Patent ID: 6448110
Filing Date: 2002-09-10
Classification: H01L

Abstract:
A method for forming a back-to-back dual-memory chip package to double its memory capacity comprising the steps of:providing a first memory chip having a first plurality of conductive elements formed on a top surface a first plurality of solder balls on said first plurality of conductive elements, providing a lead frame having a first plurality of lead fingers emanating therefrom, bonding said first plurality of solder balls to free ends of said first plurality of lead fingers, providing a second memory chip that is identical to said first memory chip, bonding a bottom surface of said first memory chip to a bottom surface of said second memory chip by adhesive means, and encapsulating said first and second memory chips in an insulating material with said first memory chip facing upwardly and said second memory chip facing downwardly such that said first plurality of solder balls and said free ends of said first plurality of lead fingers are substantially covered by said insulating material while a second plurality of solder balls on said second memory chip is substantially exposed.