Serial dichotomic method for sensing multiple-level non-volatile

Details Serial dichotomic method for sensing multiple-level non-volatile Serial dichotomic method for sensing multiple-level non-volatile

1996-01-29

1997-12-23

Nelms, David C.

Static information storage and retrieval

Floating gate

Multiple values

36518521, 36518533, G11C 1134

Patent

active

057012652

ABSTRACT:
A serial dichotomic method for sensing multiple-level non-volatile memory cells which can take one of m=2.sup.n (n>=2) different programming levels, provides for biasing a memory cell to be sensed in a predetermined condition, so that the memory cell sinks a cell current with a value belonging to a plurality of m distinct cell current values, and for: a) comparing the cell current with a reference current which has a value comprised between a minimum value and a maximum value of said plurality of m cell current values, thus dividing said plurality of cell current values into two sub-pluralities of cell current values, and determining the sub-plurality of cell current values to which the cell current belongs; b) repeating the step a) until the sub-plurality of cell current values to which the cell current belongs comprises only one cell current value, which is the value for the current of the memory cell to be sensed.

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Bauer, M., et al., "A Multilevel-Cell 32Mb Flash Memory," Digest of Technical Papers, IEEE International Solid-State Circuits Conference, Feb. 16, 1995, pp. 119, 132-133, 351.

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