Semiconductor device and semiconductor system

A semiconductor system comprising:

• a first semiconductor device configured to output a command signal;
• and
• a second semiconductor device configured to include a first operation circuit comprising a first MOS transistor and a second operation circuit comprising a second MOS transistor,
• wherein the first MOS transistor and the second MOS transistor are turned on in response to a first internal command signal when a first operation is executed according to the command signal, and the first MOS transistor is turned on in response to a period signal generated when a second operation is executed according to the command signal.

A semiconductor device comprising:

• an operation pulse selection unit configured to transmit a first internal command signal generated by decoding a command signal to a first operation pulse when the first operation is executed and a period signal generated by decoding the command signal to the first operation pulse when the second operation is executed;
• and
• an operation circuit configured to include a MOS transistor,
• wherein the MOS transistor is turned on in response to the operation pulse.