Patent ID: 8093921

Claim:
An apparatus comprising: a test board adapted to couple at least a sub-array of contacts of a functional integrated circuit package to metallic traces on a printed circuit board with a first contact adapted to be coupled to a reference voltage signal at a reference voltage level; a first multiplexer having a plurality of inputs coupled to the sub-array of contacts via metallic traces, an output, and a control input adapted to receive a control signal that controls the first multiplexer to couple a selected input to the output; a voltage comparator circuit having a first input adapted to receive the reference voltage signal, a second input coupled to the output of the first multiplexer and an output adapted to provide a digital representation encoding the amplitude of a voltage level at a contact coupled to the output of the first multiplexer; and a programmable device having a first output coupled to the control input of the first multiplexer, a first input coupled to the output of the voltage comparator circuit, and a second output, with the programmable device configured to output first and second control signals at its first output to control the first multiplexer to sequentially couple second and third contacts to the first input of the voltage comparator circuit and to output a pass signal at the second output if the amplitude of a received voltage level is greater than a threshold voltage level.