DELAY CIRCUIT AND SEMICONDUCTOR DEVICE COMPRISING THE SAME

摘要

A delay circuit and a semiconductor device comprising the same are provided to delay an input signal through selected variable delay units only, by maintaining a minimum delay time constantly even though the number of the variable delay units increases. A plurality of variable delay units(21-2n) is connected serially. A driving unit(30) generates an output signal by assembling signals transmitted from the plurality of variable delay units. Each variable delay unit delays an output signal of a previous stage and then transmits the delayed output signal to a variable delay unit in a next stage when delay operation is enabled according to a control signal, and transmits the output signal of the previous stage to the driving part if the delay operation is disabled.