SM802116 ClockWorks™ Fibre Channel (106.25MHz, 212.5MHz) Ultra-Low Jitter, LVDS Frequency Synthesizer General Description Features The SM802116 is a member of the ClockWorks™ family of devices from Micrel and provides an extremely low-noise timing solution for Fibre Channel clock signals. It is based upon 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 LVDS output clocks at 106.25MHz or 212.5MHz. There are normally two clock outputs, but one output can be achieved by powering down the second output with the OE pin. The SM802116 accepts a 26.5625MHz crystal or LVCMOS reference clock. Data sheet and support documentation can be found on Micrel’s web site at: www.micrel.com. • Generates one or two LVDS clock outputs at 106.25MHz or 212.5MHz • 2.5V or 3.3V operating range • Typical phase jitter @ 106.25MHz (637kHz to 10MHz): 190fs • Industrial temperature range (–40°C to +85°C) • Green, RoHS, and PFOS compliant • Available in 24-pin 4mm × 4mm QFN package Applications • Fibre Channel • Storage Networking (SAN, NAS) 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 July 2011 M9999-071811-A [email protected] or (408) 955-1690 Micrel, Inc. SM802116 Ordering Information(1) Part Number Marking Shipping Temperature Range Package SM802116UMG 802116 Tube –40°C to +85°C 24-Pin QFN SM802116UMGR 802116 Tape and Reel –40°C to +85°C 24-Pin QFN Note: 1. Devices are Green, RoHS, and PFOS compliant. Pin Configuration 24-Pin QFN (Top View) Pin Description Pin Number Pin Name Pin Type Pin Level Pin Function 19, 20 /Q1, Q1 O, (DIF) LVDS 22, 23 /Q2, Q2 O, (DIF) LVDS 24 VDDO2 PWR Power Supply for Output Bank 2 2 VSSO2 PWR Power Supply Ground for Output Bank 2 Differential Clock Output from Bank 1 106.25MHz or 212.5MHz Differential Clock Output from Bank 2 106.25MHz or 212.5MHz PLL Bypass, Selects Output Source 3 PLL_BYPASS I, (SE) 0 = Normal PLL Operation LVCMOS 1 = Output from Input Reference Clock or Crystal 45KΩ pull-down 4 July 2011 XTAL_SEL I, (SE) Selects PLL Input Reference Source LVCMOS 0 = REF_IN, 1 = XTAL, 45KΩ pull-up 2 M9999-071811-A [email protected] or (408) 955-1690 Micrel, Inc. SM802116 Pin Description (Continued) Pin Number Pin Name 5, 11, 16, 18 TEST 1 VDD Pin Type Pin Level Pin Function Factory Test pins, Do not connect anything to these pins. PWR Core Power Supply 13, 14, 15 VSS PWR Core Power Supply Ground 17 VDDO1 PWR Power Supply for Output Bank 1 21 VSSO1 PWR Power Supply Ground for Output Bank 1 8 REF_IN I, (SE) LVCMOS 9 XTAL_IN I, (SE) 12pF crystal 10 XTAL_OUT O, (SE) 12pF crystal 6 FSEL I, (SE) LVCMOS 7 OE1 I, (SE) LVCMOS 12 OE2 I, (SE) LVCMOS Reference Clock Input Crystal Reference Input, no load caps needed. (see Figure 5) Crystal Reference Output, no load caps needed. (se Figure 5) Frequency Select, 1 = 106.25MHz, 0 = 212.5MHz, 45KΩ pull-up Output Enable, Q1 disables to tri-state, 0 = Disabled, 1 = Enabled, 45KΩ pull-up Output Enable, Q2 disables to tri-state, 0 = Disabled, 1 = Enabled, 45KΩ pull-up Truth Tables PLL_BYPASS XTAL_SEL OE2 OE1 INPUT OUTPUT 0 − 1 1 − PLL 1 − 1 1 − XTAL/REF_IN − 0 1 1 REF_IN − − 1 1 1 XTAL − − − − 0 1 1 0 − − Q2 Tri-state Q1 Tri-state FSEL Output Frequency (MHz) 0 212.5 1 106.25 July 2011 − 3 M9999-071811-A [email protected] or (408) 955-1690 Micrel, Inc. SM802116 Absolute Maximum Ratings(1) Operating Ratings(2) 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 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 Parameter VDD, VDDO1/2 Min. Typ. Max. Units 2.5V Operating Voltage 2.375 2.5 2.625 V VDD, VDDO1/2 3.3V Operating Voltage 3.135 3.3 3.465 V 106.25MHz - 1 output 77 96 IDD REF_IN Supply current VDD + VDDO XTAL_SEL = 0 Outputs open 106.25MHz - 2 outputs 89 110 212.5MHz - 1 output 85 106 212.5MHz - 2 outputs 100 124 106.25MHz - 1 output 87 108 106.25MHz - 2 outputs 99 123 212.5MHz - 1 output 97 120 212.5MHz - 2 outputs 111 137 IDD XTAL Supply current VDD + VDDO XTAL_SEL = 1 Outputs open Condition mA mA LVDS 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 = 100Ω across Q and /Q. Symbol Parameter Condition Min. Typ. Max. Units VOD Differential Output Voltage Figure 1 275 350 475 mV ΔVOD VOD Magnitude Change 40 mV VOS Offset Voltage 1.50 V ΔVOS VOS Magnitude Change 50 mV 1.15 1.25 Notes: 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 rating conditions for extended periods may affect device reliability. 2. The data sheet limits are not guaranteed if the device is operated beyond the operating ratings. 3. Package thermal resistance assumes exposed pad is soldered (or equivalent) to the devices most negative potential on the PCB. 4. The circuit is designed to meet the AC and DC specifications shown in the above table(s) after thermal equilibrium has been established. July 2011 4 M9999-071811-A [email protected] or (408) 955-1690 Micrel, Inc. SM802116 LVCMOS (PLL_BYPASS, XTAL_SEL, OE1/2, FSEL) DC Electrical Characteristics(4) VDD = 3.3V ±5%, or 2.5V ±5%, TA = −40°C to +85°C. Symbol Parameter Condition 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 Min. Typ. Max. Units 2 VDD + 0.3 V −0.3 0.8 V 150 μA −150 μA REF_IN DC Electrical Characteristics(4) VDD = 3.3V ±5%, or 2.5V ±5%, TA = −40°C to +85°C. Symbol Parameter VIH Input High Voltage VIL Input Low Voltage IIN Input Current Condition Min. XTAL_SEL = VIL, VIN = 0V to VDD Max. Units 1.1 VDD + 0.3 V −0.3 0.6 V −5 5 μA XTAL_SEL = VIH, VIN = VDD Typ. 20 µA Crystal Characteristics Parameter Condition Mode of Oscillation Frequency Equivalent Series Resistance (ESR) Shunt Capacitor, C0 Correlation Drive Level 12pF Load July 2011 Min. Typ. Max. Units Fundamental, Parallel Resonant 26.5625 1 10 5 50 5 100 MHz Ω pF uW M9999-071811-A [email protected] or (408) 955-1690 Micrel, Inc. SM802116 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 = 100Ω across Q and /Q. Symbol Parameter Condition Min. Typ. Max. Units FOUT1 Output Frequency 1 FSEL=1 106.25 MHz FOUT2 Output Frequency 2 FSEL=0 212.5 MHz FREF Reference Input Frequency TR/TF LVDS Output Rise/Fall Time ODC Output Duty Cycle TSKEW Output-to-Output Skew TLOCK PLL Lock Time 26.5625 20% – 80% Tjit(∅) RMS Phase Jitter 220 400 48 50 52 % 45 ps 20 ms Note 6 106.25MHz Integration Range (637kHz – 10MHz) Integration Range (12kHz – 20MHz) Spurious Noise Components 26.5625MHz using 106.25MHz 26.5625MHz using 212.5MHz ps 190 250 (7) 212.5MHz Integration Range (637kHz – 10MHz) Integration Range (12kHz – 20MHz) MHz 100 fs 180 240 −90 −85 dBc Notes: 5. All phase noise measurements were taken with an Agilent 5052B phase noise system. 6. Defined as skew between outputs at the same supply voltage and with equal load conditions; Measured at the output differential crossing points. 7. Measured using 26.5625MHz 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. July 2011 6 M9999-071811-A [email protected] or (408) 955-1690 Micrel, Inc. SM802116 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 [email protected]. LVDS Outputs LVDS outputs are to be terminated with 100Ω across Q and /Q. For best performance load all outputs. You can DC or AC-couple the outputs. July 2011 7 M9999-071811-A [email protected] or (408) 955-1690 Micrel, Inc. SM802116 Phase Noise Plots Phase Noise Plot: 106.25MHz, 637kHz − 10MHz 184fS Phase Noise Plot: 106.25MHz, 12kHz − 20MHz 241fS July 2011 8 M9999-071811-A [email protected] or (408) 955-1690 Micrel, Inc. SM802116 Phase Noise Plots (Continued) Phase Noise Plot: 212.5MHz, 637kHz − 10MHz 178fS Phase Noise Plot: 212.5MHz, 12kHz − 20MHz 234fS July 2011 9 M9999-071811-A [email protected] or (408) 955-1690 Micrel, Inc. SM802116 Figure 1. Duty Cycle Timing Figure 2. All Outputs Rise/Fall Time Figure 3. RMS Phase/Noise Jitter July 2011 10 M9999-071811-A [email protected] or (408) 955-1690 Micrel, Inc. SM802116 Figure 4. LVDS Output Load and Test Circuit Figure 5. Crystal Input Interface July 2011 11 M9999-071811-A [email protected] or (408) 955-1690 Micrel, Inc. SM802116 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. July 2011 12 M9999-071811-A [email protected] or (408) 955-1690