Integrated Circuits Used 74LS02 Procedure Add IC 74LS02 into ICBase-1 (74LS02).Connect Input-14 to Pin-2 (Input) of ICBase-1 (74LS02).Connect Pin-3 (Input) of ICBase-1 (74LS02) to Input-14.Connect Input-13 to Pin-5 (Input) of ICBase-1 (74LS02).