ICS84025

PRELIMINARY Integrated Circuit Systems, Inc. ICS84025 CRYSTAL-TO-LVCMOS / LVTTL FREQUENCY SYNTHESIZER WITH FANOUT BUFFER FEATURES 6 LVCMOS/LVTTL outputs Crystal oscillator interface Output frequency range: 53.125MHz to 125MHz Crystal input frequency: 25MHz and 25.5MHz RMS phase jitter at 106.25, using a 25.5MHz crystal (637KHz to 10MHz): 3.25ps Phase noise: Offset Noise Power 100Hz ................. -100 dBc/Hz 1KHz ................. -115 dBc/Hz 10KHz ................. -125 dBc/Hz 100KHz ................. -127 dBc/Hz 3.3V core, outputs may either be 3.3V, 2.5V or 1.8V 0°C to 70°C ambient operating temperature Industrial temperature information available upon request GENERAL DESCRIPTION The ICS84025 is a Crystal-to-LVCMOS/LVTTL Frequency Synthesizer with Fanout Buffer and HiPerClockS™ a member of the HiPerClockS™ family of High Performance Clock Solutions from ICS. The VCO frequency is programmed in steps equal to the value of the crystal frequency. The VCO and output frequency can be programmed using the feedback and output frequency select pins. The low phase noise characteristics of the ICS84025 make it an ideal clock source for Fibre www.DataSheet4U.com Channel 1 and Gigabit Ethernet applications. ,&6 FUNCTION TABLE Inputs MR 1 0 0 0 0 F_SEL1 X 0 0 1 1 F_SEL0 X 0 1 0 1 25.5MHz 25.5MHz 25MHz 25MHz XTAL Output Frequency F_OUT LOW 53.125MHz 106.25MHz 62.5MHz 125MHz BLOCK DIAGRAM PIN ASSIGNMENT VDDO Q0 GND Q1 VDDO Q2 GND Q3 VDDO Q4 GND Q5 1 2 3 4 5 6 7 ...