Method for producing a ROM on a semiconductor device having a no

Details Method for producing a ROM on a semiconductor device having a no Method for producing a ROM on a semiconductor device having a no

1993-03-26

1995-04-04

Chaudhuri, Olik

Fishing, trapping, and vermin destroying

437 43, 437 45, 365178, A01L 21265

Patent

active

054037646

ABSTRACT:
In a method for producing a semiconductor device having a nonvolatile memory capable of electrically writing, reading and erasing, and a read only memory; the improvement wherein the method includes a step of writing a state of "0" or "1" in the read only memory by doping said read only memory with an impurity for adjusting a threshold voltage of the read only memory, and steps for producing the read only memory other than the step of writing are the same as steps for producing the nonvolatile memory.

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patent: 4367580 (1983-01-01), Guterman
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patent: 4500899 (1985-02-01), Shirai et al.
patent: 4513494 (1985-04-01), Batra
patent: 5094971 (1992-03-01), Kanebako
patent: 5229631 (1993-07-01), Woo

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