Semiconductor device employing DVFS function

A semiconductor device comprising:

• a plurality of input terminals;
• a command decoder coupled to ones of the input terminals and configured to generate a mode register set signal in response to signals supplied with the ones of the input terminals;
• a mode register coupled to the command decoder, the mode register being configured to store mode data in response to the mode register set signal;
• and
• an internal voltage generation circuit configured to generate an internal voltage and determine a level of the internal voltage in response to the mode data, wherein the internal voltage generation circuit is configured to generate an additional voltage and fix a level of the additional voltage regardless of the mode data.

A semiconductor device comprising:

• a plurality of input terminals;
• a command decoder coupled to ones of the input terminals and configured to generate a mode register set signal in response to signals supplied with the ones of the input terminals;
• a mode register coupled to the command decoder, the mode register being configured to store mode data in response to the mode register set signal;
• and
• an internal voltage generation circuit configured to generate an internal voltage and determine a level of the internal voltage in response to the mode data, wherein the internal voltage generation circuit includes:
• a reference voltage generating circuit configured to generate a plurality of reference voltages;
• a selection circuit supplied with the reference voltages, the selection circuit being configured to select one of the reference voltages in response to the mode data;
• and
• a drive circuit configured to generate the internal voltage in response to the one of the reference voltage.