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Ultra high density flash memory having vertically stacked devices

  • US 5,973,352 A
  • Filed: 08/20/1997
  • Issued: 10/26/1999
  • Est. Priority Date: 08/20/1997
  • Status: Expired due to Term
First Claim
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1. A memory cell, comprising:

  • a pillar of semiconductor material extending outwardly from a working surface of a substrate to form source/drain and body regions, the pillar having a number of sides;

    at least one pair of vertically stacked floating gates, each pair associated with a side of the pillar, a dielectric disposed between the floating gates within each pair; and

    one or more control gates, each control gate associated with at least one floating gate so as to allow selective storage and retrieval of data on the floating gates.

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