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TXS0108E: Multiple Voltage Translation

Craig Robertson
Prodigy 70 points
Part Number: TXS0108E

Hi all,

I have used the TXS0108E on a design to translate bidirectional signals between 2.8V and 3.3V. I am now creating a design that needs to interface to the previous design. The new design needs to take the 3.3V signals and translate them to 1.8V. The topology would be:


DEVICE <--2.8V--> TXS0108E <--3.3V--> TXS0108E <--1.8V--> DEVICE


Is it okay to directly connect two TXS0108E devices together? Has anyone done this before?


Thanks a lot for your help.

  • 0
    TI__Guru* 96591 points
    Yes, this is a valid application. You need to take into account that the 'DEVICE' at either end will have to sink current from _all_ of the pull-up resistors (4*10k pull-ups on each line) in order to drive the line low. This shouldn't be a problem for most devices, but some FPGAs have low current drive capabilities.

    Just out of curiosity, why are you translating from 2.8V to 3.3V? I have never seen a 3.3V device that won't recognize 2.8V signals directly, and a 3.3V input to a 2.8V device shouldn't cause any problems either.