Abstract
Describes a new read-only memory (ROM) with minimum geometry. A cascade ratioless circuit configuration is used, which is process compatible with silicon-gate metal-oxide semiconductor (MOS) large-scale integration (LSI) using depletion load MOSTs. The content of a memory cell in the new ROM is determined by the choice of the MOST threshold mode, either an enhancement or depletion mode; this differs from the conventional ROM structure where the content of a memory cell is distinguished by the thickness of gate oxide. The size of a single bit of the ROM is only 196 /spl mu/m/SUP 2/ and is a reduction of 45 percent compared to a conventional silicon-gate ROM.
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