Patents by Inventor John L. McCollum

John L. McCollum has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20200090747
    Abstract: A method for programming a ReRAM cell including a ReRAM device connected in series with an access transistor includes biasing the ReRAM cell with a programming potential that configures the access transistor in a common-source configuration and applying at least one programming voltage pulse to a gate of the access transistor, the programming voltage pulse having a magnitude selected to limit programming current to a preselected value.
    Type: Application
    Filed: November 24, 2019
    Publication date: March 19, 2020
    Applicant: Microsemi SoC Corp.
    Inventor: John L. McCollum
  • Patent number: 10553643
    Abstract: A layout is presented for a ReRAM memory cell array including rows and columns of ReRAM cells, each ReRAM cell is in a row and column of ReRAM cells. Each ReRAM cell includes a ReRAM device. A first transistor is coupled between the ReRAM device and a first bit line associated with the column containing the ReRAM cell. The first transistor has a gate coupled to a first word line associated with the row containing the ReRAM cell. A second transistor is coupled between the ReRAM device and a second bit line associated with the column containing the ReRAM cell. The second transistor has a gate coupled to a second word line associated with the row containing the ReRAM cell.
    Type: Grant
    Filed: October 9, 2018
    Date of Patent: February 4, 2020
    Assignee: Microsemi SoC Corp.
    Inventor: John L McCollum
  • Patent number: 10553646
    Abstract: A ReRAM memory array includes rows and columns of ReRAM cells. Each ReRAM cell in a row and column of the array includes a ReRAM device having an ion source end coupled to a bias line associated with the row of the array containing the ReRAM device. A first transistor is coupled between the solid electrolyte end of the ReRAM device and a bit line associated with the column of the array containing the ReRAM cell. The first transistor has a gate coupled to a first word line associated with the row containing the ReRAM cell. A second transistor is coupled between the solid electrolyte end of the ReRAM device and the bit line associated with the column of the array containing the ReRAM cell. The second transistor has a gate coupled to a second word line associated with the row containing the ReRAM cell.
    Type: Grant
    Filed: October 9, 2018
    Date of Patent: February 4, 2020
    Assignee: Microsemi SoC Corp.
    Inventor: John L. McCollum
  • Patent number: 10546633
    Abstract: A resistive random access memory cell includes three resistive random access memory devices, each resistive random access memory device having an ion source layer and a solid electrolyte layer. The first and second resistive random access memory devices are connected in series such that either both ion source layers or both solid electrolyte layers are adjacent to one another. A third resistive random access memory device is connected in series with the first and second resistive random access memory devices.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: January 28, 2020
    Assignee: Microsemi SoC Corp.
    Inventor: John L McCollum
  • Publication number: 20200006429
    Abstract: A layout is presented for a ReRAM memory cell array including rows and columns of ReRAM cells, each ReRAM cell is in a row and column of ReRAM cells. Each ReRAM cell includes a ReRAM device. A first transistor is coupled between the ReRAM device and a first bit line associated with the column containing the ReRAM cell. The first transistor has a gate coupled to a first word line associated with the row containing the ReRAM cell. A second transistor is coupled between the ReRAM device and a second bit line associated with the column containing the ReRAM cell. The second transistor has a gate coupled to a second word line associated with the row containing the ReRAM cell.
    Type: Application
    Filed: October 9, 2018
    Publication date: January 2, 2020
    Applicant: Microsemi SoC Corp.
    Inventor: John L. McCollum
  • Publication number: 20200006430
    Abstract: A ReRAM memory array includes rows and columns of ReRAM cells. Each ReRAM cell in a row and column of the array includes a ReRAM device having an ion source end coupled to a bias line associated with the row of the array containing the ReRAM device. A first transistor is coupled between the solid electrolyte end of the ReRAM device and a bit line associated with the column of the array containing the ReRAM cell. The first transistor has a gate coupled to a first word line associated with the row containing the ReRAM cell. A second transistor is coupled between the solid electrolyte end of the ReRAM device and the bit line associated with the column of the array containing the ReRAM cell. The second transistor has a gate coupled to a second word line associated with the row containing the ReRAM cell.
    Type: Application
    Filed: October 9, 2018
    Publication date: January 2, 2020
    Applicant: Microsemi SoC Corp.
    Inventor: John L McCollum
  • Patent number: 10522224
    Abstract: A method for programming a ReRAM cell including a ReRAM device connected in series with an access transistor includes biasing the ReRAM cell with a programming potential that configures the access transistor in a common-source configuration and applying at least one programming voltage pulse to a gate of the access transistor, the programming voltage pulse having a magnitude selected to limit programming current to a preselected value.
    Type: Grant
    Filed: July 17, 2018
    Date of Patent: December 31, 2019
    Assignee: Microsemi SoC Corp.
    Inventor: John L. McCollum
  • Publication number: 20190237139
    Abstract: A configuration memory cell includes a latch portion including a cross-coupled latch having complementary output nodes, and a programmable read-only memory (PROM) portion coupled to one of the complementary output nodes of the latch portion, the PROM portion including a programmable and erasable ReRAM device.
    Type: Application
    Filed: January 16, 2019
    Publication date: August 1, 2019
    Applicant: Microsemi SoC Corp.
    Inventors: John L. McCollum, Jonathan W. Greene
  • Publication number: 20190229734
    Abstract: A buffered multiplexer includes a multiplexer having N multiplexer inputs each input selectively coupleable to a single multiplexer output. A non-inverting buffer has an input coupled to the multiplexer output and an output forming the output node of the buffered multiplexer. At least one vertical resistor is coupled between the input and the output of the non-inverting buffer.
    Type: Application
    Filed: January 16, 2019
    Publication date: July 25, 2019
    Applicant: Microsemi SoC Corp.
    Inventors: Volker Hecht, John L. McCollum
  • Publication number: 20190228825
    Abstract: A static random-access memory (SRAM) cell includes a non-inverting logic element having an input and an output. A vertical resistor feedback device is connected between the output and the input of the non-inverting logic element.
    Type: Application
    Filed: January 15, 2019
    Publication date: July 25, 2019
    Applicant: Microsemi SoC Corp.
    Inventors: Volker Hecht, John L. McCollum
  • Publication number: 20190221259
    Abstract: A nonvolatile memory cell includes a first voltage supply node, a second voltage supply node, an output node, a resistive random access memory device having a first electrode and a second electrode, the first electrode connected to the first voltage supply node, at least one p-channel transistor connected between the second electrode of the resistive random access memory device and the output node, at least one n-channel transistor connected between the output node and the second voltage supply node, and an inverter connected between the output node and a gate of the at least one n-channel transistor.
    Type: Application
    Filed: January 3, 2019
    Publication date: July 18, 2019
    Applicant: Microsemi SoC Corp.
    Inventor: John L. McCollum
  • Patent number: 10270451
    Abstract: A low-leakage resistive random access memory cell includes a complementary pair of bit lines and a switch node. A first ReRAM device is connected to a first one of the bit lines. A p-channel transistor has a source connected to the ReRAM device, a drain connected to the switch node, and a gate connected to a bias potential. A second ReRAM device is connected to a second one of the bit lines. An n-channel transistor has a source connected to the ReRAM device a drain connected to the switch node, and a gate connected to a bias potential.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: April 23, 2019
    Assignee: Microsemi SoC Corporation
    Inventors: John L. McCollum, Esmat Z. Hamdy
  • Publication number: 20190051352
    Abstract: A method for programming a ReRAM cell including a ReRAM device connected in series with an access transistor includes biasing the ReRAM cell with a programming potential that configures the access transistor in a common-source configuration and applying at least one programming voltage pulse to a gate of the access transistor, the programming voltage pulse having a magnitude selected to limit programming current to a preselected value.
    Type: Application
    Filed: July 17, 2018
    Publication date: February 14, 2019
    Applicant: Microsemi SoC Corp.
    Inventor: John L. McCollum
  • Patent number: 10128852
    Abstract: A low-leakage resistive random access memory cell includes a complementary pair of bit lines and a switch node. A first ReRAM device is connected to a first one of the bit lines. A p-channel transistor has a source connected to the ReRAM device, a drain connected to the switch node, and a gate connected to a bias potential. A second ReRAM device is connected to a second one of the bit lines. An n-channel transistor has a source connected to the ReRAM device a drain connected to the switch node, and a gate connected to a bias potential.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: November 13, 2018
    Assignee: Microsemi SoC Corporation
    Inventors: John L. McCollum, Esmat Z. Hamdy
  • Publication number: 20180166135
    Abstract: A resistive random access memory cell includes three resistive random access memory devices, each resistive random access memory device having an ion source layer and a solid electrolyte layer. The first and second resistive random access memory devices are connected in series such that either both ion source layers or both solid electrolyte layers are adjacent to one another. A third resistive random access memory device is connected in series with the first and second resistive random access memory devices.
    Type: Application
    Filed: November 27, 2017
    Publication date: June 14, 2018
    Inventor: John L. McCollum
  • Patent number: 9990993
    Abstract: A ReRAM cell array has having at least one row and one column includes first and second complementary bit lines for each row, a word line, a p-word line, and an n-word line for each column. A ReRAM cell at each row and column of the array includes a first ReRAM device, its first end connected to the first complementary bit line of its row, a p-channel transistor, its source connected to a second end of the first ReRAM device, its drain connected to a switch node, its gate connected to the p-channel word line of its column, a second ReRAM device, its first end connected to the second complementary bit line of its row, an n-channel transistor, its source connected to a second end of the second ReRAM device, its drain connected to the switch node, its gate connected to the n-channel word line of its column.
    Type: Grant
    Filed: December 9, 2016
    Date of Patent: June 5, 2018
    Assignee: Microsemi SoC Corporation
    Inventors: John L. McCollum, Volker Hecht
  • Patent number: 9991894
    Abstract: A layout arrangement for a resistive random access memory cell includes an active area, a polysilicon row address line over the active region, a metal column address line running orthogonal to the row address line and having an active region contact portion extending over the active region and having a contact to the active region. A metal output line runs parallel to the column address line over the active region. A first cell contact region intersects with the output line and has a contact to the active region. A first metal cell contact region forms an intersection with the first cell contact region. A first resistive random access memory device is formed at the intersection of the first cell contact region and the output line. A second resistive random access memory device is formed at the intersection of the first cell contact region and the first cell contact region.
    Type: Grant
    Filed: August 26, 2015
    Date of Patent: June 5, 2018
    Assignee: Microsemi SoC Corp.
    Inventors: Jonathan Greene, Frank Hawley, John L. McCollum
  • Publication number: 20180090205
    Abstract: A ReRAM cell array has having at least one row and one column includes first and second complementary bit lines for each row, a word line, a p-word line, and an n-word line for each column. A ReRAM cell at each row and column of the array includes a first ReRAM device, its first end connected to the first complementary bit line of its row, a p-channel transistor, its source connected to a second end of the first ReRAM device, its drain connected to a switch node, its gate connected to the p-channel word line of its column, a second ReRAM device, its first end connected to the second complementary bit line of its row, an n-channel transistor, its source connected to a second end of the second ReRAM device, its drain connected to the switch node, its gate connected to the n-channel word line of its column.
    Type: Application
    Filed: December 9, 2016
    Publication date: March 29, 2018
    Applicant: Microsemi SoC Corporation
    Inventors: John L. McCollum, Volker Hecht
  • Publication number: 20180083634
    Abstract: A low-leakage resistive random access memory cell includes a complementary pair of bit lines and a switch node. A first ReRAM device is connected to a first one of the bit lines. A p-channel transistor has a source connected to the ReRAM device, a drain connected to the switch node, and a gate connected to a bias potential. A second ReRAM device is connected to a second one of the bit lines. An n-channel transistor has a source connected to the ReRAM device a drain connected to the switch node, and a gate connected to a bias potential.
    Type: Application
    Filed: November 27, 2017
    Publication date: March 22, 2018
    Inventors: John L. McCollum, Esmat Z. Hamdy
  • Patent number: 9755072
    Abstract: A method for fabricating a high-voltage transistor on a semiconductor substrate includes defining and forming shallow trench isolation regions for all of the transistors, defining and forming well regions for all of the transistors, forming a gate oxide layer in the well regions for all of the transistor, forming gates for all of the transistors over the gate oxide layer, implanting a dopant to form lightly-doped drain regions for all of the transistors, the lightly-doped drain regions for at least drains of the high-voltage transistors being spaced apart from an inner edge of the shallow trench isolation regions, forming gate spacers at sides of the gates of all of the transistors, and implanting a dopant to form sources and drains for all of the transistors, the drains of the high-voltage transistors being formed completely surrounded by the lightly-doped drain regions of the high-voltage transistors.
    Type: Grant
    Filed: March 21, 2016
    Date of Patent: September 5, 2017
    Assignee: MICROSEMI SoC CORPORATION
    Inventors: Fengliang Xue, Fethi Dhaoui, John L. McCollum