Abstract: Channel boosting is improved in non-volatile storage to reduce program disturb. A pre-charge module voltage source is used to pre-charge bit lines during a programming operation. The pre-charge module voltage source is coupled to a substrate channel via the bit lines to boost the channel. An additional source of boosting is provided by electromagnetically coupling a voltage from a conductive element to the bit lines and the channel. To achieve this, the bit lines and the channel are allowed to float together by disconnecting the bit lines from the voltage sources. The conductive element can be a source line, power supply line or substrate body, for instance, which receives an increasing voltage during the pre-charging and is proximate to the bit lines.
Type:
Grant
Filed:
May 23, 2008
Date of Patent:
May 18, 2010
Assignee:
SanDisk Corporation
Inventors:
Yingda Dong, Man L. Mui, Jeffrey W. Lutze, Shinji Sato, Gerrit Jan Hemink
Abstract: An integrated circuit memory device comprises a memory array to store data, a circuit to output the data at a pin, and a register to store a value that indicates a mode of operation of the integrated circuit memory device. The mode of operation is selected from at least one of a synchronous mode of operation and an asynchronous mode of operation. During the synchronous mode of operation, the circuit outputs the data in response to a transition of an external clock signal. During the asynchronous mode of operation, the circuit outputs the data after a period of time from when a transition of an external control signal is detected.
Type:
Grant
Filed:
May 6, 2005
Date of Patent:
May 1, 2007
Assignee:
Rambus Inc.
Inventors:
Richard Maurice Barth, Mark Alan Horowitz, Craig Edward Hampel, Frederick Abbot Ware