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US 4,791,319 AGranted
Semiconductor device with redundancy circuit and means for activating same
AssigneeSharp Kabushiki Kaisha
InventorsTomoyuki Tagami, Masaru Nawaki
Life of this patent
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Abstract
A semiconductor device such as a DRAM with many signal line circuits is also provided with a redundancy circuit and is so structured that when one of the signal line circuits is defective and the fuse contained by such a defective signal line circuit is cut off to inactivate it, an input signal which would select the inactivated signal line circuit will automatically select the redundancy circuit.
Claims2
A semiconductor device comprising
- a plurality of signal line circuits each including a selecting line for transmitting a line selecting signal therethrough and a normally closed circuit opening element, and
- a redundancy signal line circuit connected to each of said signal line circuits through a single transistor, said circuit opening element connecting the gate of said transistor in series with said selecting line of said signal line circuit, said device being so structured that a defective one of said signal line circuits can be inactivated by opening said circuit opening element in said defective signal line circuit and that a signal applied to said inactivated signal line circuit serves to activate said redundancy signal line circuit.
Dependencies are inferred from the claim text.