Apparatuses and methods for providing bias signals according to operation modes as supply voltages vary in a semiconductor device

An apparatus, comprising:

• a bias circuit configured to receive a supply voltage and the bias circuit further configured to provide a bias signal having a magnitude that decreases at a rate to a non-zero minimum magnitude with increasing supply voltage in a first operation mode and to provide the bias signal having a magnitude that decreases at the rate to less than the non-zero minimum magnitude with increasing supply voltage in a second operation mode;
• and
• a buffer circuit configured to receive the bias signal and the supply voltage, and to provide output signals at an output responsive to input data strobe signals provided to an input, the buffer circuit further configured to have a propagation delay from the input to the output that varies with the magnitude of the bias signal.