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From: firstname.lastname@example.org (carltons)
Subject: Re: Urgent: 3.3V CMOS output to 2.8V CMOS input
User-Agent: NewsWatcher-X 2.2.3b2
NNTP-Posting-Date: Sat, 21 Dec 2002 01:39:57 GMT
Date: Sat, 21 Dec 2002 01:39:57 GMT
In article ,
email@example.com (Sugapes) wrote:
> Jim Thompson wrote in message
> > Use reasonable value resistors so you don't have a current problem.
> > Then parallel each with capacitance (like you were tuning up your own
> > 'scope probe). Be sure to include the input capacitance of the 2.8V
> > device in your estimation.
> > ...Jim Thompson
> I'm sorry, but I don't understand your suggestion. Where you implying
> using a resistive divisor with capacitances in paralel with the
> resistors? I can't already afford the current requirenments of the
> resistive divisor, for the maximum time constant (RC) tolerable. How
> will the parallel capacitances help (I think they only would worsen
> the RC)?
> Please clarify!
> Thank you!
If you're looking for 20 MHz speeds, use voltage tolerant devices at 2.8
as an interface to your device. Look in the books, they're there.
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