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SN74CBTD3324C: Logic voltage tolerance

Philip Peterson
Prodigy 10 points

Afternoon all,


I need a 5V->3V3 bidirectional level translator in my design and this one fits the bill. I am assuming that the A terminals should be connected to 5V logic and the Bs should be at 3V3, however it is possible that an external device with 5V signals may be connected to the level shifter's 3V3 side. In this case, would the shifter be damaged? Would it function correctly and just happily pass the 5V signals across without mucking around with them too much?

Thanks.

  • 0
    TI__Mastermind 46480 points

    I dont recognize this part number.  CBTD will work Ok if you put 5V on any of the I/O pins. The output will be 3.3V unless you pull it up.

    Keep in mind that CBTD is for frequencies less than 10Mhz. if you are switching many pins even slower.

    We also have CB3T parts that will translate 5v to 3.3V but you would use 3.3V Vcc instead of 5V. These parts have no frequency limitation. They requre the input be 1V greater then the Vcc