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Forum Index : Microcontroller and PC projects : Smaller 20mhz X-tal...

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Zonker

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Joined: 18/08/2012
Location: United States
Posts: 723
Posted: 02:47pm 04 Mar 2021
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Morning fine folks...

I am trying to layout a new PCB that will use the PIC32-470 MCU...
In the design, I wanted to try to use a smaller package X-tal than the normal oblong metal can type... Was wondering if this type would work OK... I am not an expert at this by any means and was looking for any advice on a possible selection...

20mhz Crystal - ABM8G.zip


Much thanks...  
 
Grogster

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Joined: 31/12/2012
Location: New Zealand
Posts: 7478
Posted: 10:03pm 04 Mar 2021
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I don't see any reason why not.
The PDF does say that you can specify in the part number, the load caps you plan to use, so I would be going for something like this one:

LINK

You would need to use 18pF caps instead of the 22pF used with the big crystal, but other then that, it should work perfectly.

Naturally, I have not tested this myself, but there is no reason why it should not work.  I have not looked at the frequency stability/tolerance vs the big crystal, but they are probably within a cat's whisker of each other.

EDIT: Make link clickable.

EDIT: Just checked the data for the TXC crystals I used in the MM+ stuff, and they have a frequency stability AND tolerance of +/-30ppm, so the Abracon crystal should be just about a perfect replacement for the through-hole one.  The TXC crystals state 18pF load caps too, but I have been using 22pF on every board ever made, and never had an issue.
Edited 2021-03-05 08:31 by Grogster
Smoke makes things work. When the smoke gets out, it stops!
 
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