In the entire specification, when an element is referred to as being “connected” or “coupled” to another element, it can be directly connected or coupled to the another element or be indirectly connected or coupled to the another element with one or more intervening elements interposed therebetween. In addition, when an element is referred to as “including” a component, this indicates that the element may further include one or more other components rather than excluding such other component(s), unless the context indicates otherwise.

FIG. 1 is a diagram illustrating a data buffer 1000 according to an embodiment of the present disclosure.

Referring to FIG. 1, the data buffer 1000 may include a data transmission circuit 1100 and a mode switching circuit 1200.

The data transmission circuit 1100 may be supplied with a first voltage Vp1 supplied at a first voltage terminal and a second voltage Vp2 supplied at a second voltage terminal, and be coupled to a ground voltage terminal at which a ground voltage VSS is supplied. The data transmission circuit 1100 may receive an input data DATA_IN and output output data DATA_OUT in response to a first enable signal EN_1 or a second enable signal EN_2.