This part is a kind of semiconductor called MM88C30N.

Function of this product has Quad Single-Ended / Dual Differential Line Driver.

Manufacturers : National

Image and pinout :

Some of the text within the PDF file :

MM78C29 MM88C29 Quad Single-Ended Line Driver MM78C30 MM88C30 Dual Differential Line Driver February 1996 MM78C29 MM88C29 Quad Single-Ended Line Driver MM78C30 MM88C30 Dual Differential Line Driver General Description The MM78C30 MM88C30 is a dual differential line driver that also performs the dual four-input NAND or dual four-input AND function The absence of a clamp diode to VCC in the input protection circuitry of the MM78C30 MM88C30 allows a CMOS user to interface systems operating at different voltage levels Thus a CMOS digital signal source can operate at a VCC voltage greater than the VCC voltage of the MM78C30 line driver The differential output of the MM78C30 MM88C30 eliminates ground-loop errors The MM78C29 MM88C29 is a non-inverting single-wire transmission line driver Since [ ... ]

MM88C30N PDF Datasheet Download