| 摘要 |
An area array type semiconductor device employing a single side wiring board in which a signal waveform is not likely to be disturbed even if a higher speed signal is applied includes more ground pads than the number of ground external terminals (ground wire land). The ground wire is formed in a larger width than the other wires on a single side of a substrate so as to form a plane, and gaps between the ground wire and the signal wire or the power wire are set to be substantially equal. |
