Patent ID: 8848475

Claim:
A fuse circuit comprising: a program unit configured to be programmed in response to a program signal and configured to output a program output signal in response to a sensing enable signal; and a sensing unit configured to output a sensing output signal based on the program output signal, the sensing output signal indicating whether the program unit is programmed or not, the program unit comprising: an anti-fuse cell including at least two anti-fuse elements which are connected in parallel and are respectively broken down at different levels of a program voltage, the anti-fuse cell including a first node and a second node, the first node receiving the program voltage; a selection transistor, connected between the second node and a connection node, the selection transistor having a gate which receives a selection signal; a program transistor, connected between the connection node and a ground voltage, the program transistor having a gate which receives the program signal; and a sensing transistor which has a first terminal connected to the connection node, a gate receiving the sensing enable signal and a second terminal providing the program output signal.