ICS840004-01

PRELIMINARY Integrated Circuit Systems, Inc. ICS840004-01 FEMTOCLOCKS™ CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER FEATURES Four LVCMOS/LVTTL outputs, 15Ω typical output impedance Selectable crystal oscillator interface or LVCMOS/LVTTL single-ended input Output frequency Range: 56MHz - 175MHz VCO Range: 560MHz - 700MHz RMS phase jitter at 156.25MHz (1.875MHz - 20MHz): 0.52ps (typical) design target Phase noise: Offset Noise Power GENERAL DESCRIPTION The ICS840004-01 is a 4 output LVCMOS/LVTTL Synthesizer optimized to generate Ethernet HiPerClockS™ reference clock frequencies and is a member of the HiPerClocksTM family of high performance clock solutions from ICS. Using a 25MHz, 18pF parallel resonant crystal, the following frequencies can be generated based on the 2 frequency select pins (F_SEL1:0): 156.25MHz, 125MHz, and 62.5MHz. The ICS840004-01 uses ICS’ 3rd generation low phase noise VCO technology and can www.DataSheet4U.com achieve 1ps or lower typical random rms phase jitter, easily meeting Ethernet jitter requirements. The ICS840004-01 is packaged in a small 20-pin TSSOP package. IC S 100Hz ............... -94.9 dBc/Hz 1kHz ............. -119.6 dBc/Hz 10kHz ............. -128.9 dBc/Hz 100kHz ............. -129.2 dBc/Hz Full 3.3V or 3.3V core/2.5V output supply mode 0°C to 70°C ambient operating temperature Available in both standard and lead-free RoHS-compliant packages FREQUENCY SELECT FUNCTION TABLE F_SEL1 F_SEL0 0 0 1 1 0 1 0 1 FOR ETHERNET...