Patent ID: 6599764
Filing Date: 2003-07-29
Classification: G01R,H01L

Abstract:
A method for isolating a die in testing a multi-die package having a first die and a second die, the first die having a VCC input, and the second die having a supply voltage (VCC) input, an I/O supply voltage (VCCIO) input, and at least one input/output (I/O) pin connected to an I/O buffer having a driver and a pre-driver, said method comprising:disposing the multi-die package in a test platform, wherein said test platform includes a first lead and a second lead; connecting said first lead to the VCC input on the first die; connecting said second lead to the VCCIO input on the second die; connecting the VCC input on the second die to ground; and tri-stating the I/O pin of the second die using a control circuit disposed between the pre-driver and the driver of the I/O buffer.