Semiconductor integrated circuit
DCFirst Claim
1. A semiconductor integrated circuit comprising:
- a plurality of MOS logic circuits formed in a rectangular region over a semiconductor substrate;
a main power supply line provided along a long side of the rectangular region at a peripheral part of the rectangular region;
a plurality of sub-power lines arranged in a direction perpendicular to said main power supply line in the rectangular region; and
a plurality of switching MOS transistors for respectively connecting said sub-power supply lines to said main power supply line,wherein said switching MOS transistors are kept off in an operation stop state of said MOS logic circuits connected to said sub-power supply lines,wherein said switching MOS transistors are kept on in an operable state of said MOS logic circuits connected to said sub-power supply lines, andwherein said switching MOS transistors are so arranged as to be covered with said main power supply line.
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Abstract
It is possible to reduce the voltage drop on sub-power supply lines for reducing the subthreshold current and thereby prevent the operating speed of a logic circuit from lowering. Main power supply lines are arranged along one side of a rectangular region including a MOS logic circuit whose subthreshold current must be reduced, and a plurality of sub-power supply lines are arranged on the region in the direction perpendicular to the main power supply lines. A plurality of switching MOS transistors for selectively electrically connecting the sub-power supply lines to the main power supply line are dispersedly arranged with respect to the main power supply line. By dispersedly arranging the switching MOS transistors with respect to the main power supply line, it is possible to reduce the equivalent resistance of the sub-power supply lines compared to the case where switching MOS transistors are provided at one place.
70 Citations
17 Claims
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1. A semiconductor integrated circuit comprising:
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a plurality of MOS logic circuits formed in a rectangular region over a semiconductor substrate; a main power supply line provided along a long side of the rectangular region at a peripheral part of the rectangular region; a plurality of sub-power lines arranged in a direction perpendicular to said main power supply line in the rectangular region; and a plurality of switching MOS transistors for respectively connecting said sub-power supply lines to said main power supply line, wherein said switching MOS transistors are kept off in an operation stop state of said MOS logic circuits connected to said sub-power supply lines, wherein said switching MOS transistors are kept on in an operable state of said MOS logic circuits connected to said sub-power supply lines, and wherein said switching MOS transistors are so arranged as to be covered with said main power supply line. - View Dependent Claims (2, 3)
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4. A semiconductor integrated circuit comprising:
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a main power supply line extending in a first direction; a plurality of sub-power supply lines extending in a second direction perpendicular to said first direction; and switching MOS transistors for respectively connecting said sub-power supply lines to said main power supply line, wherein said switching MOS transistors are so arranged as to be covered with said main power supply line, wherein said switching MOS transistors are kept off in an operation stop state of said MOS logic circuits, and wherein said switching MOS transistors are kept on in an operable state of said MOS logic circuits to which electric power is supplied through said sub-power supply lines.
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5. A semiconductor integrated circuit comprising:
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a plurality of MOS logic circuits formed over a semiconductor substrate; a plurality of first sub-power supply lines extending in a first direction; a plurality of second sub-power supply lines, each connected at intersection portions to said first sub-power supply lines, said second sub-power supply lines extending in a second direction crossing to said first direction; a main power supply line extending in said second direction; and a plurality of first switching MOS transistors for connecting said first sub-power supply lines to said main power supply line extending in said second direction, wherein said first switching MOS transistors are kept off in an operation stop state of said MOS logic circuits, wherein said first switching MOS transistors are kept on in an operable state of said MOS logic circuits, and wherein said first switching MOS transistors are so arranged as to be covered with said main power supply line extending in said second direction. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A semiconductor integrated circuit comprising:
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a plurality of memory mats including plural memory cells each having a selection terminal connected to a word line and being arranged like an array; word drivers for selectively driving the word lines, regularly provided between said memory mats arranged like an array; a plurality of MOS logic circuits for supplying a word-line driving voltage to said word drivers, regularly provided between said memory mats arranged like an array; first sub-power supply lines, extending in a first direction, connected to power supply terminals of said MOS logic circuits, second sub-power supply lines, extending in a second direction perpendicular to said first direction, said second sub-power supply lines being connected to said first sub-power supply lines at intersection portions thereof; a main power supply line extending in said second direction; and a plurality of switching MOS transistors for connecting said power supply terminals to said main power supply line, wherein said switching MOS transistors are kept off in a standby state of said MOS logic circuits and kept on in an operable state of the MOS logic circuits, and wherein said switching MOS transistors are so arranged as to be covered with said main power supply line. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification