Semiconductor memory device

Details Semiconductor memory device Semiconductor memory device

1993-09-08

1994-05-17

LaRoche, Eugene R.

Static information storage and retrieval

Hardware for storage elements

437189, 437190, 437228, 427534, H01L 2978, H01L 2190, H01L 2188

Patent

active

053134176

ABSTRACT:
A semiconductor memory device including a substrate on which a memory cell array portion and a peripheral circuit portion for the memory cell array portion are provided, the surface of the memory cell array portion being higher than the surface of the peripheral circuit portion. A glass layer is formed on the peripheral circuit portion with the glass layer having a predetermined thickness for offsetting the difference in height between the surface of the memory cell array portion and that of the peripheral circuit portion, so as to provide a substantially even surface over the memory cell array portion and the peripheral circuit portion. A metal wiring for the memory cell array portion and the peripheral circuit portion is formed in a predetermined pattern on the substantially even surface.

REFERENCES:
patent: 4775550 (1988-10-01), Chu et al.
patent: 4894351 (1990-01-01), Batty
patent: 4965226 (1990-10-01), Gootzen et al.
patent: 4970177 (1990-11-01), Mizushima

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