Synchronized distributed clock design for multiple microcontrollers

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wlamers

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I have a design that requires two identical microcontrollers (NXP LPC43xx series) to be clock synchronized. Main objective is to have a timer in both at the same clock speed. What would be the best way to achieve this? I know there are clock distribution IC's requiring only one input crystal. Note: the end product is subjected to high vibrations (and high temperatur range), so the best solution would be one that is vibration and temerature insensitive.
 

yes, it's possible to do this...

Please make sure to keep equal track lengths for driving the clock inputs of two micros.
This is really important to keep proper timings...

Remember, signals travel about half of the speed of light on FR-4 PCB boards... therefore differences in track lengths makes a big difference in signal travel time...

cheers,
per_lube
 



Hellp per_lube,

Thanks for your response. I am aware of trace length matching (like USB high-speed routing). But what would be the best solution in terms of a clock generator with multiple outputs (and insensitivity for vibration). Do you recommend a specific generator (e.g. From Maxim)?
 

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