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THVD1424: Is this component compatible with RS-422?

Mehmet Akkurt
Prodigy 10 points

Part Number: THVD1424

Tool/software:

Hello 

I need an RS-422 IC that I can switch between full duplex and half duplex I found the "THVD1424" IC but officially, there is no source that this IC can work with the RS-422 protocol. Can I use this IC for RS-422?

  • +1
    TI__Guru 53912 points

    Hi Mehmet,

    Yes the THVD1424 is electrically compatible with RS-422 because RS-485 is electrically compatible with RS-422 (RS-485 generally exceeds performance of RS-422 electrically). 

    Generally how you can tell is by looking at the |VOD| spec in the datasheet. If the load is 100 ohms and minimum is >= 2V then the device is electrically compatible with RS-422 PHY as RS-422 is a multi-drop bus where the last receiver on the line has the differential bus terminated with 100 ohms. RS-485 is multi-point and there are two terminations that are 120 ohms - so RS-485 devices generally have stronger drive strength and they load the bus less than standard RS-422 devices.  

    From Datasheet:

    This only indicates compatibility at the electrical layer as this is a PHY only solution - so any protocol that is placed on top of the device is not necessarily guaranteed to work, however the pinouts / features of RS-422 parts are generally the same as RS-485 so I don't foresee a lot of issues - but this part basically is only a component of the PHY layer. 

    Best,

    Parker Dodson