Apparatus and method for receiving external data signal to generate internal data signal

An apparatus for receiving an external signal in synchronization with rising and falling edges of a data strobe signal to generate two internal signals in synchronization with one of both edges of a main clock in a high speed memory device, comprising:

• a) a means for comparing a reference voltage signal with the external signal to generate a full-swing level signal;
• b) a first signal generating means for receiving the full-swing level signal and an inverted full-swing level signal to generate a first signal in synchronization with a first strobe signal, wherein the first strobe signal is synchronized with one edge of the data strobe signal;
• c) a second signal generating means for receiving the full-swing level signal and the inverted full-swing level signal to generating a second signal in synchronization with a second strobe signal, wherein the second strobe signal is synchronized with the other edge of the data strobe signal;
• d) a first align means for latching and outputting the first signal in response to the second strobe signal, so that the first and second signals are aligned with a same point of the data strobe signal;
• and
• e) a second align means for latching the output signal of the first align means and the second signal to generate two internal signals in synchronization with a third strobe signal, wherein the third strobe signal is a signal synchronized with one edge of the main clock,
• whereby the output signals of the second align means are aligned with the main clock.