74HC04 is Hex Inverter NOT gate IC. It consists of six inverters which perform logical invert action. output of an inverter is complement of its input logic state i.e. when input is high its output is low and vice versa.

74HC151?is 8 - Input Multiplexer?16 Pin?IC.?Data Selector/Multiplexer contains full on-chip decoding to select one-of-eight data sources as a result of a unique three binary code at select inputs. Two complementary outputs provide both inverting and non-inverting buffer operation.

The 74HC165 high speed PARALLEL-IN/SERIAL-OUT SHIFT REGISTER utilizes advanced silicon-gate CMOS technology. It has the low power consumption and high noise immunity of standard CMOS integrated circuits, along with the ability to drive 10 LS-TTL loads.