ICS840021

Integrated Circuit Systems, Inc. ICS840021 FEMTOCLOCKS™ CRYSTAL-TOLVCMOS/LVTTL CLOCK GENERATOR FEATURES 1 LVCMOS/LVTTL output, 7Ω output impedence Crystal oscillator interface designed for 25MHz, 18pF parallel resonant crystal Output frequency: 125MHz VCO range: 560MHz to 680MHz RMS phase jitter @ 125MHz, using a 25MHz crystal (1.875MHz - 20MHz): 0.34ps (typical) RMS phase noise at 125MHz (typical) Phase noise: Offset Noise Power 100Hz ............... -96.9 dBc/Hz 1KHz .............. -122.2 dBc/Hz 10KHz .............. -131.1 dBc/Hz 100KHz .............. -129.5 dBc/Hz 3.3V operating supply 0°C to 70°C ambient operating temperature Industrial temperature information available upon request GENERAL DESCRIPTION The ICS840021 is a Gigabit Ethernet Clock Generator and a member of the HiPerClocksTM HiPerClockS™ family of high performance devices from ICS. The ICS840021 uses a 25MHz crystal to synthesize 125MHz. The ICS840021 has excellent phase jitter performance, over the 1.875MHz – 20MHz integration range. The ICS840021 is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space. ICS www.DataSheet4U.com BLOCK DIAGRAM OE 25MHz XTAL_IN PIN ASSIGNMENT VDDA OE XTAL_OUT XTAL_IN 1 2 3 4 8 7 6 5 VDD Q0 GND nc OSC XTAL_OUT Phase Detector VCO ÷5 Q0 ICS840021 ÷25 (fixed) 8-Lead TSSOP 4.40mm x 3.0mm x 0.925mm package body G Package Top View 840021AG www.icst.com/products/hiperclocks.html 1 REV. A NOVEMBER 30, 2004 Integrat...