I tried several resonators with internal capacitors on a 16c74a.
The only ones I could get to work reliably at 16 MHz were those from
uRata Erie.  We've probably got over 1,000 units out now with those and
no problems.  Others (Integrity and the ones whose name I can't remember,
but Mouser or Digikey sells them) wouldn't oscillate in up to 50% of the
units.
        I talked with the manufacturers.  Each said that if it worked in
their sampe circuit with a cmos inverter the resonator was fine.  The
problem was with our circuit (which consists of just the 16c74a!).  uRata
actually tests the resonators with a variety of chips.  When I talked
with them they were still evaluating them with PICs, but I went ahead and
tried them anyway.  Never a problem.

Harold



On Tue, 30 Jun 1998 10:23:32 -0400 Roger Morella <rjm@BUFFNET.NET>
writes:
>We have been experiencing some high failure rates with resonators and
>the
>16C57.  We are using 3 different manufacturer's and have experienced
>failure rates in the order of 2.5 to 10 %.  Some of these are
>intermittant.  Someone had mentioned to me that this issue came up in
>the past
>on this list.
>
>Any ideas?
>
>Roger
>

_____________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com
Or call Juno at (800) 654-JUNO [654-5866]