Integrated circuit entirely protected against ultraviolet rays

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

1993-06-30

1995-08-08

Popek, Joseph A.

Static information storage and retrieval

Floating gate

Particular biasing

365 53, 365104, 365218, 257314, 257315, 257323, G11C 1134

Patent

active

054405106

ABSTRACT:
An integrated circuit unerasable memory cell which includes at least one memory cell consisting of a floating gate transistor with drain, source, and gate terminals, and a metallic shield embedded in the semiconductor substrate and covering the cell. Also provided are a diffused region defining a closed loop path on the substrate surface all around the transistor, and having said shield connected peripherally thereto in an unbroken fashion, and first and second wells extending in the substrate from the transistor to outside the diffused region, the first of said wells being connected directly to the gate terminal of the transistor. A contact inside the shield connects the shield's top surface to the cell's source. A protection diode (inside the shield) prevents charging of the floating gate during manufacture.

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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
patent: 5034786 (1991-07-01), Eitan
patent: 5050123 (1991-09-01), Castro
patent: 5086410 (1992-02-01), Bergemont

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