Integrated circuit having non-volatile programmable semiconducto

Details Integrated circuit having non-volatile programmable semiconducto Integrated circuit having non-volatile programmable semiconducto

1981-11-16

1984-01-24

Fears, Terrell W.

Static information storage and retrieval

Powering

307285, 307297, G11C 700

Patent

active

044280718

ABSTRACT:
A circuit arrangement is provided to supervise the supply voltage of the programming logic of a non-volatile integrated circuit comprising insulated-gate field-effect transistors whose threshold voltages are altered by the programming logic and whose gate electrodes are connected wordwise to word lines. The circuit arrangement is integrated into the integrated circuit and includes an integrated threshold switch connected to the programming voltage source and a reference voltage source having at least one, but preferably two zener diodes connected in series. The threshold switch in combination with supervision logic connects the word lines to the substrate voltage of the programming logic when the supply voltage is lost. An additional threshold switch coupled to the supervision logic, the reference voltage source and the programming voltage line connects the word lines to the substrate voltage of the programming logic when the programming voltage is lost.

REFERENCES:
patent: 4368524 (1983-01-01), Nakamura et al.

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