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SN74LVC2G66: Are I/O terminals 5V tolerant?

Kazuya Nakai59
Guru 21845 points
Part Number: SN74LVC2G66
Other Parts Discussed in Thread: SN74CBT3305C, SN74CB3Q3305

 Hello guys,

 The following is a question about SN74LVC2G66 from one of our customers. Could you please give me your answer for the customer?

Ques: We can see the sentence "Inputs and outputs are overvoltage tolerant allowing them to go as high as 5.5 V at any valid VCC." on  page14 in the device datasheet (SCES325L). Is this correct. I think it is correct for control input terminals (1C,2C). But I think it should be not correct for I/O terminals (1A,1B,2A,2B) because the absolute maximum rating table says Switch I/O voltage= –0.5 ~ VCC + 0.5 V. Is my understanding correct?

 Your answer would be much appreciated.

 Best regards,

 Kazuya Nakai.        

  • 0
    TI__Expert 3180 points

    Hello,

    Many of our switches have internal protection. Your assumption is correct, the I/O of the switch, is dependent on the VCC. 

    Please see the highlighted version of the datasheet below. This was done at 5.5V but this I/O spec will hold true for most VCCs:

    Please follow the tables in our datasheet when using our solution in your applications.

    What is your application that has a higher voltage at the I/O than the Vcc?

    Thank you,

    Louie

  • 0 in reply to Louie
    Guru 21845 points
    Hello Louie,
    Thank you very much for your reply.

    We don't know what the customer application is. We will try to get it but they usually don't tell us their application even if we ask it.

    We are going to suggest them to consider SN74CBT3305C and SN74CB3Q3305. If you have any suitable device for them, could you please let me know?

    Thank you again and best regards,
    Kazuya Nakai.