Circuits for setting reference voltages and semiconductor devices including the same

A semiconductor device comprising:

• a first channel configured to include a first data pad portion receiving first data in a first input mode and in a second input mode and a second data pad portion receiving second data in the first input mode, wherein the first channel is configured to set a level of a first reference voltage according to the first data or the second data;
• and
• a second channel configured to include a third data pad portion receiving the first data in the first and second input modes and a fourth data pad portion receiving the second data in the first input mode, wherein the second channel is configured to set a level of a second reference voltage according to the first data or the second data.