> Thanks for answering. This is very simple: There is basically 
> no change in
> written specs between the 16C54 and 16F54 in this area. The 
> 16C54 (and a 16F84 I
> also tested) withstands the use in this circuit perfectly, 
> with -7mA drained
> from an input pin, the voltage is less than -0.6V and 
> everything is fine. With
> 16F54 the voltage is higher although the current is lower. So 
> either I am
> missing something very obvious OR something has indeed 
> changed and the datasheet
> needs updating. Imho.

If I understand you right: You used a chip outside its specs and it
worked. You use the newer chip this way and it fails. And you are
surprised?

Wouter van Ooijen

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