Integrated circuit entirely protected against ultraviolet rays

Details Integrated circuit entirely protected against ultraviolet rays Integrated circuit entirely protected against ultraviolet rays

1990-12-14

1993-08-10

LaRoche, Eugene R.

Static information storage and retrieval

Hardware for storage elements

Shields

365185, 257659, G11C 702

Patent

active

052355411

ABSTRACT:
An integrated circuit ultraviolet-unerasable floating-gate memory, which includes EEPROM (or EPROM) memory cells totally enclosed by a metal mask. The metal mask includes metal projections which are anchored in substrate diffusions, to define a ring completely surrounding two (or four) floating-gate cells. The cells are single-polysilicon cells, in which the control gate is a diffusion. Signals are routed out through diffusions which go underneath the metal ring. A selection transistor, for each cell, is located outside the metal ring.

REFERENCES:
patent: 4519050 (1985-05-01), Folmsbee
patent: 4530074 (1985-07-01), Folmsbee
patent: 4577295 (1986-03-01), Eitan et al.
patent: 4758869 (1988-07-01), Eitan et al.
patent: 4805138 (1989-02-01), McElroy et al.
patent: 4970565 (1990-11-01), Wu et al.
patent: 5034786 (1991-07-01), Eitan
patent: 5050123 (1991-09-01), Castro
patent: 5086410 (1992-02-01), Bergemont

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