Semiconductor memory device having a mask ROM and a PROM

Details Semiconductor memory device having a mask ROM and a PROM Semiconductor memory device having a mask ROM and a PROM

1990-09-18

1993-09-21

Popek, Joseph A.

Static information storage and retrieval

Read only systems

Semiconductive

365 94, 36518901, G11C 1700

Patent

active

052474763

ABSTRACT:
A semiconductor memory device with a mask ROM and a PROM whose program characteristics are different is provided with a switching means. The switching operation is performed so that the content of the mask ROM becomes effective when the mask ROM is programmed and so that the content of the PROM becomes effective when the RPOM is programmed. Thereby, both mask ROM and PROM become programmable, making the semiconductor memory device with mask ROM and PROM effectively operative.

REFERENCES:
patent: 4744054 (1988-05-01), Kawata et al.
patent: 4811303 (1989-03-01), Hirai
Japanese Patent Abstracts of Japan, vol. 13, No. 580, Dec. 21, 1989, JP880069250, Nakamura Tomoharu, "Mask Rom Device".
Electro, 8079 IEEE, vol. 7 (1982), May, N.Y., "Implementation of On-chip Redundancy Using Laser Fusing Techniques", James R. Flynn, pp. 1-5.

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