Integrated Circuits Used 74LS153 Procedure Connect GND Port to Pin-7 (Output) of ICBase-2 (74LS153).Connect VCC Port to Pin-20 (VCC) of ICBase-2 (74LS153).Connect Pin-6 (Input) of ICBase-2 (74LS153) to Output-9.Add IC 74LS153 into ICBase-2 (74LS153).