Semiconductor memory device and method of driving the same

PURPOSE: A semiconductor memory device and a driving method thereof are provided to safely prevent a write post-amble ringing of a data strobe signal by applying a data strobe signal counting method in the entry of a dynamic on die termination mode. CONSTITUTION: A signal processing unit(180) generates a control signal corresponding to burst length information in a dynamic on die termination mode. An output control unit(190) controls the output of a data strobe signal in response to the control signal. A monitoring unit(170) monitors a space between column commands. [Reference numerals] (110) Address input unit; (120) Command input unit; (130) ODT mode entry signal input unit; (140) Clock input unit; (150) Mode register set; (160) Command decoder; (170) Monitoring unit; (180) Signal processing unit; (190) Output control unit