At 07:40 AM 7/10/02 -0400, you wrote:
> > I noticed that it says "May be required for AT strip cut crystals."
> >
> > Is that what you're using?  Series and parallel cuts behave differently, I
> > think.  I don't know any more than that.
>
>AT cut is independent of whether the crystal is intended for series or
>parallel operation.  There is no series or parallel "cut", even though the
>Microchip docs use that term.

There is a difference between "AT strip cut" and "AT cut", however.

> > All I know is that I use their
> > recommended crystals and never used a series or parallel resistor.  And
> > everything works just fine.
>
>Same here.

With small SMT crystals this may result in problems (premature aging and
even destruction of the crystal) due to overdrive. The maximum drive
levels are an order of magnitude or more lower than the larger
crystals.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
9/11 United we Stand

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