Patent ID: 7017092

Claim:
A characteristic monitoring device for an integrated circuit having plural input lines, plural output lines, and plural bidirectional lines and generating an output signal, comprising: a test circuit having plural first input ends coupled to the plural input lines and plural second input lines coupled to the plural bidirectional lines, and an output end; a first select circuit having a first input end, a second input end, a control end, and an output end, wherein the first input end of the first select circuit receives the output signal of the integrated circuit, the control end of the first select circuit receives a first select signal for selecting the first input end or the second input end coupling to the output end, and the output end of the first select circuit is coupled to the output line; and plural characteristic circuits, wherein the characteristic circuit has an input end and an output end, wherein the input end of the characteristic circuit is coupled to the output end of the test circuit, the output end of the characteristic circuit is coupled to the corresponding second input end of the first select circuit.