| 摘要 |
Semiconductor devices having an interface of an open drain or a pseudo-open drain type are provided, and the semiconductor devices include a data strobe (DQS) control signal generating circuit, a DQS control circuit and an output unit. The generating circuit generates a first DQS control signal and a second DQS control signal, and the control circuit controls a data strobe signal by sequentially changing a state of a following section next to a postamble section of the data strobe signal in response to a clock signal; the first and second DQS control signals, from a first logical state of the postamble section to a second logical state, and then from the second logical state to a high impedance state after a first predetermined time. Operations at a high frequency may be possible by controlling a data strobe signal. Related controlling methods are provided.
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