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US 12,190,989 B2Granted
Data output buffer and semiconductor apparatus including the same
AssigneeSK hynix Inc.
InventorsKyu Dong Hwang, Bo Ram Kim, Dae Han Kwon
Life of this patent
Estimating the term…
Abstract
A data output buffer includes a first driver configured to drive a data input/output (I/O) pad according to an input signal and allow data drivability to be controlled according to an impedance calibration code and a second driver configured to perform a de-emphasis operation on the data I/O pad and allow de-emphasis drivability to be controlled according to the impedance calibration code.
Claims12
A data output buffer comprising:
- a first driver configured to directly receive an impedance calibration code, drive a data input/output (I/O) pad according to an input signal and allow data drivability to be controlled according to the impedance calibration code;
- a second driver configured to directly receive emphasis signals, perform a de-emphasis operation on the data I/O pad and allow de-emphasis drivability to be controlled according to a selection code and the emphasis signals;
- and
- a selection circuit configured to output one of a fixing code and the impedance calibration code as the selection code according to a selection signal,
- wherein the first driver and the second driver are coupled to the data I/O pad directly.
2 more elements
A semiconductor apparatus comprising:
- a memory region configured to output read data through a data input/output (I/O) pad according to a read command and configured to store write data that is input through the data I/O pad according to a write command;
- an impedance calibration circuit configured to adjust a value of an impedance calibration code based on an impedance of an external resistor;
- a first driver configured to directly receive the impedance calibration code. drive the data input/output (I/O) pad according to an input signal and allow data drivability to be controlled according to the impedance calibration code;
- a second driver configured to directly receive emphasis signals, perform a de-emphasis operation on the data I/O pad and allow de-emphasis drivability to be controlled according to a selection code and the emphasis signals;
- and
- a selection circuit configured to output one of a fixing code and the impedance calibration code as the selection code according to a selection signal,
- wherein the first driver and the second driver are coupled to the data I/O pad directly.
4 more elements
Dependencies are inferred from the claim text.