CD4011 is a member of the CD40xx CMOS IC series. The CD4011 IC contains four independent NAND gates. The devices perform the Boolean function Y = A × B or Y = A + B in positive logic. This IC is used in AV Receivers, Portable Audio Docks, and Blu-Ray Players.CD4011 used for performing the Logic NAND function. When you want to use it as a logic inverter, NAND gates in this chip can be reconfigured to make them NOT gate.