This part is a kind of semiconductor called 29050H.

Function of this product has HD29050.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

HD29050 Dual Differential Line Drivers / ReceiversWith 3 State Outputs The HD29050 features differential line drivers / receivers with three state output designed to meet the spec of EIA RS – 422A and 423A. Each device has two drivers / receivers in a 16 pin package. The device becomes in enable state when active high for a driver and active low for a receiver. Pin Arrangement R1B R1A R1Y 1 2 3 16 VCC 15 D1A 14 D1Y 13 D1Z 12 D Enable 11 D2Z 10 D2Y 9 (Top View) D2A R 4 Enable R2Y 5 6 7 8 Features Driver R2A R2B GND • Built in current restriction when short circuit • Power up / down protection. • High output current I OH = –40 mA IOL = 40 mA Receiver • Input hysteresis (Typ. 50 mV) • In phase input voltage ±200 mV of input sensit [ ... ]

29050H PDF Datasheet Download