Since an XOR gate is a three-pin deal, with two inputs and one output, only four XORs fit on the 14-pin chip instead of six inverters. By now, you’re entirely used to the 4000-series logic chips ...

Standard CMOS gates used in IC design are inverting for a variety of reasons, including lower area and delay compared to the non inverting versions. So, It would be inefficient to use an inverter when ...