PL602041UMG

PL602041 ClockWorks™ PCIe Quad Outputs Ultra-Low Jitter, HCSL Frequency Synthesizer General Description Features The PL602041 is a member of the ClockWorks family of devices from Micrel and provides an extremely low-noise timing solution for PCI Express clock signals.  Input crystal frequency of 25MHz  Generates four HCSL clock outputs at 25MHz, 100MHz, 125MHz, and 200MHz  2.5V or 3.3V operating range  Typical phase jitter @ 100MHz (1.875MHz to 20MHz): 105fs  Compliant with PCI Express Gen1, Gen2, and Gen3  Industrial temperature range (–40C to +85C)  RoHS and PFOS compliant  Available in 24-pin 4mm x 4mm QFN package The device operates from a 3.3V or 2.5V power supply and synthesizes four HCSL output clocks at 25MHz, 100MHz, 125MHz, and 200MHz. The PL602041 accepts a 25MHz crystal. Datasheets and support documentation are available on Micrel’s web site at: www.micrel.com. Applications      Servers Storage systems Switches and routers Gigabit Ethernet Set-top boxes/DVRs _________________________________________________________________________________________________________________________ Block Diagram ClockWorks and Ripple Blocker are trademarks of Micrel, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com January 28, 2014 Revision 1.3 tcghelp@micrel.com or (408) 955-1690 Micrel, Inc. PL602041 Ordering Information(1) Part Number Marking Shipping Junction Temperature Range Package Lead Finish PL602041UMG PL602 041 Tube –40°C to +85°C 24-Pin QFN NiPdAu PL602041UMG TR PL602 041 Tape and Reel –40°C to +85°C 24-Pin QFN NiPdAu Note: 1. Devices are RoHS and PFOS compliant. Pin Configuration 24-Pin QFN (Top View) Pin Description Pin Number Pin Name Pin Type Pin Level 17, 18 19, 20 /Q0, Q0 /Q1, Q1 O, (DIF) HCSL Differential Clock Outputs Pairs. 23, 24 1, 2 /Q2, Q2 /Q3, Q3 O, (DIF) HCSL Differential Clock Outputs Pairs. 9 VDDO2 PWR Power Supply. 16, 21 VDDO1 PWR Power Supply. 3, 7 VDD PWR Core Power Supply. 4, 5, 13, 22 VSS PWR Power Supply Ground. 6, 8 S0, S1 I LVCMOS 10 XIN I, (SE) Crystal Crystal Input, no load caps needed (see Figure 5). 11 XOUT O, (SE) Crystal Crystal Output, no load caps needed (see Figure 5). 12 OE I, (SE) LVCMOS 14, 15 NC January 28, 2014 Pin Function Frequency Select for 25MHz, 100MHZ, 125MHZ, and 200MHz. Each pin has a 45K pull-up. Output Enable/Disable. No Connect. 2 Revision 1.3 tcghelp@micrel.com or (408) 955-1690 Micrel, Inc. PL602041 Absolute Maximum Ratings(2) Operating Ratings(3) Supply Voltage (VDD, VDDO1/2) ...................................... +4.6V Input Voltage (VIN) .............................. 0.50V to VDD + 0.5V Lead Temperature (soldering, 20s) ............................ 260°C Case Temperature ..................................................... 115°C Storage Temperature (TS) ......................... 65C to 150°C Supply Voltage (VDD, VDDO1/2) ............... +2.375V to +3.465V Ambient Temperature (TA) .......................... –40°C to +85°C (4) Junction Thermal Resistance QFN (JA) Still Air ............................................... 50°C/W QFN (JB) Junction-to-Board ............................. 30°C/W DC Electrical Characteristics(5) VDD = VDDO1/2 = 3.3V 5% or 2.5V 5% VDD = 3.3V 5%, VDDO1/2 = 3.3V 5% or 2.5V 5% TA = 40C to 85C. Symbol Parameter VDD, VDDO1/2 2.5V Operating Voltage VDD, VDDO1/2 2.5V Operating Voltage IDD Supply Current to VDD + VDDO Condition Min. Typ. Max. Units 2.375 2.5 2.625 V 3.135 3.3 3.465 V 150 185 mA Min. Typ. Max. Units Outputs 50Ω to VSS HCSL DC Electrical Characteristics(5) VDD = VDDO1/2 = 3.3V 5% or 2.5V 5% VDD = 3.3V 5%, VDDO1/2 = 3.3V 5% or 2.5V 5% TA = 40C to 85C. RL = 50Ω to VSS Symbol Parameter Condition VOH Output High Voltage 660 700 850 mV VOL Output Low Voltage 150 0 27 mV VCROSS Crossing Point Voltage 250 350 550 mV LVCMOS (S0, S1) DC Electrical Characteristics(6) VDD = 3.3V 5%, or 2.5V 5%, TA = 40C to 85C. Symbol Parameter Condition Min. VIH Input High Voltage VIL Input Low Voltage IIH Input High Current VDD = VIN = 3.465V IIL Input Low Current VDD = 3.465V, VIN = 0V Typ. Max. Units 2 VDD + 0.3 V 0.3 0.8 V 150 A 150 A Notes: 2. 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 rating conditions for extended periods may affect device reliability. 3. The datasheet limits are not guaranteed if the device is operated beyond operating ratings. 4. Package thermal resistance assumes exposed pad is soldered (or equivalent) to the device’s most negative potential on the PCB. 5. The circuit is designed to meet the AC and DC specifications shown in the above table(s) after thermal equilibrium has been established. 6. All phase noise measurements were taken with an Agilent 5052B phase noise system. January 28, 2014 3 Revision 1.3 tcghelp@micrel.com or (408) 955-1690 Micrel, Inc. PL602041 Crystal Characteristics Parameter Condition Mode of Oscillation 10pF load capacitance Min. Typ. Max. Units Fundamental, Parallel Resonant Frequency 25 MHz Equivalent Series Resistance (ESR) 50 Ω Shunt Capacitor, C0 1 5 pF Correlation Drive Level 10 100 W AC Electrical Characteristics(6, 7) VDD = VDDO1/2 = 3.3V 5% or 2.5V 5% VDD = 3.3V 5%, VDDO1/2 = 3.3V 5% or 2.5V 5% TA = 40C to 85C. RL = 50Ω to VSS Symbol Parameter Condition FOUT Output Frequency FREF Crystal Input Frequency TR/TF HCSL Output Rise/Fall Time ODC Output Duty Cycle TSKEW Output-to-Output Skew TLOCK PLL Lock Time TJIT() RMS Phase Jitter (8) Min. 20% – 80% Typ. Units 25, 100, 125, 200 MHz 25 MHz 150 300 450 48 50 52 % 45 ps 20 ms Note 7 100MHz Integration Range (1.875MHz–20MHz) Integration Range (12kHz–20MHz) Max. 105 250 ps fs Notes: 7. Defined as skew between outputs at the same supply voltage and with equal load conditions; measured at the output differential crossing points. 8. Measured using 25MHz crystal as the input reference source. If using an external reference input, use a low phase noise source. With an external reference, the phase noise will follow the input source phase noise up to about 1MHz. Truth Tables S1 S0 OUTPUT 0 0 25MHz 0 1 100MHz 1 0 125MHz 1 1 200MHz January 28, 2014 4 Revision 1.3 tcghelp@micrel.com or (408) 955-1690 Micrel, Inc. PL602041 Phase Noise Plots Phase Noise Plot: 100MHz, 1.875MHz20MHz 104fs Phase Noise Plot: 100MHz, 12kHz20MHz 242fs January 28, 2014 5 Revision 1.3 tcghelp@micrel.com or (408) 955-1690 Micrel, Inc. PL602041 Figure 1. Duty Cycle Timing Figure 2. All Outputs Rise/Fall Time Figure 3. RMS Phase/Noise Jitter January 28, 2014 6 Revision 1.3 tcghelp@micrel.com or (408) 955-1690 Micrel, Inc. PL602041 Figure 4. HCSL Output Load and Test Circuit Figure 5. HCSL Recommended Application Termination (Source Terminated) Figure 6. Crystal Input Interface January 28, 2014 7 Revision 1.3 tcghelp@micrel.com or (408) 955-1690 Micrel, Inc. PL602041 Application Information The impedance value of the Ferrite Bead (FB) needs to be between 240Ω and 600Ω with a saturation current ≥150mA. Crystal Layout Keep the layers under the crystal as open as possible and do not place switching signals or noisy supplies under the crystal. Crystal load capacitance is built inside the die, so no external capacitance is needed. See the Selecting a Quartz Crystal for the Clockworks Flex I Family of Precision Synthesizers application note for more details. VDDO1 and VDDO2 pins connect directly to the VDD plane. All VDD pins on the PL602041 connect to VDD after the power supply filter. HCSL Outputs HCSL outputs are to be terminated with 50Ω to VSS. For best performance load all outputs. If you want to ACcouple or change the termination, contact Micrel’s application group: tcghelp@micrel.com (see Figure 5). Contact Micrel’s HBW applications group at: tcghelp@micrel.com if you need help selecting a suitable crystal for your application. Power Supply and Decoupling Place the smallest value decoupling capacitor (4.7nF above) between the VDD and VSS pins, as close as possible to those pins and at the same side of the PCB as the IC. The shorter the physical path from VDD to capacitor and back from capacitor to VSS, the more effective the decoupling. Use one 4.7nF capacitor for each VDD pin on the PL602041. Power Supply Filtering Recommendations Preferred filter, using Micrel MIC94300 or MIC94310 Ripple Blocker™: Alternative, traditional filter, using a ferrite bead: January 28, 2014 8 Revision 1.3 tcghelp@micrel.com or (408) 955-1690 Micrel, Inc. PL602041 Package Information(9) 24-Pin Package Type (QFN) Note: 9. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com. MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. 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 a Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2014 Micrel, Incorporated. January 28, 2014 9 Revision 1.3 tcghelp@micrel.com or (408) 955-1690