PRELIMINARY Integrated Circuit Systems, Inc. ICS840004-11 FEMTOCLOCKS™ CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER GENERAL DESCRIPTION FEATURES The ICS840004-11 is a 4 output LVCMOS/ LVTTL Synthesizer optimized to generate HiPerClockS™ Ethernet reference clock frequencies and is a member of the HiPerClocks TM family of high performance clock solutions from ICS. Using a 25MHz, 18pF parallel resonant crystal, 125MHz and 62.5MHz can be generated based on one frequency select pin (F_SEL). The ICS840004-11 uses ICS’ 3rd generation low phase noise VCO technology and can achieve 1ps or lower typical random rms phase jitter, easily meeting Ethernet jitter requirements. The ICS840004-11 is packaged in a small 20-pin TSSOP package. • Four LVCMOS/LVTTL outputs, 15Ω typical output impedance ICS • Crystal oscillator interface • Input frequency range: 22.4MHz to 28MHz • Output frequency Range: 56MHz - 140MHz • VCO Range: 560MHz - 700MHz • RMS phase jitter at 125MHz (1.875MHz - 20MHz): 0.70ps (typical) • RMS phase noise at 125MHz: • Full 3.3V supply • 0°C to 70°C ambient operating temperature • Available in both standard and lead-free RoHS-compliant packages FREQUENCY SELECT FUNCTION TABLE F_SEL 0 Inputs M Divider N Divider Value Value 25 10 1 25 FOR ETHERNET FREQUENCIES M/N Ratio Value 2.5 5 5 Output Frequency (25MHz Ref.) 62.5 125 BLOCK DIAGRAM PIN ASSIGNMENT OE Pullup F_SEL Pullup F_SEL 25MHz XTAL_IN OSC Phase Detector VCO XTAL_OUT N 0 ÷10 1 ÷5 Q0 Q1 Q2 M = ÷25 (fixed) Q3 F_SEL nc nc nc OE nc nc VDDA nc VDD 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 nc GND Q0 Q1 VDDO Q2 Q3 GND XTAL_IN XTAL_OUT ICS840004-11 20-Lead TSSOP 6.5mm x 4.4mm 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. 840004AG-11 www.icst.com/products/hiperclocks.html 1 REV. A OCTOBER 3, 2005 PRELIMINARY Integrated Circuit Systems, Inc. ICS840004-11 FEMTOCLOCKS™ CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER TABLE 1. PIN DESCRIPTIONS Number Name 1 2, 3, 4, 6, 7, 9, 20 F_SEL Input Type nc Unused 5 OE Input 8 VDDA Power 10 11, 12 13, 19 14, 15 17, 18 16 VDD XTAL_OUT, XTAL_IN GND Q3, Q2, Q1, Q0 VDDO Power Description Pullup Frequency select pin. LVCMOS/LVTTL interface levels. No connect. Pullup Output enable pin. When HIGH, the outputs are active. When LOW, the outputs are in a high impedance state. LVCMOS/LVTTL interface levels. Analog supply pin. Core supply pin. Cr ystal oscillator interface. XTAL_OUT is the output. XTAL_IN is the input. Power supply ground. Single-ended clock outputs. LVCMOS/LVTTL interface levels. 15Ω typical output impedence. Output supply pin. Input Power Output Power NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values. TABLE 2. PIN CHARACTERISTICS Symbol Parameter CIN Input Capacitance Test Conditions Minimum Typical 4 Maximum Units pF CPD Power Dissipation Capacitance TBD pF RPULLUP Input Pullup Resistor 51 kΩ ROUT Output Impedance 15 Ω 840004AG-11 VDD, VDDA, VDDO = 3.465V www.icst.com/products/hiperclocks.html 2 REV. A OCTOBER 3, 2005 PRELIMINARY Integrated Circuit Systems, Inc. ICS840004-11 FEMTOCLOCKS™ CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER ABSOLUTE MAXIMUM RATINGS Supply Voltage, VDD 4.6V Inputs, VI -0.5V to VDD + 0.5 V Outputs, VO -0.5V to VDDO + 0.5V Package Thermal Impedance, θJA 73.2°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 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, VDDD = VDDA = VDDO = 3.3V±5%, TA = 0°C TO 70°C Symbol VDD Parameter Core Supply Voltage Test Conditions Minimum 3.135 Typical 3.3 Maximum 3.465 Units V VDDA Analog Supply Voltage 3.135 3.3 3.465 V VDDO Output Supply Voltage 3.135 3.3 3.465 V IDD Power Supply Current 90 mA IDDA IDDO Analog Supply Current Output Supply Current 8 5 mA mA TABLE 3B. LVCMOS/LVTTL DC CHARACTERISTICS, VDDD = VDDA = VDDO = 3.3V±5%, TA = 0°C TO 70°C Symbol Parameter VIH Input High Voltage Test Conditions Minimum Typical Maximum Units 2 VDD + 0.3 V -0.3 0.8 V 5 µA VIL Input Low Voltage IIH Input High Current OE, F_SEL VDD = VIN = 3.465V IIL Input Low Current OE, F_SEL VDD = 3.465V, VIN = 0V -150 µA VOH Output High Voltage; NOTE 1 VDDO = 3.3V ± 5% 2.6 V VOL Output Low Voltage; NOTE 1 VDDO = 3.3V ± 5% 0. 5 V NOTE 1: Outputs terminated with 50Ω to VDDO/2. See Parameter Measurement Information, 3.3V Output Load Test Circuit. TABLE 4. CRYSTAL CHARACTERISTICS Parameter Test Conditions Mode of Oscillation Minimum Typical Maximum Units Fundamental Frequency 25 MHz Equivalent Series Resistance (ESR) 50 Ω Shunt Capacitance 7 pF Drive Level 1 mW NOTE: Characterized using an 18pF parallel resonant cr ystal. 840004AG-11 www.icst.com/products/hiperclocks.html 3 REV. A OCTOBER 3, 2005 PRELIMINARY Integrated Circuit Systems, Inc. ICS840004-11 FEMTOCLOCKS™ CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER TABLE 5A. AC CHARACTERISTICS, VDD = VDDA = VDDO = 3.3V±5%, TA = 0°C TO 70°C Symbol Parameter fOUT Output Frequency Range tsk(o) Output Skew; NOTE 1, 2 tjit(Ø) tR / tF RMS Phase Jitter (Random); NOTE 3 Output Rise/Fall Time Test Conditions Minimum Typical 56 125MHz @ Integration Range: 1.875MHz - 20MHz 62.5MHz @ Integration Range: 1.875MHz - 20MHz 20% to 80% www.icst.com/products/hiperclocks.html 4 Units 140 MHz 25 ps 0.70 ps 0.54 ps 470 ps odc Output Duty Cycle 50 NOTE 1: Defined as skew between outputs at the same supply voltages and with equal load conditions. Measured at VDDO/2. NOTE 2: This parameter is defined in accordance with JEDEC Standard 65. NOTE 3: Please refer to the Phase Noise Plot. 840004AG-11 Maximum % REV. A OCTOBER 3, 2005 PRELIMINARY Integrated Circuit Systems, Inc. FEMTOCLOCKS™ CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER TYPICAL PHASE NOISE AT 62.5MHZ @3.3V ➤ 0 -10 -20 1Gb Ethernet Filter -30 NOISE POWER dBc Hz ICS840004-11 -40 62.5MHz -50 RMS Phase Jitter (Random) 1.875MHz to 20MHz = 0.54ps -60 -70 -80 -90 -100 Raw Phase Noise Data -110 ➤ -120 -130 -140 -150 ➤ -160 -170 -180 Phase Noise Result by adding 1Gb Ethernet Filter to raw data -190 100 1k 10k 100k 1M 10M 100M OFFSET FREQUENCY (HZ) TYPICAL PHASE NOISE 0 AT 125MHZ @2.5V ➤ -10 -20 1Gb Ethernet Filter NOISE POWER dBc Hz -30 -40 125MHz -50 RMS Phase Jitter (Random) 1.875MHz to 20MHz = 0.70ps -60 -70 -80 -90 -100 Raw Phase Noise Data -110 ➤ -120 -130 -140 -150 ➤ -160 -170 Phase Noise Result by adding 1Gb Ethernet Filter to raw data -180 -190 100 840004AG-11 1k 10k 100k OFFSET FREQUENCY (HZ) www.icst.com/products/hiperclocks.html 5 1M 10M 100M REV. A OCTOBER 3, 2005 PRELIMINARY Integrated Circuit Systems, Inc. ICS840004-11 FEMTOCLOCKS™ CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER PARAMETER MEASUREMENT INFORMATION 1.65V±5% V SCOPE VDD, VDDA, VDDO DDO Qx 2 Qx LVCMOS V DDO Qy GND 2 tsk(o) -1.65V±5% 3.3V CORE/3.3V OUTPUT LOAD AC TEST CIRCUIT OUTPUT SKEW Phase Noise Plot V DDO 2 Noise Power Q0:Q3 t PW t Phase Noise Mask odc = Offset Frequency f1 PERIOD t PW x 100% t PERIOD f2 RMS Jitter = Area Under the Masked Phase Noise Plot OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD RMS PHASE JITTER 80% Clock Outputs 80% 20% 20% tR tF OUTPUT RISE/FALL TIME 840004AG-11 www.icst.com/products/hiperclocks.html 6 REV. A OCTOBER 3, 2005 PRELIMINARY Integrated Circuit Systems, Inc. ICS840004-11 FEMTOCLOCKS™ CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER APPLICATION INFORMATION POWER SUPPLY FILTERING TECHNIQUES As in any high speed analog circuitry, the power supply pins are vulnerable to random noise. The ICS840004-11 provides separate power supplies to isolate any high switching noise from the outputs to the internal PLL. VDD, VDDA, and VDDO 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 VDDA. 3.3V VDD .01μF 10Ω VDDA .01μF 10μF FIGURE 1. POWER SUPPLY FILTERING CRYSTAL INPUT INTERFACE The ICS840004-11 has been characterized with 18pF parallel resonant crystals. The capacitor values shown in Figure 2 below were determined using a 25MHz 18pF parallel resonant crystal and were chosen to minimize the ppm error. XTAL_IN C1 22p X1 18pF Parallel Cry stal XTAL_OUT C2 22p ICS84332 Figure 2. CRYSTAL INPUt INTERFACE RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS INPUTS: OUTPUTS: CRYSTAL INPUT: For applications not requiring the use of the crystal oscillator input, both XTAL_IN and XTAL_OUT can be left floating. Though not required, but for additional protection, a 1kΩ resistor can be tied from XTAL_IN to ground. LVCMOS OUTPUT: All unused LVCMOS output can be left floating. We recommend that there is no trace attached. LVCMOS CONTROL PINS: All control pins have internal pull-ups or pull-downs; additional resistance is not required but can be added for additional protection. A 1kΩ resistor can be used. 840004AG-11 www.icst.com/products/hiperclocks.html 7 REV. A OCTOBER 3, 2005 PRELIMINARY Integrated Circuit Systems, Inc. ICS840004-11 FEMTOCLOCKS™ CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER RELIABILITY INFORMATION TABLE 6. θJAVS. AIR FLOW TABLE FOR 20 LEAD TSSOP θJA by Velocity (Linear Feet per Minute) Single-Layer PCB, JEDEC Standard Test Boards Multi-Layer PCB, JEDEC Standard Test Boards 0 200 500 114.5°C/W 73.2°C/W 98.0°C/W 66.6°C/W 88.0°C/W 63.5°C/W NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs. TRANSISTOR COUNT The transistor count for ICS840004-11 is: 1795 840004AG-11 www.icst.com/products/hiperclocks.html 8 REV. A OCTOBER 3, 2005 PRELIMINARY Integrated Circuit Systems, Inc. PACKAGE OUTLINE - G SUFFIX ICS840004-11 FEMTOCLOCKS™ CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER FOR 20 LEAD TSSOP TABLE 7. PACKAGE DIMENSIONS Millimeters SYMBOL MIN N MAX 20 A -- 1.20 A1 0.05 0.15 A2 0.80 1.05 b 0.19 0.30 c 0.09 0.20 D 6.40 E E1 6.60 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 840004AG-11 www.icst.com/products/hiperclocks.html 9 REV. A OCTOBER 3, 2005 PRELIMINARY Integrated Circuit Systems, Inc. ICS840004-11 FEMTOCLOCKS™ CRYSTAL-TOLVCMOS/LVTTL FREQUENCY SYNTHESIZER TABLE 8. ORDERING INFORMATION Part/Order Number Marking Package Shipping Packaging Temperature ICS840004AG-11 ICS840004A11 20 Lead TSSOP tube 0°C to 70°C ICS840004AG-11T ICS840004A11 20 Lead TSSOP 2500 tape & reel 0°C to 70°C ICS840004AG-11LF ICS40004A11L 20 Lead "Lead-Free" TSSOP tube 0°C to 70°C ICS840004AG-11LFT ICS40004A11L 20 Lead "Lead-Free" TSSOP 2500 tape & reel 0°C to 70°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. 840004AG-11 www.icst.com/products/hiperclocks.html 10 REV. A OCTOBER 3, 2005