Fratello no it does not.....but i have news i almost destroy my crystal and with a small weight on it...it working!!!!!
not so good is true..but my lcd is changing numbers at last!!!
i think that my crystal is the problem.... i think a cylictrical xtal is nessesary to work ds1307...in youtube videos
every crystal i saw is a small cylidrical....
now how seconds are change and the led is not flashing...i dont know!!!!!!
thank 4 the reply