Patent ID: 7737719
Filing Date: 2010-06-15
Classification: H03K

Abstract:
1. An apparatus for adjusting a resistance value of a driver of a semiconductor integrated circuit in which the resistance value of the driver is adjusted according to a code signal, the apparatus comprising: a control means that generates a plurality of counting mode signals such that a unit of counting is changed in a predetermined period; a counting means that counts the code signal in the unit of counting that is changed in response to the plurality of counting mode signals, according to a count up/down signal; and a comparing means that compares a voltage obtained by converting the code signal with a reference voltage to generate the count up/down signal, wherein the control means generates the plurality of counting mode signals such that the counting unit performs 8-unit counting, 4-unit counting, and 2-unit counting during a predetermined period for the overall time required to adjust the resistance value of the driver, and repeats one-unit counting in the other period.