He first built a breadboard decoder circuit that would light 1 of 16 LEDs depending on the detected button press. This was well and good, but he decided that an Arduino-driven LCD display would ...

Nearly every hands-on circuit designer had the multi-volume set of 7400-series data books on his or her shelf and guarded them ... The SN74AC139-Q1 is a dual 2- to 4-bit decoder/demultiplexer.