🚀 go-pugleaf

"RFI-EMI-GUY" <Rhyolite@NETTALLY.COM> wrote in message 
news:4a64ac0d$0$5646$9a6e19ea@unlimited.newshosting.com...
> John Larkin wrote:
>> On Mon, 20 Jul 2009 08:02:20 +1000, "David L. Jones"
>> <altzone@gmail.com> wrote:
>>
>>> John Larkin wrote:
>>>> On Sun, 19 Jul 2009 22:04:25 +1000, "David L. Jones"
>>>> <altzone@gmail.com> wrote:
>>>>
>>>>> As promised, an expos� of an issue with the Rigol DS1052E
>>>>> oscilloscope in my latest video blog:
>>>>> http://www.alternatezone.com/eevblog/
>>>>>
>>>>> Dave.
>>>> Do the scopes work?
>>> Yep, they work. So Rigol are obviously getting away with it by hook or 
>>> by crook.
>>> If AD are deliberately under-speccing their normal chips, then it's a 
>>> clever ploy by Rigol to exploit it.
>>>
>>> Dave.
>>
>> We overclock/overstress parts when there's a substantial payoff. One
>> Freescale uP is rated for 16 MHz clock, actually gets wonky at 44, so
>> we run it at 20. One microwave schottky diode is rated for 2 volts
>> reverse, leaks a bit at 7, so we use it at 4. Adding a heatsink to an
>> FPGA can buy some timing margin. Some diodes and cmos parts leak four
>> or five orders of magnitide less than the datasheet guarantees. An
>> 0603 resistor can dissipate a quarter of a watt safely. The trick is
>> to take calibrated risks where there's demonstrated margin and big
>> paybacks, and take zero risk everywhere else.
>>
>> John
>>
>
> Doesn't the manufacturer sort of put themselves at risk that the chip 
> vendor decides to change the process or ship marginal product ("Nobody is 
> buying our 100 MHz parts anymore, so we will save a few bucks and make and 
> ship 40 MHz parts (that pass only to 45 MHz)")?
>
> -- 
> Joe Leikhim K4SAT

Yep. That's what I would be extremely concerned about. If I ever decided to 
run a part over its rated limits (speed wise), I would put in hooks, for 
production testing, to lower its supplies to their minimum and then run 
those tests at the maximum rated d.u.t. temperature.

Of course, in Larkin's case, the only person that can fire him for non 
performance and insubordination is his wife.

Bob
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