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Data output circuit

a data output circuit and output circuit technology, applied in the field of data output circuits, can solve problems such as the reduction of the slew ra

Active Publication Date: 2011-06-02
SK HYNIX INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a data output circuit that performs pre-emphasis or de-emphasis operations without adding a pre-emphasis or de-emphasis driver. The circuit includes a plurality of drivers controlled by impedance codes to output data to an output node. The drivers can be turned on or off during a pre-emphasis period to optimize the data output. The number of drivers controlled by the second group can be turned on during the pre-emphasis period according to pre-emphasis codes. The circuit can include a pull-up driver, a pull-down driver, a pull-up controller, and a pull-down controller to optimize data output. The circuit can be used in various electronic devices to improve data transmission and minimize signal loss.

Problems solved by technology

However, the addition of the driver for the pre-emphasis operation increases the area of the output circuit and the capacitance of the output terminal, causing a slew rate reduction.

Method used

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Embodiment Construction

[0029]Exemplary embodiments of the present invention will be described below in more detail with reference to the accompanying drawings. The present invention may, however, be embodied in different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art. Throughout the disclosure, like reference numerals refer to like parts throughout the various figures and embodiments of the present invention.

[0030]FIG. 3 is a block diagram of a data output circuit in accordance with an embodiment of the present invention.

[0031]Referring to FIG. 3, the data output circuit in accordance with the embodiment of the present invention includes an output unit 310 and a control unit 320. The output unit 310 is configured to output data P_DATA and N_DATA to an output node DQ. The control unit 320 i...

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Abstract

A data output circuit includes a plurality of drivers configured to be turned on / off according to impedance codes to output data to an output node. The impedance codes are divided into a first group having a value to turn on the drivers, and a second group having a value to turn off the drivers, and at least some of the drivers controlled by the second group are turned on during a pre-emphasis period.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority of Korean Patent Application No. 10-2009-0117388, filed on Nov. 30, 2009, which is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]Exemplary embodiments of the present invention relate to a data output circuit for outputting data in various types of semiconductor chips.[0003]FIG. 1 is a block diagram of a conventional data output circuit.[0004]Referring to FIG. 1, the conventional data output circuit includes an output unit 110 and a pre-emphasis unit 120.[0005]The output unit 110 includes an output driver configured to output data through a data pad. The output unit 110 includes a pull-up driver 111 and a pull-down driver 112.[0006]The pull-up driver 111 is turned on when data P_DATA becomes a logic high level, and pulls up a data pad DQ. When the pull-up driver 111 pulls up the data pad DQ, the data pad DQ becomes a logic high level and high data is output. The pu...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H03K17/16H03K19/0175
CPCG11C7/1051H04L25/028H03K19/01707G11C7/1057G11C7/10
Inventor LEE, GEUN-IL
Owner SK HYNIX INC