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SN74LVC14A: Communication Failure

Samson P1
Prodigy 100 points
Part Number: SN74LVC14A

Hi,

In our design we are using the SN74LVC14A inverter buffer(and alternate 74LVC14APW- Nexperia) for few SPI signals. 

And we are using NXP (MK10DX256) controller and Maxim(MAX32651) controller as an alternate to NXP.

When we are using NXP controller, the communication through  SN74LVC14A or 74LVC14APW inverter buffer works fine.

But we are seeing communication fail issue with Maxim controller communication through SN74LVC14A part . But the Maxim controller communication works fine with 74LVC14A(Nexperia) part.

Could anyone please let us know why the communication fails with SN74LVC14A part while using Maxim controller? Any differences between SN74LVC14A (TI part)and 74LVC14A(Nexperia Part)?

Regards,

Samson 

  • 0
    Guru 316780 points

    There should be no difference.

    Please show oscilloscope traces with both devices.

  • 0 in reply to Clemens Ladisch
    Prodigy 100 points

    Hi Clemens,

    Thank you for the reply.

    As of now we haven't captured the waveforms. We just replaced the TI part with nexperia part and the communication works without any issue.

    While comparing the datasheet, the only difference noticed is input clamping current. TI mentioned as Max.input clamp current -50mA whereas Nexperia mentioned as Min.input clamp current -50mA. But i'm sure the controllers source current will be less than that.

    Could you please let me know any other differences between those parts?

    Regards,

    Samson

  • 0 in reply to Samson P1
    Guru 316780 points

    Clamping does not happen during normal operation, and the limit of a negative value should be the minimum.

    There really should not be any difference. It might be possible that the device is run outside its specification, but I want to see what actually happens first.