US Patent 7317338 Data input buffer in semiconductor device

The present invention provides an input buffer for use in a semiconductor device reducing a current consumption and maintaining a reliable operation speed by detecting a level of the reference voltage. The input buffer includes a comparator, having a first biasing device controlled by a buffer enable signal, for sensing a logic level of an input data by comparing voltage levels of a reference voltage and the input data, a reference voltage detector for detecting the level of the reference voltage, and a second biasing device controlled by an output signal from the reference voltage detector and parallel connected to the first biasing device.