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'[PIC]: Recommended crystals for 16F877'
2001\01\27@153112 by Ken Robertson

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Ok, I need some help (again).  None of the crystals that I am trying seem to be working, and I have narrowed it down to pretty much just the crystal.
My first crystal, was a Series one, so I guess it wouldn't work.  I tried to order the Epson CA301 20Mhz crystal from Digi-Key, but they only shipped it in quantities of a 1000, but they said that they had a compatible replacement for it, the Citizen CSA306 20Mhz.  I bought 3 of them, but ended up with 3 bags of 5 for ~$3.  Really cheap.  Their max imp. is 18pf, but Radio Shack didn't have any 18pf, so I got 10.  10 might be too low, not sure, so I'm going to try 22 later.

What I want to know, is can somebody please tell me the manufacture/part no and where you bought it for a crystal that is known to work with the 16F877?  I don't want to spend more and more money on shipping that is more than the part when I don't really need to.

BTW, my test program to see if it works is just storing something in EEPROM.  Taken right from the PIC's datasheet.

Thank you very much,
 Ken

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2001\01\27@174817 by Dan Michaels

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Ken Robertson wrote:
>Ok, I need some help (again).  None of the crystals that I am trying seem
to be working, and I >have narrowed it down to pretty much just the crystal.
>
>My first crystal, was a Series one, so I guess it wouldn't work.  I tried
to order the Epson >CA301 20Mhz crystal from Digi-Key, but they only shipped
it in quantities of a 1000, but they >said that they had a compatible
replacement for it, the Citizen CSA306 20Mhz.  I bought 3 of >them, but
ended up with 3 bags of 5 for ~$3.  Really cheap.  Their max imp. is 18pf,
but Radio >Shack didn't have any 18pf, so I got 10.  10 might be too low,
not sure, so I'm going to try 22 >later.


Every xtal I have ever tried has worked with PIC chips. Havena tried the
'877, but 12C672, C/F84, C62/72/73/74/76 and F874/876. Have tried everything
from 1, 2, 2.048, 4, 4.096, 5, 7.6, 8, 9.8, 10, 14.3, 16, 19.6, and 20.
Bought from Digikey, Jameco, and Mouser. Also tried 1/2 dozen resonators,
and all worked fine, except 16+ Mhz.

Also, I just talked to the field engineer at ECS a week ago, and he
told me series xtals should work ok in most cases, they will just be
off in frequency by ~1% or so.

Why on earth other people always have xtal problems, I have never
understood. I suspect that most problems are elsewhere than in the
xtal ckt.

- danM

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2001\01\27@182434 by Jinx

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> Why on earth other people always have xtal problems, I have never
> understood. I suspect that most problems are elsewhere than in the
> xtal ckt.
>
> - danM

Circuit Cellar 94kB / 5-page pdf backgrounder on crystals

(cut/paste into browser)

www.jameco.com/cgi-bin/ncommerce3/ExecMacro/Jameco/pageDisplay.d2w/re
port?content=cc-toc

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2001\01\27@204431 by Dan Michaels

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Captain J wrote:
>> Why on earth other people always have xtal problems, I have never
>> understood. I suspect that most problems are elsewhere than in the
>> xtal ckt.
>>
>> - danM
>
>Circuit Cellar 94kB / 5-page pdf backgrounder on crystals
>
>(cut/paste into browser)
>
>www.jameco.com/cgi-bin/ncommerce3/ExecMacro/Jameco/pageDisplay.d2w/re
>port?content=cc-toc
>

So, Captain Jinx, sir, have "you" ever had any problems with getting
your xtals to work with PICs?

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