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If I use some IC which requires clock frequency like 16MHz, can I take one from Arduino?

Or this it too high frequency to travel to neighboring board?

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2  
Set the CKOUT fuse to 1, will give you the clock output. And you have to set PORTB0 to an output (pinMode(8,OUTPUT);). You probably don't want to use to long of a trace/wire. – Gerben Oct 10 '15 at 16:08
    
The expense of properly sending a clock off-board will be greater than generating a new one over there, so only do it if your signals must be synchronized. – Chris Stratton Oct 10 '15 at 17:17
    
Possible duplicate of Arduino constant clock output – Nick Gammon♦ Oct 10 '15 at 20:28
up vote -2 down vote

Yes but you need to know what you are doing. You will need a clock driver and possibly a clock receiver depending on the devices you select. Then you need to modify both boards voiding any possible warranty.

The best answer is NO!

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2  
I don't agree with that. I don't see any problem with using the arduino clock to clock another chip. The whole point of buying an Arduino is experiment and learn! Screw the warranty. I personally have done it often. Its not that hard. – crowie Nov 18 '15 at 12:49
1  
I disagree. Why is it necessary to change the board given Gerben's comment? And I dunno understand, why you are referencing to warranty. Nobody will reasonably try to claim a warranty for a 15€ device where a failure is almost always user generated. If someone over here ever has successfully claimed a warranty for an arduino, let him now speak... – Ariser Dec 18 '15 at 12:45

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