| 摘要 |
PROBLEM TO BE SOLVED: To perform an operation of impedance adjustment by a calibration circuit more successfully. ! SOLUTION: A semiconductor device comprises: a resistive element r2 connected to between a node N2 and a calibration terminal ZQ; a pull-up replica unit RU3 which is connected to the node N2 and in which impedance is controlled depending on an impedance code RPCODE; and a pull-down replica unit RU4 which is connected to the node N2 and fixed to an inactivated state. The impedance code RPCODE is created by a control circuit 111 depending on potential of the calibration terminal ZQ. According to the present embodiment, since the replica unit 101 having a circuit configuration the same with that of an output unit is used, an operation of impedance adjustment by a calibration circuit can be performed more successfully. ! COPYRIGHT: (C)2015,JPO&INPIT |
