The PI6C3421A is a Spread Spectrum Clock Synthesizer and part of the Pericom SSCG product family. The part generates one high precision 27.000 MHz spread spectrum clock output from a single clock source or a crystal and one 27.000 MHz un-modulated clock output, and is designed to reduce electromagnetic interference (EMI) by spreading the clock. This reduction in EMI can result in significant system cost saving and less design complexity by reducing the number of circuit board layers ferrite beads and shielding. In the absence of a spread spectrum clock, other EMI-reducing components are required in order to comply with regulatory agency requirements.