This part is a kind of semiconductor called 74LS245.

Function of this product has Octal Bus Transceivers.

Manufacturers : ON Semiconductor

Image and pinout :

Some of the text within the PDF file :

SN74LS245 Octal Bus Transceiver The SN74LS245 is an Octal Bus Transmitter/Receiver designed for 8-line asynchronous 2-way data communication between data buses. Direction Input (DR) controls transmission of Data from bus A to bus B or bus B to bus A depending upon its logic level. The Enable input (E) can be used to isolate the buses. http://onsemi.com • • • • Hysteresis Inputs to Improve Noise Immunity 2-Way Asynchronous Data Bus Communication Input Diodes Limit High-Speed Termination Effects ESD > 3500 Volts LOGIC AND CONNECTION DIAGRAMS DIP (TOP VIEW) VCC 20 E 19 B1 18 B2 17 B3 16 B4 15 B5 14 B6 13 B7 12 B8 11 LOW POWER SCHOTTKY 20 1 1 DIR 2 A1 3 A2 4 A3 5 A4 6 A5 7 A6 8 A7 9 A8 10 GND PLASTIC N SUFFIX CASE 738 TRUTH TABLE INPUTS OUTPUT E L L H DIR L H X Bus B Da [ ... ]

74LS245 PDF Datasheet Download