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Electrical fuses memory grid with redundancy backup function and redundancy backup method thereof

A fuse and backup technology, applied in electrical components, circuits, electric solid state devices, etc., can solve the problems of low production yield and density increase, and achieve the effect of increasing production yield and improving production yield.

Active Publication Date: 2008-09-17
TAIWAN SEMICON MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the capacity increases due to updated production technology, such as 0.13um or more precise process, the density of defects will increase and may result in a lower production yield

Method used

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  • Electrical fuses memory grid with redundancy backup function and redundancy backup method thereof
  • Electrical fuses memory grid with redundancy backup function and redundancy backup method thereof
  • Electrical fuses memory grid with redundancy backup function and redundancy backup method thereof

Examples

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Embodiment Construction

[0029] The present invention provides a method and circuit for providing redundant backup for electric fuses.

[0030] figure 2 A fuse unit 200 with 100 percent redundant backup is shown according to a first embodiment of the present invention. Fuse unit 200 includes electrical fuses 202 and 204 . Electrical fuse 204 can be considered as a redundant backup electrical fuse, while electrical fuse 202 can be considered as an original electrical fuse. Electrical fuses 202 and 204 are connected in parallel so that if the original electrical fuse becomes defective, a redundant backup electrical fuse can be used as a replacement fuse. Electrical fuse 202 is connected to a programming device 206 and an output selection device 208 , while electrical fuse 204 is connected to a programming device 210 and an output selection device 212 . Devices 206, 208, 210, and 212 are shown as thick oxide NMOS transistors, however they are not limited to the designs shown, and other known designs ...

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PUM

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Abstract

The present disclosure provides an electrical fuse cell with redundancy features and the method for operating the same. The fuse cell includes a first set of electrical fuses having at least one electrical fuse contained therein, and a second set of electrical fuses having at least one electrical fuse for providing redundancy to at least one fuse of the first set, wherein if one of the first set of electrical fuses is defective, at least one of the second set of the electrical fuses can be programmed to provide a redundancy function of the defective fuse.

Description

technical field [0001] The present invention relates to an integrated circuit design, and more particularly to a method and apparatus for providing redundant backup for electrical fuses of an integrated circuit design. Background technique [0002] When a current passing through the fuse exceeds a threshold, the electric fuse is blown. Because the state of the burnt fuse cannot be restored, it can provide the function of data storage that does not change due to power failure. Proper placement of electrical fuses can provide more flexibility in the design, such as placing the fuses in the die, because the wiring is allowed to be placed on the metal layer and under the fuses. This placement advantage makes e-fuse a valuable component in high density memory devices. [0003] However, some electrical fuses may be defective. Because of these defects, electrical fuses are often not programmed correctly. When these fuses are not programmed correctly in digital circuits, there w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11C17/16G11C29/00
CPCG11C17/16G11C17/14G11C29/816H01L23/5256G11C29/846H01L2924/0002H01L2924/00
Inventor 庄建祥
Owner TAIWAN SEMICON MFG CO LTD