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Topic: Invert output from 74hc139 2:4 decoder (Read 524 times) previous topic - next topic

magagna

I need a 2:4 decoder and the only one I can find is the 74hc139, but it's outputs are low/on high/off.
I need this reversed because the outputs from the decoder will drive Clock inputs to 4 74hc374's flip flops, which are active high.

Do I use some pnp transistors (and resistors?) to invert the signal, or is there a better way?

Thanks in advance.
http://en.wiktionary.org/wiki/magagna <-- My last name.  Pretty apt.

dc42

Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

magagna

http://en.wiktionary.org/wiki/magagna <-- My last name.  Pretty apt.

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