----- Original Message ----- 
From: "Jinx" <joecolquitt@clear.net.nz>
Subject: Re: [PIC]6MHz crystal, for 4Mhz 16lc924, how big possibility?


> To my way of thinking (with no hard evidence except the strongly
> suggestive -04 marking), 6MHz is so far out of spec that you'd
> expect a proportion (possibly large, but who can tell beforehand ?)
> of 300 to not work. If it were me, I'd want to test each and every

On the other hand, it probably doesn't make sense for Microchip to make 4
MHz parts in the first place.  I suspect (and have no data to support) that
the 4 MHz parts are simply 20 MHz parts that didn't make it.  Most likely
most of them would run at 19 MHz, so 6 should be a piece of cake.

That being said, I think using 4 MHz parts at 6 is fine for hobbyists, but I
wouldn't do it in a production situation.  4 MHz crystals are less than a
buck in quantity one, half that in hundreds, even cheaper in the larger
case, so even a great deal on 6 MHz crystals can't save too much.  Just one
return would eat up the savings on a lot of units.

--McD

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