The present application claims priority under 35 U.S.C. § 119(a) to Korean patent application number 10-2018-0025366, filed on Mar. 2, 2018, the entire disclosure of which is incorporated herein by reference in its entirety.

The present disclosure generally relates to a data buffer and a memory device having the same.

A memory device may store or output data. Generally, there are two types of memory devices: a volatile memory device in which stored data is extinguished when the power is shut off or interrupted, and a nonvolatile memory device in which stored data is retained even when power is shut off or interrupted. The memory device may include a memory cell array for storing data, a peripheral circuit for performing various operations such as program, read, and erase operations, and a control logic for controlling the peripheral circuit.

A memory controller may control data communication between a host and the memory device.

The memory device may communicate with the memory controller through a channel. For example, a data buffer in the peripheral circuit in the memory device may transmit and receive data between the memory controller and the memory device through the channel.

Embodiments provide a data buffer capable of selectively transmitting data having various swing levels in various modes and a memory device having the data buffer.