Patent ID: 8134854
Filing Date: 2012-03-13
Classification: H01H,H01L

Abstract:
1. An efuse device operating in a write mode and a read mode and comprising: a source line; a cell having a first terminal coupled to the source line and a second terminal; a blow device coupled between the second terminal of the cell and a ground terminal, wherein the blow device is turned on in the read mode; and a sensing circuit, coupled to the first terminal of the cell and the ground terminal, for determining a state of the cell, wherein the sensing circuit further comprises: an isolation unit coupled between the first terminal of the cell and a first terminal of a reference resistor, wherein the isolation unit is turned off in the write mode and on in the read mode; a pre-charging unit having first and second input nodes and coupled to the isolation unit, wherein the pre-charging unit charges voltages at the first and second nodes to a predetermined level before the isolation unit is turned on, and the first and second input nodes respectively receive a first voltage of the first terminal of the cell and a second voltage of the first terminal of the reference resistor when the isolation unit is turned on; an amplifying unit coupled to the first and second input nodes of the pre-charging unit and amplifying the first and second voltages; and an output unit receiving the amplified first and second voltages and outputting an output signal according to the amplified first and second voltages.