This part is a kind of semiconductor called 74HC139.

Function of this product has Dual 2-to-4 line decoder/demultiplexer.

Manufacturers : Philips

Image and pinout :

Some of the text within the PDF file :

INTEGRATED CIRCUITS DATA SHEET For a complete data sheet, please also download: • The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications • The IC06 74HC/HCT/HCU/HCMOS Logic Package Information • The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines 74HC/HCT139 Dual 2-to-4 line decoder/demultiplexer Product specification File under Integrated Circuits, IC06 September 1993 Philips Semiconductors Product specification Dual 2-to-4 line decoder/demultiplexer FEATURES • Demultiplexing capability • Two independent 2-to-4 decoders • Multifunction capability • Active LOW mutually exclusive outputs • Output capability: standard • ICC category: MSI GENERAL DESCRIPTION 74HC/HCT139 The 74HC/HCT139 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottk [ ... ]

74HC139 PDF Datasheet Download