This part is a kind of semiconductor called 74153.

Function of this product has Dual 4-Line to 1-Line Data Selectors/Multiplexers.

Manufacturers : National Semiconductor

Image and pinout :

Some of the text within the PDF file :

54153 DM54153 DM74153 Dual 4-Line to 1-Line Data Selectors Multiplexers June 1989 54153 DM54153 DM74153 Dual 4-Line to 1-Line Data Selectors Multiplexers General Description Each of these data selectors multiplexers contains inverters and drivers to supply fully complementary on-chip binary decoding data selection to the AND-OR-invert gates Separate strobe inputs are provided for each of the two four-line sections Features Y Y Y Y Y Y Y Permits multiplexing from N lines to 1 line Performs parallel-to-serial conversion Strobe (enable) line provided for cascading (N lines to n lines) High fan-out low-impedance totem-pole outputs Typical average propagation delay times From data 11 ns From strobe 18 ns From select 20 ns Typical power dissipation 170 mW Alternate Military Aerospace devic [ ... ]

74153 PDF Datasheet Download