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How I build discrete Input/Output pin?

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gorkin

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Hello all!
I need build a discrete input/output pin (sharead in same connector pin and input/output selection are realized by third "internal" pin). How I can make this using PNP transistor (or MOS high side switch) for output and input activate by ground (internal polarization at VCC)?

Anyone can help-me?

Gorkin
 

don't understand...
 

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