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TXB0101: output have glitch when power on

Part Number: TXB0101

Hi Sirs,

Sorry to bother you.

We found some board TXB0101 output have glitch when power on, but some board didn't have this phenomenon

Our schematic as below, could you help check this is IC characteristic or not?

Do we need take care anything on our design?

 

  • Hi Shu-Cheng,
    I have notified our translation specialist and he should be back with you in the next 24 hours.
  • Shu-Cheng,

    The OE is referenced to Vcca, there are 2 connections one with Vccb and one with Vcca through the pullup resistors.
    Does the R635 resistor installed?
    The glitch is not a characteristic of the device. Also, you have mentioned that this not being observed in some boards but seen on some indicating that it is not expected either.
    do the other boards also have the same power up sequence and similar Res configuration?
    If you power up Vcca first, will this glitch show up?
  • Hi Sirs,

    Thanks for your reply

    Please refer our update as below

    Q: The OE is referenced to Vcca, there are 2 connections one with Vccb and one with Vcca through the pullup resistors. Does the R635 resistor installed

    A: R635 is not stuffed, only R634 stuffed.

    Q:The glitch is not a characteristic of the device. Also, you have mentioned that this not being observed in some boards but seen on some indicating that it is not expected either.
    do the other boards also have the same power up sequence and similar Res configuration?

    A: The power up sequence on normal board is the same as the board have glitch,

    Q: If you power up Vcca first, will this glitch show up?

    A: we can’t change it, because it follow Intel APL power on sequence, besides, I also find the description as below, it should not have power up sequence, could you help to check again?


  • Thanks for the replies, understood.

    Yes, the device was designed in such a way that it wouldnt require any power sequencing and hence any power supply can be ramped up first.

    Are both the devices from the same lot or different lots, since the behaviour is different across boards with similiar power up?

    What else could be changed on the board to acheive no glitch?

  • Hi Sirs,

    Both devices comes from the same lot.

    We need to check with TI the power on glitch is normal or not, since this glitch signal will trigger GE’s watchdog.

    If this glitch is not normal, could you help to figure out what’s difference between both devices?

  • Hi Shu-Cheng,

    Please provide the scopeshot of the normal working device as well for our reference?
    Is there a different manufacturing flow for the other board which didn't have the glitch?
    Please let me know the topside marking of the device.
  • Hi Sirs,

    Update as below

     

    1. Manufacturing flow is always the same.

    2. The boards with glitch issue, we replaced TXB0101DCKR, then the glitch is disappear.

    3. Date codes are all the same: 1731. On the original abnormal boards and the ICs we replaced.

    4. I do not have normal board on hand, but it is confirmed that there is no glitch on normal board.

    Thanks!!

  • Hi Sirs,

    Sorry for pushed, 

    Actually we just want to double confirm with TI that our design is ok or not??

    If ok, I can close this case and take it as IC quality issue.

    Thanks!!

  • Hi Shu-Cheng

    I do not see design concerns with the schematic snip you have shown here.