Other

Minoru Ebihara

Hiroki Fujisawa

Seiji Narui

Masanori Isoda

Hiroshi Otori

Akira Ohta

Relief units (UNITb) each having electrically programmable electric fuses for storing information according to the difference in threshold voltage, and an address comparator are disposed in a second area, and relief units (UNITa) each having laser fuses and an address comparator are disposed in a first area. Both areas are adjacent to each other along an address signal wiring for each comparator, and the address signal wiring is laid out linearly. Even if the electric fuses and the laser fuses are caused to coexist for relief address storage, the difference between by-chip occupied areas due to the difference between their configurations can be adjusted based on the size extending in the direction of the address signal wiring, and an increase in the by-chip occupied area can be restrained to the utmost from a layout viewpoint.

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Hachioji, Japan

Minoru Ebihara