The Wired and Connection
The wired AND connection is a form of AND gate. It uses a pull up resistor and one diode per input to create this function.
The positive voltage from the source is directed away from the output C and towards A and B via the diodes connected directed towards the inputs. When positive logic that is equal to or greater than that of the source is applied to all inputs the source voltage is directed to the output. The AND gate is capable of an infinite number of inputs.
The wired AND function can be achieved by simply tying gate outputs together to a common-collector pull-up resistor. The wired AND function below is achieved by using open collector TTL gates.
The output C is determined by the inputs at A and B according to the truth table (right).
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