Lpc2000

Sorry, my bad!

2.7V seems a lot more reasonable for input level.  So yes, it should 
work without a buffer!

--- In lpc2000@yahoogroups.com, "derbaier" <dershu@s...> wrote:
>
> 
> The 3.4V logic high minimum seems to be on the 1-wire side of the
> interface. The UART side looks like it has the usual 2.7V minimum
> logic high. In that case, it should interface with a CMOS 3.3 volt
> part with no difficulty.
> 
> -- Dave
> 
> 
> --- In lpc2000@yahoogroups.com, "seangra" <sgraham@o...> wrote:
> >
> > Short answer, NO.
> > 
> > For any electrical part you can look in the schematics, find 
the "DC 
> > ELECTRICAL CHARACTERISTICS" section, and check the "INPUT HIGH 
> > VOLTAGE".  In your case it's minimum 3.4V, so the 3.3V output 
from the 
> > LPC2138 won't work.  Odd, because most 5V parts have an input 
high 
> > voltage around 2.5V, as it is with most of my parts on my design.
> > 
> > --- In lpc2000@yahoogroups.com, "fredrikssonjohan" <johan@s...> 
wrote:
> > >
> > > Hi!
> > > 
> > > Sorry if this is a stupid question, but I haven't found any 
good info
> > > about the UART levels so I better ask!
> > > 
> > > Need to connect a LPC2138 to a Maxim (Dallas) DS2480B which is 
on 5V.
> > > Can they talk as it is or do I need a 3.3 to 5V buffer between?
> > > 
> > > Thanks for any help!
> > > 
> > > Cheers
> > > /Johan
> > >
> >
>