ICS8432-51

700MHZ, CYRSTAL-TO-3.3V DIFFERENTIAL LVPECL FREQUENCY SYNTHESIZER ICS8432-51 GENERAL DESCRIPTION The ICS8432-51 is a general purpose, dual output Crystal-to3.3V Differential LVPECL High Frequency Synthesizer. The ICS8432-51 has a selectable REF_CLK or crystal input. The VCO operates at a frequency range of 250MHz to 700MHz. The VCO frequency is programmed in steps equal to the value of the input reference or crystal frequency. The VCO and output frequency can be programmed using the serial or parallel interface to the configuration logic. The low phase noise characteristics of the ICS8432-51 make it an ideal clock source for Gigabit Ethernet, Fibre Channel 1 and 2, and Infiniband applications. FEATURES Dual differential 3.3V LVPECL outputs Selectable crystal oscillator interface or LVCMOS/LVTTL REF_CLK Output frequency range: 31.25MHz to 700MHz Crystal input frequency range: 12MHz to 25MHz VCO range: 250MHz to 700MHz Parallel or serial interface for programming counter and output dividers RMS period jitter: 3.5ps (maximum) Cycle-to-cycle jitter: 25ps (maximum) 3.3V supply voltage 0°C to 70°C ambient operating temperature Available in both standard (RoHS 5) and lead-free (RoHS 6) packages Replaces the ICS8432-01 BLOCK DIAGRAM PIN ASSIGNMENT XTAL_IN nP_LOAD VCO_SEL M0 M1 M2 M3 M4 VCO_SEL XTAL_SEL REF_CLK XTAL1 XTAL2 OSC 0 1 MR S_LOAD S_DATA S_CLOCK nP_LOAD M0:M8 N0:N1 PLL PHASE DETECTOR VCO 0 ÷1 ÷2 ÷M ÷4 1 ÷8 CONFIGURATION INTERFACE ...