Patent ID: 6686790
Filing Date: 2004-02-03
Classification: G11C

Abstract:
A method of programming an integrated circuit comprising:providing an enable signal having a non-enable state and an enable state; providing a programming signal having a programming state and a non-programming state; providing a first power supply which is switchable between a first bus voltage and a VCC voltage; providing a second power supply which is switchable between a second bus voltage and a ground voltage; programming exactly one anti-fuse of a first anti-fuse and a second anti-fuse interposed between the first power supply and the second power supply based on switched states of both the first voltage supply and the second voltage supply and the programming signal being in the programming state, thereby substantially eliminating standby current between the first power supply and the second power supply; and providing a programmed signal from a programmable circuit, wherein the programmed signal has a first potential from the first power supply in response to the enable signal being in the enable state, the first anti-fuse being programmed and the second anti-fuse being unprogrammed, and the programmed signal has a second potential from the second power supply in response to the enable signal being in the enable state, the second anti-fuse being programmed and the first anti-fuse being unprogrammed; wherein the programmed signal assumes a determined potential when exactly one of the first anti-fuse and the second anti-fuse is programmed.