Memory system having memory cells capable of storing more than t

Details Memory system having memory cells capable of storing more than t Memory system having memory cells capable of storing more than t

1981-02-25

1983-11-15

Popek, Joseph A.

Static information storage and retrieval

Read only systems

365207, 365210, G11C 1140

Patent

active

044159927

ABSTRACT:
A memory system having a plurality of memory cells each capable of storing more than two states also has a reference voltage generator which is used to determine the state stored in a selected memory cell. The plurality of memory cells are arranged in groups of columns, and in a preferred embodiment, the reference voltage generator is arranged in columns which are located between two of the groups of columns. The memory system uses voltage sensing as opposed to current sensing and therefore the only current used is to charge line capacitances. The voltage reference generator is only enabled during the period of time that a cell is being read from.

REFERENCES:
patent: 4094008 (1978-06-01), Lockwood et al.
patent: 4202044 (1980-05-01), Beilstein, Jr. et al.
patent: 4342102 (1982-07-01), Puar

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