Patent ID: 8873265
Filing Date: 2014-10-28
Classification: G11C,H01L,H05K,Y02P

Abstract:
1. A semiconductor device comprising: a substrate; and a plurality of nonvolatile semiconductor memories mounted on the substrate, wherein the substrate includes: a wiring density of the entire third wiring layers and the second wiring layer that are formed on a rear surface layer side with respect to a center line of a layer structure of the substrate, is equal to or greater than a wiring density of the entire third wiring layers and the first wiring layer that are formed on a surface layer side with respect to the center line of the layer structure of the substrate, a difference between the wiring density of the entire third wiring layers and the second wiring layer and the wiring density of the entire third wiring layers and the first wiring layer being 7.5% or less, and at least one of the third wiring layers is a shield layer configured to prevent leakage of noise.