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'50MHz Scenix crystal source?'
2000\04\28@134041 by V sml

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Have been online searching for a lonnng time but no luck.

Anyone can help to point me a source or sources to get 50MHz suitable
for Scenix chips?  Scenix FAQ states that 3rd tone type is not that
suitable, anyone has problems or success with that?

Digikey only has oscillator and SMT type.  I am looking for a through
lead type.
No luck with findchips.com too.

Thanks alot.

Cheers, Ling SM

2000\04\28@135736 by Andrew Seddon

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<x-flowed>If you want the crystals look at http://www.parallax.com/, they sell the
whole range and I can verify that they work with no external
components(internal caps). However I would recommend using a clock generator
module if cost is not too important, that`s what I do. You know it will work
and it is not effected as much by bad PCB design.

{Quote hidden}

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2000\04\28@140151 by jamesnewton

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I believe
http://www.parallaxinc.com
supplies that at
http://www.sxtech.com/resonators.asp

---
James Newton spam_OUTjamesnewtonTakeThisOuTspamgeocities.com 1-619-652-0593
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All the engineering secrets worth knowing

{Original Message removed}

2000\04\28@230106 by steve

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> Anyone can help to point me a source or sources to get 50MHz suitable
> for Scenix chips?  Scenix FAQ states that 3rd tone type is not that
> suitable, anyone has problems or success with that?

A 50MHz fundamental crystal isn't cheap. If you really want to spend
US$10-20 per unit, let me know. I have some sources filed away
somewhere.
That's interesting that they say an overtone type isn't that
suitable. Reading between the lines it infers to me that they expect
a lot of support calls if you try and use them. An overtone crystal
isn't that hard to use but unless you actually need the timing
qualities, the ceramic resonators from Parallax (or Murata for qty)
are your best bet.
If you need the accuracy, I'd look seriously at canned oscillators.
You know they are going to work.

Steve.

======================================================
Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680, New Lynn      http://www.tla.co.nz
Auckland, New Zealand        ph  +64 9 820-2221
email: .....stevebKILLspamspam@spam@tla.co.nz      fax +64 9 820-1929
======================================================

2000\04\29@004307 by V sml

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Thanks Andrew, James and Steve.

In the process I found two sources - Abracon,
http://www.abracon.com , another is Yury <yurysspamKILLspammailbox.riga.lv>.

I could not find crystal at parallaxinc.com or sxtech.com , I found
resonators.

Steve, mind get me your info.  Thanks.

Cheers, Ling SM

2000\04\29@012543 by Dan Michaels

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At 11:54 PM 4/28/00 +0800, you wrote:
>Have been online searching for a lonnng time but no luck.
>
>Anyone can help to point me a source or sources to get 50MHz suitable
>for Scenix chips?  Scenix FAQ states that 3rd tone type is not that
>suitable, anyone has problems or success with that?
>
>Digikey only has oscillator and SMT type.  I am looking for a through
>lead type.
>No luck with findchips.com too.
>
>Thanks alot.
>
>Cheers, Ling SM
>

Mouser has FOX500-20 HC49U 50 Mhz parallel mode xtals, but I
don't specifically know if they work with SX.

Digikey shows Citizen xtals at 50 in the latest catalog, they
don't appear to be 3rd overtone.

I have a Scenix SX28-52 Demo Board, and the xtals there are
labelled: ABRACON 50.000M-F AB 9703. Never heard of Abracon.
Regarding what someone said about layout - layout on this
bd is straightforward - and they actually have header jumpers
to select xtal vs oscillator. You;d think if layout were really
critical, this would kill it. There is a gnd plane under the
xtal area, but I suspect it is there for EMI rather than
a run-no-run issue.

Also, I've been using Epson SG-531PH oscillators (not cheap,
from Digikey) on my own boards. Been running the SX at 60 Mhz
this way.

best regards,
- Dan Michaels
Oricom Technologies
http://www.sni.net/~oricom
==========================

2000\04\29@142519 by V sml

picon face
>Mouser has FOX500-20 HC49U 50 Mhz parallel mode xtals, but I
don't specifically know if they work with SX.
>Digikey shows Citizen xtals at 50 in the latest catalog, they
don't appear to be 3rd overtone.

Anyone tried them up already? Thanks for checking up Dan.

>I have a Scenix SX28-52 Demo Board, and the xtals there are
labelled: ABRACON 50.000M-F AB 9703. Never heard of Abracon.

Contacted them (http://www.abracon.com), they were helpful and fast to
reply so far.  I guess their's must work ???  Is it alright to pass
email addresses?  I did so earlier.  Better not to this time.

>Also, I've been using Epson SG-531PH oscillators (not cheap,
from Digikey) on my own boards. Been running the SX at 60 Mhz
this way.

It would be good if it can fit into HC49U footprint.  Overclock an
already speedy SX, brilliant ! What's limit you've pushed?  Put a fan
in and see how fast it can go.  I can send a 486 cpu type of fan from
here (Singapore) if you want to try?

Cheers, Ling

2000\04\29@184602 by Andrew Seddon

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<x-flowed>I`ve had my 50mhz sx52 up and running at 100mhz. It works without cooling
for a couple of hours at least, that`s the longest I have tried it for.
However you wouldn`t want to touch it when your doing that! I should think
with heatsinking you could push 120-130 probably much further on the 100mhz
rated parts.


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2000\04\29@200020 by steve

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> Steve, mind get me your info.  Thanks.

The two sources I have listed for high frequency fundamental AT
cut crystals are:
http:\\http://www.piezotech.com
http:\\http://www.saronix.com

Regards,

Steve.
======================================================
Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680, New Lynn      http://www.tla.co.nz
Auckland, New Zealand        ph  +64 9 820-2221
email: @spam@stevebKILLspamspamtla.co.nz      fax +64 9 820-1929
======================================================

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