ICS844022I-02

www.DataSheet4U.com PRELIMINARY Integrated Circuit Systems, Inc. ICS844022I-02 FEMTOCLOCKS™ CRYSTAL-TO- LVDS CLOCK GENERATOR FEATURES (1) Differential LVDS output Crystal oscillator interface, 18pF parallel resonant crystal (24.5MHz - 34MHz) Output frequency range: 61.25MHz - 170MHz VCO range: 490MHz - 680MHz RMS phase jitter @ 125MHz, using a 25MHz crystal (1.875MHz - 20MHz): 0.44ps (typical) 3.3V or 2.5V operating supply -40°C to 85°C ambient operating temperature GENERAL DESCRIPTION The ICS844022I-02 is an Ethernet Clock Generator and a member of the HiPerClocksTM HiPerClockS™ family of high performance devices from ICS. The ICS844022I-02 uses an 18pF parallel resonant crystal over the range of 24.5MHz - 34MHz. For Ethernet applications, a 25MHz crystal is used and either 62.5MHz or 125MHz may be selected with the FREQ_SEL pin. The ICS844022I-02 has excellent <1ps phase jitter performance, over the 1.875MHz - 20MHz integration range. The ICS844022I-02 is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space. ICS COMMON CONFIGURATION TABLE - Gb ETHERNET Inputs Crystal Frequency (MHz) 25 25 26.66 26.66 33.33 33.33 FREQ_SEL 0 1 0 1 0 1 M 20 20 20 20 20 20 N 4 8 4 8 4 8 Multiplication Value M/N 5 2.5 5 2. 5 5 2.5 Output Frequency (MHz) 12 5 62.5 133.33 66.66 166.66 83.33 BLOCK DIAGRAM FREQ_SEL Pullup PIN ASSIGNMENT FREQ_SEL N 0 ÷4 1 ÷8 VDDA GND XTAL_OUT XTAL_IN 1 2 3 4 8 7 6 5 VDD Q nQ FREQ_SEL XTAL_IN OSC XTAL_OU...