This part is a kind of semiconductor called 74HCT243.

Function of this product has Quad bus transceiver; 3-state.

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/HCT243 Quad bus transceiver; 3-state Product specification File under Integrated Circuits, IC06 December 1990 Philips Semiconductors Product specification Quad bus transceiver; 3-state FEATURES • Non-inverting 3-state outputs • 2-way asynchronous data bus communication • Output capability: bus driver • ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT243 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A. 74HC/HCT243 [ ... ]

74HCT243 PDF Datasheet Download