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THVD1520: Input to Unpowered IC

Part Number: THVD1520

Tool/software:

I am designing a system with another backup system and these receive the same 485 signal in parallel. This backup system may be unpowered, thus the transceiver would be without supply. Is there a problem with this configuration and we should disconnect the signals to these pins or the pins keep HiZ?

With this parallel configuration should we have some extra considerations?

Thank you. Kind regards.