From: not@telling.you.invalid   
      
   Yep, the load on the output buffer transistor will be 1mA   
   max., so the current required to drive it can be kept well   
   within spec.. The resistors used can therefore be of high   
   enough values to keep the currents between outputs very low.   
   This is what I meant by my situation perhaps fitting with the   
   "special cases" statement in the book.   
      
   I was mainly wondering if there was anything wrong with adding   
   current from multiple high outputs in this manner. I   
   understand the totem-pole circuit, but I wondered if something   
   in the IC circuit as a whole might be problematic in this   
   application.   
      
   Perhaps I'm too cautious and I should just build the thing and   
   find out (which is probably what I'll do). On the other hand I   
   though it was worth a question in case I was missing something   
   already known.   
      
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