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TXB0104: Can TXB0104 be connected to another TXB0104?

Dallas Clow
Intellectual 340 points
Part Number: TXB0104

We're developing a module to interface to a 3rd party module that uses TXB0104 level shifters on its DIO outputs.  Our module requires level shifters as well.  Can we also use the TXB0104?  This would result in two TXB0104s being connected together.  Will the part work correctly when connected to another TXB0104?  The complete interconnect would be as follows:  2.5V FPGA I/O <-> TXB0104 2.5V to 3.3V <-> TXB0104 3.3V to 2.5V <-> 2.5V FPGA I/O.

  • 0
    TI__Guru* 96947 points
    As described, it will work. However, it's likely that there will be some large parasitics involved that could cause problems.
  • 0 in reply to Emrys Maier
    Intellectual 340 points

    Can you please clarify?  What are the large parasitics that could be a problem?  My expectation is that the parasitic capacitance levels would be pretty standard and well within the specified 70pF capacitive load for these parts.

  • 0 in reply to Dallas Clow
    TI__Guru* 96947 points
    Then you will be fine.

    I mentioned it because sometimes interface cards like you're describing can have pretty hefty capacitive loads - connectors + wires + traces etc.

    I have seen some in the 100's of pF. If you stay under 70pF, it will work fine.