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???
01/16/07 23:49
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 		 #130936 - Pb solder...
Responding to: ???'s previous message
Richard,


(wearing my isotope geologist's hat now...)

Most lead found on this planet is a decay byproduct of uranium. Which means that most lead has minute, but detectable amounts of uranium in it. Most people don't know it, but U-238 is radioactive. It has a half life of 4.51 x 10^9 years, and decays by alpha to Pb-206. The particles get ejected with substantial energy, and you can actually date a rock by counting the fission tracks in an electron microscope.


So why am I bringing this up??? At current integration levels, lead solder, containing minute traces of uranium poses a bit-flip risk to the circuitry. It has bitten several large manufacturers that should have known better. Those Pb free packages are more than just a feel good measure.


Rob


List of 62 messages in thread
TopicAuthorDate
mcs-48            01/01/70 00:00      
   Old-timer ... like me ...            01/01/70 00:00      
   Code conversion            01/01/70 00:00      
   pls calrify            01/01/70 00:00      
      pls ???            01/01/70 00:00      
         You guys know he can\'t spell ...            01/01/70 00:00      
            Dyslexics Untie!            01/01/70 00:00      
               I don't know of any spell-checking on 8052.COM            01/01/70 00:00      
                  spellchecker built-into the browser            01/01/70 00:00      
                     Yes, that would be irritating ...            01/01/70 00:00      
      !!! SMS ALERT !!! SMS ALERT !!!            01/01/70 00:00      
         pls is a 'regular' abbreviation :)            01/01/70 00:00      
            Well, we learned it differently ...            01/01/70 00:00      
            Yes, "pls." is a long standing convention ...            01/01/70 00:00      
               They both appear in the dictionary ...            01/01/70 00:00      
      mcs-48            01/01/70 00:00      
      mcs-48            01/01/70 00:00      
         we know, but how can we halp you if you do not ans            01/01/70 00:00      
         What, exactly, does it do?            01/01/70 00:00      
         So where's the problem?            01/01/70 00:00      
            start by designing something that works            01/01/70 00:00      
               PL/M?            01/01/70 00:00      
                  Was there an HLL for the '48?            01/01/70 00:00      
                     I dunno            01/01/70 00:00      
                        I doubt it ...            01/01/70 00:00      
                        I dunno            01/01/70 00:00      
                  No PL/M...            01/01/70 00:00      
                     Re: It looks like PL/M is completely dead            01/01/70 00:00      
                        frankly, I'm surprised there isn't more of that            01/01/70 00:00      
                           PL/M & CP/M            01/01/70 00:00      
                              CP/M/ RTOS            01/01/70 00:00      
                                 Why would anyone do that?            01/01/70 00:00      
                                 Fun with retro-computing            01/01/70 00:00      
                           two sides of the coin            01/01/70 00:00      
                              Whta did you mean here?            01/01/70 00:00      
                                 I can see only very few, if any cases            01/01/70 00:00      
                                    I'm with you, Erik, but there are a few ...            01/01/70 00:00      
                                       you mistook what I said            01/01/70 00:00      
                                          at the risk of starting yet another \"food-fight\"            01/01/70 00:00      
                                             What's an OS?            01/01/70 00:00      
                                                Whats an OS?            01/01/70 00:00      
                                                   the misnamed RTOS            01/01/70 00:00      
                                                      once again, I agree            01/01/70 00:00      
                                                         Embedded RTOS            01/01/70 00:00      
                                                         I a way I agree            01/01/70 00:00      
                                                            reasons for OS            01/01/70 00:00      
                                                            about those soft errors, Erik ...            01/01/70 00:00      
                                                               Pb solder...            01/01/70 00:00      
                                                linker!            01/01/70 00:00      
                                                   Linker?            01/01/70 00:00      
                                                      big baggage?            01/01/70 00:00      
                                                         the difference            01/01/70 00:00      
                                                            the BIG PC is costly, too            01/01/70 00:00      
                                                               which makes me recall            01/01/70 00:00      
                                                                  Microsoft? :-)))            01/01/70 00:00      
                                                               Why? My 4-year old %$#@! PC isn't too slow.            01/01/70 00:00      
                                                            There's a way to fix this ...            01/01/70 00:00      
                                                      Linker?!            01/01/70 00:00      
                                                         Public school            01/01/70 00:00      
                                                            Self-esteem's intact? We'll fix that!            01/01/70 00:00      
   8051 i/o port expander            01/01/70 00:00      
      suggestions            01/01/70 00:00      

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