Radiation shield for an integrated circuit memory with redundant

Details Radiation shield for an integrated circuit memory with redundant Radiation shield for an integrated circuit memory with redundant

1982-06-17

1985-05-21

Hecker, Stuart N.

Static information storage and retrieval

Hardware for storage elements

Shields

365200, 365218, 357 84, G11C 1134

Patent

active

045190500

ABSTRACT:
A shield for an EPROM cell comprising an upper cover and upstanding elements. 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: 4047163 (1977-09-01), Choate et al.
patent: 4393474 (1983-07-01), McElroy
patent: 4393479 (1983-07-01), Du et al.
patent: 4423548 (1984-01-01), Hulseweh
McKenny, "Good Bits Swapped for Bad in 64-Kilobit EPROM," Electronics, Mar. 13, 1980, pp. 115-121.

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