SM802109

SM802109 ClockWorks™ PCI-e Quad 100MHz Ultra-Low Jitter, HCSL Frequency Synthesizer General Description The SM802109 is a member of the ClockWorks™ family of devices from Micrel and provides an extremely low-noise timing solution for PCI-Express clock signals. It is based on a unique patented RotaryWave® architecture that provides very-low phase noise. The device operates from a 3.3V or 2.5V power supply and synthesizes four HCSL output clocks at 100MHz. The SM802109 accepts a 25MHz crystal or LVCMOS reference clock. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. Features • Generates four HCSL clock outputs at 100MHz • 2.5V or 3.3V operating range • Typical phase jitter @ 100MHz (1.875MHz to 20MHz): 105fs • Industrial temperature range (–40°C to +85°C) • Green, RoHS, and PFOS compliant • Available in 24-pin 4mm × 4mm QFN package Applications • PCI-Express Block Diagram ClockWorks is a trademark of Micrel, Inc RotaryWave is a registered trademark of Multigig, 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 September 2011 M9999-092911-B hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SM802109 Ordering Information(1) Part Number SM802109UMG SM802109UMGTR Note: 1. Devices are Green, RoHS, and PFOS compliant. Marking 802109 802109 Shipping Tube Tape and Reel Temperature Range –40°C to +85°C –40°C to +85°C Package 24-Pin QFN 24-Pin QFN Pin Configuration 24-Pin QFN (Top View) Pin Description Pin Number 16, 17 20, 21 23, 24 3, 4 1 2 Pin Name /Q0, Q0 /Q1, Q1 /Q2, Q2 /Q3, Q3 VDDO2 VSSO2 Pin Type O, (DIF) O, (DIF) PWR PWR Pin Level HCSL HCSL Pin Function Differential Clock Outputs from Bank 1 100MHz Differential Clock Outputs from Bank 2 100MHz Power Supply for Output Bank 2 Power Supply Ground for Output Bank 2 PLL Bypass, Selects Output Source 5 PLL_BYPASS I, (SE) LVCMOS 0 = Normal PLL Operation 1 = Output from Input Reference Clock or Crystal 45KΩ pulldown 6 XTAL_SEL I, (SE) LVCMOS Selects PLL Input Reference Source 0 = REF_IN, 1 = XTAL, 45KΩ pullup September 2011 2 M9999-092911-B hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SM802109 Pin Description (Continued) Pin Number 7, 12, 15, 19 8 13, 14 18 22 9 10 11 Pin Name TEST VDD VSS (Exposed Pad) VDDO1 VSSO1 REF_IN XTAL_IN XTAL_OUT PWR PWR PWR PWR I, (SE) I, (SE) O, (SE) LVCMOS Crystal Crystal Pin Type Pin Level Pin Function Factory Test pins, Do not connect anything to these pins. Core Power Supply Core Power Supply Ground. The exposed pad must be connected to the VSS ground plane. Power Supply for Output Bank 1 Power Supply Ground for Output Bank 1 Reference Clock Input Crystal Reference Input, no load caps needed (see Figure 5). Crystal Reference Output, no load caps needed (see Figure 5). Truth Table PLL_BYPASS 0 1 − − XTAL_SEL − − 0 1 INPUT − − REF_IN XTAL OUTPUT PLL XTAL/REF_IN − − September 2011 3 M9999-092911-B hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SM802109 Absolute Maximum Ratings(1) 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 Operating Ratings(2) Supply Voltage (VDD, VDDO1/2)............... +2.375V to +3.465V Ambient Temperature (TA).......................... –40°C to +85°C Junction Thermal Resistance(3) QFN (θJA) Still-Air......................................................... 50°C/W QFN (ψJB) Junction-to-Board ....................................... 30°C/W DC Electrical Characteristics(4) 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 VDD, VDDO1/2 VDD, VDDO1/2 IDD REF_IN IDD XTAL Parameter 2.5V Operating Voltage 3.3V Operating Voltage Supply current VDD + VDDO XTAL_SEL = 0 Outputs 50Ω to VSS XTAL_SEL = 1 Outputs 50Ω to VSS Condition Min. 2.375 3.135 Typ. 2.5 3.3 140 Max. 2.625 3.465 175 Units V V mA Supply current VDD + VDDO 150 185 mA HCSL DC Electrical Characteristics(4) 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 Min 660 -150 250 Typ. 700 0 350 Max. 850 27 550 Units mV mV mV VOH VOL VCROSS Notes: 1. Output High Voltage Output Low Voltage Crossing Point Voltage 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. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings. Package thermal resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the PCB. The circuit is designed to meet the AC and DC specifications shown in the above table(s) after thermal equilibrium has been established. 2. 3. 4. September 2011 4 M9999-092911-B hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SM802109 LVCMOS (PLL_BYPASS, XTAL_SEL) DC Electrical Characteristics(4) VDD = 3.3V ±5%, or 2.5V ±5%, TA = −40°C to +85°C. Symbol VIH VIL IIH IIL Parameter Input High Voltage Input Low Voltage Input High Current Input Low Current VDD = VIN = 3.465V VDD = 3.465V, VIN = 0V −150 Condition Min. 2 −0.3 Typ. Max. VDD + 0.3 0.8 150 Units V V μA μA REF_IN DC Electrical Characteristics(4) VDD = 3.3V ±5%, or 2.5V ±5%, TA = −40°C to +85°C. Symbol VIH VIL I IN Parameter Input High Voltage Input Low Voltage Input Current XTAL_SEL = VIL, VIN = 0V to VDD XTAL_SEL = VIH, VIN = VDD Condition Min. 1.1 −0.3 −5 20 Typ. Max. VDD + 0.3 0.6 5 Units V V μA µA Crystal Characteristics Parameter Mode of Oscillation Frequency Equivalent Series Resistance (ESR) Shunt Capacitor, C0 Correlation Drive Level Condition 10pF to 12pF Load Min. Typ. 25 1 10 50 5 100 Max. Units MHz Ω pF Fundamental, Parallel Resonant µW September 2011 5 M9999-092911-B hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SM802109 AC Electrical Characteristics(4, 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 FOUT FREF TR/TF ODC TSKEW TLOCK Parameter Output Frequency Reference Input Frequency LVPECL Output Rise/Fall Time Output Duty Cycle Output-to-Output Skew PLL Lock Time 100MHz Integration Range (1.875MHz – 20MHz) Integration Range (12kHz – 20MHz) 25MHz Note 6 20% – 80% 150 48 Condition Min. Typ. 100 25 300 50 450 52 45 20 Max. Units MHz MHz ps % ps ms Tjit(∅) RMS Phase Jitter (7) 105 250 −95 fs Spurious Noise Components Notes: 5. 6. 7. dBc All phase noise measurements were taken with an Agilent 5052B phase noise system. Defined as skew between outputs at the same supply voltage and with equal load conditions; measured at the output differential crossing points. 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. September 2011 6 M9999-092911-B hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SM802109 Application Information Input Reference When operating with a crystal input reference, do not apply a switching signal to REF_IN. 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 further details. Contact Micrel’s HBW applications group if you need assistance on selecting a suitable crystal for your application at: hbwhelp@micrel.com. 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: hbwhelp@micrel.com. September 2011 7 M9999-092911-B hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SM802109 Phase Noise Plots Phase Noise Plot: 100MHz, 1.875MHz − 20MHz 104fS Phase Noise Plot: 100MHz, 12kHz − 20MHz 242fS September 2011 8 M9999-092911-B hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SM802109 Figure 1. Duty Cycle Timing Figure 2. All Outputs Rise/Fall Time Figure 3. RMS Phase/Noise Jitter September 2011 9 M9999-092911-B hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SM802109 Figure 4. HCSL Output Load and Test Circuit Figure 5. Crystal Input Interface September 2011 10 M9999-092911-B hbwhelp@micrel.com or (408) 955-1690 Micrel, Inc. SM802109 Package Information 24-Pin Package Type 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. © 2011 Micrel, Incorporated. September 2011 11 M9999-092911-B hbwhelp@micrel.com or (408) 955-1690