Patent ID: 6100748
Filing Date: 2000-08-08
Classification: G11C

Abstract:
A redundant circuit for a semiconductor device, comprising:a) fuse program means for producing a control signal indicating whether a chip is normal or abnormal;b) high-voltage generating means for producing, in accordance with the control signal:1) a first voltage responsive to a logic high indication, when the chip is normal, and2) a second voltage that is higher than the first voltage, when a memory cell in the chip has failed so as to render the chip abnormal;said high-voltage generating means including,a high-voltage level detector for sensing a voltage level of a voltage produced by the high-voltage generating means;a ring oscillator for receiving a signal output from the high-voltage level detector and for producing an oscillation signal;a charge pump for generating the second voltage in response to the oscillation signal; andc) on-chip redundant decoding means, driven by the first voltage or the second voltage, for providing an output that selects a redundant memory cell.