Patents by Inventor Yasuhito Ichimura

Yasuhito Ichimura 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).

  • Patent number: 6373745
    Abstract: The objective of this invention is to reduce the layout area while guaranteeing data retention stability in a static type semiconductor memory cell. This SRAM cell is constituted with two MOS transistors 10 and 12 and one inverter circuit 14. The source terminal of PMOS transistor 10 is connected to bit line (BL), the drain terminal is connected to data storage node (Na), and the gate terminal is connected to word line (WL). The source tenninal of NMOS transistor 12 is connected to a supply voltage terminal that provides low-level reference potential VSS (for example, zero volts), the drain terminal is connected to data storage node (Na), and the gate terminal is connected to the output terminal o inverter circuit 14. The input terminal of inverter circuit 14 is connected to data storage node (Na).
    Type: Grant
    Filed: March 21, 2001
    Date of Patent: April 16, 2002
    Assignee: Texas Instruments Incorporated
    Inventors: Yoritaka Saito, Hiroshi Ikeda, Takumi Nasu, Kohsuke Ikeda, Yoshinobu Matsumoto, Satoshi Nakayama, Yasuhito Ichimura
  • Publication number: 20010033511
    Abstract: The objective of this invention is to reduce the layout area while guaranteeing data retention stability in a static type semiconductor memory cell. This SRAM cell is constituted with two MOS transistors 10 and 12 and one inverter circuit 14. The source terminal of PMOS transistor 10 is connected to bit line (BL), the drain terminal is connected to data storage node (Na), and the gate terminal is connected to word line (WL). The source terminal of NMOS transistor 12 is connected to a supply voltage terminal that provides low-level reference potential VSS (for example, zero volts), the drain terminal is connected to data storage node (Na), and the gate terminal is connected to the output terminal o inverter circuit 14. The input terminal of inverter circuit 14 is connected to data storage node (Na).
    Type: Application
    Filed: March 21, 2001
    Publication date: October 25, 2001
    Inventors: Yoritaka Saito, Hiroshi Ikeda, Takumi Nasu, Kohsuke Ikeda, Yoshinobu Matsumoto, Satoshi Nakayama, Yasuhito Ichimura
  • Patent number: 5892726
    Abstract: An address decoder with low power consumption of feedthrough current, leakage current, etc. Address bits AY0.sub.0 -AY0.sub.7 are respectively supplied to n-type gate terminals of CMOS transfer gates C.sub.0 -C.sub.7 and the gate terminals of PMOS transistors P.sub.0 -P.sub.7. Inverted address bits AY0.sub.0- -AY0.sub.7- are supplied to p-type gate terminals of the CMOS transfer gates C.sub.0 -C.sub.7. Enable signals AY3.sub.p, AY6.sub.q are respectively input to both input terminals of a NAND circuit 10. The output terminals of NAND circuit 10 are connected to the input terminals of CMOS transfer gates C.sub.0 -C.sub.7. The output terminals of CMOS transfer gates C.sub.0 -C.sub.7 are connected to the input terminals of the drivers D.sub.0 -D.sub.7 and the drain terminals of the PMOS transistors P.sub.0 -P.sub.7 via a node F.sub.0 -F.sub.7. The source terminals of PMOS transistors P.sub.0 -P.sub.7 are connected to a power supply voltage V.sub.cc, for example of 3.3 V. The output terminals of drivers D.sub.
    Type: Grant
    Filed: September 26, 1996
    Date of Patent: April 6, 1999
    Assignees: Texas Instruments Incorporated, Hitachi Ltd.
    Inventors: Yoojoon Moon, Shunichi Sukegawa, Yasuhito Ichimura, Makoto Saeki
  • Patent number: 5831925
    Abstract: A memory circuit includes a bond option circuit 106 having an input and an output, and row control circuitry 100 coupled to the output of the bond option circuit, the row control circuitry including address terminals, A12 and A13. The memory circuit also includes column control circuitry 102 coupled to the output of the bond option circuit, the column control circuitry 102 also including address terminals, A12 and A13. A memory cell array is coupled to the row control and column control circuitry and is arranged in a first plurality of banks of memory cells, the banks being selectable by a combination of address signals on the address terminals of the row control and column control circuitry. In response to a first signal at the input of the bond option circuit 106, the bond option circuit produces a second signal at the output of the bond option circuit that is coupled to the row control 100 and column control 102 circuitry.
    Type: Grant
    Filed: December 2, 1997
    Date of Patent: November 3, 1998
    Assignee: Texas Instruments Incorporated
    Inventors: David R. Brown, Shoji Wada, Kazuya Ito, Yasuhito Ichimura, Ken Saitoh
  • Patent number: 5140182
    Abstract: Electric charge transmit elements (QD) transmit electric charge from a terminal side (NA) to a control electrode side (NB) of the circuit. The voltage at the control electrode side (NB) is raised by a capacitor configuration (CB). Voltage stabilizing elements (QC) are connected in parallel to the electric charge transmit elements between the terminal side and the control electrode side. In transferring the electric charge from the control electrode side (NB) to the other terminal side (NC), the voltage at the control electrode side (NB) is kept higher than the other terminal side (NC). Therefore, because loss of voltage by the electric charge transfer elements (QB) in transferring the electric charge is eliminated, a predetermined voltage is obtained efficiently in a short time, and a highly reliable booster circuit is provided.
    Type: Grant
    Filed: May 10, 1990
    Date of Patent: August 18, 1992
    Assignee: Texas Instruments Incorporated
    Inventor: Yasuhito Ichimura