ICS84025 Datasheet | Integrated Circuit Systems

PRELIMINARY Integrated Circuit Systems, Inc. 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 d Bc/Hz 1KHz ................. -115 d Bc/Hz 10KHz ................. -125 d Bc/Hz 100KHz ................. -127 d Bc/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 Hi Per Clock S™ a member of the Hi Per Clock S™ 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 .. 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 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 F_SEL0 F_SEL1 MR XTAL1 XTAL2 GND VDDA VDD PLL_SEL GND nc VDDO XTAL1 XTAL2 0 1 Output Divider / Q0:Q5 Feedback Divider 24-Lead, 300-MIL SOIC 7.5mm x 15.33mm x 2.3mm body package M Package Top View F_SEL1 PLL_SEL MR...