Radiation shield for EPROM cells

Details Radiation shield for EPROM cells Radiation shield for EPROM cells

1990-11-13

1991-09-17

Clawson, Jr., Joseph E.

Static information storage and retrieval

Hardware for storage elements

Shields

365104, 365114, 365185, 365218, 357 235, 357 84, G11C 702

Patent

active

050501232

ABSTRACT:
An improved shield for an EPROM cell comprising a first and second metalization cover sections along with upstanding elements is disclosed. The invented shield protects selected EPROM cells from exposure to radiation in redundant memory applications. The shielding structure is designed such that radiation incident upon the memory only reaches the cell after traveling a circuitous route defined by the upstanding members. The improvement also increases the reliability of the memory while adding a degree of flexibility to the layout of the cell.

REFERENCES:
patent: 3728695 (1973-04-01), Frohman-Bentchkowsky
patent: 3744036 (1973-07-01), Frohman-Bentchkowsky
patent: 4519050 (1982-06-01), Folmsbee
patent: 4530074 (1985-07-01), Folsmbee
patent: 4665503 (1987-05-01), Glasser
patent: 4758869 (1988-07-01), Eitan et al.
patent: 4758984 (1988-07-01), Yoshida
patent: 4805138 (1989-02-01), McElroy et al.
patent: 4970565 (1990-11-01), Wu et al.

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