This part is a kind of semiconductor called 74LS47.

Function of this product has BCD to 7-Segment Decoder/Driver.

Manufacturers : ON Semiconductor

Image and pinout :

Some of the text within the PDF file :

SN74LS47 BCD to 7-Segment Decoder/Driver The SN74LS47 are Low Power Schottky BCD to 7-Segment Decoder/ Drivers consisting of NAND gates, input buffers and seven AND-OR-INVERT gates. They offer active LOW, high sink current outputs for driving indicators directly. Seven NAND gates and one driver are connected in pairs to make BCD data and its complement available to the seven decoding AND-OR-INVERT gates. The remaining NAND gate and three input buffers provide lamp test, blanking input / ripple-blanking output and ripple-blanking input. The circuits accept 4-bit binary-coded-decimal (BCD) and, depending on the state of the auxiliary inputs, decodes this data to drive a 7-segment display indicator. The relative positive-logic output levels, as well as conditions required at the auxiliary in [ ... ]

74LS47 PDF Datasheet Download