US Patent No: 5,550,781

Number of patents in Portfolio can not be more than 2000

Semiconductor apparatus with two activating modes of different number of selected word lines at refreshing

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Abstract

A memory cartridge having a plurality of dynamic memory units includes an access conversion circuit which converts a static access signal into its inverted signal and an access control circuit which controllably switches between a signal for refreshing each dynamic unit and a signal for external access. The memory cartridge also includes a power switching circuit which switches power from an internal power supply to an external power supply when the memory cartridge is mounted to an external device.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
HITACHI, LTD.TOKYO32320
HITACHI MAXELL, LTD.OSAKA875

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kimura, Katsutaka Akishima, JP 113 1395
Matoba, Mikio Yuki-gun, JP 4 84
Sakairi, Shigeru Tsukuba, JP 4 84
Sasaki, Toshio Tokyo, JP 161 1729
Shimohigashi, Katsuhiro Musashimurayama, JP 59 1474
Sugawara, Ken Hachioji, JP 10 113

Cited Art

Patent Info (Count) # Cites Year
 
DALLAS SEMICONDUCTOR CORPORATION (2)
4,908,790 Backup battery switching circuitry for a microcomputer or a microprocessor 57 1988
4,977,537 Dram nonvolatizer 59 1988
 
DATA GENERAL CORPORATION (1)
4,316,248 Memory refresh means including means for providing refresh addresses during power failures 12 1979
 
DELL USA, L.P. (1)
5,241,643 Memory system and associated method for disabling address buffers connected to unused SIMM slots 28 1990
 
HILTI AKTIENGESELLSCHAFT (1)
4,921,381 Expansion dowel assembly and method of anchoring the assembly 6 1988
 
HITACHI, LTD. (1)
4,802,135 Semiconductor memory having multiple continuous access functions 23 1986
 
INTERNATIONAL COMPUTERS LIMITED (1)
4,901,283 Dynamic random-access memory system with power-up and power-down refresh circuits 47 1988
 
KABUSHIKI KAISHA TOSHIBA (1)
4,819,207 High-speed refreshing rechnique for highly-integrated random-access memory 21 1987
 
NEC ELECTRONICS CORPORATION (1)
4,954,993 Semiconductor integrated circuit having a plurality of circuit blocks respectively supplied with power from different power sources 5 1988
 
NIPPON ELECTRIC CO., LTD. (1)
4,334,295 Memory device 42 1980
 
SHARP KABUSHIKI KAISHA (1)
4,313,180 Refresh system for a dynamic memory 15 1980
 
SONY CORPORATION (1)
5,046,052 Internal low voltage transformation circuit of static random access memory 59 1989
 
U.S. PHILIPS CORPORATION (1)
5,283,885 Storage module including a refresh device for storing start and stop refresh addresses 42 1992

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
GOOGLE INC. (24)
8,359,187 Simulating a different number of memory circuit devices 0 2006
8,077,535 Memory refresh apparatus and method 0 2006
8,340,953 Memory circuit simulation with power saving capabilities 0 2006
8,280,714 Memory circuit simulation system and method with refresh capabilities 0 2006
8,055,833 System and method for increasing capacity, performance, and flexibility of flash storage 2 2006
8,089,795 Memory module with memory stack and interface with enhanced capabilities 0 2007
8,090,897 System and method for simulating an aspect of a memory circuit 1 2007
8,041,881 Memory device with emulated characteristics 0 2007
8,060,774 Memory systems and memory modules 1 2007
8,080,874 Providing additional space between an integrated circuit and a circuit board for positioning a component therebetween 1 2007
8,244,971 Memory circuit system and method 1 2007
8,112,266 Apparatus for simulating an aspect of a memory circuit 0 2007
8,327,104 Adjusting the timing of signals associated with a memory system 0 2007
8,130,560 Multi-rank partial width memory modules 2 2007
8,111,566 Optimal channel design for memory devices for providing a high-speed memory interface 2 2007
8,386,722 Stacked DIMM memory interface 0 2008
8,438,328 Emulation of abstracted DIMMs using abstracted DRAMs 0 2009
8,335,894 Configurable memory system with interface circuit 0 2009
8,213,205 Memory system including multiple memory stacks 0 2009
8,154,935 Delaying a signal communicated from a system to at least one of a plurality of memory circuits 0 2010
8,169,233 Programming of DIMM termination resistance values 0 2010
8,122,207 Apparatus and method for power management of memory circuits by a system or component thereof 0 2010
8,181,048 Performing power management operations 0 2010
8,370,566 System and method for increasing capacity, performance, and flexibility of flash storage 0 2011
 
FUJITSU SEMICONDUCTOR LIMITED (3)
6,014,339 Synchronous DRAM whose power consumption is minimized 69 1997
6,529,435 Semiconductor memory device 4 2001
6,876,587 Semiconductor memory device 2 2003
 
GENESYS LOGIC, INC. (1)
7,778,101 Memory module and method of performing the same 0 2008
 
KABUSHIKI KAISHA TOSHIBA (1)
7,266,034 Data recording device 2 2006
 
METARAM (1)
8,386,833 Memory systems and memory modules 0 2011
 
MOSAID TECHNOLOGIES INCORPORATED (1)
6,822,920 SRAM-compatible memory device employing DRAM cells 0 2003
 
NEC CORPORATION (1)
7,982,505 Logic circuit, address decoder circuit and semiconductor memory 0 2007
 
SAMSUNG ELECTRONICS CO., LTD. (1)
5,771,198 Source voltage generating circuit in semiconductor memory 2 1996
 
SEIKO EPSON CORPORATION (1)
6,501,699 Refresh control for semiconductor memory device 5 2001
 
SILICON STORAGE TECHNOLOGY, INC. (1)
6,735,139 System and method for providing asynchronous SRAM functionality with a DRAM array 4 2001
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (1)
8,446,781 Multi-rank partial width memory modules 0 2012