Integrated Circuits Used 74LS153 Procedure Add IC 74LS153 into ICBase-1 (74LS153).Connect Pin-20 (VCC) of ICBase-1 (74LS153) to VCC Port.Connect Pin-19 (Input) of ICBase-1 (74LS153) to VCC Port.Connect Input-0 to Pin-18 (Input) of ICBase-1 (74LS153).