Patents Assigned to Hitachi VLSI Engineering Corp.
  • Patent number: 5126821
    Abstract: According to the present invention, as improvement in the adhesion of inner leads with a packaging resin in a resin-sealed semiconductor device is attained by spreading leads on or near the circuit-forming face of a pellet, or on or near the main non-circuit-forming face of the pellet to extend the lengths of the inner leads on or under the pellet.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: June 30, 1992
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Takayuki Okinaga, Hiroshi Tachi, Hiroshi Ozaki, Kanji Otsuka, Michiaki Furukawa, Yasuyuki Yamasaki
  • Patent number: 5111080
    Abstract: A signal transmission circuit in which a signal is converted into two complementary signals which are outputted from a signal transmission circuit via series resistors. The amplitude of each of the complimentary signals is reduced by the series resistors and terminating resistors provided on a signal receiving side. The signal receiving side shifts the level of the signals which it inputs. The level shifted signals are amplified by a high-input impedance differential amplifying circuit.
    Type: Grant
    Filed: November 13, 1990
    Date of Patent: May 5, 1992
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Masao Mizukami, Yoichi Sato
  • Patent number: 5107329
    Abstract: A semiconductor device of pin-grid array (PGA) type, which is adapted for surface-mounting on a printed circuit board, has lead pins arranged in a grid and standing perpendicularly on a base of the semiconductor device. In addition, a few pins are provided which are longer than said lead pins in said grid. When the device is placed on the printed circuit board for mounting, the longer pins are inserted into through-holes which are respectively formed in the printed circuit board to correspond to the position of the longer pins of the device. Thus, the tip of the lead pins are accurately positioned on the top of lands on the printed circuit board, respectively, and the lead pins do not get out of position during the mounting operation.
    Type: Grant
    Filed: February 27, 1989
    Date of Patent: April 21, 1992
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Takayuki Okinaga, Kanji Otsuka, Hiroshi Akasaki
  • Patent number: 5105389
    Abstract: Means for changing-over address signals is provided in an address input portion, and the order of the signals to be input to an address decoder is changed according to external control signals. Alternatively, a reading output circuit is provided which reads data in bit unit different from that of the writing input circuit. Thus, data can be read and written even when the number of bits of data differs between in case of accessing a built-in memory of an LSI inside the LSI and in case of accessing it from outside the LSI.
    Type: Grant
    Filed: December 4, 1990
    Date of Patent: April 14, 1992
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Akinori Matsuo, Masashi Watanabe, Michio Fujimoto, Masashi Wada, Yoshiharu Nagayama, Kazuo Naito
  • Patent number: 5097446
    Abstract: A time circuit is provided for a nonvolatile memory device which can electrically be written into. When the write operation on a particular memory cell lasting a relatively long period of time is specified from an external device, the memory device stops the write operation on that memory cell, irrespective of the external write operaiton specification, when the time set on the timer circuit has elapsed. The nonvolatile memory device has memory cells, each consisting of a single transistor. The erase operation on the memory cells is controlled according to a current flowing through these memory cells.
    Type: Grant
    Filed: May 23, 1989
    Date of Patent: March 17, 1992
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Kazuyoshi Shoji, Takaaki Hagiwara, Tadashi Muto, Shun-ichi Saeki, Yasurou Kubota, Kazuto Izawa, Yoshiaki Kamigaki, Shin-ichi Minami, Yuko Nabetani
  • Patent number: 5090609
    Abstract: An invention relating to a technique for producing a chip mount type package or a TAB package with high reliability, without use of a flux which would cause environmental pollution or would hinder an enhancement of reliability, and more particularly pertaining to a method of irradiating bonding surfaces, for which a solder is used, and solder bump electrodes of a package with an atomic or ion energy beam and bonding the bonding surfaces to each other under normal pressure (about 1 atm) in a continuous apparatus.
    Type: Grant
    Filed: April 26, 1990
    Date of Patent: February 25, 1992
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Takashi Nakao, Yoshiaki Emoto, Koichiro Sekiguchi, Masayuki Iketani, Kunizo Sahara, Ikuo Yoshida, Akiomi Kohno, Masaya Horino, Hideaki Kamohara, Shouichi Irie, Hiroshi Akasaki, Kanji Otsuka
  • Patent number: 5080039
    Abstract: A processing apparatus includes a processing chamber and an insertion jig for inserting an object to be processed into the processing chamber. The processing chamber and the insertion jig are adapted to be individually movable relative to a heating section, so that the operation of loading and unloading the object into and from the processing chamber effected by the insertion jig is conducted outside the heating section, thereby preventing the outside air from being induced to enter the heated processing chamber, together with the object of the processing, and thus avoiding the occurrence of various problems, for example, the object of processing being disorderly oxidized by the oxygen contained in the outside air, and the foreign matter contained in the outside air being undesirably attached to the surface of the object, so as to obtain excellent processing results.
    Type: Grant
    Filed: June 8, 1990
    Date of Patent: January 14, 1992
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp., Hitachi Tokyo Electronics Co., Ltd.
    Inventors: Masatomo Kanegae, Takayoshi Kogano, Fumio Ito
  • Patent number: 5067007
    Abstract: Attempts have been made to increase the number of pins of packages accompanying the trend toward fabricating integrated circuits highly densely and in smaller sizes. The present invention provides technology for improving reliability in fabricating packages of the surface-mounted type that have increased number of pins. That is, when the packages are mounted on the wiring substrate, the lead pins that receive load from the axial direction exhibit bending strength which is smaller than the junction strength of solder at the junction portions. To achieve this object, the lead pins are made of a material having large resiliency such as a fiber-reinforced material, a transformation pseudo elastic material, an ultra-high tension material, or a heat-resistant ultra-high tension material.
    Type: Grant
    Filed: January 24, 1991
    Date of Patent: November 19, 1991
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Kanji Otsuka, Masao Kato, Takashi Kumagai, Mitsuo Usami, Shigeo Kuroda, Kunizo Sahara, Takeo Yamada, Seiji Miyamoto, Yuuji Shirai, Takayuki Okinaga, Kazutoshi Kubo, Hiroshi Tachi, Masayuki Kawashima
  • Patent number: 5065363
    Abstract: Each memory cell of the memory array has a latch circuit, such as a pair of cross-connected CMOS inverters, for storing information, a first switch MOSFET whose gate is connected with a word line, and a second switch MOSFET which is connected in series with the first switch MOSFET and the gate of which is connected with the output terminal of the latch circuit. The first and second switch MOSFETs are coupled between the data line and a terminal supplied with a first power source voltage level, such as reference ground potential. Such memory cells are disposed at intersections of a plurality of data lines and a plurality of word lines. One of the plurality of data lines is connected with a common data line through a column switch which is alternatively brought into an ON state.
    Type: Grant
    Filed: January 7, 1991
    Date of Patent: November 12, 1991
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Yoichi Sato, Masao Mizukami
  • Patent number: 5032895
    Abstract: A semiconductor device comprising the fact that a semiconductor pellet is arranged on a substantially central part of a film base in which a metal plate is overlaid with an insulating member, while inner leads are arranged on a peripheral part of the film base in a state in which they are electrically isolated from the metal plate of the film base, and that external terminals for a power source among external terminals of the semiconductor pellet and middle parts of the metal plate of the film base, and inner leads for the power source among the inner leads and peripheral parts of the metal plate are electrically connected by pieces of bonding wire, respectively.
    Type: Grant
    Filed: April 18, 1990
    Date of Patent: July 16, 1991
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Osamu Horiuchi, Gen Murakami, Hiromichi Suzuki, Hajime Hasebe, Kanji Otsuka, Yuuji Shirai, Takayuki Okinaga, Takashi Emata
  • Patent number: 5025422
    Abstract: A static random access memory device is provided with an internal activation signal generator and circuit means for overriding application of the internal activation signals to the memory circuit under predetermined circumstances. In normal read/write operation modes, word lines and a sense amplifier are activated only during a predetermined period in response to the internal activation signals in order to reduce power consumption. On the other hand, in a test mode, since the circuit means detects a higher voltage level of a predetermined external terminal of the device, the internal activation signals from the pulse generator are not used to limit the operating time of the word lines and sense amplifier. Therefore, during the test mode, the word lines and the sense amplifier are activated for a longer period than during the normal read/write operation mode. Because of this, the device is able to shorten aging time which occurs in the test mode.
    Type: Grant
    Filed: October 10, 1989
    Date of Patent: June 18, 1991
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Nobuyuki Moriwaki, Mitsuhiro Higuchi, Mitsuhiro Toshita
  • Patent number: 5022000
    Abstract: A writing high voltage of one polarity or an erasing high voltage of another polarity is selectively fed, in accordance with a writing or erasing operation mode, via a switch MOSFET to the word line of a non-volatile memory element designated by an address signal. The potential of a well region, where the switch MOSFET is existent, is changed in conformity with the switching action of the relevant switch MOSFET so as to control the switch MOSFET. Due to this arrangement, the potential of the well region with the non-volatile memory elements existing thereon can be retained at a fixed value, so that the high voltage generator is required merely to drive the selected word line of the memory array (and not the well in which the memory elements are formed). Consequently, the requisite current supply capability of the high voltage generator can be diminished.
    Type: Grant
    Filed: September 6, 1989
    Date of Patent: June 4, 1991
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Masaaki Terasawa, Hidefumi Mukohda, Yoshikazu Nagai, Yasunori Ikeda, Kazunori Furusawa
  • Patent number: 5018004
    Abstract: A semiconductor chip package technology which uses thin film wiring from the chip to the package terminals for increased line density and decreased parasitic capacitance and uses a thin film adhesion layer for improved heat conductivity between the package substrate and its sealing cap. The package uses a thin conductor film deposited along the element mounting surface of a sintered substrate. An adhesion layer, to provide a high quality bond between the sealing cap and substrate, is then deposited on the substrate peripheral area by successively laminating metal and metallized layers, or by depositing a single layer of low metal glass. The adhesion layer is thinner and of larger area than thick film technology, for improved heat conduction.
    Type: Grant
    Filed: November 28, 1989
    Date of Patent: May 21, 1991
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Takayuki Okinaga, Shouji Matsugami, Yuuji Shirai, Kanji Otsuka, Hiroshi Koguma, Takashi Emata
  • Patent number: 5018101
    Abstract: A semiconductor memory wherein an operating mode is selectively set by effecting bonding with respect to predetermined pads provided on a common semiconductor substrate in a predetermined combination or by cutting off predetermined fuse means provided on the common semiconductor substrate in a predetermined combination and a bit pattern is selectively set by changing a part of a photomask applied to the common semiconductor substrate.
    Type: Grant
    Filed: August 31, 1990
    Date of Patent: May 21, 1991
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Kazuhiko Kajigaya, Hiroaki Kotani, Kazuyoshi Oshima, Yasuhiro Kasama, Shinji Udo
  • Patent number: 4989185
    Abstract: A memory area within a semiconductor integrated circuit device is accessible through an address changeover circuit. External control signals instruct the memory device as to the addressing mode desired. Address signals originating externally are provided directly to the IC's address decoder circuits, while addresses originating internal to the IC are first shifted one or two bits to modify the address by a power of 2, then provided to the address decoder circuits. In this way, data of bit length N may be written to a memory array of bit length M, where M>N.
    Type: Grant
    Filed: July 15, 1988
    Date of Patent: January 29, 1991
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Akinori Matsuo, Masashi Watanabe, Michio Fujimoto, Masashi Wada, Yoshiharu Nagayama, Kazuo Naito
  • Patent number: 4984204
    Abstract: A semiconductor memory device has a sense amplifier which is constructed with a level shift circuit having an input which senses the change in a data line from an initial precharged level to a level near the vicinity of the supply voltage level which corresponds to data reading amounts from a memory cell during the reading mode of operation of the memory. The level shift circuit, in response to a memory cell reading signals, provides a level shifted output to the input terminal of a differential sense amplifier circuit, the level shifted output being in the vicinity of the operating point of the differential sense amplifier circuit. The level shift circuit includes a current amplifier having an output terminal that is formed with a series connecting node of a current amplifying transistor and a current source.
    Type: Grant
    Filed: January 30, 1989
    Date of Patent: January 8, 1991
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Yoichi Sato, Masao Mizukami, Toshiyuki Ookuma
  • Patent number: 4984201
    Abstract: Each memory cell of the memory array has a latch circuit, such as a pair of cross-connected CMOS inverters, for storing information, a first switch MOSFET whose gate is connected with a word line, and a second switch MOSFET which is connected in series with the first switch MOSFET and the gate of which is connected with the output terminal of the latch circuit. The first and second switch MOSFETs are coupled between the data line and a terminal supplied with a first power source voltage level, such as reference ground potential. Such memory cells are disposed at intersections of a plurality of data lines and a plurality of word lines. One of the plurality of data lines is connected with a common data line through a column switch which is alternatively brought into an ON state.
    Type: Grant
    Filed: January 16, 1990
    Date of Patent: January 8, 1991
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Yoichi Sato, Masao Mizukami
  • Patent number: 4983975
    Abstract: An A/D converter included in an echo canceller or the like is furnished with a plurality of rate changing filters that receive the output signals of an oversampling A/D conversion circuit in common, the integration phases of the filters are different from each other as they are selectively advanced or retarded for each one of a plurality of predetermined intervals, and further furnished with an output selection circuit by which internal digital signals delivered as outputs from one of the rate changing filters are selectively transmitted according to the desired phase change.
    Type: Grant
    Filed: March 31, 1989
    Date of Patent: January 8, 1991
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Kimihiro Sugino, Mitsumasa Satoh
  • Patent number: 4965653
    Abstract: The present invention discloses a suitable mounting of a wafer scale LSI (wafer scale integration) (WSI) in which a slit formed in a wafer is fit to a connector, a U-shaped reinforcing rubber member is disposed at the circumferential edge of the wafer, or a flexible adhesive is used for bonding a substrate formed with through-holes and a wafer, to provide a WSI mounting structure of high integration degree and high reliability. Furthermore, a method of efficient mounting by conducting the wiring of the wafer and the connection with the external terminal of the chip in one identical production step is disclosed.
    Type: Grant
    Filed: February 28, 1990
    Date of Patent: October 23, 1990
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp.
    Inventors: Kanji Otsuka, Shigeo Kuroda, Katsuyuki Sato, Hisashi Nakamura, Shinichi Shouji
  • Patent number: 4957781
    Abstract: A processing apparatus includes a processing chamber and an insertion jig for inserting an object to be processed into the processing chamber. The processing chamber and the insertion jig are adapted to be individually movable relative to a heating section, so that the operation of loading and unloading the object into and from the processing chamber effected by the insertion jig is conducted outside the heating section, thereby preventing the outside air from being induced to enter the heated processing chamber, together with the object of the processing, and thus avoiding the occurrence of various problems, for example, the object of processing being disorderly oxidized by the oxygen contained in the outside air, and the foreign matter contained in the outside air being undesirably attached to the surface of the object, so as to obtain excellent processing results.
    Type: Grant
    Filed: June 2, 1988
    Date of Patent: September 18, 1990
    Assignees: Hitachi, Ltd., Hitachi VLSI Engineering Corp., Hitachi Tokyo Electronics Co.
    Inventors: Masatomo Kanegae, Takayoshi Kogano, Fumio Ito