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Bidirectional implies that a single pathway allows for power or signals to flow in both directions.

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Digital isolator says it is bidirectional but its block diagram does not follow that statement

I would say that having one unidirectional channel in both directions across the isolation barrier counts as a bidirectional isolator, even if each individual channel is unidirectional. … The claim of bidirectional communication applies to the whole family, not to any one individual IC, so that can be assumed to be talking about the ADuM1281 and ADuM1286, not the -0 and -5 variants. …
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