Semiconductor device and method of driving the same

A semiconductor device, comprising:

• a number of memory chips;
• a power-up operation unit included in each of the memory chips and configured to perform a power-up operation on an internal circuit included in each of the memory chips in response to a power-up enable signal;
• and
• a power-up detection unit configured to output a power-up flag signal in response to a power-up completion signal outputted from the power-up operation unit,
• wherein the power-up flag signal generated from the power-up detection unit of a first memory chip from among the memory chips is supplied as the power-up enable signal of a next memory chip from among the memory chips.

A semiconductor device, comprising:

• a number of memory chips included in one package and coupled to pins of the package through wires;
• a power-up operation unit included in each of the memory chips and configured to perform a power-up operation on an internal circuit included in each of the memory chips in response to a power-up enable signal;
• and
• a power-up detection unit configured to output a power-up flag signal in response to a power-up completion signal outputted from the power-up operation unit,
• wherein the power-up flag signal generated from the power-up detection unit of a first memory chip from among the memory chips is supplied as the power-up enable signal of a next memory chip from among the memory chips.

A method of operating a semiconductor device comprising a number of memory chips, the method comprising:

• performing a power-up operation on a first memory chip of the memory chips;
• and
• performing the power-up operation on a next memory chip of the memory chips, after the power-up operation is completed,
• wherein the power-up operation is sequentially performed up to a last memory chip of the memory chips.