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TXS0104E: Logic forum

Hemry Jiang
Prodigy 60 points
Part Number: TXS0104E
Other Parts Discussed in Thread: TXU0304,

Tool/software:

Hi Sir,

How should the schematic be designed for SPI bidirectional transmission (8MHz)

push pull mode : How should the hardware be designed ?

  • 0
    Guru 295240 points

    SPI or QSPI? SPI uses unidirectional signals, for which the TXU0304 would be a better solution

    The other devices (labelled "System Controller" and "System" in the example) must use push/pull outputs. QSPI devices always do this.

  • 0 in reply to Clemens Ladisch
    Prodigy 60 points

    Hi Clemens,

    1. Use SPI [MCU & mouse sensor] 

    2. Is the TXS0104E capable of bidirectional transmission?

  • 0 in reply to Hemry Jiang
    Guru 295240 points

    The TXS is auto-bidirectional, i.e., the same signal line could be used in either direction.

    SPI does not have bidirectional signals. While there are signals going in both directions, each individual signal has a fixed direction. I recommend the TXU0304 instead.

  • 0
    TI__Mastermind 30616 points

    Hi Hemry,

    I agree with Clemens' response here. Please let us know if you have any further questions regarding this topic.

    Regards,

    Jack

  • 0 in reply to Jack Guan
    Prodigy 60 points

    Hi Clemens/Jack,

    Are there any potential issues with using the TXS0104E?

  • 0 in reply to Hemry Jiang
    Prodigy 60 points

    Hi Clemens/Jack,

    TXU0304 supports up to 200Mbps, while the current project only requires 8Mbps.
    The TXS0104E push-pull mode at 24Mbps is closer to the current requirements.
    For the TXS0104E, how can it be switched to push-pull mode, and what aspects of the circuit design should be considered?

  • 0 in reply to Hemry Jiang
    Guru 295240 points

    The TXS itself does not have a push/pull mode.

    When the TXS is driven with push/pull signals, it is faster than when it is driven with open-drain signals.

    The TXS has internal pull-up resistors, so it does not work with pull-down resistors. And due to the edge accelerators, it is sensitive to noise or ringing on the data lines.

  • 0 in reply to Clemens Ladisch
    Prodigy 60 points

    Hi Clemens,

    1.TXS itself does not have a push/pull mode, so what does the datasheet mean?
    2.Do you mean that TXS cannot be applied to this project?

  • 0 in reply to Hemry Jiang
    Guru 295240 points

    1. When the TXS is driven with push/pull signals, it is faster than when it is driven with open-drain signals.

    2. It will work. But in my design, I would use the TXU0304.

  • 0 in reply to Clemens Ladisch
    TI__Mastermind 30616 points

    Hi Hemry,

    Even though the bandwidth of the TXU device is higher and then speed of your application is not very fast (8MHz/ 16Mbps), the TXU will still be a better choice due to its buffering capability and improved robustness (i.e schmitt trigger inputs) over the TXS0104E. Ideally, the TXS0104E is to be used if the signals truly auto-direction per channel. Since there is no buffering circuitry internal to the TXS device, its open-drain outputs provide compatibility to both push-pull and open drain drivers. 

    Regards,

    Jack

  • 0 in reply to Jack Guan
    Prodigy 60 points

    Hi Jack/Clemens,

    Got it, thanks.