Semiconductor memory and system

1. A semiconductor memory comprising:

a word line coupled to memory cells and configured to transmit a word line signal;

at least one word repeater circuit including a first load circuit that is disposed on the word line;

a first dummy word line disposed along the word line and configured to transmit a first dummy word line signal;

at least one dummy repeater circuit including a second load circuit that is disposed on the first dummy word line;

bit lines coupled to the memory cells;

column switches configured to couple the bit lines to data lines, respectively;

a column selection line disposed along the word line and configured to transmit a column selection signal for controlling each column switch; and

at least one column repeater circuit disposed on the column selection line and configured to output the column selection signal in synchronization with the first dummy word line signal input to the first dummy repeater circuit.

2. The semiconductor memory according to claim 1 , wherein the first load circuit reduces a voltage of the word line.

3. The semiconductor memory according to claim 1 , wherein the second load circuit has a configuration that is substantially the same as a configuration of the first load circuit.

4. The semiconductor memory according to claim 1 , wherein the first dummy repeater circuit and the column repeater circuit are disposed at substantially the same pitch as the word repeater circuit, and

wherein the column repeater circuit is further configured to output the received column selection signal in synchronization with the first dummy word line signal input to the corresponding first dummy repeater circuit.

5. The semiconductor memory according to claim 1 , wherein each column switch includes a read switch that is turned on when the column selection signal is active.

6. The semiconductor memory according to claim 5 , further comprising:

a write enable signal line disposed along the word line and configured to transmit a write enable signal; and

at least one write repeater circuit disposed on the write enable signal line and configured to output the write enable signal in synchronization with the first dummy word line signal input to the first dummy repeater circuit,

wherein each column switch includes a write switch that is configured to turn on when the column selection signal and the write enable signal are active.

7. The semiconductor memory according to claim 1 , wherein the word repeater circuit and the first dummy repeater circuit include a circuit having substantially the same configuration as the column repeater circuit and a third load circuit having substantially the same configuration as the first load circuit.

8. The semiconductor memory according to claim 7 , wherein the column repeater circuit includes:

an input circuit configured to put an output into a floating state in response to the activated first dummy word line signal and the deactivated column selection signal; and

a half keeper circuit configured to hold the output at a certain level when the output changes to the floating state.

9. The semiconductor memory according to claim 7 , wherein the column repeater circuit includes:

an input circuit configured to put an output into a floating state in response to the activated first dummy word line signal and the deactivated column selection signal; and

a full keeper circuit configured to maintain the output at a certain level when the output changes to the floating state.

10. The semiconductor memory according to claim 1 , further comprising:

a second dummy word line disposed along the word line and configured to transmit a second dummy word line signal;

at least one second dummy repeater circuit including a third load circuit that is disposed on the second dummy word line;

sense amplifiers coupled to the data lines;

a sense amplifier enable signal line disposed along the word line and configured to transmit a sense amplifier enable signal for controlling each sense amplifier; and

at least one sense repeater circuit disposed on the sense amplifier enable signal line and configured to output the sense amplifier enable signal in synchronization with the second dummy word line signal input to the second dummy repeater circuit.

11. The semiconductor memory according to claim 10 , wherein the second dummy repeater circuit and the sense repeater circuit are disposed at substantially the same pitch as the word repeater circuit, and

wherein the sense repeater circuit is further configured to output the sense amplifier enable signal in synchronization with the second dummy word line signal input to the corresponding second dummy repeater circuit.

12. The semiconductor memory according to claim 1 , further comprising:

a third dummy word line disposed along the word line and configured to transmit a third dummy word line signal;

at least one third dummy repeater circuit including a fourth load circuit that is disposed on the third dummy word line;

data precharge circuits coupled to the data lines, respectively;

a precharge signal line disposed along the word line and configured to transmit a precharge signal for controlling each data precharge circuit; and

at least one precharge repeater circuit disposed on the precharge signal line and configured to output the precharge signal in synchronization with the third dummy word line signal input to the third dummy repeater circuit.

13. The semiconductor memory according to claim 12 , wherein the third dummy repeater circuit and the precharge repeater circuit are disposed at substantially the same pitch as the word repeater circuit, and

wherein the precharge repeater circuit is further configured to output the precharge signal in synchronization with the third dummy word line signal input to the corresponding third dummy repeater circuit.

14. The semiconductor memory according to claim 1 , further comprising bit precharge circuits coupled to the bit lines and configured to operate in response to column selection signals output from the column repeater circuits.

15. The semiconductor memory according to claim 1 , wherein the load circuit includes a n-type metal oxide semiconductor transistor disposed between the word line and a ground line and having a gate coupled to the word line.

16. A system comprising:

a semiconductor memory; and

a controller configured to access the semiconductor memory,

wherein the semiconductor memory includes:

a word line coupled to memory cells and configured to transmit a word line signal;

at least one word repeater circuit including a first load circuit that is disposed on the word line;

a first dummy word line disposed along the word line and configured to transmit a first dummy word line signal;

at least one dummy repeater circuit including a second load circuit that is disposed on the first dummy word line;

bit lines coupled to the memory cells;

column switches configured to couple the bit lines to data lines, respectively;

a column selection line disposed along the word line and configured to transmit a column selection signal for controlling each column switch; and

at least one column repeater circuit disposed on the column selection line and configured to output the column selection signal in synchronization with the first dummy word line signal input to the first dummy repeater circuit.