This part is a kind of semiconductor called DS1275.
Function of this product has Line-Powered RS-232 Transceiver Chip.
Manufacturers : Dallas Semiconductor
Image and pinout :
Some of the text within the PDF file :
w w a D . w S a t e e h U 4 t m o .c w w w a .D S ta e h U 4 t e .c m o w w w .D a S a t e e h U 4 t m o .c [ ... ]
DS1275 PDF Datasheet Download
