SM843001-106 ClockWorks™ Fibre Channel, 106.25MHz, Ultra-Low Jitter LVPECL Clock Frequency Synthesizer General Description Features The SM843001-106 is a Fibre Channel, 106.25MHz LVPECL clock frequency synthesizer and a member of the ClockWorks™ family of devices from Micrel. It provides a low-noise timing solution for high-speed, high-accuracy synthesis of clock signals. It includes a patented RotaryWave® architecture that provides a stable clock with very low phase noise. Power supplies of either 2.5V or 3.3V are supported, with superior jitter and phase noise performance. The device synthesizes a 106.25MHz, low-noise, LVPECL output for Fibre Channel applications. The crystal reference frequency used is 26.5625MHz. The SM843001-106 is an excellent replacement for IDT FemtoClocks®, with improved waveform integrity, and jitter. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. • Generates a low jitter LVPECL output • 2.5V or 3.3V operating voltage • Typical phase jitter ~170 fs (637kHz to 10MHz) @106.25MHz • Crystal frequency: 26.5625MHz • 106.25MHz output frequency • RMS Phase Noise @ 106.25MHz: – 1kHz: −127dBc/Hz – 10kHz: −134dBc/Hz – 100kHz: −142dBc/Hz – 1MHz: −144dBc/Hz – 10MHz: −165dBc/Hz – 20MHz: −168dBc/Hz • Industrial temperature range • Green-, RoHS-, and PFOS-compliant • Available in 8-pin TSSOP Applications • Fibre Channel • Storage Networking (SAN) ___________________________________________________________________________________________________________ Block Diagram ClockWorks is a trademark of Micrel, Inc. RotaryWave is a registered trademark of Multigig, Inc. FemtoClocks is a registered trademark of IDT, 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 October 2010 M9999-100610-A [email protected] or (408) 955-1690 Micrel, Inc. SM843001-106 Ordering Information(1) Part Number Package Type Operating Range Package Marking K-8 Industrial 843001-106 K-8 Industrial 843001-106 SM843001-106KA (2) SM843001-106KA TR Notes: 1. Devices are Green-, RoHS-, and PFOS-compliant. 2. Tape and Reel. Pin Configuration 8-Pin TSSOP (K-8) Pin Description Pin Number Pin Name Type 1 VDDA PWR Analog 2.5V or 3.3V Power Supply. No filter resistor needed. 2 VEE PWR Ground. 3 XTAL_OUT O, (SE) 12pF crystal Crystal Reference Output, no load caps needed. 4 XTAL_IN I, (SE) 12pF crystal Crystal Reference Input, no load caps needed. 5 NC − 6 /Q0 O, (DIF) LVPECL Differential Clock Output. 7 Q0 O, (DIF) LVPECL Differential Clock Output. 8 VDD PWR October 2010 Level Pin Function No Connect. 2.5V or 3.3V Power Supply. 2 M9999-100610-A [email protected] or (408) 955-1690 Micrel, Inc. SM843001-106 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VDDA, VDD,) ........................................+4.6V Input Voltage (VIN) ................................ −0.50V to VDD+0.5V LVPECL Output Current (IOUT) Continuous............................................................50mA Surge ..................................................................100mA Lead Temperature (soldering, 20s)............................ 260°C Case Temperature ..................................................... 115°C Storage Temperature (Ts) .........................−65°C to +150°C Supply Voltage (VIN)............................. +2.375V to +3.465V Ambient Temperature (TA) .......................... –40°C to +85°C Junction Thermal Resistance TSSOP (θJA)(Still Air).......................................141°C/W DC Electrical Characteristics(3) VDD = VDDA = 3.3V ±5%; TA = –40°C to +85°C, unless noted. Symbol Parameter Condition Min. Typ. Max. Units V VDD Core Supply Voltage 3.135 3.30 3.465 VDDA Analog Supply Voltage 3.135 3.30 3.465 V IDDA Analog Supply Current 48 60 mA IEE Total supply current 85 105 mA Min. Typ. Max. Units V No load VDD = VDDA = 2.5V ±5%; TA = –40°C to +85°C, unless noted. Symbol Parameter Condition VDD Core Supply Voltage 2.375 2.50 2.625 VDDA Analog Supply Voltage 2.375 2.50 2.625 V IDDA Analog Supply Current 48 60 mA IEE Total supply current 79 98 mA No load LVPECL DC Electrical Characteristics(3)(4) VDD = VDDA = 2.5V ±5% or 3.3V ±5%, TA = –40°C to +85°C, unless noted. Symbol Parameter Condition Min. Typ. Max. Units VOH Output High Voltage 50Ω to VDD − 2V VDD – 1.145 VDD – 0.97 VDD – 0.845 V VOL Output Low Voltage 50Ω to VDD − 2V VDD – 1.945 VDD – 1.77 VDD – 1.645 V VSWING Peak-to-Peak Output Voltage Swing 0.6 0.8 1.0 V 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. The circuit is designed to meet the DC specifications shown in the above tables after thermal equilibrium has been established with a transverse airflow greater than 500 lfpm. 4. See Figure 4 for load test circuit example. October 2010 3 M9999-100610-A [email protected] or (408) 955-1690 Micrel, Inc. SM843001-106 AC Electrical Characteristics(5) VDD = VDDA = 2.5V ±5% or 3.3V ±5%, TA = –40°C to +85°C, unless noted. Symbol Parameter Condition Min. FOUT Output Frequency 26.5625MHz Crystal tJITTER RMS Phase Jitter (Output =106.25MHz) Integration Range: 637kHz to 10MHz t R / tF Output rise/fall time 20% to 80% ODC Output Duty Cycle Typ. Max. 106.25 Units MHz 170 fs 80 150 350 ps 48 50 52 % Note: 5. The circuit is designed to meet the AC specifications shown in the above table(s) after thermal equilibrium has been established with a transverse airflow greater than 500 lfpm. Crystal Characteristics Parameter Condition Mode of Oscillation Frequency Equivalent Series Resistance (ESR) Shunt Capacitor, C0 Correlation Drive Level 12pF Load October 2010 Min. Typ. Max. Fundamental, Parallel Resonant 26.5625 50 3 7 100 300 4 Units MHz Ω pF uW M9999-100610-A [email protected] or (408) 955-1690 Micrel, Inc. SM843001-106 Figure 1. Duty Cycle Timing Figure 2. All Outputs Rise/Fall Time Figure 3. RMS Phase Noise/Jitter October 2010 5 M9999-100610-A [email protected] or (408) 955-1690 Micrel, Inc. SM843001-106 Figure 4. LVPECL Output Load and Test Circuit Figure 5. Crystal Input Interface October 2010 6 M9999-100610-A [email protected] or (408) 955-1690 Micrel, Inc. SM843001-106 Package Information 8-Pin TSSOP (K-8) 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. © 2010 Micrel, Incorporated. October 2010 7 M9999-100610-A [email protected] or (408) 955-1690