Which resonator is best

[mackrackit]

You'll become a guaranteed billionaire if you can come up with a way to control the flow of electrons without wasting them (given off in the form of heat) -- which is once again what kills components. Many argue that it's not possible I don't know enough about science to give an opinion. But then again it is said that if anyone ever does it then most of the theories will need to be rewritten.

My point was that if a PIC will last whatever the advertised time frame is at max speed. Then we say double that by slowing it down. I know I will not be around that long. So if the only reason to slow it down is to get more life, then why bother.

[T.Jackson]

You're absolutely correct bud. I think mister_e needs to go back and hit the books on some relatively "simple" stuff.

[mister_e]

Feel better now ?

[T.Jackson]

Feel better now ?

It's hard to argue that one isn't it? I don't go out of my way looking to pick people up on their errors, but I just couldn't ignore your comment, because it goes against the very foundation on which electronics is taught. You will never have a true appreciate of electronics without it. Just tell yourself that is was a typo -- because I do indeed believe that you are crafted with this "appreciation" and just happened to have overlooked it this time. My reasoning for saying this is because you haven't argued it.

[paul borgmeier]

Dave, I have never seen a max life value from Microchip for a PIC - do you have a reference for this?

Trent, I have never seen reference to microchip PIC life reduction if run at the high end of datasheet-listed allowed speeds (or voltages for that matter). Can you provide reference to this?

Trent, Would Einstein not have been correct with his theory of relativity if he had been challenged and had not replied? (ref: TRENT - My reasoning for saying this is because you haven't argued it.)

[T.Jackson]

Trent, I have never seen reference to microchip PIC life reduction if run at the high end of datasheet-listed allowed speeds (or voltages for that matter). Can you provide reference to this?

You sound like my university tutor marking me down in an assignment for not referencing something in an essay. Best I could do is hand you a 300pg text book on basic electronics and let you decide for yourself as to whether or not there is questionable truth in what I'm saying. I say this because there is no one paragraph, or even just a couple of pages that could be used to support it. You need the whole book, even then you may not conclude that what I'm saying is true.

Trent, Would Einstein not have been correct with his theory of relativity if he had been challenged and had not replied? (ref: TRENT - My reasoning for saying this is because you haven't argued it.)

I know it's besides to the point, but Einstein was actually challenged in his younger years.

[mackrackit]

http://ww1.microchip.com/downloads/e...cs/00097AB.pdf
Not max life values. Just the reliability report.

[The Master]

In the kind of things ill be making (disco lights / pinball machines etc) i would be happy if the chips lasted 10 years. The biggest heat problem i have will be my pinball machine. There are so many lights under the playfield and in the ones ive done in the past it gets quite warm in there but i dont think its enough to harm anything. The drive chips got hotter than the bulbs and they still work fine... except that one that was connected to the wire i accidentally shorted out :P The new one will be slightly ventilated anyway.

Is it just heat that makes a higher speed shorten the life? Could it be possible that doubling the speed doesnt make it heat up too much and so it doesnt shorten the lifespan much? (just a thought)

So, as long as theres no power issue (like running from a battery) and the lifespan isnt critical then using a faster resonator doesnt really make any difference? I suppose it does give you the chance to use that speed in the future though without having to solder a new resonator in

[Acetronics2]

Hi,

The main problem is not run time, but ON/OFF powering count and "violence" ...

design carefully your power supplies, take care of your I/Os , use the "cool startup" features now provided, and your Pics will last ... How much is the MTBF given in Dave's document ???

LOL !!!

Alain

[T.Jackson]

Trent, Would Einstein not have been correct with his theory of relativity if he had been challenged and had not replied? (ref: TRENT - My reasoning for saying this is because you haven't argued it.)

An unsupported argument against the claim that Einstein was a poor student: http://www.abc.net.au/science/k2/moments/s1115185.htm

An unsupported premise for it: http://findarticles.com/p/articles/m...57/ai_68648469

I think the truth is somewhere in between.

[mister_e]

Area: PICmicro Products
Product Group:
Product: Date Created: 4/2/2008 6:48 PM
Issue: Reliability Specification Date Resolved: 4/10/2008 5:30 AM
Description: Hi,
i've a small question for you. Is there any kind of relationship between the OSC speed and the PICMicro lifetime?

Will a PIC running, say @20Mhz, have shorter lifetime than another running@4Mhz assuming they both running the same program, same voltage, ambient temperature etc etc.

Just curious to know.

Thanks for any doc and/or tips.

This is what Microchip told me

Resolution: Hi Steve,

There is no relation between the OSC speed and the PICMicro lifetime.

The device gets into shorter life span conditions only if operated higher (over and above) the absolute electrical conditions as specified by the specific device datasheet.

Hope the information helps you. In case you need further assistance please let us know.

Thanks and Regards,