Patent ID: 6576992
Filing Date: 2003-06-10
Classification: H01L,H05K

Abstract:
A high-density circuit module comprising:a first flex circuit having first and second conductive layers between which conductive layers is an intermediate layer, the first and second conductive layers being interior to first and second outer layers of the first flex circuit, the second conductive layer having upper and lower flex contacts, the upper flex contacts being accessible through second CSP windows through the second outer layer and the lower flex contacts being accessible through first CSP windows through the first outer layer, the first conductive layer and the intermediate layer, the lower flex contacts being further accessible through module contact windows through the second outer layer; a second flex circuit having first and second conductive layers between which conductive layers is an intermediate layer, the first and second conductive layers being interior to first and second outer layers of the second flex circuit, the second conductive layer having upper and lower flex contacts, the upper flex contacts being accessible through second CSP windows through the second outer layer and the lower flex contacts being accessible through first CSP windows through the first outer layer and the first conductive layer and the intermediate layer, the lower flex contacts being further accessible through module contact windows through the second outer layer; a first CSP having first and second lateral sides and upper and lower major surfaces with CSP contacts along the lower major surface, the CSP contacts of the first CSP passing through the first CSP windows of the first and second flex circuits to contact the lower flex contacts of the first and second flex circuits; a second CSP having first and second lateral sides and upper and lower major surfaces with CSP contacts along the lower major surface, the CSP contacts of the second CSP passing through the second CSP windows of the first and second flex circuits to contact the upper flex contacts of the first and second flex circuits, the first and second flex circuits being disposed about the first and second lateral sides, respectively, of the first CSP to place the upper flex contacts of the first and second flex circuits between the first and second CSPs; and a set of module contacts passing through the module contact windows to contact the lower flex contacts of the first and second flex circuits.