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Integrated Circuit Systems, Inc. ICS840031I FEMTOCLOCKSTM CRYSTAL-TOLVCMOS/LVTTL CLOCK GENERATOR FEATURES * (1) LVCMOS/LVTTL output * Crystal oscillator interface designed for a 24.576MHz, 18pF parallel resonant crystal * Output frequency: 98.304MHz (typical) * VCO range: 490MHz to 640MHz * RMS phase jitter @ 98.304MHz, using a 24.576MHz crystal (12KHz - 20MHz): 0.75ps (typical) * RMS phase noise at 98.304MHz (typical) Offset Noise Power 100Hz .............. -103.3 dBc/Hz 1KHz .............. -126.2 dBc/Hz 10KHz .............. -134.2 dBc/Hz 100KHz .............. -132.9 dBc/Hz * 3.3V core/1.8V output operating supply * Lead-Free fully RoHS compliant * -40C to 85C ambient operating temperature GENERAL DESCRIPTION The ICS840031I is an IEEE 1394b Clock Generator and a member of the HiPerClocksTM HiPerClockSTM family of high performance devices from ICS. The ICS840031I uses a 24.576MHz crystal to synthesize 98.304MHz. The ICS840031I has excellent phase jitter performance, from 12KHz - 20MHz integration range. The ICS840031I is packaged in a small 8-pin SOIC, making it ideal for use in systems with limited board space. ICS FREQUENCY TABLE Inputs Crystal Frequency (MHz) 24.576 Output Frequency (MHz) 98.304 BLOCK DIAGRAM PLL_SEL (Pullup) PIN ASSIGNMENT 0 VDD XTAL_OUT XTAL_IN VDDA 1 2 3 4 8 7 6 5 VDDO Q0 GND PLL_SEL XTAL_IN Q0 OSC XTAL_OUT Phase Detector VCO 589.824MHz w/ 24.576MHz Ref. /6 1 ICS840031I 8-Lead SOIC 3.90mm x 4.90mm x 1.37mm package body M Package Top View M = /24 (fixed) 840031AMI www.icst.com/products/hiperclocks.html 1 REV. A FEBRUARY 24, 2005 Integrated Circuit Systems, Inc. ICS840031I FEMTOCLOCKSTM CRYSTAL-TOLVCMOS/LVTTL CLOCK GENERATOR Type Power Input Power Input Power Pullup Description Core supply pin. Cr ystal oscillator interface. XTAL_IN is the input, XTAL_OUT is the output. Analog supply pin. PLL select pin. LVCMOS/LVTTL interface levels. Power supply ground. Single-ended clock output. LVCMOS/LVTTL interface levels. Output supply pin. TABLE 1. PIN DESCRIPTIONS Number 1 2, 3 4 5 6 7 8 Name VDD XTAL_OUT, XTAL_IN VDDA PLL_SEL GND Q0 VDDO Output Power NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values. TABLE 2. PIN CHARACTERISTICS Symbol CIN CPD RPULLUP ROUT Parameter Input Capacitance Power Dissipation Capacitance Input Pullup Resistor Output Impedance VDD = VDDA = 3.465V, VDDO = 1.89V Test Conditions Minimum Typical 4 18 51 10 Maximum Units pF pF k 840031AMI www.icst.com/products/hiperclocks.html 2 REV. A FEBRUARY 24, 2005 Integrated Circuit Systems, Inc. ICS840031I FEMTOCLOCKSTM CRYSTAL-TOLVCMOS/LVTTL CLOCK GENERATOR 4.6V -0.5V to VDD + 0.5 V -0.5V to VDDO + 0.5V 112.7C/W (0 lfpm) -65C to 150C 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. ABSOLUTE MAXIMUM RATINGS Supply Voltage, VDD Inputs, VI Outputs, VO Package Thermal Impedance, JA Storage Temperature, TSTG TABLE 3A. POWER SUPPLY DC CHARACTERISTICS, VDD = VDDA = 3.3V5%, VDDO = 1.8V5%, TA = -40C TO 85C Symbol VDD VDDA VDDO IDD IDDA IDDO Parameter Core Supply Voltage Analog Supply Voltage Output Supply Voltage Power Supply Current Analog Supply Current Output Supply Current Test Conditions Minimum 3.135 3.135 1.71 Typical 3.3 3.3 1.8 Maximum 3.465 3.465 1.89 55 12 5 Units V V V mA mA mA TABLE 3B. LVCMOS/LVTTL DC CHARACTERISTICS, VDD = VDDA = 3.3V5%, VDDO = 1.8V5%, TA = -40C TO 85C Symbol VIH VIL IIH IIL VOH Parameter Input High Voltage Input Low Voltage Input High Current Input Low Current PLL_SEL PLL_SEL VDD = VIN = 3.465V VDD = 3.465V, VIN = 0V -150 1.5 0.4 Test Conditions Minimum 2 -0.3 Typical Maximum VDD + 0.3 0.8 5 Units V V A A V V Output High Voltage; NOTE 1 VOL Output Low Voltage; NOTE 1 NOTE 1: Outputs terminated with 50 to VDD/2. See Parameter Measurement Information Section, "3.3V/1.8V Output Load Test Circuit". TABLE 4. CRYSTAL CHARACTERISTICS Parameter Mode of Oscillation Frequency Equivalent Series Resistance (ESR) Shunt Capacitance F_SEL = 1 20.417 Test Conditions Minimum Typical Fundamental 24.576 26.667 50 7 MHz pF Maximum Units TABLE 5. AC CHARACTERISTICS, VDD = VDDA = 3.3V5%, VDDO = 1.8V5%, TA = -40C TO 85C Symbol fOUT Parameter Output Frequency RMS Phase Jitter (Random); NOTE 1 Output Rise/Fall Time Test Conditions fOUT = 98.304MHz, (12KHz to 20MHz) 20% to 80% Minimum 81.67 Typical 98.304 0.75 0.2 46 1 54 Maximum 106.67 Units MHz ps ns % tjit(O) tR / tF odc Output Duty Cycle NOTE 1: Please refer to the Phase Noise Plot. 840031AMI www.icst.com/products/hiperclocks.html 3 REV. A FEBRUARY 24, 2005 Integrated Circuit Systems, Inc. ICS840031I FEMTOCLOCKSTM CRYSTAL-TOLVCMOS/LVTTL CLOCK GENERATOR TYPICAL PHASE NOISE AT 98.304MHZ -10 -20 -30 -40 -50 Filter 98.304MHz RMS Phase Jitter (Random) 12KHz to 20MHz = 0.75ps (typical) 0 NOISE POWER dBc Hz -60 -70 -80 -90 -100 -110 -120 -130 -140 -150 -160 -170 -180 -190 10 100 1k 10k 100k 1M 10M 100M Raw Phase Noise Data Phase Noise Result by adding a Filter to raw data OFFSET FREQUENCY (HZ) www.icst.com/products/hiperclocks.html 4 840031AMI REV. A FEBRUARY 24, 2005 Integrated Circuit Systems, Inc. ICS840031I FEMTOCLOCKSTM CRYSTAL-TOLVCMOS/LVTTL CLOCK GENERATOR PARAMETER MEASUREMENT INFORMATION 2.40.9V 0.9V5% Phase Noise Plot Noise Power VDD, VDDA SCOPE VDDO GND Qx Phase Noise Mask LVCMOS f1 Offset Frequency f2 -0.9V5% RMS Jitter = Area Under the Masked Phase Noise Plot 3.3V/1.8V OUTPUT LOAD AC TEST CIRCUIT RMS PHASE JITTER V DD 80% 20% tR 80% 20% tF Q0 Pulse Width t 2 PERIOD Clock Outputs odc = t PW t PERIOD OUTPUT DUTY CYCLE/PULSE WIDTH/PERIOD OUTPUT RISE/FALL TIME 840031AMI www.icst.com/products/hiperclocks.html 5 REV. A FEBRUARY 24, 2005 Integrated Circuit Systems, Inc. ICS840031I FEMTOCLOCKSTM CRYSTAL-TOLVCMOS/LVTTL CLOCK GENERATOR APPLICATION INFORMATION POWER SUPPLY FILTERING TECHNIQUES As in any high speed analog circuitry, the power supply pins are vulnerable to random noise. The ICS840031I 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 10 resistor along with a 10F and a .01F bypass capacitor should be connected to each VDDA pin. 3.3V VDD .01F V DDA .01F 10F 10 FIGURE 1. POWER SUPPLY FILTERING CRYSTAL INPUT INTERFACE The ICS840031I has been characterized with 18pF parallel resonant crystals. The capacitor values, C1 and C2, shown in Figure 2 below were determined using a 24.576MHz, 18pF parallel resonant crystal and were chosen to minimize the ppm error. The optimum C1 and C2 values can be slightly adjusted for different board layouts. XTAL_OUT C1 33p X1 18pF Parallel Crystal XTAL_IN C2 22p Figure 2. CRYSTAL INPUt INTERFACE 840031AMI www.icst.com/products/hiperclocks.html 6 REV. A FEBRUARY 24, 2005 Integrated Circuit Systems, Inc. ICS840031I FEMTOCLOCKSTM CRYSTAL-TOLVCMOS/LVTTL CLOCK GENERATOR example, an 18pF parallel resonant crystal is used. The C1=22pF and C2=33pF are approximate values for frequency accuracy. The C1 and C2 may be slightly adjusted for optimizing frequency accuracy. APPLICATION SCHEMATIC EXAMPLE Figure 3 shows a schematic example of the ICS840031I. In this example, a series termination, one of LVCMOS termination approaches, is shown. Additional LVCMOS termination approaches are shown in the LVCMOS Termination Application Note. In this VDD VDD C6 0.1u VDDO R1 1K R3 40 Zo = 50 Ohm U1 1 2 3 4 VDD XTAL_OUT XTAL_IN VDDA VDDO Q0 GND PLL_SEL C2 33pF 8 7 6 5 X1 CL=18pF C1 22pF LVCMOS ICS840031I C5 0.1u VDD R2 10 C3 10uF VDDA C4 0.1u VDD=3.3V VDDO=1.8V FIGURE 3. ICS840031I APPLICATION SCHEMATIC EXAMPLE RELIABILITY INFORMATION TABLE 6. JAVS. AIR FLOW TABLE FOR 8 LEAD SOIC JA by Velocity (Linear Feet per Minute) 0 200 128.5C/W 103.3C/W 500 115.5C/W 97.1C/W Single-Layer PCB, JEDEC Standard Test Boards Multi-Layer PCB, JEDEC Standard Test Boards 153.3C/W 112.7C/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 ICS840031I is: 1787 840031AMI www.icst.com/products/hiperclocks.html 7 REV. A FEBRUARY 24, 2005 Integrated Circuit Systems, Inc. ICS840031I FEMTOCLOCKSTM CRYSTAL-TOLVCMOS/LVTTL CLOCK GENERATOR 8 LEAD SOIC PACKAGE OUTLINE - M SUFFIX FOR TABLE 7. PACKAGE DIMENSIONS SYMBOL N A A1 B C D E e H h L 5.80 0.25 0.40 0 1.35 0.10 0.33 0.19 4.80 3.80 1.27 BASIC 6.20 0.50 1.27 8 Millimeters MINIMUN 8 1.75 0.25 0.51 0.25 5.00 4.00 MAXIMUM Reference Document: JEDEC Publication 95, MS-012 840031AMI www.icst.com/products/hiperclocks.html 8 REV. A FEBRUARY 24, 2005 Integrated Circuit Systems, Inc. ICS840031I FEMTOCLOCKSTM CRYSTAL-TOLVCMOS/LVTTL CLOCK GENERATOR Marking 840031AI 840031AI 40031AIL 40031AIL Package 8 lead SOIC 8 lead SOIC 8 lead "Lead-Free" SOIC 8 lead "Lead-Free" SOIC Count tube 2500 tape & reel tube 2500 tape & reel Temperature -40C to 85C -40C to 85C -40C to 85C -40C to 85C TABLE 8. ORDERING INFORMATION Part/Order Number ICS840031AMI ICS840031AMIT ICS840031AMILF ICS840031AMILFT The aforementioned trademarks, HiPerClockSTM and FemtoClocksTM are a trademark 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. 840031AMI www.icst.com/products/hiperclocks.html 9 REV. A FEBRUARY 24, 2005 |
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