Patent ID: 7560963

Claim:
A delay-locked loop device comprising: a rising clock delay-locked circuit which performs a delay and locking operation for generating a rising clock using a first clock inputted as a reference and using a second clock in which the second clock is replica delayed from the first clock, and if a phase difference between the first and second clocks is greater than a predetermined range then the rising clock delay-locking circuit performs the delay and locking operation wherein a dual coarse delay line corrects the first clock such that the phase difference between the first and second clocks is within the predetermined range; a falling clock delay-locked circuit which performs a delay and locking operation for generating a falling clock using the first clock after the delay and locking operation for generating the rising clock is completed; a control circuit which controls the rising clock delay-locked circuit and controls the falling clock delay-locked circuit by sequentially controlling the delay and locking operations for generating the rising clock and the falling clock; and a duty cycle correction circuit which performs a duty cycle correction operation for generating an output clock from the delayed-locked rising clock and the delay-locked falling clock respectively outputted from the rising clock delay-locked circuit and from the falling clock delay-locked circuit such that the outputted clocks are respectively inputted into the duty cycle correction circuit for generating the output clock, wherein the control circuit comprises: a first control portion configured to control a delay and locking operation for the rising clock using a first detection signal generated by comparing the first and the second clock phases; a second control portion configured to control a delay and locking operation for the falling clock using a second detection signal generated by comparing the delay and locking completed rising clock and the failing clock phases; and a loop selector portion configured to select any one of the first and the second control portions using the second detection signal.