| 摘要 |
A semicustom integrated circuit comprises pads (12) arranged on peripheral portions of a chip (11) along the four sides thereof. Peripheral circuit cells (13) are arranged on a part of the chip (11) to the inside of the pads (12). An internal circuit (14) is arranged on a part of the chip to the inside of the peripheral circuit cell (13). The peripheral circuit cells include an ECL level input circuit an ECL level output circuit, a TTL level input circuit and a TTL level output circuit. Main source lines (15-1 to 15-4) are formed on the peripheral circuit cells (13) so as to surround the internal circuit (14). The main source lines (15-1 to 15-4) are connected to pads (12A, 12B, 12C, 12D) to which source potentials (VCC, GND, VEE, VTT) is applied. Branch source lines (16-11 to 16-14, 16-21 to 16-24) cross the main source lines (15-1 to 15-4) and connected to a selected one of the peripheral circuit cells (13) and said internal circuit (14). The main source lines (15-1 to 15-4) are selectively connected to the branch source lines (16-11 to 16-14, 16-21 to 16-24) by an interlayer connecting source line (24). <IMAGE> <IMAGE> |
