the u201d are intended to include the plural forms as well unless the context clearly indicates otherwise it will be further understood that the terms u201c comprises u201d u201c comprising u201d u201c includes u201d and or u201c including u201d when used herein specify the presence of stated features integers steps operations elements and or components but do not preclude the presence or addition of one or more other features integers steps operations elements components and or groups thereof unless otherwise defined all terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs it will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein fig3 is a circuit diagram illustrating an example of a serializer according to an embodiment the serializer includes a pull up unit pu 0 and data select units ds 1 ds 2 ds 3 and ds 4 the pull up unit pu 0 includes pmos transistor mp 0 coupled between a first supply voltage vdd and an output node n 0 a voltage of the output node n 0 can be pulled up to the first supply voltage vdd by the pmos transistor mp 0 with a first current driving capability the data select units ds 1 ds.