This part is a kind of semiconductor called 74LS13.
Function of this product has SCHMITT TRIGGERS DUAL GATE/HEX INVERTER.
Manufacturers : Motorola
Image and pinout :
Some of the text within the PDF file :
SCHMITT TRIGGERS DUAL GATE/HEX INVERTER The SN54LS/ 74LS13 and SN54LS / 74LS14 contain logic gates / inverters which accept standard TTL input signals and provide standard TTL output levels. They are capable of transforming slowly changing input signals into sharply defined, jitter-free output signals. Additionally, they have greater noise margin than conventional inverters. Each circuit contains a Schmitt trigger followed by a Darlington level shifter and a phase splitter driving a TTL totem pole output. The Schmitt trigger uses positive feedback to effectively speed-up slow input transitions, and provide different input threshold voltages for positive and negative-going transitions. This hysteresis between the positive-going and negative-going input thresholds (typically 800 mV) is deter [ ... ]
74LS13 PDF Datasheet Download