ICS843252-04 ICST | Alldatasheet

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www.icst.com/products/hiperclocks.html REV. A JANUARY 25, 2006 Integrated Circuit Systems, Inc. ICS843252-04 FEMTOCLOCKS™ CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR PRELIMINARY GENERAL DESCRIPTION The ICS843252-04 is a 10Gb/12Gb Ethernet Clock Generator and a member of the HiPerClocksTM family of high performance devices from ICS. The ICS843252-04 can synthesize 10 Gigabit Ethernet and 12 Gigabit Ethernet with a 25MHz crystal. It can also generate SATA and 10Gb Fibre Channel reference clock frequencies with the appropriate choice of crystals. The ICS843252-04 has excellent phase jitter performance and is packaged in a small 16-pin TSSOP, making it ideal for use in systems with limited board space.

FEATURES

  • Two differential 3.3V LVPECL output
  • Crystal oscillator interface designed for 18pF parallel resonant crystals
  • Crystal input frequency range: 19.33MHz - 30MHz
  • Output frequency range: 145MHz - 187.5MHz
  • VCO frequency range: 580MHz - 750MHz
  • RMS phase jitter at 156.25MHz (1.875MHz - 20MHz): 0.39ps (typical)
  • 3.3V operating supply
  • 0°C to 70°C ambient operating temperature
  • Industrial temperature information available upon request
  • Available in both standard and lead-free compliant packages HiPerClockS™ ICS Pulldown Pulldown Pulldown Pullup Pulldown Phase Detector VCO 580MHz-750MHz OSC 0 = ÷25 (default) 1 = ÷30 DIV. N D LE Q XTAL_IN XTAL_OUT nQ0 nQ1 FREQ_SEL BLOCK DIAGRAM PIN ASSIGNMENT CONFIGURATION TABLE WITH 25MHZ CRYSTAL s t u p n I y c n e u q e r F t u p t u O z H M n o it a c il p p A y c n e u q e r F l a t s y r C z H M k c a b d e e F e d i v i D y c n e u q e r F O C V z H M e d i v i D t u p t u O N t e n r e h t E tib a gi G t e n r e h t E tib a gi G CONFIGURATION TABLE WITH SELECTABLE CRYSTALS s t u p n I y c n e u q e r F t u p t u O z H M n o it a c il p p A y c n e u q e r F l a t s y r C z H M k c a b d e e F e d i v i D y c n e u q e r F O C V z H M e d i v i D t u p t u O N A T A S le n n a h C e r bi F tib a gi G A T A S le n n a h C e r bi F tib a gi G t e n r e h t E tib a gi G CLK_SEL REF_CLK nPLL_SEL OE nQ1 VCCO OE nPLL_SEL VCCO nQ0 XTAL_IN XTAL_OUT VEE REF_CLK CLK_SEL VCC VCCA FREQ_SEL ICS843252-04 16-Lead TSSOP 4.4mm x 5.0mm x 0.92mm package body G Package Top View The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice.

TABLE 2. PIN CHARACTERISTICS TABLE 1. PIN DESCRIPTIONS

www.icst.com/products/hiperclocks.html REV. A JANUARY 25, 2006 Integrated Circuit Systems, Inc. ICS843252-04 FEMTOCLOCKS™ CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR PRELIMINARY TABLE 3A. POWER SUPPLY DC CHARACTERISTICS, VCC = VCCA = VCCO = 3.3V±5%, TA = 0°C TO 70°C TABLE 3C. LVPECL DC CHARACTERISTICS, VCC = VCCA = VCCO = 3.3V±5%, TA = 0°C TO 70°C ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC 4.6V Inputs, VI -0.5V to VCC + 0.5V Outputs, IO Continuous Current 50mA Surge Current 100mA Package Thermal Impedance, θJA 89°C/W (0 lfpm) Storage Temperature, TSTG -65°C to 150°C NOTE: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only. Functional operation of product at these conditions or any conditions be- yond those listed in the DC Characteristics or AC Character- istics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability. TABLE 3B. LVCMOS/LVTTL DC CHARACTERISTICS, VCC = VCCA = VCCO = 3.3V±5%, TA = 0°C TO 70°C l o b m y S r e t e m a r a P s n o iti d n o C t s e T m u m i n i M l a c i p y T m u m i x a M s ti n U V H I e g a tlo V h gi H t u p n I V C C V V L I e g a tlo V w o L t u p n I V I H I t n e rr u C h gi H t u p n I K L C F E R L E S K L C L E S Q E R F L E S L L P n V C C V N I V A µ E O V C C V N I V A µ I L I t n e rr u C w o L t u p n I K L C F E R L E S K L C L E S Q E R F L E S L L P n V C C V V N I V A µ E O V C C V V N I V A µ l o b m y S r e t e m a r a P s n o iti d n o C t s e T m u m i n i M l a c i p y T m u m i x a M s ti n U V H O E T O N e g a tlo V h gi H t u p t u O V O C C V O C C V V L O E T O N e g a tlo V w o L t u p t u O V O C C V O C C V V G N I W S g ni w S e g a tlo V t u p t u O k a e P o k a e P V h ti w d e t a ni m r e t st u p t u O E T O N Ω V o t O C C V l o b m y S r e t e m a r a P s n o iti d n o C t s e T m u m i n i M l a c i p y T m u m i x a M s ti n U V C C e g a tlo V ylp p u S e r o C V V A C C e g a tlo V ylp p u S g ola n A V I C C t n e rr u C ylp p u S r e w o P A m I A C C t n e rr u C ylp p u S g ola n A A m I E E t n e rr u C ylp p u S r e w o P A m

TABLE 5. AC CHARACTERISTICS, VCC = VCCA = VCCO = 3.3V±5%, TA = 0°C TO 70°C TABLE 4. CRYSTAL CHARACTERISTICS

www.icst.com/products/hiperclocks.html REV. A JANUARY 25, 2006 Integrated Circuit Systems, Inc. ICS843252-04 FEMTOCLOCKS™ CRYSTAL-TO- 3.3V LVPECL CLOCK GENERATOR PRELIMINARY PARAMETER MEASUREMENT INFORMATION OUTPUT SKEW OUTPUT RISE/FALL TIME 3.3V OUTPUT LOAD AC TEST CIRCUIT SCOPE Qx nQx LVPECL -1.3V ± 0.165V Clock Outputs 20% 80% 80% 20% tR tF VSWING tPW tPERIOD tPW tPERIOD odc = x 100% Q0, Q1 nQ0, nQ1 VEE VCC, VCCA, VCCO RMS PHASE JITTER Phase Noise Mask Offset Frequency Phase Noise Plot RMS Jitter = Area Under the Masked Phase Noise Plot Noise Power tsk(o) nQy Qy nQx Qx OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD

This section provides information on power dissipation and junction temperature for the ICS843051. Equations and example calculations are also provided. The total power dissipation for the ICS843051 is the sum of the core power plus the power dissipated in the load(s). The following is the power dissipation for VCC = 3.3V + 5% = 3.465V, which gives worst case results. NOTE: Please refer to Section 3 for details on calculating power dissipated in the load. device. The maximum recommended junction temperature for HiPerClockSTM devices is 125°C. moderate air flow of 1 meter per second and a multi-layer board, the appropriate value is 81.8°C/W per Table 6 below. and the type of board (single layer or multi-layer). TABLE 6. THERMAL RESISTANCE θθθθθJA FOR 16 LEAD TSSOP, FORCED CONVECTION NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.

  1. 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 3. Pd_H is power dissipation when the output drives high. Pd_L is the power dissipation when the output drives low. FIGURE 3. LVPECL DRIVER CIRCUIT AND TERMINATION

TABLE 6. θJAVS. AIR FLOW TABLE FOR 16 LEAD TSSOP NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.

TABLE 7. PACKAGE DIMENSIONS

TABLE 8. ORDERING INFORMATION product for use in life support devices or critical medical instruments. The aforementioned trademarks, HiPerClockS and FemtoClocks are trademarks of Integrated Circuit Systems, Inc. or its subsidiaries in the United States and/or other countries.