Abstract:
A method of forming a memory device on a semiconductor substrate having a memory region (with floating and control gates), a first logic region (with first logic gates) and a second logic region (with second logic gates). A first implantation forms the source regions adjacent the floating gates in the memory region, and the source and drain regions adjacent the first logic gates in the first logic region. A second implantation forms the source and drain regions adjacent the second logic gates in the second logic region. A third implantation forms the drain regions adjacent the control gates in the memory region, and enhances the source region in the memory region and the source/drain regions in the first logic region. A fourth implantation enhances the source/drain regions in the second logic region.
Abstract:
A stack gate structure for a non-volatile memory array has a semiconductor substrate having a plurality of substantially parallel spaced apart active regions, with each active region having an axis in a first direction. A first insulating material is between each stack gate structure in the second direction perpendicular to the first direction. Each stack gate structure has a second insulating material over the active region, a charge holding gate over the second insulating material, a third insulating material over the charge holding gate, and a first portion of a control gate over the third insulating material. A second portion of the control gate is over the first portion of the control gate and over the first insulating material adjacent thereto and extending in the second direction. A fourth insulating material is over the second portion of the control gate.
Abstract:
The present invention relates to a flash memory device that uses dummy memory cells as source line pull down circuits. In one embodiment, when a memory cell is in read mode or erase mode, its source line is coupled to ground through a bitline of a dummy memory cell, which in turn is coupled to ground. When the memory cell is in program mode, the bitline of the dummy memory cell is coupled to an inhibit voltage, which places the dummy memory cell in a program inhibit mode that maintains the dummy memory cell in erased state.
Abstract:
A split gate NAND flash memory structure is formed on a semiconductor substrate of a first conductivity type. The NAND structure comprises a first region of a second conductivity type in the substrate with a second region of the second conductivity type in the substrate, spaced apart from the first region. A continuous first channel region is defined between the first region and the second region. A plurality of floating gates are spaced apart from one another with each positioned over a separate portion of the channel region. A plurality of control gates are provided with each associated with and adjacent to a floating gate. Each control gate has two portions: a first portion over a portion of the channel region and a second portion over the associated floating gate and capacitively coupled thereto.
Abstract:
The present invention relates to a circuit and method for low power operation in a flash memory system. In disclosed embodiments of a selection-decoding circuit path, pull-up and pull-down circuits are used to save values at certain output nodes during a power save or shut down modes, which allows the main power source to be shut down while still maintaining the values.
Abstract:
A method of forming a semiconductor device starts with a substrate of silicon, a first insulation layer on the silicon, and a silicon layer on the first insulation layer. The silicon layer and the insulation layer are removed just from a second substrate area. A second insulation layer is formed over the silicon layer in the substrate first area and over the silicon in the second substrate area. A first plurality of trenches is formed in the first substrate area that each extends through all the layers and into the silicon. A second plurality of trenches is formed in the second substrate area that each extends through the second insulation layer and into the silicon. An insulation material is formed in the first and second trenches. Logic devices are formed in the first substrate area, and memory cells are formed in the second substrate area.
Abstract:
A non-volatile memory device and method for programming cells using repeated pulses of program voltages, with interleaved read operations to determine the level of read current, until the desired programming state is achieved. Each successive program pulse has one or more program voltages increased by a step value relative to the previous pulse. For a single level cell type, each cell is individually removed from the programming pulses after reaching a first read current threshold, and the step value is increased for one or more kicker pulses thereafter. For a multi-level cell type, the step value drops after one of the cells reaches a first read current threshold, some cells are individually removed from the programming pulses after reaching a second read current threshold while others are individually removed from the programming pulses after reaching a third read current threshold.
Abstract:
The disclosed embodiments comprise a flash memory device that can be configured to operate as a read only memory device. In some embodiments, the flash memory device can be configured into a flash memory portion and a read only memory portion.
Abstract:
An integrated circuit die has a first die pad for receiving a first voltage and a second die pad for receiving a second voltage. The second voltage is less than the first voltage and is generated by a voltage regulator that receives the first voltage. A first circuit which is operable at the first voltage is in the integrated circuit die. A second circuit which is operable at the second voltage is in the integrated circuit die and is connected to the second die pad. The voltage regulator is enabled by a controller.