Nie, je to tak ako napisal MaPa, http://www.icst.com/products/pdf/ics9148-26.pdf Pozri 8 riadok.
"Spread Spectrum built in at ±0.5% or ±1.5% modulation to reduce the
EMI" EMI-Elektro magnetics interference alebo elektromagneticke rusenie. Je to preto aby to zaoblilo hrany clock generatoru o x% a tym znizilo rusenie.