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???
12/21/06 07:59
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 		 #129882 - Not proven!
Responding to: ???'s previous message
Lynn Reed said:
I have been characterizing the Intersil IS82C55AZ

No, you haven't.

You have been testing one particualr IS82C55AZ chip - or maybe some sample of IS82C55AZ chips.

That most certainly does not guarantee that you can base a design on your figures and know that any IS82C55AZ chip supplied at any time will perform to those "results" - and continue to perform throughout the product's life.

have found it to be both faster and stronger than reported in the data sheet.

You are basically "overclocking" it.

This is nothing new.

Lots of people "overclock" the processors in their PCs and achieve performance beyond the data sheet specs.
Many people get away with it; but others don't.

That's the thing with going beyond the datasheet - all guarantees are off!

List of 29 messages in thread
TopicAuthorDate
The 8255A is stronger and faster than reported.            01/01/70 00:00      
   The Data Sheet rules            01/01/70 00:00      
      How can we rely on that specification?            01/01/70 00:00      
   Not proven!            01/01/70 00:00      
   who give s hoot what you have 'found'            01/01/70 00:00      
      Data sheets don' rule in reverse engineering            01/01/70 00:00      
         Does that mean...            01/01/70 00:00      
            I'm a chip provider, not a user            01/01/70 00:00      
               then do notstate "The 8255A is stronger and fast"            01/01/70 00:00      
                  8255 statements            01/01/70 00:00      
         They do determine what you have to deliver ...            01/01/70 00:00      
            What I Did            01/01/70 00:00      
               Hmmmm ...            01/01/70 00:00      
                  Measuring output DC parameters            01/01/70 00:00      
                     What did you really test?            01/01/70 00:00      
                        DC measurements            01/01/70 00:00      
                           That's why measurements are quick and automatic            01/01/70 00:00      
                              My paycheck?            01/01/70 00:00      
   No!            01/01/70 00:00      
   How?            01/01/70 00:00      
      Measuring Specs            01/01/70 00:00      
   Population v sample sigma            01/01/70 00:00      
      Should know better            01/01/70 00:00      
         Dangerous extrapolations            01/01/70 00:00      
      The other side of the looking glass            01/01/70 00:00      
   The timing issue was the delay ....            01/01/70 00:00      
      Thanks for the tip            01/01/70 00:00      
      8255            01/01/70 00:00      
         do these two things            01/01/70 00:00      

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