Memory apparatus with dynamic memory cells having different capa

Details Memory apparatus with dynamic memory cells having different capa Memory apparatus with dynamic memory cells having different capa

1996-05-20

1998-01-06

Clawson, Jr., Joseph E.

Static information storage and retrieval

Read only systems

Capacitative

365149, 365222, G11C 1704

Patent

active

057062250

ABSTRACT:
A memory apparatus with dynamic memory cells that can be used both as a read-only memory and also as a volatile memory is provided. The memory apparatus has a capacitance value allocated to the capacitors present in the memory cells; the value is required for operation as a read-only memory. For read-only memory operation, memory cells are provided whose capacitors have different capacitance values corresponding to the type of information to be stored. A method of operating a memory apparatus is also provided. In the method, the information can be set by first charging all the memory cells and then applying a refresh signal to the memory cells with such a clock rate that the memory cells with the larger capacitance value do not discharge, but the memory cells with the smaller capacitance value discharge. In operation as a volatile memory, a refresh signal is applied to the memory cells in the standard way.

REFERENCES:
patent: 3654499 (1972-04-01), Smith
patent: 5020025 (1991-05-01), Nix et al.
patent: 5341326 (1994-08-01), Takase et al.
patent: 5406507 (1995-04-01), Knierim et al.
patent: 5406511 (1995-04-01), Nogami
patent: 5418739 (1995-05-01), Takasugi
patent: 5544096 (1996-08-01), Takasugi

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