On-die termination device to compensate for a change in an external voltage
AssigneeHynix Semiconductor Inc.
InventorJung Hoon Park
Life of this patent
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Abstract
An on-die termination (ODT) control in a semiconductor memory device compensates for a change in an external voltage. The on-die termination device includes a voltage comparator that compares an external voltage to a set internal reference voltage. The compared values are sent to a controller that controls an on-die termination impedance value according to the output signal from the voltage comparator. Based on the output of the controller, the present invention spontaneously controls an on-die termination resistance value according to the change in the external voltage without degrading device characteristics during high-speed operation.
Claims18
An on-die termination device, comprising:
- a voltage comparator comparing an external voltage and a set internal reference voltage to provide an output signal;
- and
- a controller controlling an on-die termination impedance value according to the output signal from the voltage comparator.
An on-die termination device, comprising:
- a voltage comparator comparing an external voltage and a reference voltage to provide an output signal;
- an on-die termination impedance generated by an impedance unit having a plurality of MOS transistors and a plurality of passive resistor elements;
- and
- a controller controlling the on-die termination impedance according to the output signal from the voltage comparator.
Dependencies are inferred from the claim text.