I still don't get it. Why hold on to 5V? Okay some
systems work with 5V. If there wasn't any 5V MCU then
we need TTL.....  At any case, a MCU must forward with
the current voltage requirement which is 3.3 volts....


John

--- Herbert Graf <mailinglist3@farcite.net> wrote:

> On Wed, 2006-09-20 at 22:13 -0400, Bob J. wrote:
> > I've been considering going with a PIC24H on my
> next project (need many
> > analog inputs...the PIC24HJ128GP510  has 32 12-bit
> >
>
ADC's)<http://www.microchipdirect.com/ProductSearch.aspx?Keywords=PIC24HJ128GP510>,
> > and as I was trying to find some parts to sample I
> found that the PIC24's
> > aren't available as 5V parts.  What's up with
> that?  That is going to be a
> > problem with some of the devices I plan on using
> with the PIC24, notably
> > some 5V SPI devices and an LCD.
> > 
> > Why would Microchip not produce 5V versions of
> these devices?  
> 
> Probably because the process they are using to fab
> the PIC24HJs isn't
> well suited for running at 5V. Also, running at
> lower voltages allows
> features to be smaller, meaning a smaller die,
> meaning cheaper to fab
> Just a guess on my part.
> 
> > In
> > applications where low power consumption is not a
> requirement I can't see
> > why one would want to migrate their designs to 3V
> unless I'm missing
> > something.
> 
> I think the term "migrate to 3V" is a little off.
> Most of my newest
> designs ARE 3.3V, there was no "migration". Heck,
> some of my designs
> even run at lower voltages. A recent board I worked
> on has a selection
> of either 3.3V or 2.5V for the IO drivers. 
> Most parts these days are 3.3V based. Many are 5V
> tolerant, but in the
> core they mostly run 3.3V. Just look at the ENC28J60
> from MChip. It's a
> 3.3V part. They just made it 5V tolerant on the few
> IO that might see
> 5V.
> 
> 5V in many ways is dead IMHO. I'm surprised it hung
> around as long as it
> did.
> 
> TTYL
> 
> -- 
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