Patent ID: 7868650

Claim:
A termination control circuit for a global input/output line, comprising: a speed determination unit configured to output a termination enable signal which is activated in response to a frequency of an external clock signal and CAS (Column Access Strobe) latency information having at least 1 bit; and a pulse generation unit configured to output a driving signal for turning on or off a termination circuit for the global input/output line in response to a termination control signal and the termination enable signal, wherein the speed determination unit includes: a frequency detection portion configured to detect the frequency of the external clock signal and output a frequency detection signal having at least 1 bit in response to the detection: and a comparison portion configured to receive the frequency detection signal and the CAS latency information and output the termination enable signal in response to the receipt of the frequency detection signal and the CAS latency information, and wherein at least one bit of the frequency detection signal indicates whether the external clock signal has a corresponding frequency or not.