Patents Assigned to Hitachi Device Eng.
  • Semiconductor memory having redundancy
    Patent number: 4733372
    Abstract: Herein disclosed is a bipolar memory having redundancy, which can be produced with a small area. In this semiconductor memory having a body memory for storing data and a spare memory for relief of fault bit of the body memory, a row is selected by cutting fuses in a decoder. Fundamentally signal lines such as word lines are not provided with fuses. Other parts including a power source and a reference voltage source are provided with fuses without decreasing the operating speed accompanied by only a slight increase in the area.
    Type: Grant
    Filed: August 6, 1986
    Date of Patent: March 22, 1988
    Assignees: Hitachi, Ltd., Hitachi Device Eng.
    Inventors: Hiroaki Nanbu, Kunihiko Yamaguchi, Noriyuki Honma, Kazuo Kanetani, Motoaki Matumoto, Kazuhiko Tani, Kenichi Ohata