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74HC165 at 3.3V

Evan Shultz
Intellectual 285 points


Hi all,

I'm going to be using this parallel-to-serial shift register at 3.3V, and I see it's not been characterized at this voltage in the datasheet (www.ti.com/.../sn74hc165.pdf).

I'm most interested in knowing the TIMING CHARACTERISTICS and the SWITCHING CHARACTERISTIC on pages 6 and 7. Is this data available, either directly or as a recommendation/guess based on the 2V and 4.5V data?

Thanks!

  • 0
    TI__Guru* 97066 points

    The recommended method for finding values between those listed on the datasheet is linear interpolation.  I have found that Excel is great for quickly doing conversions of these values if you need a lot done in a short time.  The image below shows an example of how I usually do this.  If I can provide any other help, please let me know. 

     

  • 0 in reply to Emrys Maier
    Intellectual 285 points
    Hi Emrys,

    The behavior is obviously non-linear based on the 2V, 4.5V, and 6V curves. It's more like a log curve where as Vcc continues to increase the change in value goes down. So do you recommend linear interpolation because it will give a lower bound to the actual value at some intermediate voltage?
  • 0 in reply to Evan Shultz
    TI__Guru* 97066 points

    Evan,

    You are correct that this is non-linear, but the reason we give 3 values on the datasheet is to allow linear approximation.  There is also some guard-banding involved to ensure that the values given are achievable (this is true for basically everything on any of our datasheets).