Semiconductor memory device including read only memory element f

Details Semiconductor memory device including read only memory element f Semiconductor memory device including read only memory element f

1986-12-15

1988-07-19

Moffitt, James W.

Static information storage and retrieval

Hardware for storage elements

Shields

365185, 365104, G11C 1140

Patent

active

047589841

ABSTRACT:
A semiconductor memory device including a substrate having one conductivity type; read only memory element formed in the substrate for storing fixed information, the element having a control gate, a floating gate, a source region, and a drain region, both of the regions having an opposite conductivity type to that of the substrate; a first region having the above one conductivity type which surrounds the element; a light shield layer, connected to the source region and the first region, for covering the element; a second region having the opposite conductivity type which is located outside of the first region for taking out the drain region; and a well region having the opposite conductivity type, the well region linking the drain region and the second region, a part of the first region being formed in the well.

REFERENCES:
patent: 4519050 (1985-05-01), Folmsbee
patent: 4530074 (1985-07-01), Folmsbee

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