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Semiconductor memory circuit having switched voltage supply for data bus lines

  • US 5,199,000 A
  • Filed: 03/27/1991
  • Issued: 03/30/1993
  • Est. Priority Date: 03/27/1990
  • Status: Expired due to Fees
First Claim
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1. A semiconductor memory circuit comprising a plurality of memory cells each connected to a corresponding word line and a corresponding pair of digit lines, said pair of digit lines being connected through a switch circuit to a corresponding pair of data bus lines, which are in turn connected to a sense amplifier, the semiconductor memory circuit also including a voltage supply circuit composed of circuit elements having the same characteristics as that of circuit elements included in a circuit for determining a potential on said pair of data bus lines when said pair of digit lines and said pair of data bus lines are selected, said voltage supply circuit operating to generate, on the basis of the potential on said pair of data bus lines when said pair of digit lines and said pair of data bus lines are selected, a voltage to be applied to said pair of data bus lines when said pair of digit lines and said pair of data bus lines are not selected, the voltage generated by said voltage supply circuit being supplied to said pair of digit lines or said pair of data bus lines through another switch circuit which is turned on when said pair of digit lines and said pair of data bus lines are not selected.

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