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Protection circuit in a bus connection part of  ADM3077E/ADM3490E

Please inform me about a protection circuit in a bus connection part of ADM3077E/ADM3490E.

Is a protection diode the single way or is it bidirectional?
Doesn't a countercurrent occur to a power supply terminal from Rx?

Another question.
How many is the resistance value about pull-up resistor, pull-down resistor and input resistance?

When you can illustrate, I'm thankful.


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