The 843S1066D is a high frequency clock generator. The 843S1066D uses an external 20MHz crystal to synthesize either 1066.67MHz or 1600MHz. The 843S1066D has excellent cycle-to-cycle and RMS period jitter performance. The 843S1066D operates at 3.3V operating supply and is available in a fully RoHS compliant 8-lead TSSOP package..