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TXB0108: TXB0108 and TXS0108 have different data rate

Part Number: TXB0108

TXB0108's data rate is 20Mbps. TXS0108's maximum data rates is 110Mbps. They both have one-shot acceleration. But why did they have such a difference?

  • Hi Joanne,

    There is a big difference between the two parts architecture that causes the difference in data rate.

    TXB is designed for push-pull applications and can support higher data rates. Look for the data rates in the timing requirements tables and compare for the same voltages between the parts.

    https://e2e.ti.com/support/logic-group/logic/f/logic-forum/719537/faq-what-is-the-difference-between-txs-txb-and-lsf-devices

    Here is an FAQ that talks about the auto-bidirectional parts.

    Regards,

    Karan

  • Hi Karan,

    One shot circuit is used to speed up the low-to-high transition. It seems that the date rate should also be increased. But LSF has a higher date rate than TXS. I can't understand this difference. Could you explain it in detail?

  • Hey Joanne,

    TXS and LSF both use passive FET translation, which means that the interfacing drivers will heavily dictate the achievable data rates. These training videos on LSF goes into more details on how the architecture works. If data rate is the priority, then you may not be looking at the right devices. If you give me details on the application I can likely suggest a more suitable device.

  • Hi Dylan,

    Thanks for your reply!

    I note that the auto bidirectional voltage translators – LSFxxxx and TXSxxxx can be both used for I2C. It seems that LSFxxxx has a high data rate (100Mbps) than TXSxxxx (24Mbps). So if my customer needs to choose an auto bidirectional translator to achieve I2C logic, TXSxxxx has no advantages.

    So I want to know when LSF and TXS are both used for I2C, the difference between them. And what are the advantages of TXSxxxx?

  • Hey Joanne,

    If you understand more on the LSF operation, I think it would be easier to see the advantages TXS provides. I highly encourage you to watch those training videos. LSF can achieve those high speeds, but you would need to have very strong drivers to do so. I'm not quite sure why this is such a concern with I2C though, that protocol typically has very low data rates. If you don't want to take advantage of the internal pull-ups and edge rate accelerators, the LSF is still a suitable option.