Abstract
A fault-tolerant 30950 mil/SUP 2/ (19.9 mm/SUP 2/) 16K/spl times/1 static MOS RAM has been fabricated with a single polysilicon E/D NMOS process. Using circuit techniques normally restricted to dynamic RAMs, but adapted for asynchronous operation, the device achieves a typical access time of 30 ns while dissipating only 375 mW. Among the topics discussed in a new single-polysilicon memory cell configuration, the first truly asynchronous bootstrap circuit, an active bit-line equilibration and precharge scheme, and a new power-efficient substrate bias generator. Also described is an on-chip redundancy scheme which consumes approximately 2 percent of the total chip area, does not compromise access time and can be programmed using standard test equipment.
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