REFERENCE VOLTAGE CIRCUITS AND ON-DIE TERMINATION CIRCUITS, METHODS FOR UPDATING THE SAME, AND METHODS FOR TRACKING SUPPLY, TEMPERATURE, AND/OR PROCESS VARIATION
First Claim
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10. A memory device, comprising:
- an on-die termination circuit (ODT) comprising a first path having one or more transistors; and
a reference voltage (Vref) circuit comprising a second path having a plurality of transistors, wherein the path of the ODT circuit and the path of the Vref circuit have substantially the same impedance.
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Abstract
Devices and methods for operating devices are provided, such as those that include a memory device having a reference voltage (Vref) circuit that has substantially similar paths and impedances as an on-die termination (ODT) circuit. One such Vref circuit tracks supply variations and temperature changes in a manner substantially similar to the ODT circuit. In some embodiments an update scheme is provide for the ODT circuit and the Vref circuit to enable simultaneous update of each circuit through the same digital codes.
35 Citations
23 Claims
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10. A memory device, comprising:
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an on-die termination circuit (ODT) comprising a first path having one or more transistors; and a reference voltage (Vref) circuit comprising a second path having a plurality of transistors, wherein the path of the ODT circuit and the path of the Vref circuit have substantially the same impedance.
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11. A device, comprising:
a reference voltage circuit compatible with on-die termination (ODT), comprising a pullup leg, the pullup leg comprising a first transistor and a second transistor, wherein a reference voltage signal is generated from between each of the transistors. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A device, comprising:
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a first distribution path coupled to an on-die termination (ODT) circuit; and a second distribution path coupled to a reference voltage circuit, wherein updates to the ODT circuit and the reference voltage circuit are substantially simultaneously provided to the ODT circuit and the reference voltage circuit. - View Dependent Claims (18, 19)
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20. A method of operating a device, comprising:
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providing a first update to an on-die termination (ODT) circuit on a first distribution path; providing a second update to a reference voltage circuit, wherein the first update and second update are provided to the ODT circuit and the reference voltage circuit, substantially simultaneously. - View Dependent Claims (1, 2, 3, 4, 5, 6, 7, 8, 9, 21, 22, 23)
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22-1. The method of claim 20, wherein the first update comprises a first set of digital codes and the second update comprises a second set of digital codes.
Specification