• State TI Thinks Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 2 answers
  • Subscribers 16 subscribers
  • Views 708 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TS5A6542: 3V on IN pin with VIO at 1.8V

Nicholas Carley
Genius 9945 points
Part Number: TS5A6542

This device operates with a VIO of 1.8V. Can the "IN" pin support a 3V signal? The max specs make it look like up to 6.5V is okay.

Thanks,
Nick

  • 0
    TI__Genius 9132 points

    Hi Nick,

    The TS5A6542 has logic level shifting feature where you can reference your logic voltage to a different rail than your supply using the Vio pin. Typically we see people use this feature to allow them to switch up to 5.5V signals while still using the lower voltage 1.8V logic.

    You can have 3V on IN if you are no longer using the input logic translation feature of this device - see this thread for more details.

    If you do not need this built in translation feature, we have several 1:2 SPDT switches that do not have the built in logic translation.  I have filtered down the list here on TI.com.   We can narrow down the list further by identifying other requirements you may have. 

    Regards

    Saminah

  • 0 in reply to Saminah C
    TI__Genius 9945 points

    I read through the other post, I see a slight difference in configuration though. 

    VIO will still be powered at 1.8V (not tying VCC and VIO together), so can the IN pin tolerate a voltage that is 1.2V higher than VIO?

    Thanks!

  • 0 in reply to Nicholas Carley
    TI__Genius 9132 points

    Hi Nick,

    No, If VI/O is 1.8V, max voltage on IN would be limited to VIO (1.8V) in that case.

    The other switches I highlighted above do not have the  logic level shifting and can support VIH > 3V.

    Regards

    Saminah

  • 0 in reply to Saminah C
    TI__Genius 9945 points

    Thank you!

    One last question. The other E2E post mentioned tying VCC and VIO together which means VIO can run higher than 1.8V. Can the device run with VCC at ~4.7V and Vio at 3V?

  • 0 in reply to Nicholas Carley
    TI__Genius 9132 points

    Nick,

    You can do that, but you need to make sure you still have valid logic thresholds as they are now being referenced to the new Vio = 3 V.

    In this device, the logic thresholds are referenced to Vio (some parts without 1.8V logic have logic thresholds referenced to Vcc)

    In a device with 1.8V control inputs, the VIH and VIL levels will be fixed to align with the CMOS 1.8V logic standard, regardless of the supply voltage.

    See more details here

    Regards

    Saminah