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TXB0304: Ambidextrous device?

David Sandler
Intellectual 1910 points
Part Number: TXB0304
Other Parts Discussed in Thread: LSF0204

Hi,

On our previous product, we used the TI TXB0304 to translate from 3.3V to 1.8V on the first pass prototype.  We had so much trouble with the part, that we took it off the board for pass B.  We are again looking for level translation on our new project.  I started looking at other vendors and found a footprint/function compatible part from ON Semi and a functionally equivalent parts from Analog Devices and Maxim.  Both vendors specify that their part has a Vl (low side) and a Vcc (high side).  The ON device which is pinout compatible has pin 1 as the Vlow side and pin 11 as the Vhigh side.  On the TXB0304, pin 1 is Vcca and pin 11 is Vccb.  The TI data sheet does not say anywhere that one side should be the low side and implies that the device is ambidextrous.  On our last project, we had 3.3V connected to pin 1 and 1.8V connected to pin 11 (which is incorrect on the ON part) and like I said, we did not get it to work.  Is it possible that TI has the same restriction (a high side and a low side) and it just isn’t in the spec?  We are looking for a translation solution and after our last experience with the TXB0304, we are a bit gun shy.

Thanks,

David

  • 0
    TI__Mastermind 24985 points
    David,

    The appropriate contact has been notified and will respond on Monday.

    Best,
    Monday
  • 0 in reply to Michael J Schultis
    TI__Guru 62500 points

    Hi David ,

    could let us know the setup information along with scopeshots of input signals and the issues observed. What was the OE referenced to?

    would you be willing to look into LSF0204 device for 1.8V to 3.3V bidirectional translation meanwhile ? For crossreference of the On semi and analog device part, please look here .

  • 0
    TI__Mastermind 30975 points

    Hello David,

    I just tried it in the lab and was able to translate from B to A with VCCA at 3.3V and VCCB at 1.8V. For some reason, translation from A to B would not work, regardless of what voltage I was operating at. This may just be due to a faulty device so I will try to get a hold of a few more TXB0304 EVMs and see if it works. Current draw at VCCA was about 63uA when translating from B to A with VCCA at 3.3V and VCCB at 1.8V.

  • 0
    TI__Mastermind 30975 points
    Hello David,

    Ignore my last post, I had a faulty lab set up. The device functions correctly with VCCA at 3.3V and VCCB at 1.8V. I tested it up to 1MHz, couldn't go any higher due to board limitations.