The exposed top face of the IC chip has a plurality of contact areas or pads around the periphery of the chip for connecting {TAIL ~ the input/output leads} of the various circuits within {HEAD ~ the IC chip} to the multilayer circuit board 
The exposed top face of the IC chip has a plurality of contact areas or pads around the periphery of the chip for connecting { TAIL ~ the input / output leads } of the various circuits within { HEAD ~ the IC chip } to the multilayer circuit board
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