Which resonator is best

[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,

[mackrackit]

Well that clears that up!

[skimask]

I agree completely with the Microchip reply...
However, doesn't it looks too much like a 'canned statement'?
I wouldn't doubt that, all other things being equal, a PIC running at 20Mhz would fail sooner than that exact same PIC running at 4Mhz.
But how much sooner? What kind of time scale are we talking about here? Would any of us, or our offspring be around to mark the time at which one or the other failed? Kind of like measuring how long an EEPROM will hold data. EEPROMs haven't been around for the 100's of years it would take for one to supposedly degrade and lose data.

[The Master]

For the things im making at the moment i have no need for them to continue working longer than i do. If i will not live to see my devices fail with either osc then it doesnt bother me which i use.

I would have thought that a higher speed would shorten the lifespan but i think it depends on what actually fails. If the inner workings of the chip will only last for a certain amount of switching (like some relays can only switch 100,000 before they are due to break) then it would shorten the lifespan (twice as many switches, half the length of time).

That reply suggests that the lifetime doesnt have anything to do with that and it may be something else. Maybe something inside degrades over time?

Just my thoughts anyway

[precision]

I always use MAX7375AXR805+ , Where xtal failed and serial data disrupt at 80 degr.C.

Great performance. Try it with two free sample order.


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