This part is a kind of semiconductor called IDT74FCT138.

Function of this product has FAST CMOS 1-OF-8 DECODER WITH ENABLE.

Manufacturers : Integrated Device Tech

Image and pinout :

Some of the text within the PDF file :

® FAST CMOS 1-OF-8 DECODER WITH ENABLE DESCRIPTION: IDT54/74FCT138 IDT54/74FCT138A IDT54/74FCT138C Integrated Device Technology, Inc. FEATURES: • • • • • • • • • • • • • IDT54/74FCT138 equivalent to FAST™ speed IDT54/74FCT138A 35% faster than FAST IDT54/74FCT138C 40% faster than FAST Equivalent to FAST speeds output drive over full temperature and voltage supply extremes IOL = 48mA (commercial) and 32mA (military) CMOS power levels (1mW typ. static) TTL input and output level compatible CMOS output level compatible Substantially lower input current levels than FAST (5µA max.) JEDEC standard pinout for DIP and LCC Product available in Radiation Tolerant and Radiation Enhanced versions Military product compliant to MIL-STD-883, Class B Standard Military Draw [ ... ]

IDT74FCT138 PDF Datasheet Download