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'acceptable resonators for PIC MCUs'
2000\03\21@213959 by Marius Bratrein

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   Does anyone have experience using a ceramic resonator at clock speeds
greater than 16 mhz?  Can anyone tell me which resonators will work?  I
have tried an ECS ZTT series 20mhz resonator, but as far as I can tell,
the PIC does not have enough gain to drive it.  Thanks

2000\03\21@224217 by Peter van Hoof

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I have a bag of the ZTT-20.00MT ones (digikey partno:X909-ND) that I use
on the 16f877 with 100% success. I use the HS oscilator mode.(highest gain)

Peter

{Original Message removed}

2000\03\21@231958 by Harold Hallikainen

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I had trouble with the ECS on a 67c74 at 16 MHz. When I talked with them,
they said that as long as it worked with their inverter circuit
(published on their datasheet, as I recall), the resonator is fine. The
problem is with the chip. Not much help! So, I ended up with murata.
Their website in Japan has a search engine that will give you a part
number for the resonator to use with a particular chip. I've been using
one of their resonators with internal capacitors in several products.
We've probably shipped a few thousand units now with almost no problems.

The almost is because in one product I decided I'd run wide traces the
fraction of an inch from the 16c74 to the resonator (this is maybe 0.150
inch). Microchip did a die shrink from the 16c74a to the 16c74b and our
board stopped working!  All the other products did fine! We had to go
back to 16c74a for this product while we use the B on everything else.
I've revised the board and we'll start using the revised board soon...

Anyway, murata seems pretty good to me!  None of the other resonator
companies I talked with seemed to know what a microcontroller was.

Harold

On Tue, 21 Mar 2000 21:37:57 -0500 Marius Bratrein
<spam_OUTmariusbrTakeThisOuTspamGROVE.UFL.EDU> writes:
>     Does anyone have experience using a ceramic resonator at clock
> speeds
> greater than 16 mhz?  Can anyone tell me which resonators will work?
>  I
> have tried an ECS ZTT series 20mhz resonator, but as far as I can
> tell,
> the PIC does not have enough gain to drive it.  Thanks

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2000\03\22@012921 by Don McKenzie

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Peter van Hoof wrote:
> I have a bag of the ZTT-20.00MT ones (digikey partno:X909-ND) that I use
> on the 16f877 with 100% success. I use the HS oscilator mode.(highest gain)
> Peter

> [.....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU]On Behalf Of Marius Bratrein

> Subject: acceptable resonators for PIC MCUs
>     Does anyone have experience using a ceramic resonator at clock speeds
> greater than 16 mhz?  Can anyone tell me which resonators will work?  I
> have tried an ECS ZTT series 20mhz resonator, but as far as I can tell,
> the PIC does not have enough gain to drive it.  Thanks

I know Jim at Newfound has tried the ZTT-20.00MT in his proto warp-xx
for 876's and had it working fine.

I just got bags of them from 4mhz right up to 20mhz (they don't
manufacture higher frequencies), so I'm sure I will find out very soon.
:-)

Be interesting to see how they go on AVR's also.

Don McKenzie    donspamKILLspamdontronics.com      http://www.dontronics.com

World's Largest Range of Atmel/AVR and  PICmicro Hardware and  Software.
Free Basic Compiler and Programmer http://www.dontronics.com/runavr.html

2000\03\22@071915 by Jim Robertson

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At 05:03 PM 3/22/00 +1100, you wrote:
{Quote hidden}

I have exactly one proto working and really, this has rather limited testing
but it did work flawlessly.

Most of my R&D is done on a PRIME-17 with a 20mhz oscillator pack and a
16F877. This discussion has got me a little nervous that it may not be
safe to release my 20MHz based programmer/ICD and perhaps I should drop
down to 16mhz?

I would appreciate further feedback myself.





Regards,

Jim Robertson
NEWFOUND ELECTRONICS
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Email: newfoundspamspam_OUTpipeline.com.au
http://www.new-elect.com
MPLAB compatible PIC programmers.
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