Patent ID: 6657531
Filing Date: 2003-12-02
Classification: G11C,H01L

Abstract:
A fuse circuit, comprising:electrical fuse elements which are commonly connected at one-side ends; a voltage generating section which is configured to selectively apply program voltage for destroying the electrical fuse element and read voltage for reading out destructive/nondestructive states of said electrical fuse elements to a common connection node of the one-side ends of said electrical fuse elements; and a readout section which is configured to read out the destructive/nondestructive states of said electrical fuse elements from the other ends of said electrical fuse elements when the read voltage is applied to the common connection node from said voltage generating section; wherein said electrical fuse elements are capacitors, one electrode of each of the capacitors being formed of a well region in a semiconductor substrate and commonly used by the capacitors, the program voltage is applied to the well region from said voltage generating section when at least one of the capacitors is dielectrically broken down and programmed, and the read voltage is applied to the well region from said voltage generating section at least when the destructive/nondestructive state of the capacitor is read out.