Patent ID: 9413565
Filing Date: 2016-08-09
CPC Classification: H03K,H04L

Claim Text:
1. An interface circuit comprising: a termination resistor coupled between a reception pad and a termination node; and a termination voltage generation circuit configured to detect a voltage level of the termination node, and drive the termination node to a level of a termination voltage when the voltage level of the termination node deviates from a predetermined range, wherein the termination voltage generation circuit comprises a first comparator configured to compare the voltage level of the termination node and an up reference voltage, and generate a first comparison signal, a pull-up driver configured to pull-up drive the termination node in response to the first comparison signal, a second comparator configured to compare the voltage level of the termination node and a down reference voltage, and generate a second comparison signal, and a pull-down driver configured to pull-down drive the termination node in response to the second comparison signal, wherein the pull-up driver comprises a first resistor element coupled with a power supply voltage, and a first switching element coupled between the first resistor element and the termination node, and configured to be turned on in response to the first comparison signal, wherein the pull-down driver comprises a second resistor element coupled with a ground voltage, and a second switching element coupled between the second resistor element and the termination node, and configured to be turned on in response to the second comparison signal, wherein an impedance value of the first resistor element is substantially the same as an impedance value of the second resistor element, and the impedance values of the first and second resistor elements are less than the impedance value of the termination resistor.