Inventors:
Kameswara K. Rao - San Jose CA
Martin L. Voogel - Los Altos CA
James Karp - Saratoga CA
Shahin Toutounchi - Pleasanton CA
Michael J. Hart - Palo Alto CA
Daniel Gitlin - Palo Alto CA
Kevin T. Look - Fremont CA
Jongheon Jeong - Campbell CA
Radko G. Bankras - Enschede, NL
Assignee:
Xilinx, Inc. - San Jose CA
International Classification:
G11C 1400
US Classification:
36518508, 36518509, 365104
Abstract:
Memory cell structures and related circuitry for use in non-volatile memory devices are described. The cell structures can be fabricated utilizing standard CMOS processes, e. g. sub 0. 35 micron or sub 0. 25 micron processes. Preferably, the cell structures can be fabricated using 0. 18 micron or 0. 15 micron standard CMOS processes. Advantageously, the cell structures can be programmed so that a conductive path is formed between like type materials. For example, in certain cell structures a cell is programmed by applying a programming voltage in such a way as to form a conductive path between a p-type gate and a p-type source/drain region or an n-type gate and an n-type source/drain region. Programming cells in this manner advantageously provides a programmed cell having a low, linear resistance after programming. In addition, novel charge pump circuits are provided that, in a preferred embodiment, are located âon chipâ with an array of memory cells.