[sdiy] CMOS chip questions

[Antti Huovilainen]

On Sun, 19 Jul 2009, Scott Gravenhorst wrote:

>> Samppa's definitely got a point.  Mixing TTL and CMOS is kinda like putting
>> '74 Chevy Impala parts in your Acura TL.
>
> There are times when one needs more drive current than CMOS provides. 
> One way to deal with that is parallel drivers, but another is bipolar 
> TTL.

And the obvious choice is an extra transistor. As a bonus it can drive any 
voltage level you need (such as mux connected to say +9V when your control 
circuitry needs 3.3V because of interfacing with a dsp).

Antti

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