Patent ID: 6781437
Filing Date: 2004-08-24
Classification: G11C

Abstract:
A fuse cell comprising:fuse input terminals for receiving input signals; a fuse output terminal; a control circuit coupled to the input terminals; an initialization circuit coupled to the control circuit; a fuse circuit coupled to the control circuit, the fuse circuit comprising a fuse having a first or a second fuse state; a latch coupled to the fuse output terminal and the control circuit, the latch having first and second latch states, wherein the first latch state causes a fuse output signal to be in a first logic state and the second latch state causes the fuse output signal to be in a second logic state; and a software programmable fuse circuit coupled to the control circuit; and in response to the input signals at the input terminals, the fuse cell operates in an initialization mode or in a first or second mode of fuse cell operation, wherein during initialization, the control circuit couples the initialization circuit to the latch to initialize the latch; in the first mode of operation, the control circuit couples the fuse circuit to the latch, wherein the latch is in either the first or second state depending on the fuse state; and in the second mode of operation, the software programmable fuse circuit causes the fuse output signal to be in either the first or second logic state based on the input signals.