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OPEN-CIRCUIT FAIL-SAFE

Category: Hardware
Product Number: ADM3485E

Hi ADI team,

The Datasheet is written to support the RECEIVER OPEN-CIRCUIT FAIL-SAFE function. The Truth Table shows that when the input is floating, the RO output is 1.

But we  measure the waveform and find when A-B = floating (bus floating), RO  will goes high after 500ns false Low pulse.

Is it normal? If yes, could you kindly let us know the the principle?

Thanks a lot!