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..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com



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