This part is a kind of semiconductor called PCF8574.

Function of this product has Remote 8-bit I/O expander.

Manufacturers : Philips

Image and pinout :

Some of the text within the PDF file :

INTEGRATED CIRCUITS DATA SHEET PCF8574 Remote 8-bit I/O expander for I2C-bus Product specification Supersedes data of 2002 Jul 29 2002 Nov 22 Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus CONTENTS 1 2 3 4 5 5.1 5.2 6 6.1 6.2 6.3 6.4 7 7.1 7.2 7.3 8 9 10 11 12 13 13.1 13.2 13.2.1 13.2.2 13.3 13.3.1 13.3.2 13.3.3 13.4 14 15 16 17 FEATURES GENERAL DESCRIPTION ORDERING INFORMATION BLOCK DIAGRAM PINNING DIP16 and SO16 packages SSOP20 package CHARACTERISTICS OF THE I2C-BUS Bit transfer Start and stop conditions System configuration Acknowledge FUNCTIONAL DESCRIPTION Addressing Interrupt output Quasi-bidirectional I/Os LIMITING VALUES HANDLING DC CHARACTERISTICS I2C-BUS TIMING CHARACTERISTICS PACKAGE OUTLINES SOLDERING Introduction Through-hole mount pa [ ... ]

PCF8574 PDF Datasheet Download