This part is a kind of semiconductor called DS1228.
Function of this product has Transmitter / Receiver.
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 .D t a S a e h t e U 4 .c m o w w w .D a t a e h S 4 t e U . m o c [ ... ]
DS1228 PDF Datasheet Download
