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TXS0108E: Can it be used as bi-directional?

Tanveer Raina
Prodigy 50 points
Part Number: TXS0108E
Other Parts Discussed in Thread: TXU0304

HI, 

I am using this chip and on the A side, I have SPI signals coming from the header and on B side, the output signal goes to the components on board. I have 3.3V and 5V regulators on board and i have a pull down on OE pin. I have attached the screenshot for review. I want to make sure the chip will work they way I have it in sch.  

Also, want to make sure, that it works in both direction i.e if I have pin with signal 5V as input then on the other side, the output will be signal at 3.3V. 

  • 0
    TI__Mastermind 40136 points

    Hi Tanveer, 

    I do not see any immediate issues with the given schematic. The TXS0108E does not have any internal logic to detect which side is driving the I/Os. It is passive in nature and open drain based (default I/O state is HIGH until A side or B side drives the device low). Because of the non-buffering architecture, it will best used for driving loads <70pF (you may reference section 11 of d/s for further layout guidelines). 

    While TXS0108E can support SPI applications, it can be more suitable to choose a translator more optimized for SPI, such as TXU0304 and the AXC4T774. 

    Translate Voltages for SPI

    Regards,

    Jack