Power-up signal generation circuit and semiconductor device including the same

A semiconductor device comprising:

• a first power pad configured to receive a first power supply voltage with a first target level;
• a second power pad configured to receive a second power supply voltage with a second target level that is higher than the first target level;
• a first power-up signal generation circuit configured to operate by using the first power supply voltage received through the first power pad, and generate a first power-up signal that is activated when the first power supply voltage becomes higher than a first level and the second power supply voltage received through the second power pad becomes higher than a second level;
• a second power-up signal generation circuit configured to generate a second power-up signal by shifting a level of the first power-up signal, and deactivate the second power-up signal when the second power supply voltage is lower than the second level;
• and
• an internal circuit configured to operate by using the first power supply voltage and the second power supply voltage, and be initialized based on the first power-up signal and the second power-up signal,
• wherein the second power-up signal generation circuit includes:
• a level shifting block configured to pull-down drive a first node when the first power-up signal is not in an activated state, and pull-up drive the first node with the second power supply voltage when the first power-up signal is in the activated state;
• an additional driving block configured to pull-down drive the first node in response to a second pre-power-up signal, and retain, when the second power supply voltage is applied earlier than the first power supply voltage, a voltage level of the first node after the second pre-power-up signal is activated until the first power-up signal is activated;
• and
• a power-up signal driving block configured to operate by using the second power supply voltage, and generate the power-up signal through a second node by driving the second node based on a voltage level of the first node.