Electrical fuse circuit
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsShinichi Sumi, Yasuhiro Agata, Masanori Shirahama, Toshiaki Kawasaki, Ryuji Nishihara
Life of this patent
Estimating the term…
Abstract
An electrical fuse circuit of the present invention includes a plurality of electrical fuse cores (1) each of which has an electrical fuse element (3) and a switch transistor (4) connected in series with each other, and shift registers (2) connected to the plurality of electrical fuse cores (1) to program the electrical fuse elements (3). Program enable signals (Si) are sequentially generated and transferred by the shift registers (2), the switch transistors (4) are sequentially brought into conduct according to the program enable signals (Si) and the information of program data (Di), and the electrical fuse elements (3) are blown one by one.
Claims8
An electrical fuse circuit, comprising:
- a plurality of fuse cores each having a fuse element and a switch transistor connected in series with the fuse element, an end of the fuse opposite the switch transistor for receiving a fixed voltage from a voltage source, and
- shift registers connected to the plurality of fuse cores for programming the fuse elements, wherein
- the shift registers are for generating program enable signals, and
- the plurality of fuse cores are for receiving data for programming, activating the switch transistors, and programming the fuse elements according to the program enable signals from the shift registers and data for programming.
An electrical fuse circuit, comprising:
- a plurality of fuse cores each having a fuse element and a switch transistor connected in series with the fuse element, and
- shift registers connected to the plurality of fuse cores for programming the fuse elements, wherein
- the shift register of a first stage has an input fixed at H or L, and each of the shift registers comprises a DFF circuit for operating in synchronization with a program clock signal and a unit for generating a program enable signal to enable the programming in response to a change of an internal signal of the DFF circuit, the change occurring in a process where the DFF circuit sequentially transmits the input of the first stage in synchronization with the program clock signal, and
- the plurality of fuse cores for sequentially activating the switch transistors for programming the fuse elements according to the program enable signals from the shift registers and data information for the programming.
The An electrical fuse circuit comprising:
- a plurality of fuse cores each having a fuse element and a switch transistor connected in series with the fuse element, and
- shift registers connected to the plurality of fuse cores for programming the fuse elements.
- wherein the shift registers are for generating program enable signals, and
- the plurality of fuse cores are for activating the switch transistors and programming the fuse elements according to the program enable signals from the shift registers and data information for the programming,
- wherein the plurality of fuse cores are each divided into a plurality of blocks and an input of the program enable signal is shared by each of the blocks, the shift registers are for sequentially inputting the program enable signals to the plurality of blocks in a process of transferring the generated program enable signals, and the plurality of fuse cores are for activating the switch transistors in response to the input of the program enable signal to each of the blocks.
Dependencies are inferred from the claim text.