TXB0104: How does Automatic Direction Sensing function work?

The TXB does not sense the direction. The input and output buffers on both sides are always active.

The output buffers a very weak to allow other devices to override the voltage. This results in many limitations; see sections 7.3.2, 7.3.3, and 7.3.5 of the datasheet.

Please show both the input and output waveforms.

U76 is our level shifter:



Re: buffer current - our FPGA has drive of ± 2.0 mA

Joe

Hi Joe,

Can you clarify if the concern here is on pin 3 unable to drive into pin 12 (and if so is there a schematic that I can check)? 

Regards,

Jack