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???
05/30/06 12:42
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 		 #117265 - using various, but maybe of interest
Responding to: ???'s previous message
a badly designed board (e.g. all 100nF bypass capacitors were neatly located in the top right corner of the board) I inherited had some reset problems with a 1232 (no surprise) and was "out there" in the 1000s.
This gave me a chance to do some investigating as to noise suspectability.
Maxim (almost immune)
Linear (similar to Maxim, a bit worse, but same within statistical limits)
TI (OK but a bit worse than Maxim)
Microchip (breathe and it resets)

Now with "proper layout" (100 nF soldered directly across the supervisor) all worked flawlessly. The same is true for the same design with a new "approved" layout. The moment I saw the decouplings located as they were I had a professional do a new layout.

Erik

List of 33 messages in thread
TopicAuthorDate
Favorite reset/supervisor for '51?            01/01/70 00:00      
   (TL)7705            01/01/70 00:00      
      correction            01/01/70 00:00      
         Re: correction            01/01/70 00:00      
   MAX813L or SP813L            01/01/70 00:00      
   MAX1232 plus 4k7 pull-up            01/01/70 00:00      
      pullup?            01/01/70 00:00      
         Exactly!            01/01/70 00:00      
   LM809            01/01/70 00:00      
      809?            01/01/70 00:00      
         LM809 - LM810            01/01/70 00:00      
   using various, but maybe of interest            01/01/70 00:00      
      choose one            01/01/70 00:00      
         The internal supervisor (NEVER the Intel            01/01/70 00:00      
         Noise immunity            01/01/70 00:00      
            how to quantify noise immunity            01/01/70 00:00      
               you do not need to            01/01/70 00:00      
                  proper way and bulletproof            01/01/70 00:00      
                     who cares ...            01/01/70 00:00      
                        don't play with words...            01/01/70 00:00      
                           never            01/01/70 00:00      
                              there's no point arguing...            01/01/70 00:00      
                                 it is about the supervisor            01/01/70 00:00      
                              That's not true, Erik!            01/01/70 00:00      
                                 I stick to it.            01/01/70 00:00      
                                    I didn't expect anything else...            01/01/70 00:00      
                                       way too often the highlighted is not the            01/01/70 00:00      
                                          the wolves            01/01/70 00:00      
                                          More measures than your boss like...            01/01/70 00:00      
                                             agree            01/01/70 00:00      
               'How using a watchdog for my watchdog?'            01/01/70 00:00      
   ZSH560            01/01/70 00:00      
      ZSH->ZSM            01/01/70 00:00      

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