SBD BUFFER HAVING SELF TEST CIRCUIT WITH INPUT SIGNAL GENERATING FUNCTION AND SELF TEST METHOD OF THE SAME

摘要

PURPOSE: An SBD(Simultaneous Bi-Directional) buffer having a self test circuit with an input signal generating function and a self test method of the SBD buffer are provided to improve the performance test accuracy of the SBD buffer by generating an input signal on performing a self test. CONSTITUTION: An output driver(120) receives an output data and outputs it to an input/output node. An input receiver(140) receives input data and output data which are combined from the input/output node, and compares the signal with a predetermined reference voltage to output it. A first multiplexer(130) outputs the predetermined voltage in response to a reference voltage selecting signal. An input signal generating circuit(110) generates an input signal for a test in a test mode to output it as the input data.