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???
09/21/05 16:19
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 		 #101317 - it most certainly does
Responding to: ???'s previous message
If this won't go through a long path etc.etc. I see no reason why the absolute worst case 0.1V noise immunity with the creppiest Schottky around won't suffice.
I don't think this issue deserves more attention than this.

It most certainly does. Ground bounce, even on a well designed 4 layer board, can easily exceed 0.1V.

The other aspect of this is that to see if it will suffice, you have to rely on "testing" and what does that tell, but in this case it happened to "work".

Erik

List of 46 messages in thread
TopicAuthorDate
AT89c2051 port pin remains latched            01/01/70 00:00      
   1-to-0 transition current            01/01/70 00:00      
   OC comparator            01/01/70 00:00      
      a diode in series will do...            01/01/70 00:00      
      LM336-5            01/01/70 00:00      
         Price!! and speed?            01/01/70 00:00      
            Hmmmmmm...............            01/01/70 00:00      
               write PID sotfware for mcs51 micro.            01/01/70 00:00      
                  Start it as a new thread            01/01/70 00:00      
      Using LM339 only            01/01/70 00:00      
         LM339!            01/01/70 00:00      
            Pull up to 339            01/01/70 00:00      
               Why?            01/01/70 00:00      
               here are the two schemes            01/01/70 00:00      
                  not 12V, but 5.7            01/01/70 00:00      
                     and            01/01/70 00:00      
                        ???            01/01/70 00:00      
                           Question            01/01/70 00:00      
                              LM339            01/01/70 00:00      
                              open Collector            01/01/70 00:00      
                                 OOPS.            01/01/70 00:00      
                  12V swing            01/01/70 00:00      
                     there were three pictures...........            01/01/70 00:00      
                        yep...            01/01/70 00:00      
   Use P1.0 or P1.1            01/01/70 00:00      
      P1.0 and p1.1 are used            01/01/70 00:00      
   yep!! that is solved            01/01/70 00:00      
      Nothing is solved...            01/01/70 00:00      
         why so complicated?            01/01/70 00:00      
            Vil for 89c2051            01/01/70 00:00      
               then use a Schottkey            01/01/70 00:00      
                  LM339            01/01/70 00:00      
                     It probably will in the lab, the            01/01/70 00:00      
                        noise immunity?            01/01/70 00:00      
                           it most certainly does            01/01/70 00:00      
            Low-voltage noise margin            01/01/70 00:00      
               Real Programmers don't use Pascal            01/01/70 00:00      
                  It's so easy to state your opinion and t            01/01/70 00:00      
                     no more words            01/01/70 00:00      
                  It's amateurish to reduce noise margins            01/01/70 00:00      
                     hair-picking            01/01/70 00:00      
                        Fan-out specification            01/01/70 00:00      
                           Circuits that work on.....            01/01/70 00:00      
                     Rise times at 3MHz            01/01/70 00:00      
                        a small correction            01/01/70 00:00      
   I second the motion            01/01/70 00:00      

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