ICS843021

Integrated Circuit Systems, Inc. www.DataSheet4U.com ICS843021 FEMTOCLOCKS™ CRYSTAL-TO3.3V LVPECL CLOCK GENERATOR FEATURES 1 differential 3.3V LVPECL output Crystal oscillator interface designed for 22.4MHz - 28MHz, 18pF parallel resonant crystal Output frequency range: 112MHz - 140MHz VCO range: 560MHz to 700MHz Output duty cycle range: 49% - 51% RMS phase jitter @ 125MHz, using a 25MHz crystal (1.875MHz - 20MHz): 0.37ps (typical) RMS phase noise at 125MHz (typical) Offset Noise Power 100Hz ............... -94.2 dBc/Hz 1KHz .............. -122.8 dBc/Hz 10KHz .............. -132.2 dBc/Hz 100KHz .............. -131.3 dBc/Hz 3.3V operating supply 0°C to 70°C ambient operating temperature Industrial temperature information available upon request Lead-Free package fully RoHS compliant GENERAL DESCRIPTION The ICS843021 is a Gigabit Ethernet Clock Generator and a member of the HiPerClocksTM HiPerClockS™ family of high performance devices from ICS. The ICS843021 uses a 25MHz crystal to synthesize 125MHz. The ICS843021 has excellent phase jitter performance, over the 1.875MHz – 20MHz integration range. The ICS843021 is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space. ICS FREQUENCY TABLE - TYPICAL APPLICATIONS Inputs Crystal Frequency (MHz) 25 26.6 Output Frequency (MHz) 12 5 133 BLOCK DIAGRAM 25MHz XTAL_IN PIN ASSIGNMENT VCCA VEE XTAL_OUT XTAL_IN 1 2 3 4 8 7 6 5 VCC Q0 nQ0 nc OSC XTAL_OUT Phase Detector VCO...