Locking device with a never-programmable floating gate cell

Details Locking device with a never-programmable floating gate cell Locking device with a never-programmable floating gate cell

1991-11-15

1993-12-14

Wojciechowicz, Edward

Active solid-state devices (e.g., transistors, solid-state diode

Field effect device

Having insulated electrode

257322, 257175, 257435, H01L 2968

Patent

active

052705625

ABSTRACT:
Locking devices are made by using a floating gate cell which is put into a state of being never programmable electrically by placing a voltage limiter between its drain zone and the ground and between its source zone and the ground. The cell can no longer ever be programmed by ultra-violet rays because of the interposition of a metal pad above its control gate. A voltage limiter is made by using a Zener diode made by the joining, to the drain and source zones, of a zone with opposite doping, placed outside the channel zone and connected to the ground.

REFERENCES:
patent: 4744062 (1988-05-01), Nakamura et al.
patent: 4805138 (1989-02-01), McElroy et al.
patent: 4835111 (1989-05-01), Wright et al.

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