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| Micrel, Inc. 3.3V 200MHz PRECISION SPREADSPECTRUM CLOCK SYNTHESIZER Precision Edge SY89529L Precision Edge(R) SY89529L (R) FEATURES s Low voltage, 3.3V power supply operation s 200MHz precision LVPECL output from a low cost 16.66MHz crystal s 0.5% spread-spectrum modulation control s > 7dB reduction in EMI with spread-spectrum modulation s LVTTL/LVCMOS compatible control inputs s interfaces directly to a crystal s Precision PLL architecture ensures < 30ps peak-to-peak, cycle-to-cycle output jitter s 48%-to-52% precision duty cycle is ideal for doubledata-rate clocking applications s Available in low cost 32-pin TQFP and 28-pin SOIC packages DESCRIPTION The SY89529L is a high-speed, precision PLL-based LVPECL clock synthesizer with spread-spectrum modulation control. With an external 16.66MHz crystal providing a reference frequency to the internal PLL, the differential PECL output frequency will be 200MHz with < 30ps (20ps typ.) peak-to-peak, cycle-to-cycle output jitter. The SY89529L spread-spectrum mode operates with a 30kHz triangle modulation with 0.5% down-spread (+0.0%/ -0.5%). When spread-spectrum is activated, the output signal is modulated which spreads the peak amplitudes and, thus, decreases EMI (Electro-Magnetic Interference). APPLICATIONS s s s s High-speed synchronous systems CPU clock Multi-processor workstations and servers Networking M9999-110405 hbwhelp@micrel.com or (408) 955-1690 Rev.: E Amendment: /0 1 Issue Date: October 2005 Micrel, Inc. Precision Edge(R) SY89529L PACKAGE/ORDERING INFORMATION NC NC NC NC NC NC NC NC NC 1 2 3 4 5 6 7 8 9 TOP VIEW SOIC Z28-1 28 NC 27 VCC1 26 XTAL2 25 XTAL1 24 LOOP_REF 23 LOOP_FILTER 22 VCC_ANALOG 21 GND_ANALOG 20 NC 19 NC 18 VCC_OUT 17 FOUT 16 /FOUT 15 GND OUTPUT Ordering Information(1) Part Number SY89529LZC SY89529LZCTR(2) SY89529LTC SY89529LTCTR(2) SY89529LZH(3) SY89529LZHTR(2, 3) SY89529LTH(3) SY89529LTHTR(2, 3) Package Operating Type Range Z28-1 Z28-1 T32-1 T32-1 Z28-1 Z28-1 T32-1 T32-1 Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Package Marking SY89529LZC SY89529LZC SY89529LTC SY89529LTC Lead Finish Sn-Pb Sn-Pb Sn-Pb Sn-Pb SY89529LZH with Pb-Free Pb-Free bar-line indicator NiPdAu SY89529LZH with Pb-Free Pb-Free bar-line indicator NiPdAu SY89529LTH with Pb-Free Pb-Free bar-line indicator NiPdAu SY89529LTH with Pb-Free Pb-Free bar-line indicator NiPdAu SSC CONTROL(0) 10 SSC CONTROL(1) 11 GND_TTL 12 TEST INPUT 13 VCC_TTL 14 28-Pin SOIC (Z28-1) Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25C, DC Electricals only. 2. Tape and Reel. 3. Pb-Free package is recommended for new designs. /FOUT GND OUTPUT VCC_TTL VCC_OUT FOUT TEST INPUT GND_TTL NC NC NC GND_ANALOG VCC_ANALOG LOOP_FILTER LOOP_REF XTAL1 1 2 3 4 5 6 7 8 32 31 30 29 28 27 26 NC 25 24 23 22 TQFP TOP VIEW T32-1* 21 20 19 18 17 SSC CONTROL(1) SSC CONTROL(0) NC NC NC NC NC NC 9 10 11 12 13 14 15 16 VCC1 XTAL2 NC NC NC NC NC 32-Pin TQFP (T32-1) M9999-110405 hbwhelp@micrel.com or (408) 955-1690 NC 2 Micrel, Inc. Precision Edge(R) SY89529L BLOCK DIAGRAM INTERFACE LOGIC /4 PHASE DETECTOR PLL 16.66MHz XTAL OSC /M VCO FOUT /N /FOUT 200MHz Spread Spectrum Control Diagnostic Control SSC CTL 30-33kHz Down Spread 0.5% 2 1 Control TEST INPUT Commands SSC_CTL (1:0) 00 01 10 11 Operational Modes VCO -- Run Stop Run SSC -- Run Stop Stop FOUT, /FOUT -- 200MHz TEST_I/O 200MHz Reserved (Supplier Internal Test Mode) Default SSC; Modulation Factor = 0.5% Diagnostic Mode; (1MHz TEST INPUT 200MHz) No Spread-Spectrum Table 1. SY89529L Control/Operational Modes M9999-110405 hbwhelp@micrel.com or (408) 955-1690 3 TEST Micrel, Inc. Precision Edge(R) SY89529L PIN DESCRIPTIONS Input/Output Pins Pin Number SOIC 25,26 Pin Number TQFP 8, 9 Pin Name XTAL1, XTAL2 I/O Analog Inputs LVTTL Inputs Pin Function These pins form an oscillator when connected to an external crystal. Either series or parallel-resonant crystals are acceptable. Connect directly to the device. LVTTL-compatible spread-spectrum control pins. Data on control pins maintain device control. For spread-spectrum operation, leave SSC_0 and SSC_1 pins floating (default is spread ON). To reconfigure the device, simply change the SSC and the device will respond dynamically. SSC_0 = 24k pullup. SSC_1 = 24k pulldown Differential, LVPECL clock outputs. These outputs must be terminated to VCC -2V. (see Figure 6) Used for the R//C PLL loop filter. (see Figure 2.) Provides the reference voltage for the PLL. (see Figure 2). Pin is used for test and debug purposes. Is intended to be left floating in production environment. Programmed as input in PLL-bypass mode. Pin includes an internal 24k pullup resistor. 10, 11 23, 24 SSC Control (0:1) 16, 17 23 24 13 30, 31 6 7 27 FOUT, /FOUT LOOP_FILTER LOOP_REF TEST INPUT Differential Analog I/O Analog I/O LVTTL Inputs Power Supply Pins Pin Number SOIC 14, 27 Pin Number TQFP 10, 28 Pin Name VCC1, VCC_TTL I/O Logic Power Pin Function 3.3V LVTTL core logic power-supply pins. Connect each pin directly to the logic-supply plane and use proper bypassing at each pin as close to the pin as possible; Ferrite bead in parallel with 1F//0.01F capacitors. (see Figure 5 for typical bypass circuit.) 3.3V PLL core supply pin. Must be a noise free supply. Bypass as close to the pin as possible; ferrite bead in parallel with 1F//0.01F capacitors. (see Figure 5 for typical bypass circuit.) This is the positive power supply reference for the LVPECL outputs (FOUT and /FOUT). See Figure 5 for typical bypass circuit. This is the ground pin for for the TTL control logic. Normally connected to the logic ground. This is the ground pin for the PLL Core. Normally connected to a quiet, noise-free ground plane for low jitter perfomance. Ground for differential outputs. Normally connected to the logic ground plane. 22 5 ANALOG_ VCC Power PLL 18 32 VCC_OUT Output Power Logic Analog GND Output GND 12 21 15 26 4 29 GND_TTL GND_ANALOG GND_OUTPUT No Connect Pins Pin Number SOIC 1, 2, 3, 4, 5 6, 7, 8, 9, 19 20, 28 Pin Number TQFP 1, 2, 3, 11, 12, 13 14, 15, 16, 17, 18 19, 20, 21, 22, 25 Pin Name NC I/O No Connect Pin Function Pins are high-impedance, low leakage and are not used by internal circuits of the device. These pins are intended to be left floating in production. M9999-110405 hbwhelp@micrel.com or (408) 955-1690 4 Micrel, Inc. Precision Edge(R) SY89529L FUNCTIONAL DESCRIPTION AND TEST MODES Introduction The SY89529L supports three operational modes, as shown in Table 1, page 2. The three modes are spread-spectrum clocking (SSC), non-spread-spectrum clock, and a test mode dynamically controlled with the SSC_Control pins. Unlike other synthesizers, the SY89529L can change spreadspectrum operation on the fly. In SSC mode, the output clock is modulated (30KHz, triangle waveform) in order to achieve a reduction in EMI. In the PLL-bypass test mode, the PLL is disconnected as the source to the differential output, thus allowing an external source to be connected to the TEST INPUT pin. This is useful for in-circuit testing by enabling the differential output to be driven at a lower frequency. Crystal Input and Oscillator Interface The SY89529L features a fully integrated on-board oscillator to minimize system implementation costs. The oscillator is a series resonant, multivibrator type design, and thus, a seriesresonant crystal is preferred, but not required. A parallel-resonant crystal can be used with the SY89529L with only a minor error in the desired frequency. A parallelresonant mode crystal used in a series resonant circuit will exhibit a frequency of oscillation a few hundred ppm lower than specified, a few hundred ppm translates to KHz inaccuracies. In a general computer application this level of inaccuracy is immaterial. As the oscillator is somewhat sensitive to loading on its inputs, the user is advised to mount the crystal as close to the SY89529L as possible to avoid any board level parasitics. In addition, trace lengths should be matched. Figure 1 shows how to interface with a crystal. Table 2 illustrates the crystal specifications. If a start-up problem occurs, consider adding a 10pf capacitor across XTAL1 and XTAL2. SY89529L XTAL2 (Pin 26, SOIC) XTAL1 (Pin 25, SOIC) XTAL 16.666MHz Optional Quartz Crystal Selection: (1) Raltron Series Resonant: AS-16.666-S-SMD-T-MI (2) Raltron Parallel Resonant: AS-16.666-18-SMD-T-MI Figure 1. Crystal Interface Loop Filter Design The filter for any Phase Locked Loop (PLL) based device deserves special attention. SY89529L provides filter pins for an external filter. A simple three-component passive filter is required for achieving ultra low jitter. Figure 2 shows the recommended three-components. Due to the differential design, the filter is connected between LOOP_FILTER and LOOP_REF pins. With this configuration, extremely high supply noise rejection is achieved. It is important that the filter circuit and filter pins be isolated from any non-common mode coupling plane. 560 0.47F 1000pF Loop Filter Loop Reference Figure 2. External Loop Filter Connection Output Frequency: 16.666MHz Mode of Oscillation: Fundamental Min. Frequency Tolerance @25C Frequency Stability over 0C to 70C Operating Temperature Range Storage Temperature Range Aging (per yr/1st 3yrs) Load Capacitance Equivalent Series Resistance (ESR) Drive Level -- -- -20 -55 -- -- -- -- Typ. 30 50 -- -- -- 18 (or series) -- 100 Max. 50 100 +70 +125 5 -- 50 -- Unit ppm ppm C C ppm pF W Table 2. Quartz Crystal Oscillator Specifications M9999-110405 hbwhelp@micrel.com or (408) 955-1690 5 Micrel, Inc. Precision Edge(R) SY89529L Spread Spectrum Spread-spectrum clocking is a frequency modulation technique for EMI reduction. When spread-spectrum is enabled, a 30kHz triangle waveform is used with 0.5% downspread (+0.0%/-0.5%) from the nominal 200MHz clock frequency. An example of a triangle frequency modulation profile is shown in the figure 3 below. The ramp profile can be expressed as: * Fnom = Nominal Clock Frequency in Spread OFF mode (200MHz with 16.66MHz IN) * Fm = Nominal Modulation Frequency (30kHz) * = Modulation Factor (0.5% down spread) 1 , 2 fm 1 1 200MHz Clock Output in Frequency Domain (1 - ) fnom + 2 fm x x fnom x t when 0 < t < (A) Spread-Spectrum OFF (B) Spread-Spectrum ON R = 560 C1 = 1000pF C2 = 0.47F fnom VCC = 3.3V TA = 25C (1-) fnom t 0.5/fm 1/fm TIME (400s/div.) Figure 3. Triangle Frequency Modulation Figure 5. 200MHz Clock Output in Frequency Domain Figure 4. 0.38% Modulation, 32.7KHz Modulation Frequency M9999-110405 hbwhelp@micrel.com or (408) 955-1690 6 Micrel, Inc. Precision Edge(R) SY89529L Power Supply Filtering Techniques As in any high speed integrated circuits, power supply filtering is very important. VCC1, VCC_Analog, VCC_TTL and VCC_OUT 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, better power-supply isolation is required. In this case a ferrite bead along with a 1F and a 0.01F bypass capacitor should be connected to each power supply pin. Figure 6 illustrates power-supply filtering using ferrite beads and bypass capacitors. "Power Supply" side Ferrite Bead* "Device" side VCC Pins 22F 1F 0.01F Termination for PECL Outputs The differential PECL outputs, FOUT and /FOUT, are lowimpedance emitter-follower outputs. Therefore, terminating resistors (DC current path to ground) or current sources must be used for functionality. These outputs are designed to drive 50 transmission lines. Matched impedance techniques should be used to maximize operating frequency and minimize signal distortion. There are a few simple termination schemes. Figure 7 shows a common 3-resistor termination scheme. For more termination examples, see Micrel's Application Note 9 online at www.micrel.com. Low impedance, emitter-follower outputs SY89529L FOUT /FOUT z = 50 z = 50 50 50 50 *For VCC_Analog,VCC_TTL, VCC1, use ferrite bead = 200mA, 0.45 DC, Murata P/N BLM21A1025 *For VCC_OUT use ferrite bead = 3A, 0.025 DC, Murata, P/N BLM31P005 *Componet sizs: 0805 Figure 5. Power Supply Filtering 3-resistor network available* *3-resistor network = Thin-film Technologies, P/N TFT-RN1632-AN1DNC Figure7. LVPECL Output Termination M9999-110405 hbwhelp@micrel.com or (408) 955-1690 7 Micrel, Inc. Precision Edge(R) SY89529L ABSOLUTE MAXIMUM RATINGS(1) Symbol VCC VIN IOUT TLEAD Tstore TA NOTE: 1. Permanent device damage may occur if absolute maximum ratings are exceeded. This is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to absolute maximum ratlng conditions for extended periods may affect device reliability. Parameter Power Supply Voltage Input Voltage Output Source -Continuous -Surge Value -0.5 to +7.0 -0.5 to +7.0 50 100 260 -65 to +150 -0 to +75 Unit V V mA C C C Lead Temperature (soldering, 20sec.) Storage Temperature Operating Temperature LVPECL DC ELECTRICAL CHARACTERISTICS VCC1 = VCC_Analog = VCC_TTL = VCC_OUT = +3.3V 10%; TA = 0C to +85C Symbol VOH VOL VCMR Parameter Output HIGH Voltage Output LOW Voltage Common Mode Range Min. VCC_OUT -1.075 VCC_OUT -1.860 600 Typ. -- -- 700 Max. VCC_OUT -0.830 VCC_OUT -1.570 800 Unit V V mV Condition 50 to VCC_OUT -2V 50 to VCC_OUT -2V LVTTL DC ELECTRICAL CHARACTERISTICS VCC1 = VCC_Analog = VCC_TTL = VCC_OUT = +3.3V 10%; TA = 0C to +85C Symbol Parameter Power Supply Voltage (VCC_Analog, VCC1, VCC_OUT, VCC_TTL) VIH VIL VIK IIH IIL ICC Input HIGH Voltage Input LOW Voltage Input Clamp Voltage Input HIGH Current Input LOW Current Total Supply Current Typcial % of ICC SSC TEST INPUT SSC TEST INPUT VCC1 VCC_OUT VCC_Analog VCC_TTL SSC TEST INPUT SSC TEST INPUT Min. 3.135 2.0 VCC/2 +0.3 -0.3 -- -- -- -- -- -- -- -- -- -- -- Typ. 3.3 -- -- -- -- -- -- -- -- -- 110 14% 5% 5% 76% Max. 3.465 VCC +0.3 -- 0.80 VCC/2 -0.3 -1.2 50 50 0.60 0.60 145 -- -- -- -- Unit V V V V V V A A mA mA mA Note 1 Note 1 IIN = -12mA Note 2 Note 2 No output load Condition NOTES: 1. For TEST INPUT, input threshold is VCC/2. 2. Posituve and negative-going input threshold is set internally to track VCC/2. M9999-110405 hbwhelp@micrel.com or (408) 955-1690 8 Micrel, Inc. Precision Edge(R) SY89529L AC ELECTRICAL CHARACTERISTICS VCC1 = VCC_Analog = VCC_TTL = VCC_OUT = +3.3V 10%; TA = 0C to +85C Symbol FM FMF SRED'N FXTAL tDC tJIT tPERIOD tSTABLE tr tf Parameter SSC Modulation Frequency SSC Modulation Factor Spectral Reduction Crystal Input Range Output Duty Cycle(1) Peak-to-Peak, Cycle-to-Cycle Jitter(1) Output Period(1) Power-Up to Stable Clock Output Output Rise/Fall Times (20% to 80%) Min. 30 -- 7 14 48 -- 4995 -- 300 Typ. -- 0.5 9 16.66 -- 20 -- -- -- Max. 33.33 0.6 -- 18 52 30 5005 10 800 Unit KHz % dB MHz % ps ps ms ps FOUT, /FOUT FOUT = 200MHz FOUT = 200MHz FOUT = 200MHz FOUT = 200MHz(2) Condition NOTES: 1. Spread-spectrum clocking enabled. 2. SY89529L spectral reduction is the component-specific indication of EMI reduction. The SY89529L`s spectral peak reduction is not necessarily the same as the system EMI reduction. M9999-110405 hbwhelp@micrel.com or (408) 955-1690 9 Micrel, Inc. Precision Edge(R) SY89529L 28-PIN SOIC .300" WIDE (Z28-1) M9999-110405 hbwhelp@micrel.com or (408) 955-1690 10 Micrel, Inc. Precision Edge(R) SY89529L 32-PIN TQFP (T32-1) Rev. 01 MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 TEL USA + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2005 Micrel, Incorporated. M9999-110405 hbwhelp@micrel.com or (408) 955-1690 11 |
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