Apparatus and method for outputting data of semiconductor memory apparatus
AssigneeHynix Semiconductor Inc.
InventorDong-Uk Lee
Life of this patent
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Abstract
An apparatus for outputting data of a semiconductor memory apparatus, which is capable of varying the slew rate and the data output timing, includes a bias generator that generates a bias having a level corresponding to a set value, a slew rate controller that controls a pull-up slew rate or a pull-down slew rate of input data on the basis of the bias generated by the bias generator, and a data outputting unit that outputs data on the basis of the slew rate controlled by the slew rate controller. Therefore, it is possible to satisfy various operational conditions without changing the structure of the circuit and to correspond rapidly and appropriately whit a change in the system, which enables the applied range of the products to be extended.
Claims14
An apparatus for outputting data of a semiconductor memory apparatus, comprising:
- a bias generator including a level switching unit configured to select one of different bias levels corresponding to at least one set value, and configured to generate a bias based on an output of the level switching unit;
- a delay controller configured to delay input data on the basis of the bias generated by the bias generator;
- a slew rate controller configured to control a pull-up or a pull-down slew rate of input data on the basis of the bias generated by the bias generator;
- and
- a data outputting unit configured to output data on the basis of the slew rate controlled by the slew rate controller.
A method of outputting data of a semiconductor memory apparatus including a bias generating unit including a level switching unit, a delay controller, and a slew rate controller, comprising:
- selecting one of different bias levels corresponding to at least one set value using the level switching unit;
- generating a bias using the bias generating unit based on an output of the level switching unit;
- delaying input data by a predetermined time on the basis of a corresponding bias among generated biases using the delay controller;
- controlling a pull-up slew rate or a pull-down slew rate of the delayed data on the basis of a corresponding bias among the generated biases using the slew rate controller;
- and
- outputting data whose slew rate is controlled.
Dependencies are inferred from the claim text.