Input and output device and system including the same

1. An input and output (I/O) device, comprising:

a driving unit coupled between a first voltage and a second voltage, and configured to receive a first signal to drive a second signal to swing with a second swing range narrower than a first swing range where the first swing range is between the first voltage and the second voltage, and the driving unit is configured to supply the second signal to a transmission line, the driving unit including a first stabilizer coupled between the first voltage and the transmission line and a second stabilizer coupled between the second voltage and the transmission line; and

a receiver coupled between the first voltage and the second voltage, and configured to receive the second signal through the transmission line to output a third signal, the receiver including a third stabilizer coupled between the first voltage and the transmission line and a fourth stabilizer coupled between the second voltage and the transmission line,

wherein the receiver matches a middle point of the third signal and that of the second signal by adjusting the third signal to swing the second swing range.

2. The I/O device according to claim 1 , wherein the first stabilizer and the third stabilizer are voltage lowering elements with the same structure, and the second stabilizer and the fourth stabilizer are voltage lowering elements with the same structure.

3. The I/O device according to claim 1 , wherein the driving unit comprises:

a pull-up unit including the first stabilizer and configured to drive the first signal to a high level; and

a pull-down unit including the second stabilizer and configured to drive the first signal to a low level.

4. The I/O device according to claim 3 , wherein the pull-up unit comprises a pull-up transistor coupled between the first stabilizer and the transmission line, and

the pull-down unit comprises a pull-down transistor coupled between the second stabilizer and the transmission line.

5. The I/O device according to claim 4 , wherein the first stabilizer is a first diode-connected transistor coupled serially between the first voltage and the pull-up transistor, and

the second stabilizer is a second diode-connected transistor coupled serially between the second voltage and the pull-down transistor.

6. The I/O device according to claim 5 , wherein a maximum point of the second swing range is less than the first voltage by a threshold voltage of the first diode-connected transistor, and a minimum point of the second swing range is greater than the second voltage by a threshold voltage of the second diode-connected transistor.

7. The I/O device according to claim 3 , further comprising a pre-driver unit configured to supply a pull-up driving signal to the pull-up transistor in response to the first signal, based on a third voltage lower than the second voltage, or

to supply a pull-down driving signal to the pull-down transistor in response to the first signal, based on a fourth voltage higher than the first voltage.

8. The I/O device according to claim 1 , further comprising a level shifter configured to receive the third signal from the receiver so as to move a voltage to fall within the first swing range.

9. The I/O device according to claim 1 , wherein the transmission line includes at least one selected from a resistance component and a capacitance component.

10. An I/O system, comprising:

a driving unit configured to receive a data signal that falls within a first swing range, narrow the first swing range by including voltage lowering elements, and supply a transmission data signal that falls within a second swing range through a transmission line;

a receiver configured to receive the transmission data signal as a reception data signal, adjust a swing range so that the reception data signal has the same second swing range as that of the transmission data signal, and match a middle point of the reception data signal and that of the data signal;

a level shifter configured to adjust a voltage level so that the second swing range has the first swing range so as to supply a data output signal; and

a final driving circuit configured to receive a data output signal having the adjusted voltage level.

11. The I/O system of claim 10 , wherein the driving unit is coupled between the first voltage and the second voltage, and includes a first stabilizer coupled between the first voltage and the transmission line and a second stabilizer coupled between the second voltage and the transmission line, the first and second stabilizers being included in the voltage lowering elements, and

the receiver is coupled between the first voltage and the second voltage, and includes a third stabilizer coupled between the first voltage and the transmission line and a fourth stabilizer coupled between the second voltage and the transmission line.

12. The I/O system of claim 11 , wherein the first to fourth stabilizer have substantially the same structure.