This part is a kind of semiconductor called ADM4854.
Function of this product has Half-Duplex and Full-Duplex RS-485/RS-422 Transceivers.
Manufacturers : Analog Devices
Image and pinout :
Some of the text within the PDF file :
5 V, Slew-Rate Limited, Half-Duplex and Full-Duplex RS-485/RS-422 Transceivers ADM4850/ADM4851/ADM4852/ADM4853/ADM4854/ADM4855/ADM4856/ADM4857 FEATURES EIA RS-485-/RS-422-compliant Data rate options ADM4850/ADM4854: 115 kbps ADM4851/ADM4855: 500 kbps ADM4852/ADM4856: 2.5 Mbps ADM4853/ADM4857: 10 Mbps Half- and full-duplex options Reduced slew rates for low EMI True fail-safe receiver inputs 5 μA (maximum) supply current in shutdown mode Up to 256 transceivers on one bus Outputs high-Z when disabled or powered off −7 V to +12 V bus common-mode range Thermal shutdown and short-circuit protection Pin-compatible with the MAX308x Specified over the −40°C to +85°C temperature range Available in 8-lead SOIC, LFCSP, and MSOP packages Qualified for automotive applications FUNCTIONAL BLOCK D [ ... ]