This part is a kind of semiconductor called 26C31.

Function of this product has Quadruple Differential Line Drivers.

Manufacturers : Hitachi Semiconductor

Image and pinout :

Some of the text within the PDF file :

26C31-SMD Quadruple Differential Line Drivers With 3 State Outputs ADE-205-574 (Z) 1st. Edition Dec. 2000 Description The HD26C31 features quadruple differential line drivers which satisfy the requirements of EIA standard RS-422A. This device is designed to provide differential signals with high current capability on bus lines. The circuit provides enable input to control all four drivers. The output circuit has active pull up and pull down and is capable of sinking or sourcing 20 mA. Features • TTL input compatibility • Propagation delay time: 6 ns typ • Output to output skew: 0.5 ns typ • High output impedance in power off conditions • Meets EIA standard RS-422A • Operates from a single 5 V supply • Three state outputs • Low power dissipation with CMOS process • Power u [ ... ]

26C31 PDF Datasheet Download