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TXB0106: TXB0106 vs LSF0108

Jonathan Navor
Expert 7845 points
Part Number: TXB0106
Other Parts Discussed in Thread: LSF0108, , SN74AXC4T774

Hi Team,

Good day!

We need your help to check our customer’s concern below:

  1. We would like to use TI level translator for 3.3V to 1.8V bi-directional translation for SPI bus. Currently we use TXB0106 but we need higher performance. Should LSF0108 product support higher rate transactions?
  2. I see that TI recommends TXB0106 for SPI interface. However according to its spec, LSF0108 does support push/pull interfaces (like SPI) so if possible I'd be happy to understand better the rationale behind TI recommendation.
    Also, in the practical level, if I do switch to LSF, should I expect achieving lower data rate than what I currently get with the TXB (~30MHz)?

Thank you so much in advance.

Kind regards,

 

Jonathan

  • 0
    TI__Mastermind 42670 points

    Hi Jonathan,

    I recommend the SN74AXC4T774 device for 1. The LSF family is more suited for open drain interfaces. You can technically use it here (I wouldn't say it would give better performance). Interfaces like SPI with set directions are better supported by Direction controlled level shifters like the one I suggested. It will provide better performance.