PDF ICS843301I-108 Data sheet ( Hoja de datos )

Número de pieza	ICS843301I-108
Descripción	2.5V LVPECL 75MHZ FREQUENCY SYNTHESIZER W/SSC
Fabricantes	Integrated Device Technology
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No Preview Available ! PRELIMINARY FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL 75MHZ FREQUENCY SYNTHESIZER W/SSC ICS843301I-108 GENERAL DESCRIPTION The ICS843301I-108 is a 75MHz Frequency ICS Generator and a member of the HiPerClocksTM HiPerClockS™ family of high perfor mance devices from IDT. The ICS843301I-108 uses a 20MHz crystal to synthesize 75MHz output. The device supports 0.5% downspread spread spectrum clocking. The ICS843301I- 108 has excellent <1ps phase jitter performance, over an integration range of 900kHz - 7.5MHz. The device is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space. FEATURES • One differential 3.3V or 2.5V LVPECL output • Crystal oscillator interface designed for 20MHz, 18pF parallel resonant crystal • Output frequency: 75MHz • Supports SSC, 0.5% downspread • RMS phase jitter @ 75MHz, using a 20MHz crystal (900kHz - 7.5MHz): 0.73ps (typical) • Full 3.3V or 2.5V operating supply • -40°C to 85°C ambient operating temperature • Available in both standard (RoHS 5) and lead-free (RoHS 6) packages SSC FUNCTION TABLE www.DataShInepetu4tU.com SSC 0 (default) 1 Mode SSC Off 0.5% Downspread BLOCK DIAGRAM PIN ASSIGNMENT XTAL_IN XTAL_OUT 20MHz OSC SSC Pulldown Phase Detector VCO 600MHz PLL N Div ÷8 M Div ÷30 VCCA 1 8 VCC VEE 2 7Q XTAL_OUT 3 6 nQ Q XTAL_IN 4 5 SSC nQ ICS843301I-108 8-Lead TSSOP 4.40mm x 3.0mm x 0.925mm package body G Package Top View The Preliminary Information presented herein represents a product in pre-production. The noted characteristics are based on initial product characterization and/or qualification. Integrated Device Technology, Incorporated (IDT) reserves the right to change any circuitry or specifications without notice. IDT™ / ICS™ 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC 1 ICS843301BGI-108 REV. A OCTOBER 9, 2007 1 page ICS843301I-108 FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC PARAMETER MEASUREMENT INFORMATION PRELIMINARY 2V 2V VCC VCCA LVPECL VEE -1.3V ± 0.165V SCOPE Qx nQx 3.3V OUTPUT LOAD AC TEST CIRCUIT 2V 2V VCC VCCA LVPECL VEE -0.5V ± 0.125V SCOPE Qx nQx 2.5V OUTPUT LOAD AC TEST CIRCUIT VOH VREF 1σ contains 68.26% of all measurements 2σ contains 95.4% of all measurements 3σ contains 99.73% of all measurements 4σ contains 99.99366% of all measurements 6σ contains (100-1.973x10-7)% of all measurements Reference Point (Trigger Edge) www.DataSheet4U.com Histogram Mean Period (First edge after trigger) VOL Clock 20% Outputs 80% tR PERIOD JITTER OUTPUT RISE/FALL TIME 80% tF VSW I N G 20% nQ Q t PW t PERIOD odc = t PW x 100% t PERIOD OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD IDT™ / ICS™ 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC 5 ICS843301BGI-108 REV. A OCTOBER 9, 2007 5 Page ICS843301I-108 FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC 3. Calculations and Equations. The purpose of this section is to derive the power dissipated into the load. LVPECL output driver circuit and termination are shown in Figure 7. VCC PRELIMINARY Q1 VOUT RL 50Ω VCC - 2V FIGURE 7. LVPECL DRIVER CIRCUIT AND TERMINATION To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a termination voltage of V - 2V. CC • For logic high, V = V = V – 0.9V OUT OH_MAX CCO_MAX (V - V ) = 0.9V CC_MAX OH_MAX www.DataSheet4U.com • For logic low, V = V = V – 1.7V OUT OL_MAX CC_MAX (V - V ) = 1.7V CC_MAX OL_MAX Pd_H is power dissipation when the output drives high. Pd_L is the power dissipation when the output drives low. Pd_H = [(V – (V - 2V))/R ] * (V - V ) = [(2V - (V - V ))/R ] * (V - V ) = OH_MAX CC_MAX L CC_MAX OH_MAX CC_MAX OH_MAX L CC_MAX OH_MAX [(2V - 0.9V)/50Ω] * 0.9V = 19.8mW Pd_L = [(V – (V - 2V))/R ] * (V - V ) = [(2V - (V - V ))/R ] * (V - V ) = OL_MAX CC_MAX L CC_MAX OL_MAX CC_MAX OL_MAX L CC_MAX OL_MAX [(2V - 1.7V)/50Ω] * 1.7V = 10.2mW Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW IDT™ / ICS™ 3.3V, 2.5V LVPECL FREQUENCY SYNTHESIZER W/SSC 11 ICS843301BGI-108 REV. A OCTOBER 9, 2007 11 Page

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