Abstract: A stack package having a plurality of stacked chips includes first voltage dropping units respectively formed in the plurality of chips, the first voltage dropping units are electrically coupled by a first line; second voltage dropping units respectively formed in the plurality of chips, the second dropping units are electrically coupled by a second line; first signal generation units respectively formed in the plurality of chips, each of the first signal generation units is connected to an output node of the first voltage dropping units, respectively; and second signal generation units respectively formed in the plurality of chips, each of the second signal generation units is connected to an input node of the second voltage dropping units, respectively.

Abstract: A stack package having stacked chips includes first voltage dropping units respectively formed in the chips; second voltage dropping units respectively formed in the chips; first signal generation units connected in parallel to a first line formed by connecting the first voltage dropping units in series, respectively formed in the chips, and configured to apply high level signals according to a voltage of the first line; second signal generation units connected in parallel to a second line formed by connecting in series the second voltage dropping units, respectively formed in the chips, and configured to apply high level signals according to a voltage of the second line; and chip selection signal generation units respectively formed in the chips, and configured to combine signals outputted from the first signal generation units and the second signal generation units and generate chip selection signals.