Nonvolatile memory device including a peripheral circuit to receive an address in synch with one of a rising and falling edge of a signal regardless of whether a first or second alignment type is selected and nonvolatile memory system including the same

A flash memory device including: a memory cell array; a signal generator inputting a first data fetch signal and outputting a second data fetch signal; and an output buffer circuit configured to output data from the memory cell array in sync with rising and falling edges of the second data fetch signal, wherein second data fetch signal is output along with data output from the output buffer circuit.