54LS157 DM54LS157 DM74LS157 54LS158 DM54LS158 DM74.
National Semiconductor
DM54LS157 - Quad 2-Line to 1-Line Data Selectors/Multiplexers
54LS157 DM54LS157 DM74LS157 54LS158 DM54LS158 DM74LS158 Quad 2-Line to 1-Line Data Selectors Multiplexers June 1989 54LS157 DM54LS157 DM74LS157 54LS.