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SN74LVC14A: VCC powered at 5V

Gordon Su
Intellectual 300 points
Part Number: SN74LVC14A
Other Parts Discussed in Thread: SN74AHCT14

Hi,

Recently I realized that I powered LVC14 part with 5V instead of recommended 3.3V in some design. I noticed that datasheet says the absolute maximum rating for VCC is up to 6.5V. I guess the IC process and design rule followed allowed the device to operate at 5V. Maybe the power consumption or timing parameter are not that impressive beyond 3.3V. That's why the device is spec at up to 3.3V? For little logic LVC family VCC can go up to 5V. Can you advise the impact of this mistake?

Going forward I am thinking to replace LVC14 with ACT14. Power consumption and speed are not any concern. what do you think?

BR

Gordon

 

  • 0
    Guru 318760 points

    Your observations imply that 5 V should work in practice. Probably. The absolute maximum rating shows that there will be no permanent damage.

    If I had to guess, I could imagine that switching all outputs at the same time would result in too much noise when running at 5 V (which is why little logic allows it).

    You mention only power consumption and speed as being of no concern, so if you care about price or noise, and if you can live with the lower drive strength, choose the SN74AHCT14.