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TVC3306 level translation issues

Other Parts Discussed in Thread: SN74TVC3306

Hi!

I'm seeing some issues with the level translating capability of TI's SN74TVC3306.   On a single chip, i've set the reference to 3.3V and the chip's 2 outputs are driving a 244 driver.  One of the output's voltage level is OK and shows a logic high of 3.3V while the other output is only coming up to around 2.8V.

Some freshly manufactured boards are showing this issue, while some are OK.   What confuses me is that the 2 outputs are coming from the same TVC3306,  a single reference voltage, same type of load for each output, yet different voltage level.  One is used as a data output, while the other is used to provide clock.

Has anybody out there seen this before? Ideas?

Thanks!

Regards,

Joel

  • Hi Joel ,
    I will be moving this post into voltage translation forums for support.
  • Hi Joel ,
    Do the non functioning boards start working with fresh device put in ? Do the working boards have same issues once you replace the bad devices into them ? Are there any changes to the flow of manufacturing (cleaning/drying/fabrication )of the boards or a new vendor now compared to the old ?
  • Are all the devices from the same lots ? any difference between the top side markings between good and "bad" devices ? Are the loads these devices driving into different between working and nonworking boards ?
  • Hi Shreyas,

    Thanks for the reply!

    The device markings appear to be the same, like its FAN5, very small print.

    I'll confirm with our CM if there were changes in the manufacturing process and if the devices were from the same lot.

    The load is the same. Just a single 244 buffer.

    I have just ordered replacement parts to replace the failing part and will try out your suggestion of replacing the parts between the failing and working board/parts.

    Are you aware of any similar issues as what i'm seeing?

    Thanks again!

    r/joel

  • Hi Joel ,

    Sorry , I am unaware of any issues being brought to my notice in the recent past regarding this device . I searched in our forum for any issues with this device and i cant find any either . This should be a simple passive translator similar to LSF family .please let know if you find any more info on it .
  • Hi Shreyas,

    I have swapped the failing chip with the passing chip and it proved that the failing chip has gone faulty.  Thanks for that suggestion!  The faulty "pin" outputs a slightly less than expected voltage.  0.3V difference when the reference is set to 3.3V and about 0.2V when set to 2.5V.

    I haven't received any info back from our manufacturer pertaining to the batches of the chips used and where they got it.  I'll ping them again next week.

    In case this isn't batch related, can TI help us debug our issue?  Maybe send you guys the faulty chip or maybe our schematic for review?  I'm just thinking ahead in case we see a large batch of boards having the same problem.

    Thanks!

    r/joel

  • Hi Joel ,

    we can support the debug ,if you want to send us the defective part, then please contact ajsimmons @ ti .com to guide you on the Failure analysis support.