Data receiver of semiconductor integrated circuit

A data receiver of a semiconductor integrated circuit, the data receiver comprising:

• a plurality of receiver units, each of the plurality of receiver units including:
• a plurality of level detectors, each of the plurality of level detectors configured to detect different signal levels and receive data according to a clock signal having a predetermined phase difference and perform an amplification operation including an equalization function based on feedback data, thereby outputting an amplification signal;
• and
• an encoder configured to receive the output signals of the plurality of level detectors, wherein level detectors of one receiver unit are configured to receive an amplification signal, as the feedback data, from level detectors of another receiver unit that receives a first clock signal having a phase more advanced than a phase of a second clock signal received in the one receiver unit,
• wherein the plurality of level detectors include:
• a high-level detector configured to amplify the data based on a first reference voltage having been adjusted through the equalization function to output a first amplification signal;
• a mid-level detector configured to amplify the data based on a second reference voltage having been adjusted through the equalization function to output a second amplification signal;
• and
• a low-level detector configured to amplify the data based on a third reference voltage having been adjusted through the equalization function to output a third amplification signal, and
• wherein the high-level detector includes:
• a cross coupled latch circuit configured to receive the data through a differential input terminal including first and second switching elements to output the first amplification signal;
• and
• an adjustment circuit configured to control levels of output terminals of the first and second switching elements to set the first reference voltage, and adjust turn-on levels of the first and second switching elements according to the feedback data to adjust an offset of the first reference voltage.