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US 6,686,747 B2Granted
Programmable voltage divider and method for testing the impedance of a programmable element
AssigneeMicron Technology, Inc.
InventorDonald M. Morgan
Life of this patent
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AssigneeMicron Technology, Inc.
InventorDonald M. Morgan
Estimating the term…
A programmable voltage divider has normal and test modes of operation. The divider includes first and second supply nodes, a divider node that provides a data value, and a first divider element that is coupled between the first supply node and the divider node. The divider also includes a controlled node, a second divider element that has a selectable resistivity and that is coupled between the divider node and the controlled node, and a test circuit that is coupled between the controlled node and the second supply node. During the normal mode of operation, the first and second divider elements generate the data value having a first logic level when the second divider element has a first resistivity, and generate the data value having a second logic level when the second divider element has a second resistivity. The test circuit generates a first voltage at the controlled node during the normal mode of operation, and generates a second voltage at the controlled node during the test mode of operation. The test circuit may generate the first and second voltages by varying its impedance, or by switching in and out one or more fixed voltages.
A method for testing a programmed level of conductivity of a programmed conduction element, the method comprising:
A method for testing the conductivities of programmed conduction elements, the method comprising:
Dependencies are inferred from the claim text.