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SN74AHC367: Short term violation of Absolute maximum voltage

Takashi Onawa
Genius 13200 points
Part Number: SN74AHC367

Hi Team,

In one of my customer's system, Input signal to SN74AHC367 sometimes violates its absolute maximum ratings due to undershoot caused by parasitic L and high SR edge output of connected device. There is no pad to populate dump register on the signal pass, so they need to judge whether to revise the board or not. 

the Observed Undershoot was around -1V peak and 5ns duration.


I have received the following question from the above background.

1. Can TI warrant that SN74AHC367 will keep same device reliability in such the short term violation?

2. If no, are there any way to estimate failure rate under the violated voltage level and duration(ex using Weibull distribution and so on)?

Regards,

Takashi Onawa

  • 0
    TI__Guru* 96947 points

    Hello Onawa-san,

    Exceeding the Absolute Maximum Ratings can cause damage to the device. Operating outside of these limitations is something customers must do at their own risk.

    We only guarantee reliability and electrical characteristics within the Recommended Operating Conditions.

    We do not estimate failure rates beyond the datasheet specs -- that would require testing and characterization outside of the definition of the device. 

    We do not characterize devices beyond the datasheet specifications.

  • 0 in reply to Emrys Maier
    TI__Genius 13200 points
    Hi Maier-san,

    Thanks for your prompt response on this.
    OK, I understood.

    Regards,
    Takashi Onawa