ICS840004-11 Datasheet | Integrated Circuit Systems

PRELIMINARY Integrated Circuit Systems, Inc. FEMTOCLOCKS™ CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER Features - Four LVCMOS/LVTTL outputs, 15Ω typical output impedance - Crystal oscillator interface - Input frequency range: 22.4MHz to 28MHz - Output frequency Range: 56MHz - 140MHz - VCO Range: 560MHz - 700MHz - RMS phase jitter at 125MHz (1.875MHz - 20MHz): 0.70ps (typical) - RMS phase noise at 125MHz: - Full 3.3V supply - 0°C to 70°C ambient operating temperature - Available in both standard and lead-free Ro HS-pliant packages GENERAL DESCRIPTION The ICS840004-11 is a 4 output LVCMOS/ LVTTL Synthesizer optimized to generate Hi Per Clock S™ Ethernet reference clock frequencies and is a member of the Hi Per Clocks TM family of high performance clock solutions from ICS. Using a 25MHz, 18p F parallel resonant crystal, 125MHz and 62.5MHz can be generated based on one frequency select pin (F_SEL). The ICS840004-11 uses ICS’ 3rd generation low phase noise VCO technology and can achieve 1ps or lower .. typical random rms phase jitter, easily meeting Ethernet jitter requirements. The ICS840004-11 is packaged in a small 20-pin TSSOP package. IC S FREQUENCY SELECT FUNCTION TABLE Inputs M Divider N Divider Value Value 25 10 25 5 ETHERNET FREQUENCIES Output Frequency (25MHz Ref.) 62.5 125 F_SEL 0 1 M/N Ratio Value 2.5 5 BLOCK DIAGRAM OE Pullup F_SEL Pullup PIN ASSIGNMENT F_SEL nc nc nc OE nc nc VDDA nc VDD 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 nc GND Q0 Q1 VDDO Q2 Q3 GND XTAL_IN...