Xtal choice for Pic16f88

Hi,
Microchip's datasheet for the pic16f88 says:

The PIC16F87/88 oscillator design requires the use of
a parallel cut crystal. Use of a series cut crystal may
give a frequency out of the crystal manufacturer's
specifications.

So I am choosing a 20MHz Xtal to use.
The part I'm looking at is: RAKON -- CRYSTAL, 12SMX (B) 20 MHZ
And the datasheet I have for it is here: http://www.farnell.com/datasheets/90981.pdf

I can't tell from the datasheet if this is parallel cut or series cut
(and in fact I don't really know what these terms mean). Can anyone
shed any light on this.

Or alternatively recommend an alternative small SMD 20MHz Xtal with
decent accuracy, suitable for pic16f88.

Thanks in advance,
Pip.

wrote:
> Hi,
> Microchip's datasheet for the pic16f88 says:
>
> The PIC16F87/88 oscillator design requires the use of
> a parallel cut crystal. Use of a series cut crystal may
> give a frequency out of the crystal manufacturer's
> specifications.
>
> So I am choosing a 20MHz Xtal to use.
> The part I'm looking at is: RAKON -- CRYSTAL, 12SMX (B) 20 MHZ
> And the datasheet I have for it is here: http://www.farnell.com/datasheets/90981.pdf
>
> I can't tell from the datasheet if this is parallel cut or series cut
> (and in fact I don't really know what these terms mean). Can anyone
> shed any light on this.
>
> Or alternatively recommend an alternative small SMD 20MHz Xtal with
> decent accuracy, suitable for pic16f88.
>
> Thanks in advance,
> Pip.

If it specifies a load capacitance it's parallel cut -- and you need to
load it correctly to get the frequency right.

A series cut crystal is the same as a parallel cut crystal; the
difference is just in the tuning, not the construction.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html