This part is a kind of semiconductor called 74260.

Function of this product has Dual 5-Input NOR Gate.

Manufacturers : National Semiconductor

Image and pinout :

Some of the text within the PDF file :

DM54LS260 DM74LS260 Dual 5-Input NOR Gate April 1992 DM54LS260 DM74LS260 Dual 5-Input NOR Gate General Description This device contains two individual five input gates each of which perform the logic NOR function Connection Diagram Dual-In-Line Package TL F 9824 – 1 Order Number DM54LS260J DM54LS260W DN54LS260E DM74LS260M or DM74LS260N See NS Package Number E20A J14A M14A N14A or W14B Truth Table AaBaCaDaEeY Inputs A L X X X X H B L X X X H X C L X X H X X D L X H X X X E L H X X X X Outputs Y H L L L L L C1995 National Semiconductor Corporation TL F 9824 RRD-B30M115 Printed in U S A Absolute Maximum Ratings (Note) If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply V [ ... ]

74260 PDF Datasheet Download