Abstract
A 64-kbit SRAM with high latch-up immunity has been developed with the application of a well-source structure combined with an epi-substrate. Heavy-ion beam exposure tests reveal that the device has high immunity from cosmic-ray induced latch-up, and the soft-error cross section is about 8.6 × 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-7</sup> cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> /(bit particle) for 73-MeV Ar ions.
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