AVR-Chat

At 12:30 AM 4/27/05 +1000, Peter Gargano wrote:

>Paul Maddox wrote:
> > how about the good old 74HC595? serial->parallel latch?
> >
> > http://www.semiconductors.philips.com/pip/74HC595.html
>
>Paul,
>
>  From the on-line datasheet for the 74HC595BQ (above) we find
>
>         Output Drive Capability:
>         +/- 7.8 mA on parallel output
>
>That's OK for a low brightness display, but it doesn't have the drive
>capability if run within its specs.

You can always add a bss123 to the output line to get the drive capability 
(cheap and small).  Rated for 170mA you should be able to get 50 or 60mA 
through it w/o a problem.

Robert


" 'Freedom' has no meaning of itself.  There are always restrictions,   be 
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