DECRESCENTE
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