Japanese semiconductor giants Toshiba Corp. and Renesas Electronics Corp. have temporarily closed facilities because of the quake. The electronics companies that depend on chips from Japan are trying to assess the depth of the supply disruptions. Chip prices have already jumped on fear of shortages. The price of a type of memory chip called NAND flash, commonly used in portable electronics, has surged more than 10 percent since the disaster, analysts say. For consumer electronics, supply chains are complex. Some cell phones have dozens of chips. Apple Inc.'s iPad requires parts from around the world. The insides of the device show how much coordination Apple must have with suppliers around the world to ensure there are enough parts.