Gee, after all these years, and all those units shipped with HC595s
and not a single failure,
now I discover that I'd screwed up all along. I'm gonna have to study
the specs closer, I guess...

--Bob A

On Fri, Dec 11, 2009 at 2:55 PM, Spehro Pefhany <speff@interlog.com> wrote:
> At 04:16 PM 11/12/2009, you wrote:
>>You might consider using a 74HC595 on an SPI output/clock module. Then
>>you can put your PWM signal on the OUTPUT ENABLE and you are set.
>>Costs 0.25$USD for each 8 signals,
>>with up to 50mA output.
>>
>>--Bob A
>
> More like 35mA, and subject to absolute maximum sink or max source of
> 70 or 75mA TOTAL, so more like 9mA/output (absolute maximum rating
> with all outputs allowed to be active).
>
> TI makes some with internal open-drain DMOS transistors connected to 8
> outputs which can handle considerably more current, but they are not 0.25=
 ea.
>
> Best regards,
>
> Spehro Pefhany --"it's the network..." =A0 =A0 =A0 =A0 =A0 =A0"The Journe=
y is the reward"
> speff@interlog.com =A0 =A0 =A0 =A0 =A0 =A0 Info for manufacturers: http:/=
/www.trexon.com
> Embedded software/hardware/analog =A0Info for designers: =A0http://www.sp=
eff.com
>
>
>
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