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SN74AC14: SN74AC14

Giuliano Russo
Prodigy 10 points
Part Number: SN74AC14

Tool/software:

Hello

I found an electrical difference on the input port changing the process from HCMOS 300nm to LBC9 130nm, I noted the change of the characteristic curve (V/I) of the internal input clamping diode, I'm loocking something right?  that could be possible?

Thank you

Giuliano

  • 0
    TI__Genius 12891 points

    Hi Giuliano,

    It's likely the characteristic curve changed through the process change. The die shrunk therefore parasitics in packages can vary from what they were before affecting these slightly. The DS values would not have changed though ultimately leading to very similar behavior.

    Are you having any issues relating to the change or are you just noting that there was a change?

    Regards,

    Owen

  • 0 in reply to Owen Westfall
    Prodigy 10 points

    Thanks Owen

    my circuit works in AC mode, the input is decoupled by a capacitor and when the input signal has a transition the current (about 1mA) flows through the clamping diode and the input voltage is limited due to the diode characteristics, my circuit has to consider that and I try to understand if the process change confirm the difference that I found: 0.5V in case of HCMOS 300nm and 0.65V in case of LBC9 130nm. My question is that values are expected by the process change? and that is a repetitive value?

    Regards

    Giuliano

  • 0 in reply to Giuliano Russo
    Guru 317000 points

    There are no guarantees whatsoever about the characteristics of the internal clamping diodes. If your circuit relies on diode characteristics, add your own diodes.