Static information storage and retrieval – Hardware for storage elements – Shields
Patent
1981-01-05
1985-01-15
Hecker, Stuart N.
Static information storage and retrieval
Hardware for storage elements
Shields
357 23, 357 84, 365174, G11C 500, G11C 1134
Patent
active
044942176
ABSTRACT:
In a semiconductor memory device comprising semiconductor memory elements having such a degree of integration in memory circuits as to produce soft errors by incident .alpha.-rays derived from a packaging material and a package which packages the memory elements and is made from the packaging material, when an .alpha.-rays shielding layer made from a resinous material, which may contain one or more high-purity fillers, containing a total amount of 1 part per billion or less of uranium and thorium is interposed between the memory elements and the package, the generation of soft errors is reduced remarkably.
REFERENCES:
patent: 4323405 (1982-04-01), Uno et al.
May et al., Proceedings 16th International Reliability Physics Symposium, 4/18-20/78, San Diego, pp. 33-40.
Anolick, "Reduction of Memory Errors Due to Alpha Particles", IBM Tech. Disc. Bul., vol. 22, No. 6, 11/79, pp. 2345-2346.
Ward, "Alpha Particle Shield", IBM Tech. Disc. Bul., vol. 22, No. 4, 9/79, p. 1398.
Anolick, "Prevention of Errors in Charge-Coupled Devices Due to Alpha Emission", IBM Tech. Disc. Bul., vol. 22, No. 2, 7/79, p. 678.
Dougherty et al., "Low .alpha. Particle Package Design", IBM Tech. Disc. Bul., vol. 22, No. 7, 12/79, p. 2748.
Makino Daisuke
Mukai Junji
Nishikawa Akio
Sato Mikio
Suzuki Hiroshi
Hecker Stuart N.
Hitachi , Ltd.
Hitachi Chemical Company Ltd.
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