The SN74HC7002D is a quadruple positive-NOR Gate with Schmitt-trigger inputs. This device perform the Boolean function Y = A\ • B\ or Y = (A + B)\ in positive logic. However, because of the Schmitt action, the inputs have different input threshold levels for positive- and negative-going signals. The circuits are temperature compensated and can be triggered from the slowest of input ramps and still give clean jitter-free output signals.
