Daniel Schouten wrote:
.....
>What I'm going to do is enlarging the cap on the OSCOUT pin from
>33pF to 47pF, so that I come closer to the 32pF CL spec.
>Also the Microchip appnote advised to enlarge this specific oscout cap
>in case of startup problems.
.......

Harold wrote:
>        I also went round and round trying to get resonators that were
>guaranteed to work on a 16c74 at 16 MHz. I finally found muRata
>characterizes their resonators for specific chips and frequencies (see
>http://www.murata.co.jp/search/ic-e.html). Microchip could not give me
........

Just for the heck of it, I checked out the link Harold gave, viz-a-viz
resonators for Scenix chips:

http://www.murata.co.jp/Ceramy/owa/ICLIST.showiclist?sKeyHin=SX28AC-HS&sKeyM
ak=SCENIX&sLang=2&cntmax=50

It gives following values for use with their resonators. Rd is series
resistor.

                 C1  C2   Rf   Rd
CSA12.0MTZ       30  30   1M    0
CSA20.00MXZ040   10  10   1M    0
CSA4.00MG040    100 100 100K    0
CSA8.00MTZ       30  30   1M    0
CSTCC4.00MG0H    47  47 100K  470
CSTCC8.00MG0H    47  47   1M  470

Of note is the smaller C values used at higher freq. Daniel, maybe
your caps values are going in the wrong direction, and should be
smaller - despite what the Mchp datasheets say. After all, keep in
mind that following Mchp's advice hasn't produced the results you
want. I have always used 18-27 pF with 20Mhz xtals [although never
tried 'B series chips], and never had a problem.

- Dan