SEMICONDUCTOR DEVICE AND SEMICONDUCTOR SYSTEM EQUIPPED WITH THE SAME

摘要

PROBLEM TO BE SOLVED: To perform a calibration operation with less error.SOLUTION: A semiconductor device comprises: a plurality of pull-down units PDR1-PDR5 which are connected in parallel with each other between a calibration terminal ZQ and power supply wiring SL; a pull-up unit PUR and a pull-down unit PDR0 connected in series between the power supply wiring SL and power supply wiring VL. The pull-down units PDR0-PDR5 each includes a transistor part TRD and a high resistance wiring part RW, which are formed to be capable of adjusting impedance depending on a code signal CODEPD. A resistance value of the high resistance wiring part RW of each of the pull-down units PDR1-PDR5 and a resistance value of the high resistance wiring part RW of the pull-down unit PDR0 are different from each other. According to the present embodiment, a calibration operation with less error can be performed even when a reference level is off set from 1/2 of power supply potential.