Semiconductor apparatus and chip selection method thereof

1. A semiconductor apparatus having a plurality of chips, comprising:

a through silicon via (TSV) configured to couple the plurality of chips together and configured to be coupled in series to a plurality of voltage drop units, wherein each of the plurality of voltage drop units is included in a corresponding one of the plurality of chips;

a plurality of signal conversion units, each of which is disposed in the corresponding one of the plurality of chips and configured to convert a voltage outputted from the voltage drop unit of the corresponding one of the plurality of chips to a digital code signal and provide the digital code signal as a chip identification signal of the corresponding one of the plurality of chips; and

a plurality of chip selection signal generating units, each of which is disposed in the corresponding one of the plurality of chips and configured to compare the chip identification signal with a chip selection identification signal to generate a chip selection signal of the corresponding one of the plurality of chips.

2. The semiconductor apparatus of claim 1 , wherein each of the voltage drop units is configured to include a resistance element.

3. The semiconductor apparatus of claim 1 , wherein each of the plurality of signal conversion units includes an analog-to-digital converter (ADC) configured to receive the voltage outputted from the voltage drop unit to generate the chip identification signal.

4. The semiconductor apparatus of claim 1 , wherein each of the plurality of chip selection signal generating units is configured to enable the chip selection signal if the chip identification signal matches the chip selection identification signal.

5. The semiconductor apparatus of claim 1 , wherein the semiconductor apparatus further includes a plurality of latch units,

wherein each of the plurality of latch units is disposed in the corresponding one of the plurality of chips and latch the chip identification signal.

6. The semiconductor apparatus of claim 1 , wherein the chip selection identification signal is a command signal inputted from outside of the semiconductor apparatus.

7. The semiconductor apparatus of claim 1 , wherein the chip selection identification signal is transmitted to each of the plurality of chip selection signal generating units via another TSV.

8. A chip selection method for a semiconductor apparatus having a plurality of chips, comprising:

applying an input voltage from a through silicon via (TSV) to a series coupled voltage drop unit of a corresponding one of the plurality of chips;

outputting an output voltage from the series coupled voltage drop unit to a signal conversion unit of the corresponding one of the plurality of chips;

converting the output voltage to a digital code; and

assigning a chip identifier to the corresponding one of the plurality of chips based upon the digital code; and

comparing the chip identifier with a chip selection identifier to generate a chip selection signal of the corresponding one of the plurality of chips.

9. The chip selection method of claim 8 , comprising:

storing the chip identifier.

10. The chip selection method of claim 8 , wherein the chip selection identifier is a command inputted from outside of the semiconductor apparatus.

11. The chip selection method of claim 8 , wherein the chip selection identifier is transferred to each of the plurality of chips via another TSV.