Method for multilevel programming of phase change memory...

Details Method for multilevel programming of phase change memory... Method for multilevel programming of phase change memory...

2007-12-03

2009-12-29

Le, Thong Q (Department: 2827)

Static information storage and retrieval

Systems using particular element

Amorphous

C365S148000, C365S100000, C365S046000

Reexamination Certificate

active

07639526

ABSTRACT:
A method and apparatus for programming a phase change memory cell is disclosed. A phase change memory cell includes a memory element of a phase change material having a first state, in which the phase change material is crystalline and has a minimum resistance level, a second state in which the phase change material is amorphous and has a maximum resistance level, and a plurality of intermediate states with resistance levels there between. The method includes using programming pulses to program the phase change memory cell in either the set, reset, or one of the intermediate states. To program in the intermediate states, a programming pulse creates a crystalline percolation path having an average diameter through amorphous phase change material and a second programming pulse modifies the diameter of the crystalline percolation path to program the phase change memory cell to the proper current level.

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