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TXB0108: TXB0108

Part Number: TXB0108
Other Parts Discussed in Thread: TXU0304, TXU0104, TXU0204

Tool/software:

Dears,

My customer use our TXB0108. The DSP signal level is 3.3V, and the MVB board signal level is 5V. TI's TXB0108pwr level conversion chip is used for level conversion.

1) The input of TXB0108PWR chip is connected to DSP F28335, and the output pin is left floating. The wiring is as shown below:

Use an oscilloscope to confirm that the signal level conversion is normal, as shown in the waveform below.

2) Connect any adapter board signal to the MVB board and test the 3.3V signal at the input end and the 5V signal at the output end of the adapter board:

There is a lot of interference between the 3.3V and 5V levels, and the waveform is distorted.

Please help to find the reason, thank you

Best Regards,

Arabella

  • The TXB is an auto-bidirectional device; the input and output buffers on both sides are always active. The capacitance/inductance of the cables introduces ringing, wich looks like an input signal to the TXB and will be output on the other side; this leads to oscillations.

    The TXB works only with short traces between chips on the same boards.

    For unidirectional signals, use a unidirectional translator like the TXU0104/TXU0204/TXU0304.

  • Hi Arabella,

    I agree with Clemens' response here. Please let us know if any additional questions arise. 

    Regards,

    Jack