CALIBRATION CIRCUIT OF ON-DIE TERMINATION DEVICE

摘要

A calibration circuit of an on-die termination device includes a code generating unit configured to receive a voltage of a calibration node connected to an external resistor and a reference voltage to generate pull-up calibration codes. The calibration circuit also includes a pull-up calibration resistor unit configured to pull up the calibration node in response to the pull-up calibration codes. The pull-up calibration resistor unit is calibrated such that its resistance becomes higher as a power supply voltage increases.