ICS843081I-01 Integrated Circuit Systems, Inc. FEMTOCLOCKS™ CRYSTAL-TO3.3V, 2.5V LVPECL CLOCK MULTIPLIER GENERAL DESCRIPTION FEATURES The ICS843081I-01 is an Ethernet Clock Multiplier and a member of the HiPerClocksTM HiPerClockS™ family of high performance devices from ICS. The ICS843081I-01 accepts a crystal reference of 19.6MHz - 28MHz. The ICS843081I-01 has excellent 1ps or lower phase jitter performance, over the 1.875MHz - 20MHz integration range. The ICS843081I-01 is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space. • One differential LVPECL output ICS • One crystal oscillator interface: 19.6MHz - 28MHz • Output frequency range: 490MHz - 700MHz • VCO range: 490MHz - 700MHz • RMS phase jitter @ 625MHz using a 25MHz reference (1.875MHz - 20MHz): 0.32ps (typical) • 3.3V or 2.5V operating supply • -40°C to 85°C ambient operating temperature • Available in both standard and lead-free RoHS compliant packages FREQUENCY EXAMPLE FUNCTION TABLE Input M/N (Multiplier) Output Frequencies (MHz) 20 25 500 25 25 62 5 28 25 700 XTAL (MHz) BLOCK DIAGRAM PIN ASSIGNMENT OE VCCA XTAL_OUT XTAL_IN VEE XTAL_IN Q Phase Detector VCO 490 - 700 MHz XTAL_OUT nQ 1 2 3 4 8 7 6 5 VCC Q nQ OE ICS843081I-01 8-Lead TSSOP 4.40mm x 3.0mm x 0.925mm package body G Package Top View M = ÷25 (fixed) 843081AGI-01 www.icst.com/products/hiperclocks.html 1 REV. B JANUARY 23, 2006 ICS843081I-01 Integrated Circuit Systems, Inc. FEMTOCLOCKS™ CRYSTAL-TO3.3V, 2.5V LVPECL CLOCK MULTIPLIER TABLE 1. PIN DESCRIPTIONS Number Name Type Description 1 2, 3 4 VCCA XTAL_OUT, XTAL_IN VEE Power 5 OE Input 6, 7 nQ, Q Output Analog supply pin. Crystal oscillator interface. XTAL_IN is the input, XTAL_OUT is the output. Negative supply pin. Output enable pin. When HIGH, Q output is enabled. When LOW, forces Q to HiZ state. LVCMOS/LVTTL interface levels. Differential clock outputs. LVPECL interface levels. 8 VCC Power Core supply pin. Input Power Pullup NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values. TABLE 2. PIN CHARACTERISTICS Symbol Parameter CIN Input Capacitance 4 pF RPULLUP Input Pullup Resistor 51 kΩ 843081AGI-01 Test Conditions Minimum www.icst.com/products/hiperclocks.html 2 Typical Maximum Units REV. B JANUARY 23, 2006 ICS843081I-01 Integrated Circuit Systems, Inc. FEMTOCLOCKS™ CRYSTAL-TO3.3V, 2.5V LVPECL CLOCK MULTIPLIER ABSOLUTE MAXIMUM RATINGS Supply Voltage, VCC 4.6V Inputs, VI -0.5V to VCC + 0.5V Outputs, IO Continuous Current Surge Current 50mA 100mA Package Thermal Impedance, θJA 101.7°C/W (0 mps) 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 beyond those listed in the DC Characteristics or AC Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability. TABLE 3A. POWER SUPPLY DC CHARACTERISTICS, VCC = VCCA = 3.3V ± 5%, TA = -40°C TO 85°C Symbol Parameter VCC Test Conditions Minimum Typical Maximum Units Core Supply Voltage 3.135 3.3 3.465 V VCCA Analog Supply Voltage 3.135 3.3 3.465 ICC Power Supply Current V 72 mA ICCA Analog Supply Current 12 mA IEE Power Supply Current 78 mA TABLE 3B. POWER SUPPLY DC CHARACTERISTICS, VCC = VCCA = 2.5V ± 5%, TA = -40°C TO 85°C Symbol Parameter Minimum Typical Maximum Units VCC Core Supply Voltage Test Conditions 2.375 2.5 2.625 V VCCA Analog Supply Voltage 2.375 2.5 2.625 V ICC Power Supply Current 60 mA ICCA Analog Supply Current 12 mA IEE Power Supply Current 73 mA TABLE 3C. LVCMOS/LVTTL DC CHARACTERISTICS, VCC = VCCA = 3.3V ± 5% OR 2.5V ± 5%, TA = -40°C TO 85°C Symbol VIH VIL Parameter Input High Voltage Input Low Voltage Test Conditions Minimum Maximum Units VCC = 3.3V 2 VCC + 0.3 V VCC = 2.5V 1.7 VCC + 0.3 V VCC = 3.3V -0.3 0.8 V VCC = 2.5V -0.3 0.7 V 5 µA IIH Input High Current VCC = VIN = 3.465V or 2.625V IIL Input Low Current VCC = 3.465V or 2.625V, VIN = 0V 843081AGI-01 Typical www.icst.com/products/hiperclocks.html 3 -150 µA REV. B JANUARY 23, 2006 ICS843081I-01 Integrated Circuit Systems, Inc. FEMTOCLOCKS™ CRYSTAL-TO3.3V, 2.5V LVPECL CLOCK MULTIPLIER TABLE 3D. LVPECL DC CHARACTERISTICS, VCC = VCCA = 3.3V ± 5% OR 2.5V ± 5%, TA = -40°C TO 85°C Symbol Parameter Test Conditions Minimum Typical Maximum Units VOH Output High Voltage; NOTE 1 VCC - 1.4 VCC - 0.9 V VOL Output Low Voltage; NOTE 1 VCC - 2.0 VCC - 1.7 V VSWING Peak-to-Peak Output Voltage Swing 0.6 1.0 V NOTE 1: Outputs terminated with 50Ω to VCC - 2V. TABLE 4. CRYSTAL CHARACTERISTICS Parameter Test Conditions Minimum Maximum Units 28 MHz Equivalent Series Resistance (ESR) 50 Ω Shunt Capacitance 7 pF Drive Level 1 mW Maximum Units 700 MHz Mode of Oscillation Typical Fundamental Frequency 19.6 TABLE 5A. AC CHARACTERISTICS, VCC = VCCA = 3.3V ± 5%, TA = -40°C TO 85°C Symbol Parameter fOUT Output Frequency RMS Phase Jitter (Random); NOTE 1 Output Rise/Fall Time t jit(Ø) t R / tF Test Conditions Minimum Typical 490 625MHz @ Integration Range: 1.875MHz - 20MHz 20% to 80% 0.32 odc Output Duty Cycle XTAL = 25MHz NOTE 1: Please refer to the Phase Noise Plot following this section. ps 125 600 ps 45 55 % Maximum Units 700 MHz TABLE 5B. AC CHARACTERISTICS, VCC = VCCA = 2.5V ± 5%, TA = -40°C TO 85°C Symbol Parameter fOUT Output Frequency RMS Phase Jitter (Random); NOTE 1 Output Rise/Fall Time t jit(Ø) t R / tF Test Conditions Minimum 490 625MHz @ Integration Range: 1.875MHz - 20MHz 20% to 80% odc Output Duty Cycle XTAL = 25MHz NOTE 1: Please refer to the Phase Noise Plot following this section. 843081AGI-01 Typical www.icst.com/products/hiperclocks.html 4 0.39 ps 125 650 ps 45 55 % REV. B JANUARY 23, 2006 ICS843081I-01 Integrated Circuit Systems, Inc. FEMTOCLOCKS™ CRYSTAL-TO3.3V, 2.5V LVPECL CLOCK MULTIPLIER TYPICAL PHASE NOISE AT 625MHZ @ 3.3V ➤ 0 -10 -20 Gb Ethernet Filter -30 -40 625MHz -50 RMS Phase Jitter (Random) 1.875MHz to 20MHz = 0.32ps (typical) -70 Raw Phase Noise Data -80 ➤ NOISE POWER dBc Hz -60 -90 -100 -110 -120 -130 -140 -150 ➤ -160 -170 -180 Phase Noise Result by adding a Gb Ethernet Filter to raw data -190 200 10 100 1k 10k 100k 1M 10M 100M OFFSET FREQUENCY (HZ) TYPICAL PHASE NOISE AT 625MHZ @ 2.5V ➤ 0 -10 -20 -30 Gb Ethernet Filter -40 -50 625MHz RMS Phase Jitter (Random) 1.875MHz to 20MHz = 0.39ps (typical) -70 Raw Phase Noise Data -80 ➤ NOISE POWER dBc Hz -60 -90 -100 -110 -120 -130 -140 -150 ➤ -160 -170 -180 Phase Noise Result by adding a Gb Ethernet Filter to raw data -190 200 10 100 1k 10k 100k 1M 10M 100M OFFSET FREQUENCY (HZ) 843081AGI-01 www.icst.com/products/hiperclocks.html 5 REV. B JANUARY 23, 2006 ICS843081I-01 Integrated Circuit Systems, Inc. FEMTOCLOCKS™ CRYSTAL-TO3.3V, 2.5V LVPECL CLOCK MULTIPLIER PARAMETER MEASUREMENT INFORMATION 2V 2V VCC , VCCA Qx SCOPE VCC, VCCA SCOPE Qx LVPECL LVPECL nQx nQx VEE VEE -0.5V ± 0.125V -1.3V ± 0.165V 3.3V OUTPUT LOAD AC TEST CIRCUIT 2.5V OUTPUT LOAD AC TEST CIRCUIT Noise Power Phase Noise Plot 80% 80% VSW I N G Clock Outputs Phase Noise Mask f1 Offset Frequency 20% 20% tR tF f2 RMS Jitter = Area Under the Masked Phase Noise Plot OUTPUT RISE/FALL TIME RMS PHASE JITTER nQ Q t PW t odc = PERIOD t PW x 100% t PERIOD OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD 843081AGI-01 www.icst.com/products/hiperclocks.html 6 REV. B JANUARY 23, 2006 ICS843081I-01 Integrated Circuit Systems, Inc. FEMTOCLOCKS™ CRYSTAL-TO3.3V, 2.5V LVPECL CLOCK MULTIPLIER APPLICATION INFORMATION POWER SUPPLY FILTERING TECHNIQUES As in any high speed analog circuitry, the power supply pins are vulnerable to random noise. The ICS843081I-01 provides separate power supplies to isolate any high switching noise from the outputs to the internal PLL. VCC and VCCA should be individually connected to the power supply plane through vias, and bypass capacitors should be used for each pin. To achieve optimum jitter performance, power supply isolation is required. Figure 1 illustrates how a 10Ω resistor along with a 10μF and a .01μF bypass capacitor should be connected to each VCCA pin. The 10Ω resistor can also be replaced by a ferrite bead. 3.3V or 2.5V VCC .01μF 10Ω V CCA .01μF 10μF FIGURE 1. POWER SUPPLY FILTERING CRYSTAL INPUT INTERFACE nant crystal and were chosen to minimize the ppm error. The optimum C1 and C2 values can be slightly adjusted for different board layouts. The ICS843081I-01 has been characterized with 18pF parallel resonant crystals. The capacitor values, C1 and C2, shown in Figure 2 below were determined using an 18pF parallel reso- XTAL_OUT C1 33p X1 18pF Parallel Crystal XTAL_IN C2 22p ICS843081I-01 Figure 2. CRYSTAL INPUt INTERFACE 843081AGI-01 www.icst.com/products/hiperclocks.html 7 REV. B JANUARY 23, 2006 ICS843081I-01 Integrated Circuit Systems, Inc. FEMTOCLOCKS™ CRYSTAL-TO3.3V, 2.5V LVPECL CLOCK MULTIPLIER TERMINATION FOR 3.3V LVPECL OUTPUT The clock layout topology shown below is a typical termination for LVPECL outputs. The two different layouts mentioned are recommended only as guidelines. to drive 50Ω transmission lines. Matched impedance techniques should be used to maximize operating frequency and minimize signal distortion. Figures 3A and 3B show two different layouts which are recommended only as guidelines. Other suitable clock layouts may exist and it would be recommended that the board designers simulate to guarantee compatibility across all printed circuit and clock component process variations. FOUT and nFOUT are low impedance follower outputs that generate ECL/LVPECL compatible outputs. Therefore, terminating resistors (DC current path to ground) or current sources must be used for functionality. These outputs are designed 3.3V Zo = 50Ω 125Ω FOUT FIN Zo = 50Ω Zo = 50Ω FOUT 50Ω 1 RTT = Z ((VOH + VOL) / (VCC – 2)) – 2 o FIN 50Ω Zo = 50Ω VCC - 2V RTT 84Ω FIGURE 3A. LVPECL OUTPUT TERMINATION 843081AGI-01 125Ω 84Ω FIGURE 3B. LVPECL OUTPUT TERMINATION www.icst.com/products/hiperclocks.html 8 REV. B JANUARY 23, 2006 ICS843081I-01 Integrated Circuit Systems, Inc. FEMTOCLOCKS™ CRYSTAL-TO3.3V, 2.5V LVPECL CLOCK MULTIPLIER TERMINATION FOR 2.5V LVPECL OUTPUT Figure 4A and Figure 4B show examples of termination for 2.5V LVPECL driver. These terminations are equivalent to terminating 50Ω to VCC - 2V. For VCC = 2.5V, the VCC - 2V is very close to ground level. The R3 in Figure 4B can be eliminated and the termination is shown in Figure 4C. 2.5V VCC=2.5V 2.5V 2.5V VCC=2.5V R1 250 Zo = 50 Ohm R3 250 + Zo = 50 Ohm + Zo = 50 Ohm - Zo = 50 Ohm 2,5V LVPECL Driv er - R1 50 2,5V LVPECL Driv er R2 62.5 R2 50 R4 62.5 R3 18 FIGURE 4B. 2.5V LVPECL DRIVER TERMINATION EXAMPLE FIGURE 4A. 2.5V LVPECL DRIVER TERMINATION EXAMPLE 2.5V VCC=2.5V Zo = 50 Ohm + Zo = 50 Ohm 2,5V LVPECL Driv er R1 50 R2 50 FIGURE 4C. 2.5V LVPECL TERMINATION EXAMPLE 843081AGI-01 www.icst.com/products/hiperclocks.html 9 REV. B JANUARY 23, 2006 ICS843081I-01 Integrated Circuit Systems, Inc. FEMTOCLOCKS™ CRYSTAL-TO3.3V, 2.5V LVPECL CLOCK MULTIPLIER POWER CONSIDERATIONS This section provides information on power dissipation and junction temperature for the ICS843081I-01. Equations and example calculations are also provided. 1. Power Dissipation. The total power dissipation for the ICS843081I-01 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. • • Power (core)MAX = VCC_MAX * IEE_TYP = 3.465V * 78mA = 270.27mW Power (outputs)MAX = 30mW/Loaded Output pair Total Power_MAX (3.465V, with all outputs switching) = 270.27mW + 30mW = 300.27mW 2. Junction Temperature. Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad and directly affects the reliability of the device. The maximum recommended junction temperature for HiPerClockSTM devices is 125°C. The equation for Tj is as follows: Tj = θJA * Pd_total + TA Tj = Junction Temperature θJA = Junction-to-Ambient Thermal Resistance Pd_total = Total Device Power Dissipation (example calculation is in section 1 above) TA = Ambient Temperature In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance θJA must be used. Assuming a moderate air flow of 1 meter per second and a multi-layer board, the appropriate value is 90.5°C/W per Table 6 below. Therefore, Tj for an ambient temperature of 85°C with all outputs switching is: 85°C + 0.300W * 90.5°C/W = 112°C. This is below the limit of 125°C. This calculation is only an example. Tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow, and the type of board (single layer or multi-layer). TABLE 6. THERMAL RESISTANCE θJA FOR 8-PIN TSSOP, FORCED CONVECTION θJA by Velocity (Meters per Second) Multi-Layer PCB, JEDEC Standard Test Boards 843081AGI-01 0 1 2.5 101.7°C/W 90.5°C/W 89.8°C/W www.icst.com/products/hiperclocks.html 10 REV. B JANUARY 23, 2006 ICS843081I-01 Integrated Circuit Systems, Inc. FEMTOCLOCKS™ CRYSTAL-TO3.3V, 2.5V LVPECL CLOCK MULTIPLIER 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 5. VCC Q1 VOUT RL 50 VCC - 2V FIGURE 5. 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, VOUT = V OH_MAX (V CCO_MAX • -V OH_MAX OL_MAX CCO_MAX -V CC_MAX – 0.9V ) = 0.9V For logic low, VOUT = V (V =V =V CC_MAX – 1.7V ) = 1.7V 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 OH_MAX – (V CC_MAX - 2V))/R ] * (V CC_MAX L -V OH_MAX ) = [(2V - (V CC_MAX -V OH_MAX ))/R ] * (V CC_MAX L -V OH_MAX )= [(2V - 0.9V)/50Ω] * 0.9V = 19.8mW Pd_L = [(V OL_MAX – (V CC_MAX - 2V))/R ] * (V L CC_MAX -V OL_MAX ) = [(2V - (V CC_MAX -V OL_MAX ))/R ] * (V L CC_MAX -V OL_MAX )= [(2V - 1.7V)/50Ω] * 1.7V = 10.2mW Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW 843081AGI-01 www.icst.com/products/hiperclocks.html 11 REV. B JANUARY 23, 2006 ICS843081I-01 Integrated Circuit Systems, Inc. FEMTOCLOCKS™ CRYSTAL-TO3.3V, 2.5V LVPECL CLOCK MULTIPLIER RELIABILITY INFORMATION TABLE 7. θJAVS. AIR FLOW TABLE FOR 8 LEAD TSSOP θJA by Velocity (Meters per Second) Multi-Layer PCB, JEDEC Standard Test Boards 0 1 2.5 101.7°C/W 90.5°C/W 89.8°C/W TRANSISTOR COUNT The transistor count for ICS843081I-01 is: 1697 843081AGI-01 www.icst.com/products/hiperclocks.html 12 REV. B JANUARY 23, 2006 ICS843081I-01 Integrated Circuit Systems, Inc. PACKAGE OUTLINE - G SUFFIX FOR FEMTOCLOCKS™ CRYSTAL-TO3.3V, 2.5V LVPECL CLOCK MULTIPLIER 8 LEAD TSSOP TABLE 8. PACKAGE DIMENSIONS SYMBOL Millimeters Minimum N A Maximum 8 -- 1.20 A1 0.05 0.15 A2 0.80 1.05 b 0.19 0.30 c 0.09 0.20 D 2.90 3.10 E E1 6.40 BASIC 4.30 e 4.50 0.65 BASIC L 0.45 0.75 α 0° 8° aaa -- 0.10 Reference Document: JEDEC Publication 95, MO-153 843081AGI-01 www.icst.com/products/hiperclocks.html 13 REV. B JANUARY 23, 2006 ICS843081I-01 Integrated Circuit Systems, Inc. FEMTOCLOCKS™ CRYSTAL-TO3.3V, 2.5V LVPECL CLOCK MULTIPLIER TABLE 9. ORDERING INFORMATION Part/Order Number Marking Package Shipping Packaging Temperature ICS843081AGI-01 1AI01 8 lead TSSOP tube -40°C to 85°C ICS843081AGI-01T 1AI01 8 lead TSSOP 2500 tape & reel -40°C to 85°C ICS843081AGI-01LF AI01L 8 lead "Lead-Free" TSSOP tube -40°C to 85°C ICS843081AGI-01LFT AI01L 8 lead "Lead-Free" TSSOP 2500 tape & reel -40°C to 85°C NOTE: Par ts that are ordered with an "LF" suffix to the par t number are the Pb-Free configuration and are RoHS compliant. The aforementioned trademarks, HiPerClockS and FemtoClocks are trademarks of Integrated Circuit Systems, Inc. or its subsidiaries in the United States and/or other countries. While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems, Incorporated (ICS) assumes no responsibility for either its use or for infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial and industrial applications. Any other applications such as those requiring high reliability or other extraordinary environmental requirements are not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or critical medical instruments. 843081AGI-01 www.icst.com/products/hiperclocks.html 14 REV. B JANUARY 23, 2006 ICS843081I-01 Integrated Circuit Systems, Inc. FEMTOCLOCKS™ CRYSTAL-TO3.3V, 2.5V LVPECL CLOCK MULTIPLIER REVISION HISTORY SHEET Rev B 843081AGI-01 Table T5A Page 1 4 T5B 4 T9 5 14 Description of Change Features Section - corrected RMS Phase Jitter value. 3.3V AC Characteristics Table - changed RMS Phase Jitter from 0.26ps typical to 0.32ps typical. 2.5V AC Characteristics Table - changed RMS Phase Jitter from 0.27ps typical to 0.39ps typical. Updated Typical Phase Noise Plots. Ordering Information Table - added lead-free marking. www.icst.com/products/hiperclocks.html 15 Date 1/23/06 REV. B JANUARY 23, 2006