Integrated Circuits Used 74LS153 Procedure Add IC 74LS153 into ICBase-1 (74LS153).Connect VCC Port to Pin-20 (VCC) of ICBase-1 (74LS153).Connect Pin-7 (Output) of ICBase-1 (74LS153) to GND Port.Connect Pin-1 (Input) of ICBase-1 (74LS153) to Input-14.