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TS5A22362DRCT-NM Vcc requirements

Brian Foster
Prodigy 60 points


Hello,

I had a question about the Vcc requirements for the TS5A22362DRCT-NM chip.  I have a design that uses a single line for both signalling and for power to the board.  The typical signal is an 800Hz square wave whose low voltage is 3.3V and whose high voltage is 5V.  Thus, chip Vcc will be this square wave.  Will this have an adverse effect on the chip's function?  Thanks!

  • 0
    TI__Expert 6395 points

    Hello Brian,

    That's an interesting way to supply a part.  Can you tell me more about what the exact application is?  Are you also supplying the Digital input pins with the same varying supply voltage or will they be steady?  What is the max frequency of the Signal/Power Rail?

    Although you are technically not violating any of the datasheet specs, the datasheet was characterized at steady supply voltages.  If you looked at the datasheet, you'll see that we spec different Rons, Cons, etc. at different supply voltages.  This means that as your supply is changing, these datasheet parameters are changing as well which will affect how your system performs.

    The question is whether these adverse effects are negligible or have the potential to break your design.

    Regards,

    Andrew

  • 0 in reply to Andrew_Mason
    Prodigy 60 points

    Hi Andrew,

    We will indeed be supplying the digital input pins with the same varying supply voltage.  The supply voltage is a square wave with a max rise time of 10us, max frequency of 800Hz, and a 50% duty cycle.  The high voltage is 5V and the low voltage is 3.3V.  Thanks!

     

    Brian

  • 0 in reply to Brian Foster
    TI__Expert 6395 points

    Hello Brian,

    I have some samples on order that I will be testing to see if I can observe any strange behavior.

    Regards,

    Andrew