Read only memory device with memory cells each storing one of three states
First Claim
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1. A read only memory device comprising:
- a plurality of memory cells each storing one of three states;
a cell voltage generating circuit connected to said plurality of memory cells for providing a cell voltage corresponding to the state stored in a selected one of said plurality of memory cells;
a reference cell provided for said plurality of memory cells for providing a reference voltage which is substantially the same as the cell voltage provided by a memory cell storing an intermediate state of the three states; and
a comparator circuit connected to said cell voltage generating circuit and said reference cell for generating a logical output signal based on the result of a comparison between the cell voltage and the reference voltage.
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Abstract
A ROM device includes a plurality of memory cells each storing one of three states, a cell voltage generating circuit for providing a cell voltage corresponding to the state stored in a selected one of the memory cells, and a reference cell for providing a reference voltage which is substantially the same as the cell voltage provided by a memory cell storing an intermediate state of the three states. The ROM also includes a comparator circuit for generating a logical output signal based on the result of a comparison between the cell voltage and the reference voltage.
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Citations
5 Claims
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1. A read only memory device comprising:
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a plurality of memory cells each storing one of three states; a cell voltage generating circuit connected to said plurality of memory cells for providing a cell voltage corresponding to the state stored in a selected one of said plurality of memory cells; a reference cell provided for said plurality of memory cells for providing a reference voltage which is substantially the same as the cell voltage provided by a memory cell storing an intermediate state of the three states; and a comparator circuit connected to said cell voltage generating circuit and said reference cell for generating a logical output signal based on the result of a comparison between the cell voltage and the reference voltage. - View Dependent Claims (2, 3, 4, 5)
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Specification