Method of programming a CMOS read only memory at the second meta

Details Method of programming a CMOS read only memory at the second meta Method of programming a CMOS read only memory at the second meta

1994-11-14

1995-11-28

Nelms, David C.

Static information storage and retrieval

Read only systems

Semiconductive

365 94, 365103, G11C 1700

Patent

active

054714168

ABSTRACT:
A CMOS ROM is fabricated and programmed using a two-metal fabrication process which is substantially equivalent to a conventional CMOS polysilicon gate manufacturing technique so that the CMOS ROM is advantageously fabricated in the same process steps that are used to fabricate the other, non-ROM circuits on an integrated circuit chip. In this method, multiple bit-lines in a first metal layer are formed which overlie a substrate containing the array of transistors. The bit-lines are connected to drain regions of the transistors. A dielectric insulating layer is formed over the substrate and the bit-lines and the dielectric insulating layer is perforated by vias which allow connecting to the first metal layer. Multiple word-lines and multiple reference voltage lines are formed in a second metal layer overlying the dielectric insulating layer. Either a word-line or a reference voltage line is programmably selected to connect to the gate of a transistor for each transistor of the multiple transistors.

REFERENCES:
patent: 4165538 (1979-08-01), Kitamura
patent: 4219836 (1980-08-01), McElroy
patent: 4326329 (1982-04-01), McElroy
patent: 4327424 (1982-04-01), Wu
patent: 4384399 (1983-05-01), Kuo
patent: 4390971 (1983-06-01), Kuo
patent: 4599704 (1986-07-01), Mazin
patent: 4725986 (1988-02-01), Kouba

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