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TXB0104: TXB0104 Level Translator bidirectional

Shlomi Yehezkia
Mastermind 6150 points
Part Number: TXB0104

Hi Team,

I would like to know if TXB0104 level translator can accept same voltage on both side A & B, I want to use it as a bidirectional buffer.

Can you check this issue?

Thanks,

Shlomi

 

  • 0
    TI__Mastermind 44775 points

    Hi Shlomi,

    The datasheet recommends VCCA ≤ VCCB. So this will be fine as long as VCCB doesn't go lower than VCCA.

  • 0
    Guru 284810 points

    Please note that the TXB has very weak output drivers (this is required to allow automatic direction sensing; the other devices must have stronger drivers to allow them to override the voltage level). This means that the TXB is not suitable for most applications where you want a buffer.

    What is the actual problem you're trying to solve? Do you want more drive strength, or the ability do disconnect two buses?

  • 0 in reply to Clemens Ladisch
    Mastermind 6150 points

    Hi,

    The problem is that I need to drive bidirectional JTAG signal with long traces & wires, approx. 50 cm length..

    I didn’t find any other bidirectional buffer that I can use to drive this.

    In this case, I can use TXB on the weak side and TXA in the strong side?

    Thanks,

    Shlomi

     

  • 0 in reply to Shlomi Yehezkia
    Guru 284810 points

    Sorry; with "TXB", I meant the entire TXB0104 device. Both sides (A and B) have weak output drivers.

    It is not possible to increase the drive strength of bidirectional signals without a separate direction signal; if the pins on both sides have different voltages, how should the device know which one is to override the other?