Re: TED badlines, how do they work?

On 09/04/2011 07:40 PM, Segher Boessenkool wrote:
>
>> The power comsumption on +12V helps explain why the 6569 runs so hot.
>
> 400mW... That's not _that_ much is it? You can do about 2W without
> heatsink (depends a lot on your package of course).

The 400mW are just from the +12V, I didn't measure the current drawn 
from +5V. That could be another 500mW or more.


>> Without a heatsink you'll burn your fingers on it. Still, it doesn't
>> seem to mind. TED and the 8501 don't get as hot by a long shot but are
>> still more prone to die. :(
>
> Would be interesting to know how it dies. You can often see it under
> a microscope, hint hint hint :-)

Greg James already got a dead 8501 (and some other chips) from me. We 
can only wait for the die shots now.


> Heat alone isn't such a big deal, but it certainly can be a contributing
> factor to untimely chip death. There must be something worse as well
> though.

I still think it's an unstable HMOS-II-process that killed the first 
8xxx chips from MOS before their time. If that's the case, they got it 
fixed later since the 8xxx-chips with a '85 or later datecode are not as 
'brittle'.

  Gerrit


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