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SN65HVS883 current draw when powered from 5V only.

Chad Nesbit
Prodigy 10 points
Part Number: SN65HVS883
Other Parts Discussed in Thread: SN65HVS882, SN65HVS885

Tool/software:

Hello all,

I won’t have 24V to power the SN65HVS883.  However, document "IIF-Training_Digital Input Serializers.pdf" indicates I can back-power the chip with 5V and leave the 24V floating. 

I’m assuming the internal regulator is linear, so is it safe to assume the current draw to power the chip (8.7mA) is also the current that needs fed at 5V to run the IC? If not do you know what the current would be?

Thank You,

Chad

  • 0
    TI__Genius 17665 points

    Hello Chad,

    Can you please share the document you mentioned? I can't seem to find it online.

    Thanks,

    Nir 

  • 0 in reply to Nir Gilgur
    TI__Genius 17665 points

    Hello Chad, 

    I have received the document via email.

    Unfortunately there is no information about back powering the device in the datasheet. 

    I can't really confirm what will be the current draw with this design. The provided document doesn't mention the SN65HVS883 at all.

    I recommend using the SN65HVS882 instead, since it is the device in the example. 

    Still not sure about the current draw because the SN65HVS882s datasheet doesn't mention back-powering either. 

    I can't provide a reliable answer, this is something needed to be tested. 

    Thanks,

    Nir 

  • 0 in reply to Nir Gilgur
    Prodigy 10 points

    Hi Nir,  

    Thanks for the reply.  I used the SN65HVS883 in previous products, but after looking at the other versions, the SN65HVS885 actually does exactly what I'm looking for.  It's supplied only by 5V and the 24V pin is now NC.  So now I know what the current draw will be since the datasheet says 6-10mA.  So I think the answer is to just switch to the SN65HVS885 part in the new design.  It would be good to have 125C anyway.

    Thanks for the help,

    Chad