On Friday, Nov 8, 2002, at 12:12 Australia/Sydney, Kyrre Aalerud wrote:

We have used thousands of 12C508s and not quite as many PIC12C671s and
we are experiencing far better than +/- 3% in the field. I believe that
Microchip's spec originally said +/- 10% (don't have it handy to look
it up).

As far as I am aware, the later chips, such as the 16F628 and the
12F675 were going to have more accurate internal oscillators than the
original internal oscillator designs, but I am not sure if this is
actually the case.

Kyrre's tests certainly support the +/- 3% that I have seen though.

Regards,

Sean

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