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An electrically alterable nonvolatile memory cell using a floating-gate structure

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5 Author(s)
Guterman, Daniel C. ; Texas Instruments Incorporated, Houston, TX ; Rimawi, I.H. ; Te-Long Chiu ; Halvorson, R.D.
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An electrically alterable, floating-gate, nonvolatile memory transistor has been developed, with a cell area of under 500 µm2, and using an advanced n-channel, polysilicon gate process. Cell programming occurs via hot-electron injection, exhibiting three distinct operating regimes. Erase, on the other hand, is based on field emission from floating gate to control gate. The magnitude of electrical erase is determined by applied bias, device parameters, and processing history, particularly the interlevel oxidation temperature. Analysis of experimental data shows that electrical erase does change programming characteristics significantly, and must be accounted for in circuit design. Memory retention, determined by thermal stress, is comparable to commercially available EPROM's. The memory cell exhibits better than 1000-cycle write/erase capability, with degradation in interlevel conduction being the principal factor limiting endurance. A 5-V, 16K high-speed EAROM has been developed which shows successful programming and erase behavior at nominal voltages of 25 and 35 V, respectively.

Published in:

Electron Devices, IEEE Transactions on  (Volume:26 ,  Issue: 4 )

Date of Publication:

Apr 1979

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