\documentclass[border=1mm]{standalone}
\usepackage{tikz-timing}
\tikzset{timing/name/.style={font=\sffamily\scriptsize}}
\begin{document}
\begin{tikztimingtable}[timing/slope=0,timing/xunit=15,timing/yunit=15]
A & 2{8C}; \\
B & 4{4C}; \\
C & 8{2C}; \\
D & 16{C}; \\
Y & HXLHXHXHXLHHHXXH \\
\extracode
\begin{scope}[on background layer]
\vertlines[help lines, dashed]{}
\horlines[help lines]{}
\foreach [count=\x] \b in {0,1,...,15} {
\node [below,font=\sffamily\bfseries\tiny,inner ysep=2pt] at (\x-.5,-8) {\b};}
\end{scope}
\end{tikztimingtable}
\end{document}