CMOS SRAM cell
First Claim
1. A semiconductor device having an SRAM cell therein, said SRAM cell comprising:
- a first nMOS region of a semiconductor substrate, said first nMOS region including first and third nMOS transistors therein;
a second nMOS region of the semiconductor substrate having second and fourth nMOS transistors therein;
a pMOS region disposed between said first and second nMOS regions, said pMOS region having first and second pMOS transistors therein, said first to fourth nMOS transistors and said first and second pMOS transistors being formed on the semiconductor substrate;
isolation regions between said first nMOS region and said pMOS region and between said second nMOS region and said pMOS region;
first and second bit lines extending in a direction substantially perpendicular to a longitudinal region extending from said first nMOS region to said second nMOS region;
said SRAM cell further comprisinga word line extending in a direction parallel to said longitudinal region,wherein said first and second nMOS transistors and said first and second pMOS transistors comprise a flip-flop for storing data, wherein said third nMOS transistor forms a first transfer gate connected between the first bit line and the flip-flop, with a gate thereof connected with said word line, and wherein said fourth nMOS transistor forms a second transfer gate connected between said second bit line and said flip-flop with a gate thereof connected with said word line.
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Accused Products
Abstract
An outline of an SRAM cell is rectangular. The SRAM cell have nMOS transistors QN1 and QN3 in a nMOS region 13A being on one side of the longitudinal direction, nMOS transistors QN2 and QN4 in a nMOS region 13B being on the opposite side thereof, pMOS transistors QP1 and QP2 in a central region 12, and isolation regions 14A and 14B being between the regions 13A and 12 and between the regions 13B and 12 respectively. The pMOS transistors QP1 and QP2 are on the nMOS transistor QN1 side and on the nMOS transistor QN2 side respectively within the region 12. The direction of bit lines is perpendicular to the longitudinal direction and the word line is parallel to the longitudinal direction. The nMOS transistors QN1, QN4 and the pMOS transistor QP1 are placed on one side of the regions 13A, 13B and 12 respectively in the direction perpendicular to the longitudinal direction, whereas the nMOS transistors QN3 and QN2 and the pMOS transistor QP2 are placed on the opposite side thereof.
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Citations
14 Claims
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1. A semiconductor device having an SRAM cell therein, said SRAM cell comprising:
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a first nMOS region of a semiconductor substrate, said first nMOS region including first and third nMOS transistors therein; a second nMOS region of the semiconductor substrate having second and fourth nMOS transistors therein; a pMOS region disposed between said first and second nMOS regions, said pMOS region having first and second pMOS transistors therein, said first to fourth nMOS transistors and said first and second pMOS transistors being formed on the semiconductor substrate; isolation regions between said first nMOS region and said pMOS region and between said second nMOS region and said pMOS region; first and second bit lines extending in a direction substantially perpendicular to a longitudinal region extending from said first nMOS region to said second nMOS region;
said SRAM cell further comprisinga word line extending in a direction parallel to said longitudinal region, wherein said first and second nMOS transistors and said first and second pMOS transistors comprise a flip-flop for storing data, wherein said third nMOS transistor forms a first transfer gate connected between the first bit line and the flip-flop, with a gate thereof connected with said word line, and wherein said fourth nMOS transistor forms a second transfer gate connected between said second bit line and said flip-flop with a gate thereof connected with said word line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A semiconductor device, comprising:
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a memory cell array; and a peripheral circuit connected to said memory cell array for performing data write and read operations for said memory cell array, wherein said memory cell array comprises a plurality of CMOS SRAM cells disposed in a lattice configuration, each of said plurality of CMOS SRAM cells comprising a first nMOS region including first and third nMOS transistors therein; a second nMOS region having second and fourth nMOS transistors therein; a pMOS region disposed between said first and second nMOS regions, said pMOS region having first and second pMOS transistors therein; isolation regions between said first nMOS region and said pMOS region and between said second nMOS region and said pMOS region; first and second bit lines extending in a direction substantially perpendicular to a longitudinal region extending from said first nMOS region to said second nMOS region;
said CMOS SRAM cell further comprisinga word line extending in a direction parallel to said longitudinal region, wherein said first and second nMOS transistors and said first and second pMOS transistors comprise a flip-flop for storing data, wherein said third nMOS transistor forms a first transfer gate connected between the first bit line and the flip-flop, with a gate thereof connected with said word line, and wherein said fourth nMOS transistor forms a second transfer gate connected between said second bit line and said flip-flop with a gate thereof connected with said word line. - View Dependent Claims (11, 12, 13, 14)
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Specification