Vabbè... ecco i link XD
http://digilander.libero.it/panetti/digitale/ttl.htm
http://www.itis-einstein.roma.it/TIC/Stuweb4/appunti/Famiglie%20logiche%20TTL.htm
http://www.ing.unisannio.it/elettronica/didattica/informatica_vo/esd/08_TTL.pdf
http://www.google.it/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&ved=0CEcQFjAF&url=http%3A%2F%2Farduino.cc%2Fforum%2Findex.php%3Ftopic%3D103478.0&ei=-vCfT476MI714QSr2YnFAw&usg=AFQjCNEPkHN0ejsUtsl_XdwFPAxRT48IRQ&sig2=tfIXQ2VFnSrS8feMI3vQXg
ih ih ih... ]