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SN74AVC32T245

Todd Leo
Prodigy 50 points
Other Parts Discussed in Thread: SN74AVC32T245

I used a level shifter whose part number is SN74AVC32T245 in my PCB, but I found SN74AVC32T's VCCA and VCCB are short citcuit, so it is not able to be a level shifter.    Can you help me?   its package is BGA package (ZKE).  

  • 0
    TI__Mastermind 30310 points

    Todd,

    Can you please go into more detail about how VCCA and VCCB came to be shorted together?

    Pins C3, F3, L3, and P3 all correspond to VCCB.

    Pins C4, F4, L4, and P4 all correspond to VCCA.

    They are adjacent but not shorted together.

    Regards,

    Brian

  • 0 in reply to Brian Berner
    Prodigy 50 points

    Dear Brian:

            I read datasheet of SN74AVC32T245ZKER, and I knew VCCA and VCCB shouldn't short together, but  VCCA and VCCB of  chip are shorted together.

     

    Is it reasonable?

     

    Regards    Todd

  • 0 in reply to Brian Berner
    Prodigy 50 points

    Dear Brian:

            I read datasheet of SN74AVC32T245ZKER, and I knew VCCA and VCCB shouldn't short together, but  VCCA and VCCB of  chip are shorted together when I test a new chip by a multimeter.

     

           originally, I soldered SN74AVC32T245ZKER on a board that I designed, and I found VCCA and VCCB's voltage is the same, and I tested resistor between VCCA and VCCB, and they are short together. Then I test two new chips that didn't been soldered on my board, and VCCA and VCCB are short together.

    the results are different between datasheet and my test results.

    I have called vendors, and he will bring new chips to me to test in the noon.

     

    regards

      

     

    Is it reasonable?

     

    Regards    Todd

  • 0 in reply to Todd Leo
    TI__Mastermind 30310 points

    Todd,

    Yes, please check with the new parts when they arrive from the vendor.

    Also, please verify the top-side marking of the part says "WY245".

    If there is still an issue, you can ask your vendor to return the parts to TI for analysis.

    -Brian

  • 0 in reply to Brian Berner
    Prodigy 50 points

    Hi Brian:

     

         I got new chips, and they don't have short circuit between VCCA and VCCB.

    thanks.

    BR Todd