This part is a kind of semiconductor called 74163A.

Function of this product has Synchronous 4-Bit Binary Counters.

Manufacturers : Fairchild Semiconductor

Image and pinout :

Some of the text within the PDF file :

DM74LS161A • DM74LS163A Synchronous 4-Bit Binary Counters August 1986 Revised April 2000 DM74LS161A • DM74LS163A Synchronous 4-Bit Binary Counters General Description These synchronous, presettable counters feature an internal carry look-ahead for application in high-speed counting designs. The DM74LS161A and DM74LS163A are 4-bit binary counters. The carry output is decoded by means of a NOR gate, thus preventing spikes during the normal counting mode of operation. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the count-enable inputs and internal gating. This mode of operation eliminates the output counting spikes which are normally associated with asynchronous (ripple clo [ ... ]

74163A PDF Datasheet Download