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TXB0108 and TXB0104

Anand Kumar Rai
Intellectual 720 points
Other Parts Discussed in Thread: TXB0108, TXB0104

Hi folks,

I am using TXB0108 and TXB0104 for voltage level translation of Ethernet RGMII/MII line coming from PHY operative at 2.5V to connect to controller operating at 3.3V.

As mentioned in the datasheet the parts are auto-direction sensing control, and will change the direction automatically without user-interference, which is good. But, my question does all 8 bits of TX0108 and 4 bits of TX0104 change their directions at the same time, or they will change direction individually based on the data fed? Since, I am connecting transmit 4 line, receive 4 line and control 12 lines  from PHY(10/100 Base T) to the level-translator, do I need to use separate translators for transmit, receive and control or connecting data line with control lines in single translator is okay?

Thank you very much in advance.

Thanks and Regards

-Anand  

  • 0
    TI__Intellectual 2020 points

    Hi Anand,

    On both of the TXB devices, the bits will change independent of each other and will not all change direction at the same time. You will not need to use separate translators for transmit/receive or control. But one thing to always consider when using the TXB devices is that they have a weak drive strength and are only meant to drive 70pF of load capacitance (page 11).

    Regards,
    Chris Kraft 

  • 0 in reply to Chris Kraft
    Intellectual 720 points

    Hi Chris,

    Thank you very much for your reply,

    But as go through datasheet of TX0108 or TXB0104, I didn't see anywhere the information what you have mentioned. Can you please mention the datasheet page number or some other reference where it is mentioned that bits will change the direction individually based on input signal fed.

    Thanks and Regards

    -Anand 

  • 0 in reply to Anand Kumar Rai
    TI__Intellectual 2020 points

    Hi Anand,

    I did a quick check and although it is not explicitly stated that the bits will change individually but this can be gathered from Figure 1. Architecture of TXB010X IO cell (page 10 on both datasheets) and the architecture section on the same page. This is a diagram of the IO structure that is repeated for each bit and it shows that there is no other applied direction control from any of the other bits. The architecture section also goes into detail on how the direction sensing is achieved in the TXB010X and this will also explain that there is no dependency upon any of the other bits.

    Regards,
    Chris Kraft 

  • 0 in reply to Chris Kraft
    Intellectual 720 points

    Hi Chris,

    I agree with your explanation but the datasheet is clearly mentioned about the port i.e. either port A or port B. And when we look in terms of data that may be 8 bit or 16 bit, it is 8 bit data at one port or 16 bit data at two ports of level-translator. And whenever, there is flow of data, all the 8 bits or 16 bits go high or low simultaneously. Due to which it is compelling me to think that all the bits or lines of TXB010X will change their directions at a time.

    Thank you for your kind co-operation.

    Thanks and Regards

    -Anand