Static information storage and retrieval – Floating gate – Particular connection
Patent
1996-10-07
1997-10-28
Nguyen, Tan T.
Static information storage and retrieval
Floating gate
Particular connection
36518511, 36518517, 36518505, 36518533, 36523003, G11C 1600
Patent
active
056823509
ABSTRACT:
A flash memory includes a bank of flash transistors forming a plurality of rows and a plurality of columns, each flash transistor having a gate, drain and source, where the gates of flash transistors in each row are coupled to common wordlines, the drains of flash transistors in each column are coupled to common metal 1 lines divided into even metal 1 lines and odd metal 1 lines and the sources of the flash transistors are coupled to a common sourceline. A set of first selection transistors are coupled between even metal 1 lines and metal 2 lines having a pitch twice that of said metal 1 lines and controlled by a first select signal to selectively couple the even metal 1 lines to the metal 2 lines. A set of second selection transistors are coupled between odd metal 1 lines and the metal 2 lines and controlled by a second select signal to selectively couple the odd metal 1 lines to the metal 2 lines. In one embodiment, the set of first selection transistors and the set of second selection transistors are large in comparison to the flash transistors. Advantages of the invention include improved selection of memory cells, higher memory cell density and lower resistance in the memory cell selection circuitry.
REFERENCES:
patent: 5345416 (1994-09-01), Nakagawara
patent: 5365484 (1994-11-01), Cleveland et al.
patent: 5554867 (1996-09-01), Ajika et al.
Hsu Fu-Chang
Lee Peter W.
Tsao Hsing-Ya
Aplus Integrated Circuits, Inc.
Nguyen Tan T.
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