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Circuitul basculant bistabil (CBB)

Circuitul basculant bistabil (CBB). CBB reprezinta elementul de baza al numaratoarelor si memoriilor. E ste un dispozitiv electronic cu doua stari stabile din care una corespunde cifrei binare 0 iar cealalta cifrei binare 1. E C +. C 1. C 2. R C1. R C2. R 1. R 2. T 1. T 2. r 2.

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Circuitul basculant bistabil (CBB)

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  1. Circuitul basculant bistabil (CBB) CBB reprezinta elementul de baza al numaratoarelor si memoriilor. Este un dispozitiv electronic cu doua stari stabile din care una corespunde cifrei binare 0 iar cealalta cifrei binare 1. EC + C1 C2 RC1 RC2 R1 R2 T1 T2 r2 r1 EB - Circuit basculant bistabil

  2. Conexiunile de intrare si iesire ale CBB R1 R2 AC A T1 T2 r2 r1 Pentru comutarea starii tranzistorilor se aplica pe bazele acestora un impuls negativ. Impulsul negativ are ca scop anularea tensiunii care polarizeaza direct jonctiunea baza emitor in scopul blocarii tranzistorului. EB - Z N U

  3. P S A D C R Circuit derivator UN t UA t UP t US t Formarea semnalelor de intrare N a CBB

  4. x23 x22 x21 x20 D D D 0 1 0 1 0 0 1 1 B0 B2 B1 B3 N N Z Z Z N N Z Numarator binar pe patru biti

  5. + UC C R1 R2 + U2 R3 T2 R6 T1 + U1 R7 R5 R4 Trigger Schmitt

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