AVR-Chat

Robert Adsett wrote:
> 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.

Allegro has a few drivers. I use a A6275:

   http://www.allegromicro.com/ic/leddriver.asp