Semiconductor device and system for switching between high-voltage and low-voltage operation circuits

1. A semiconductor device comprising:

a first input circuit to which a first supply voltage is supplied;

a second input circuit to which a second supply voltage that is lower than the first supply voltage is supplied; and

a control circuit configured to activate the first input circuit in a first mode and configured to activate the second input circuit in a second mode,

wherein the control circuit controls the first input circuit and the second input circuit such that the first input circuit and the second input circuit are activated during a certain time period when switching between the first mode and the second mode, and a supply of a first control signal indicating activation of the first input circuit by the control circuit overlaps at least partially with a supply of a second control signal indicating activation of the second input circuit by the control circuit.

2. The semiconductor device according to claim 1 , wherein

a first control signal which is generated by the control circuit and controls the first input circuit and a second control signal which is generated by the control circuit and controls the second input circuit are independent of each other.

3. The semiconductor device according to claim 1 , further comprising:

a register configured to construct the control circuit to activate the first input circuit or the second input circuit.

4. The semiconductor device according to claim 3 , wherein

the register instructs the control circuit to activate the first input circuit or the second input circuit based on a command signal supplied from an outside source.

5. The semiconductor device according to claim 1 , wherein

the second input circuit includes a level conversion circuit configured to convert a level of an input signal to a level corresponding to the first supply voltage.

6. The semiconductor device according to claim 1 , further comprising:

a synthesis circuit configured to synthesize an output from the first input circuit and an output from the second input circuit.

7. The semiconductor device according to claim 1 , wherein

the first input circuit and the second input circuit receive a command signal or a address signal.

8. A semiconductor device, comprising:

an internal circuit;

a first input circuit; and

a second input circuit,

wherein the first input circuit and the second input circuit are activated during a certain time period when switching between a first signal and a second signal, and

wherein an input signal is supplied to the internal circuit via one of the first input circuit and the second input circuit, the first input circuit operates at a first supply voltage and the second input circuit operates at a second input voltage which is lower than the first input voltage, and the first input circuit and the second input circuit are at least part of one of a synchronous interface circuit and an asynchronous interface circuit.

9. The semiconductor device according to claim 8 , wherein

a first time period where a first control signal which controls the first input circuit has a first level which instructs activation of the first input circuit and a second time period where a second control signal which controls the second input circuit has a second level which instructs activation of the second input circuit overlap at least partially.

10. The semiconductor device according to claim 8 , wherein

the first input circuit or the second input circuit is controlled based on a command signal supplied from an outside source.

11. A system comprising:

a controller; and

a semiconductor device which is controlled based on a control signal from the controller, wherein

the semiconductor device includes:

a first input circuit to which a first supply voltage is supplied;

a second input circuit to which a second supply voltage that is lower than the first supply voltage is supplied; and

a control circuit configured to activate the first input circuit in a first mode and configured to activate the second input circuit in a second mode,

wherein the control circuit controls the first input circuit and the second input circuit such that the first input circuit and the second input circuit are activated during a certain time period when switching between the first mode and the second mode, and a supply of a first control signal indicating activation of the first input circuit by the control circuit overlaps at least partially with a supply of a second control signal indicating activation of the second input circuit by the control circuit.

12. The system according to claim 11 , wherein

the control circuit generates a first control signal which instructs activation of the first input circuit and a second control signal which instructs activation of the second input circuit based on the control signal.

13. The system according to claim 11 , wherein

the control circuit supplies a first control signal, which instructs activation of the first input circuit, and a second control signal, which instructs activation of the second input circuit, and supplies the first control signal to the first input circuit and the second control circuit to the second input circuit together during the certain time period.

14. The system according to claim 11 , wherein

the semiconductor device includes a semiconductor memory and the control signal includes a mode register setting command.

15. The system according to claim 11 , wherein

the first input circuit and the second input circuit receive a command signal or a address signal from the controller.

16. The semiconductor device according to claim 1 , wherein

the first input circuit and the second input circuit are at least part of one of a synchronous interface circuit and an asynchronous interface circuit.

17. The system according to claim 11 , wherein

the first input circuit and the second input circuit are at least part of one of a synchronous interface circuit and an asynchronous interface circuit.