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Question: RS485 connection between 5V and 3.3V

Question asked by Tarzan on Sep 11, 2014
Latest reply on Sep 30, 2014 by Tarzan

Hi there I have a question about ADM2484.
Are there any issues if I use ADM2484 like the attached file?
(The master is ADM2484 with 3V operation and the slave is 5V operation such as ADM4581)

I'm a bit worried about the current flow from ADM4851 to ADM2484's VDD2pin when ADM4851 5V is Tx mode.

And one more thing, apparently both ADM2484 and ADM4851 have True fail safe mode.
Do you think it is okay to remove 1kohm pull-up and pull-down resistor?

 

Best regards,
Tarzan

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