D82C55AC-2
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Posted by aleksa on May 20, 2008, 3:06 pm
Please log in for more thread options The problem is that the output high voltage of any pin is not 5V, but 3.8V. Nothing is connected to the port pins, VCC is 4.85V. Am I wrong thinking that CMOS chips should have far more than 3.8V on output pins? Thanks | ||||||||||||||||
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Posted by Paul E. Schoen on May 20, 2008, 6:59 pm
Please log in for more thread options I have an old product that used an 8255 to interface to TTL logic, and I recall some problems when we tried to use CMOS versions. I think we could fix it by using pullups, but it was easier to get the non-CMOS version. I don't have the data sheets handy, but I think your parts probably meet specs. I think the 8255s are actually BICMOS. Paul | ||||||||||||||||
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Posted by JeffM on May 20, 2008, 8:06 pm
Please log in for more thread options aleksa wrote:
>I've bought 10 pcs of "82C55" through mail,
You need to stop posting the same question MULTIPLE times. http://groups.google.com/groups/search?enc_author=Rm8PXhIAAACg4cl2KIGrYRRQYaVaGN4o8rhlH0Pnl47z4AZhN98BFg&scoring=d If you want greater coverage, DO IT PROPERLY: http://66.102.9.104/search?q=cache:qHhBKJ-sXKYJ:en.wikipedia.org/wiki/Cross-post+adequately.answered+corrected+with.commas+individually+Disclaimers+*-*-*-marked-as-Read-in-ALL-*-groups+Newsgroups.line | ||||||||||||||||
>
> The problem is that the output high voltage of any pin is not 5V, but
> 3.8V.
>
> Nothing is connected to the port pins, VCC is 4.85V.
>
> Am I wrong thinking that CMOS chips should have far more than 3.8V on
> output pins?
>
> Thanks