POWER DOWN MODE CONTROL APPARATUS AND DLL CIRCUIT WITH THE SAME

摘要

A power down mode control apparatus and a DLL circuit with the same is provided to reduce noise in the power down mode, so realizing the stable power-down mode. In a power down mode control apparatus(90), an internal power control(902) receive a locking signal and an internal power down signal for toggling it for a certain time. A noise monitoring unit(904) checks noise generation from a phase sensing signal and generates a plurality of power down selection signals in response to the locking signal and the internal power down signal. A power down entry control unit(906) controls the respective circuit to enter the power down mode in response to a reference clock, a plurality of power down selection signals, power down mode signal and internal power down signal.