Patent attributes
Disclosed is an on-die termination (‘ODT’) impedance calibration device. The ODT impedance calibration device comprises: a pulse generator for outputting a calibration signal of a pulse type for calibrating an ODT impedance; an M-bit counter for counting the number of pulses of the calibration signal; a first maximum counter trigger signal generator controlled by the M-bit counter; an N-bit counter for counting the number of pulses of the calibration signal; a second maximum counter trigger signal generator controlled by the N-bit counter; a delay unit for receiving a delay signal and outputting the delay signal after a predetermined period of time; an update trigger signal generator for outputting a pulse signal which is toggled according to an output signal of the delay unit; and an ODT impedance calibration unit for receiving the calibration signal and outputting a control signal for calibrating an ODT impedance.
