Main amplifier and semiconductor device

A semiconductor device comprising:

• a plurality of memory banks each including a plurality of cell matrixes and a plurality of sense amplifier arrays;
• a plurality of local input/output line pre-charge units for pre-charging a plurality of pairs of local input/output lines of the plurality of memory banks;
• and
• a plurality of main amplifiers for amplifying data signals from respective pairs of local input/output lines and outputting the amplified data signals to a plurality of global input/output lines,
• wherein each of the plurality of main amplifiers comprises:
• a main amplifier pre-charge unit for pre-charging the main amplifier in response to inputted pre-charge control signals;
• an input/output sense amplifier enabled by enable signals for sensing a first data signal transmitted from respective pairs of input/output lines of respective memory banks, amplifying the sensed first data signal, and outputting the amplified first data signal as a second data signal of a first potential level;
• and
• an input/output driver for full-down or full-up driving respective global input/output lines in response to the second data signal from the input/output sense amplifier, and
• wherein the main amplifier is connected in common to a plurality of pairs of local input/output lines for taking charge of a plurality of memory banks.