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TXS0108E: design queries

Sandra Pradeep
Intellectual 290 points
Part Number: TXS0108E
Other Parts Discussed in Thread: TXU0304, TXU0104, TXU0204

Tool/software:

Hi TI Team,

Could you please review the implementation of the level translator and share your review comments?

Also could you please clarify the below queries?

  • Could you please verify the above schematics and confirm whether this implementation works?
  • Our application's required speed is 4Mbps, can we use this level translator for 4Mbps signals?
  • please confirm whether the configuration of this level translator is push-pull or open drain.

Thanks 

Sandra

  • 0
    Intellectual 290 points

    Also could you please suggest an alternate level translator that does not have to satisfy the condition "Vcca should be less than Vccb"

  • 0
    Guru 298580 points

    1. The schematic is incomplete. But as far as the components shown are concerned, this will work.

    2. 4 Mbps will work if the other devices have push/pull outputs.

    3. The level translator itself does not change and does not have a different configuration. The only relevant difference between push/pull and open-drain systems is the speed of rising edges; if the other devices output signals with fast edges, then the TXS also runs fast.

    4. In the schematic, all eight signals are shown to be unidirectional. Unidirectional translators (e.g., TXU0104/TXU0204/TXU0304) would be a better choice, and have no supply restrictions.

  • 0 in reply to Clemens Ladisch
    Intellectual 290 points

    Hi Clemens,

    Thanks for your reply.

    Can we use TXB0108RGYR as a drop in replacement for TXS0108ERGYR?

    Also, will TXB0108RGYR support the UART interface?

    What is the maximum speed this Level translator can support?

  • 0 in reply to Sandra Pradeep
    TI__Mastermind 38475 points

    Hi Sandra,

    Yes TXB can be used as a drop in replacement and can be used. May also see section 6.8 of the TXB data sheet specifying 60 Mbps.

    Although I am not sure why interested in the replacement as UART is for fixed direction and the recommendation is typically to not use auto-bidirectional devices for applications that are not auto-bidirectional due to limitations such as 8.3.3 and 8.3.5 of the TXB data sheet. Hence, the TXU recommendation, thanks.

    Best Regards,

    Michael.