This part is a kind of semiconductor called LTC485.

Function of this product has Low Power RS485 Interface Transceiver.

Manufacturers : Linear Technology

Image and pinout :

Some of the text within the PDF file :

FEATURES n Low Power: ICC = 300μA Typ n Designed for RS485 Interface Applications n Single 5V Supply n –7V to 12V Bus Common Mode Range Permits ±7V Ground Difference Between Devices on the Bus n Thermal Shutdown Protection n Power-Up/Down Glitch-Free Driver Outputs Permit Live Insertion or Removal of Transceiver n Driver Maintains High Impedance in Three-State or with the Power Off n Combined Impedance of a Driver Output and Receiver Allows Up to 32 Transceivers on the Bus (C- and I-Grades) n 70mV Typical Input Hysteresis n 30ns Typical Driver Propagation Delays with 5ns Skew for Up to 2.5MB Operation n Pin Compatible with ±60V Protected LTC2862 APPLICATIONS n Low Power RS485/RS422 Transceiver n Level Translator LTC485 Low Power RS485 Interface Transceiver DESCRIPTION [ ... ]

LTC485 PDF Datasheet Download