公开(公告)号：US06839286B2

公开(公告)日：2005-01-04

申请号：US10353990

申请日：2003-01-30

申请人： Uk-Rae Cho ,  Tae-Hyoung Kim ,  Jeong-Suk Yang

发明人： Uk-Rae Cho ,  Tae-Hyoung Kim ,  Jeong-Suk Yang

IPC分类号： G11C7/10 ,  G11C16/06 ,  G11C11/34

CPC分类号： G11C29/028 ,  G11C16/06 ,  G11C2029/5002

摘要： An output impedance control circuit of a semiconductor device. A first transistor is connected to a pad and a level controller controls a gate voltage of the first transistor in response to a voltage of the pad and a reference voltage. A MOS array is connected between the pad and a power supply voltage and supplies current to the pad in response to an impedance control code. A first control circuit generates the impedance control code in response to whether a voltage of the pad is converging to the reference voltage. A second control circuit controls a pull-up impedance of the output buffer circuit in response to the first impedance control code when a voltage of the pad is converging to the reference voltage.