Memory array circuit with two-bit memory cells

Static information storage and retrieval – Interconnection arrangements

Reexamination Certificate

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Details

C365S104000, C365S185030

Reexamination Certificate

active

07355876

ABSTRACT:
A high-speed nonvolatile memory array has two-bit memory cells, each connected to a mutually adjacent pair of sub-bit lines. The sub-bit lines are connected to a common power supply line through switching elements controlled in a cyclic sequence by 2m signal lines, where m is an integer greater than one. The memory array circuit also has main bit lines, each connected to a group of m consecutive sub-bit lines through switching elements controlled in a cyclic sequence by m signal lines. Data are read through two mutually adjacent main bit lines from two memory cells selected so that the sub-bit lines connecting the two main bit lines to the two memory cells are located between the sub-bit lines connecting the two memory cells to the common power line, an arrangement that reduces parasitic capacitance.

REFERENCES:
patent: 6018487 (2000-01-01), Lee et al.
patent: 6147912 (2000-11-01), Kitazawa
patent: 6233168 (2001-05-01), Kokubun et al.
patent: 6477089 (2002-11-01), Takeda et al.
patent: 2004/0222452 (2004-11-01), Matsuoka et al.
patent: 11-203880 (1999-07-01), None
patent: 2000-57794 (2000-02-01), None
patent: 2004-335797 (2004-11-01), None

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