Bit line control circuit for a memory array using 2-bit non-vola

Details Bit line control circuit for a memory array using 2-bit non-vola Bit line control circuit for a memory array using 2-bit non-vola

1999-02-04

2000-06-27

Nelms, David

Static information storage and retrieval

Floating gate

Particular biasing

36523004, G11C 1606

Patent

active

06081456&

ABSTRACT:
A bit line control circuit for accessing an array of 2-bit non-volatile memory cells. Each memory cell has a first and a second charge trapping regions. A set of bit lines extends between the array and the bit line control circuit. The bit line control circuit includes pass transistors that selectively route pairs of bit lines to corresponding voltage control circuits in either a first order or a second (reversed) order. This enables both the first and second charge trapping regions of the memory cells to be accessed from the same voltage control circuits. In one embodiment, the bit line control circuit includes a first-level pass transistor coupled to each bit line. A second set of bit lines is coupled to the first-level pass transistors. A parallel-connected pair of second-level pass transistors is coupled to each bit line in the second set of bit lines. A third set of bit lines is coupled to the second-level pass transistors. The voltage control circuits are coupled to the third set of bit lines. The voltage control circuits apply voltages to the third set of bit lines to perform read, write and erase operations in the memory cells of the memory array. The first and second level pass transistors provide a consistent path for accessing all memory cells in the array, as well as handling the edge conditions introduced by the right-most and left-most columns of memory cells.

REFERENCES:
patent: 5568425 (1996-10-01), Song
patent: 5768192 (1998-06-01), Eitan

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