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SN74LVC32A: Input transition rise and fall rate

Part Number: SN74LVC32A

Hello team,

My customer use our SN74LVC32A, now they test the input signal and the Input transition rise and fall rate is 10ns/V, which is higher than 7ns/V(our spec), it is OK, any risk? thanks

Regards,

Nanfang

  • Hi Nanfang,

    Short answer - we can't guarantee operation when a spec is outside of those on the datasheet.

    Long answer - It is a good idea to keep the signal edges at CMOS inputs as fast as possible to reduce power consumption and limit the chances for oscillation. This being said, the dt/dv spec is recommended to ensure that all of the other device specs can be guaranteed. If their input signal is slightly outside the required spec, they might also find that the dynamic power or other specs are also slightly outside of our datasheet ranges. However, I don't see this being a problem for normal operation of the part. Logic is rather robust, and even when 'mistreated,' it will work well for a long time. I doubt they will ever have a problem.
  • Hello,

    My customer also compare NXP device spec, the max tr/tf is 20ns/V (VCC=1.2 to 2.7V), is 10ns/V(VCC=2.7 to 3.6V), but our spec is 7ns/V. They want to know if our part spec can be change to the same as NXP part, thanks

    Regards,
    Nanfang
  • Hello,

    If there is only one transition of my customer's application, and the rise and fall rate is 10ns/V, i understand there is dynamic power, but there is only one transition, do you think it is OK? Can we provide the max dt/dV data which broken our part? thanks

    Regards,
    Nanfang
  • 10 ns/V is 43 % above 7 ns/V. That's near enough that it problably will not be too bad. (And I cannot give a definition of what "not too bad" means; there are no guarantees.)

    If the customer wants a device with the NXP specifications, they must buy it from NXP.