%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 8-6-4 on page 579.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

\documentclass{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{427.6677pt}

\StartShownPreambleCommands
\usepackage[ic]{circ}
\usepackage{array}
\StopShownPreambleCommands
\begin{document}
\providecommand{\Lcs}[1]{\mbox{\normalfont\ttfamily\char'134#1}}
\setlength{\extrarowheight}{3mm}
\def\Ccirc#1 #2 #3{\def\Clpin##1{\relax}\def\Crpin##1{\relax}%
   \raisebox{\depth}%
   {\begin{circuit}0 \csname #1\endcsname n {\,} #2 {} #3
   \end{circuit}}}
\begin{tabular}{@{}cccccc@{}}
\Ccirc NRSFF S {\Clpin{S}\Clpin{R}\Crpin{Q}\Crpin{NQ}}
&
\Ccirc DFF C {\Clpin{C}\Clpin{D}\Crpin{Q}\Crpin{NQ}}
&
\Ccirc JKMSFF R {\Clpin{S}\Clpin{J}\Clpin{C}\Clpin{K}\Clpin{R}\Crpin{Q}\Crpin{NQ}}
&
\Ccirc fff R {\Clpin{IS}\Clpin{IT}\Clpin{R}\Crpin{OK}\Crpin{O}\Crpin{OD}}
&\Ccirc NULL i+ {\Clpin{i+}\Clpin{i-}\Crpin{o+}\Crpin{o-}}
\\
\Lcs{NRSFF} & \Lcs{DFF} & \Lcs{JKMSFF} & \Lcs{fff} & \Lcs{NULL} \\
RS flip-flop & D flip-flop & JK master slave flip-flop & timer & nuller
\end{tabular}
\end{document}