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.

74HC164 utilizes advanced silicon-gate CMOS technology. It has the high noise immunity and low consumption of standard CMOS integrated circuits.