fred jones wrote:
>> There is a tradeoff between speed and current consumption with the
>> resistor divider, but that is no different than the tradeoff of what
>> family gate to use for the other direction. My standard answer is 2K
>> ohms in series followed by 3.9K ohms to ground for 5.0V to 3.3V, but
>> some cases may require lower values. 2Kohms // 3.9Kohms = 1.3Kohms, *
>> 100pF = 130nS, so that should be good for up to 2MHz square wave
>> considering 100pF is very high for on-board traces.
>>
>> Do you have any fact-based objection or is your comment just silly
>> superstition?
>
> Where did you get 100pF in your calculations?  Is this just a
> conservative value you chose for a rough estimate?

Yes, very conservative for a trace that stays on the board.


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