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SN74AHC08: How to understand the max value of t_PLH and t_PHL

Noriyuki Takahashi
Genius 9245 points
Part Number: SN74AHC08

Hi team

Could you tell how to understand the max value of t_PLH and t_PHL?

For example,  in case of SN74AHC08, t_PLH and t_PHL are 1ns typical and 7ns max. 

Customer is wondering it's possible that t_PLH is 1ns but t_PHL  is 7ns in one SN74AHC08. 

Or is it ok that customer think that t_PLH and t_PHL in one SN74AHC08 are almost same value?

And are there any materials to understand these things?

Regards,

Noriyuki Takahashi

  • 0
    TI__Guru 56070 points

    Hi Noriyuki san,

    tpd is the worst case of tplh and tphl.

    Please refer to the app note : understanding logic datasheets below:

    typical data is not a guarantee( unless noted in the datasheet) and is tested for nominal sample at room temp. Always consider using the max as the worst case value across PVT.