Integrated circuit memories including fuses between a decoder and a memory array for disabling defective storage cells in the memory array

Abstract

An integrated circuit memory device includes a two-dimensional memory array in which the first and second dimensions extend in first and second directions respectively. The memory device further includes a decoder for the first dimension and a plurality of fuses between the decoder and the memory array. Upon encountering a defective storage cell in the memory array, the appropriate fuse can be cut to physically segregate the decoder from the defective cell. This allows the memory to operate without any delay inserted for switching to a spare or redundant memory array of storage cells, thus maximizing the memory operating speed. In a preferred embodiment, the fuses are arranged such that the relative spacing between the fuses proceeds substantially along the second direction and the fuses are oriented lengthwise in the first direction. By following this arrangement, the impact on the layout area for the memory device is minimal.