SM843001-212 ClockWorksTM Fibre Channel, 212.5MHz, Ultra-Low Jitter LVPECL Clock Frequency Synthesizer General Description Features The SM843001-212 is a Fibre Channel, 212.5MHz • Generates a low jitter LVPECL output LVPECL clock frequency synthesizer and a member of the • 2.5V or 3.3V operating voltage ClockWorks™ family of devices from Micrel. It provides a • Typical phase jitter ~170fs low-noise timing solution for high-speed, high-accuracy (637kHz to 10MHz) @212.5MHz synthesis of clock signals. It includes a patented RotaryWave® architecture that provides a stable clock with • Crystal frequency: 26.5625MHz very low phase noise. • 212.5MHz output frequency Power supplies of either 2.5V or 3.3V are supported, with • RMS Phase Noise @ 212.5MHz: superior jitter and phase noise performance. The device – 1kHz: −119dBc/Hz synthesizes a 212.5MHz, low-noise, LVPECL output for – 10kHz: −127dBc/Hz Fibre Channel applications. The crystal reference – 100kHz: −135dBc/Hz frequency used is 26.5625MHz. – 1MHz: −138dBc/Hz The SM843001-212 is an excellent replacement for IDT – 10MHz: −160dBc/Hz FemtoClocks®, with improved waveform integrity, and – 20MHz: −165dBc/Hz jitter. • Industrial temperature range Data sheets and support documentation can be found on • Green, RoHS-, and PFOS-compliant Micrel’s web site at: www.micrel.com. • 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 M9999-100410-A hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc. SM843001-212 Ordering Information(1) Part Number Package Type Operating Range Package Marking SM843001-212KA K-8 Industrial 843001-212 SM843001-212KA TR(2) K-8 Industrial 843001-212 Notes: 1. Devices are Green, RoHS-compliant and PFOS-compliant. 2. Tape and Reel. Pin Configuration 8-Pin TSSOP (K-8) Pin Description Pin Number Pin Name Type Level Pin Function 1 V PWR Analog 2.5V or 3.3V Power Supply. No filter resistor needed. DDA 2 V PWR Ground. EE 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 - No Connect 6 /Q0 O, (DIF) LVPECL Differential Clock Output 7 Q0 O, (DIF) LVPECL Differential Clock Output 8 V PWR 2.5V or 3.3V Power Supply DD October 2010 2 M9999-100410-A hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc. SM843001-212 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (V , V ,)........................................+4.6V Supply Voltage (V ).............................+2.375V to +3.465V DDA DD IN Input Voltage (V )................................−0.50V to V +0.5V Ambient Temperature (T )..........................–40°C to +85°C IN DD A LVPECL Output Current (I ) Junction Thermal Resistance OUT Continuous..................................................................50mA TSSOP (θ )(Still Air).......................................141°C/W JA Surge.........................................................................100mA Lead Temperature (soldering, 20sec.).......................260°C Case Temperature.....................................................115°C Storage Temperature (T ).........................−65°C to +150°C s DC Electrical Characteristics(3) V = V = 3.3V ±5%; T = –40°C to +85°C, unless noted. DD DDA A Symbol Parameter Condition Min. Typ. Max. Units V Core Supply Voltage 3.135 3.30 3.465 V DD V Analog Supply Voltage 3.135 3.30 3.465 V DDA I Analog Supply Current 48 60 mA DDA I Total Supply Current No load 87 110 mA EE V = V = 2.5V ±5%; T = –40°C to +85°C, unless noted. DD DDA A Symbol Parameter Condition Min. Typ. Max. Units V Core Supply Voltage 2.375 2.50 2.625 V DD V Analog Supply Voltage 2.375 2.50 2.625 V DDA I Analog Supply Current 48 60 mA DDA I Total Supply Current No load 80 100 mA EE LVPECL DC Electrical Characteristics(3)(4) V = V = 2.5V ±5% or 3.3V ±5%, T = –40°C to +85°C, unless noted. DD DDA A 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 M9999-100410-A hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc. SM843001-212 AC Electrical Characteristics(5) V = V = 2.5V ±5% or 3.3V ±5%, T = –40°C to +85°C, unless noted. DD DDA A Symbol Parameter Condition Min. Typ. Max. Units F Output Frequency 26.5625MHz Crystal 212.5 MHz OUT t RMS Phase Jitter (Output = 212.5 MHz) Integration Range: 637kHz to 10MHz 170 fs JITTER t / t Output rise/fall time 20% to 80% 80 150 350 ps R F O Output Duty Cycle 48 50 52 % DC 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 Min. Typ. Max. Units Mode of Oscillation 12pF Load Fundamental, Parallel Resonant Frequency 26.5625 MHz Equivalent Series Resistance (ESR) 50 Ω Shunt Capacitor, C0 3 7 pF Correlation Drive Level 100 300 uW October 2010 4 M9999-100410-A hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc. SM843001-212 Figure 1. Duty Cycle Timing Figure 2. All Outputs Rise/Fall Time Figure 3. RMS Phase Noise/Jitter October 2010 5 M9999-100410-A hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc. SM843001-212 Figure 4. LVPECL Output Load and Test Circuit Figure 5. Crystal Input Interface October 2010 6 M9999-100410-A hbwhelp@micrel.com or (408) 955-1690

Micrel, Inc. SM843001-212 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 M9999-100410-A hbwhelp@micrel.com or (408) 955-1690

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