74154 1-of-16 inverting decoder/demultiplexer. +----------+ /Y0 |1 +--+ 24| VCC /Y1 |2 23| S0 /Y2 |3 22| S1 /Y3 |4 21| S2 /Y4 |5 20| S3 /Y5 |6 74 19| /EN2 /Y6 |7 154 18| /EN1 /Y7 |8 17| /Y15 /Y8 |9 16| /Y14 /Y9 |10 15| /Y13 /Y10 |11 14| /Y12 GND |12 13| /Y11 +----------+ [This information is part of the GIICM]