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About ADM485

Hi there,

I have a question about ADM485, RS-485 transceiver.

http://www.analog.com/media/en/technical-documentation/data-sheets/ADM485.pdf

The datasheet says this device has fail-safe feature.

Could you be explain what is the fail safe feature of ADM485?

I also found application note, it mentions true-fail-safe feature.

http://www.bdtic.com.cn/download/adi/AN-960.pdf

ADM485's fail safe has this true fail safe feature?

If it's not, what is the differences?

Best,

Tarzan