During the final stages of semiconductor development, a tiny block of materials (the silicon wafer, logic, and memory) is wrapped in a supporting case that prevents physical damage and corrosion and allows the chip to be connected to a circuit board. Typical packaging configurations have included the leadless chip carriers and pin-grid arrays of the 1980s, the system-in-package and package-on package setups of the 2000s, and, most recently, 2-D integrated-circuit technologies such as wafer-level 更多
