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Original question:

SN74LVC245A: Undershoot Range on data lines.

SN74LVC245A: Input transition rate

Sahil Bhat
Prodigy 70 points
Part Number: SN74LVC245A

The datasheet (section7.3) specifies transition rate as 10 ns/V (max.). I have always defined transition rate in V/ns units.

How should I interpret 10ns/V (max) transition rate? Does this mean that input signal to the buffer should not take more than 10 ns to transition 1V? 

Please advise. 

  • 0
    TI__Guru* 96681 points

    The transition rate of 10 ns/V (max) means that the input signal to the buffer should not transition faster than 10 ns for every volt of change. In other words, if the input signal changes by 1V, it should take at most 10 ns to make that transition. This specification is to ensure that the device operates correctly and to avoid issues such as excessive output errors or oscillations due to slow input edge rates.

    For more details on slow inputs, please see the application report: Implications of Slow or Floating CMOS Inputs