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US 6,720,802 B2Granted
Data output buffer
AssigneeHynix Semiconductor Inc.
InventorHo Youb Cho
Life of this patent
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Abstract
A data output buffer is disclosed that is capable of reducing the power consumption of a circuit utilizing low power consumption in such a way that a data output buffer driver of the data output buffer is turned off to place a data output signal at a HIGH impedance state during a deep power mode wherein all internal supply voltages used are in an OFF state. Therefore, the data output buffer can prevent a data contention in a data bus and shut off a current path to prevent unnecessary power consumption.
Claims2
A data output buffer comprising:
- a driver driving control unit configured to control an output of a data output driver depending on a state of an output enable signal;
- and
- the data output driver configured to transmit a read data applied from a data bus line the driver driving control unit,
- wherein the driver driving control unit includes:
- a level shifter for receiving the output enabled signal and generating a level shifter's output signal;
- and
- an output control unit comprising a logic unit for performing a logic function on the output signal of the level shifter and a deep power down signal that is enabled in a deep power down mode, the output control unit controlling the output signal of the data output driver to be placed in a HIGH impedance state in the deep power down mode.
4 more elements
Dependencies are inferred from the claim text.