Alternativa para abaixar tensão em linha serial 5v/3v3

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olá galera, alguém pode me ajudar, preciso controlar um shift register 3v3, usando um arduino com 5v, alguém sabe qual melhor alternativa (sem usar ci) para fazer isto levando em consideração "alta velocidade" de clock shift register?

as opções que pensei até agora são seguintes, aí queria saber qual é melhor em termos de velocidade, proteção, etc.
lembrando que direção sinal é 5v (esquerda) para 3v3 (direita).



e aí, a, b, c ou d (ou outra ideia)?

edit: resolvido! apenas colocando em evidência o link postado pelo amigo hugopt para referências futuras
http://jamesreubenknowles.com/level-shifting-stragety-experments-1741/comment-page-1

eu não usaria resistores para reduzir tensão, pois o valor será variável de acordo com amperagem. você pode usar diodos em série, pois é sabido que eles têm uma queda de tensão de +- 0.6v.

porque não pode usar ci? existem várias opções que fazem essa redução facilmente para você.

abraços,


Arduino Forum > International > Portugues > Alternativa para abaixar tensão em linha serial 5v/3v3


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