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TXB0108 IO Question

Ray Power
Prodigy 10 points
Other Parts Discussed in Thread: TXB0108

I am using the TXB0108 level shifter in a circuit, and I had a few questions.  If I set VccA and VccB to the same voltage (3.3v) will this cause any problems, or will it not adjust the signal?  The A Pins will always be driven with 3.3v signals, while the B pins will either need to be 3.3v or 5v.  I have a switch in the circuit to set VccB as either 3.3v or 5v, but I just wanted to make sure that the chip supports this before I went forward with the design.

In addition, would anything happen if I set VccA to 3.3v, VccB to 5v, and sent a 3.3v signal through the B pins (From B to A)?  In other words, can i send a 3.3v signal through the B pins when I have set VccB to 5v?

  • 0
    TI__Genius 9085 points

    Hi Ray,

    You can set VccA and VccB both to 3.3V. Just keep in mind you have to keep VccB greater than or equal to VccA.

    With the VccB set to 5V,  the minimum valid high for B port input is 3.25V (Vcc*0.65.) You'll be fine with an 3.3V input.

     

     

    Regards,

    Hattie 

     

  • 0 in reply to Hattie
    Intellectual 300 points

    Hi,

         I am using TXB0108 in my design. It is specified that TXB0108 has very "low dc drive strength", but not given exactly the values of IOH & IOL.

    Can anyone tell me what is the dc drive strength supported by TXB0108.

    Also is there any bidirectional voltage translator (auto direction sensing) with higher dc drive strength.

     

    Thanks & Regards,

    Rahul.