Logic Inverter

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I have two Al Williams PAK's that I am using in my latest project. One is a Pulse output generator and the other is Math CoProcessor. They can use the same IO lines if you toggle the enable pin on the chip.

My Problem, as with lots of microprocessors, a shortage of pins. What I need is a logic converter where I can use one pin and get two outputs.

What I have thought of is connecting my AVR pin to a NOT Gate the output of which would go to one of the PAK's and Teeing the Input to the NOT Gate to the other PAK. This would give, with a Low on the input to the NOT Gate, a High to the PAK connected to the NOT Gate and a Low to the other PAK, just what I want.

My Next Problem: Where to get a NOT Gate? I have looked at the 74LS04, but it has 14 pins and I do not want to use up that much board space. If it was available in 8 pins I could live with that. Are there descrete NOT Gates or some way to do this using less real estate than a 14 pin 74LS04?

Thank you for all the help

Bob Parry

Bob Parry

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There are single gate logic in SMD

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Digikey has some for 0.45C.
Part #TC7SET04FUTCT-ND

Regards,
Steve A.

The Board helps those that help themselves.

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You could do it with a transistor and two resistors, and save yourself the hassle/space of another IC. Sorry for the quick MsPaint.

- Dean :twisted:

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Make Atmel Studio better with my free extensions. Open source and feedback welcome!

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Thanks Dean

That is what I am looking for. I had thought of using one of ny ATTiny15 that I have, but that seemed a little silly. I have all that stuff laying around.

Bob

Bob Parry