The ls on the board is a low power Schottky logic chip electronic component.
Logic chip, also known as programmable logic device, is produced as a general integrated circuit, and its logic function is determined according to the user's device programming.
Computing chip, also known as logic circuit, is a discrete signal transmission and processing, binary as the principle, the realization of digital signal logic operations and operations of the circuit, they are widely used in computers, digital control, communication, automation and instrumentation.