Radiation shield for a portion of a radiation sensitive integrat

Details Radiation shield for a portion of a radiation sensitive integrat Radiation shield for a portion of a radiation sensitive integrat

1984-05-31

1985-07-16

Fears, Terrell W.

Static information storage and retrieval

Hardware for storage elements

Shields

357 84, G11C 500

Patent

active

045300747

ABSTRACT:
A shield for an EPROM cell. Generally MOS electrically programmable read-only memories (EPROMs), can be erased by exposure to radiation. Typically, the EPROM is encapsulated in a package which has a transparent lid to allow radiation to pass through the package to erase the EPROM cells. The invented shield protects selected EPROM cells from the radiation and thus prevent these cells from being erased even though the entire EPROM package is subjected to radiation and other EPROM cells are erased. The shielded EPROM cells are useful for discretionary connections such as those needed in redundant memories.

REFERENCES:
patent: 3157857 (1964-11-01), Stapper et al.
patent: 4494217 (1985-01-01), Suzuki et al.
IBM Tech. Dis. Bul., vol. 23, No. 5, Oct. 1980, "Alpha Particle Shield", J. A. Benenati, pp. 1892-1893.

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