US Patent 7549092 Output controller with test unit

There is provided an output controller with a test unit, which can test an appropriate delay amount according to an operating frequency under a real situation. The output controller includes an initial synchronizing unit for outputting a first output enable signal when a read CAS signal is activated; a plurality of synchronizing units connected in series to output an output signal of a previous stage as an output enable signal in synchronization with a corresponding driving clock, a first stage of the synchronizing units receiving the first output enable signal; and a test unit for adjusting a delay amount of an input clock according to a test signal and outputting the driving clock.