Padu wrote:

> Regarding my previous problem (see "PIC18F452 and NPN transistor
to control PWM flow"), I've decided to go with two AND gates to let
pass only one signal out of two, and then I'll use an OR gate to merge
the two outputs into one wire.
> 
> My question: are there any chips that encapsulate at 
least 2 AND gates and 1 OR gate in only one package?
The perfect chip would be one with 2 ANDs, 1 OR and 1 NOT,
but since I already have two traces to control the two AND gates,
the NOT is dispensable.

74HC51. triple and or invert gate. I believe there is also and
and/or without an inverted output.

Or you could use a 74HC157 and get 4 channels of 2 to 1 multiplexing.
Needs only ONE control line to decide the channel(s) to be output.

Or you could use a 74HC125 quad tristate line driver and
combine two outputs into one.

Since you already have the 2 control lines, the 74HC125 is probably the simplest
for you, and since it's a line driver, good for heavy loads.

Robert


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