TXB0104: TXB0104 wave

Big Bill

Expert 1980 points

Part Number: TXB0104

Dear All:

We are using TXB0104 level translator in one of our custom board to shift SPI 3.3<-->5V

As below picture, you can the Green is MISO wave that is not normal wave， can you explain what cause the wrong wave? Thanks~.

over 6 years ago

0 Emrys Maier over 6 years ago

TI__Guru* 96591 points

It would appear that you have a pull-up resistor connected to M3MISO. Pull-up or down resistors should not be used with the TXB family of translators. If you need to use this for some reason, switch to the TXS or LSF series of translators.

0 Big Bill over 6 years ago in reply to Emrys Maier

Expert 1980 points

Dear

I'm sorry to forget telling you that the Pull-up resistor connected to M3MISO has removed from this board. but the Wave is not still normal. can you help to solve this issue , thanks!

0 Emrys Maier over 6 years ago in reply to Big Bill

TI__Guru* 96591 points

That's good, because looking at the waveforms I was a bit confused. It looks like something is driving the line low -- is there anything else connected on the wire associated with waveform #4?

Logic

Logic forum

TXB0104: TXB0104 wave