Цитата(sergey sva @ Jun 6 2009, 18:49)

просмотрел datasheet но не чего об этом не нашел.
Цитата из DS:
Цитата
In all cases, if an external clock is used, the duration of each of its levels must be longer than the
master clock period. The external clock frequency must be at least 2.5 times lower than the master
clock