Output driver for use in semiconductor device

US20100164544A1Inactive Publication Date: 2010-07-01SK HYNIX INC
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
SK HYNIX INC
Publication Date
2010-07-01
Estimated Expiration
Not applicable · inactive patent

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Abstract

An output driver for use in a semiconductor device includes a first pre-drive unit, a second pre-drive unit, and a main drive unit. The first pre-drive unit generates a pull-up drive control signal based on a data signal. The pull-up drive control signal swings between a power supply voltage level and a low voltage level. The data signal swings between the power supply voltage level and a ground voltage level. The second pre-drive unit generates a pull-down drive control signal based on the data signal. The pull-down drive control signal swings between a high voltage level and the ground voltage level. The main drive unit performs pull-up / down drive operations to an output terminal in response to the pull-up / down drive control signals, respectively. Herein, the high voltage level is higher than the power supply voltage level and the low voltage level is lower than the ground voltage level.
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Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] The present invention claims priority of Korean patent application number 10-2008-0134919, filed on Dec. 26, 2008, the disclosure of which is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION

[0002] The present invention relates to an output driver for use in a semiconductor device, and more particularly, to an output driver effectively performing an impedance matching operation.

[0003] An output driver is a circuit for driving an output pad to which a predetermined load is connected in order to output a data from a semiconductor device. Generally, a push-pull type driver is widely used as the output driver. The push-pull type driver has a form of a CMOS inverter constituted with a pull-up PMOS transistor and a pull-down NMOS transistor serially connected each other between a power supply voltage VDD terminal and a ground voltage VSS terminal.

[0004] FIG. 1 is a detailed circuit diagram illustrating a conventional outp...

Claims

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