• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 19 subscribers
  • Views 488 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TXB0108: start up condition and edge rate control

dugan yoon
Prodigy 120 points
Part Number: TXB0108
Other Parts Discussed in Thread: LSF0108, TXS0108E

I have two questions:

1) Does this part come up in a deterministic way into a high state if all inputs are not driven on power up?  

2) Is there a slower edge rate version with a minimum rise/fall time in the ~2 to 4 ns range?

  • 0
    Guru 243770 points
    The TXB architecture with weak positive feedback in both directions ensures that both I/Os of a channels have the same state, but there is no guarantee for any specific state. The power-up state is random.

    The TXB inputs do not have a minimum rise/fall time. The speed of the outputs depends on the load; you could try to add some capacitance, but if the overall capacitance exceeds 70 pF, the outputs become extremely slow.

    What is the actual problem you're trying to solve? Might a passive switch like the LSF0108 or the TXS0108E work better? Do you really need automatic bidirectional translation?