TXS0102 pull up resistor problem

You could add an external transistor, but this also inverts your logic, of course.

What about the TXB0101?

Soccer,

I apologize for the late response on this. My feedback is below:

Soccer Wang said:

As we known, the internal pull up resistor is 10k, when the input signal is floating, the voltage of point 1 is 3.3V*(1k/(1k+10k))=0.3V which is larger than V_IL (max=0.15V), so the output status is unknown at this time. While, my customer requires the output voltage is low during the input is floating.

The VOL and VIL relationship is documented in the TXS0102 datasheet.

Soccer Wang said:

I also checked the other type level translator (SN74AVC2T244, SN74AVC2T245, SN74AVC2T45, SN74AVCH2T45, etc.), but the datasheet doesn’t show the specific data regarding the pull up or pull down resistor.

Could you give any suggestions regarding this requirement (the output is low when input is floating.)?

1k pulldown resistor would be ok. I would avoid the AVCH product since it has bus-hold and we generally recommend not to use pulldown resistors on those parts.

Best Regards,

Nirav