SM802124 ClockWorks™ DUAL 125MHz Ultra-Low Jitter, CMOS Frequency Synthesizer General Description Features The SM802124 is a member of the ClockWorks™ family of devices from Micrel and provides an extremely low-noise timing solution for Ethernet 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 two CMOS output clocks at 125MHz from a 15MHz LVCMOS reference clock. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. • Generates two LVCMOS clock outputs at 125MHz • 2.5V or 3.3V operating range • Typical rms phase jitter @ 125MHz 1.875MHz to 20MHz : 85fs (Input source dependent) • Industrial temperature range (–40°C to +85°C) • Green, RoHS, and PFOS compliant • Available in 24-pin 4mm × 4mm QFN package HU UH Applications • Gigabit Ethernet 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 M9999-101311-B [email protected] or (408) 955-1690 Micrel, Inc. SM802124 Ordering Information(1) Part Number Marking Shipping Temperature Range Package SM802124UMG 802124 Tube –40°C to +85°C 24-Pin QFN SM802124UMGTR 802124 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 (code) (Top View) September 2011 M9999-101311-B [email protected] or (408) 955-1690 Micrel, Inc. SM802124 Pin Description Pin Number Pin Name Pin Type Pin Level Pin Function 17 Q0 O CMOS 125MHz Clock Output 180 deg,125MHz Clock Output 21 Q1 O CMOS 3, 4, 16 , 20, 23, 24 NC - - 1, 18 VDDO PWR Power Supply for Output 2, 22 VSSO PWR Power Supply Ground for Output No Connection. Do not connect anything to these pins. PLL Bypass, Selects Output Source 5 PLL_BYPASS I, (SE) LVCMOS 0 = Normal PLL Operation 1 = Output from Input Reference Clock 45KΩ pull-down 7, 10, 11, 12, 15, 19 TEST Factory Test pins, Do not connect anything to these pins. 8 VDD PWR Core Power Supply 6, 13 , 14 VSS PWR Core Power Supply Ground 9 REF_IN I, (SE) September 2011 LVCMOS Reference Clock Input M9999-101311-B [email protected] or (408) 955-1690 Micrel, Inc. SM802124 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VDD, VDDO)......................................... +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, VDDO)...................+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 = VDDO = 3.3V ±5% or 2.5V ±5% VDD = 3.3V ±5%, VDDO = 2.5V ±5% TA = −40°C to +85°C. Symbol Parameter VDD, VDDO Condition Min. Typ. Max. Units 2.5V Operating Voltage 2.375 2.5 2.625 V VDD, VDDO 3.3V Operating Voltage 3.135 3.3 3.465 V IDD Supply current VDD + VDDO 70 90 mA Typ Max Units Outputs open LVCMOS OUTPUT DC Electrical Characteristics(4) VDD = VDDO = 3.3V ±5% or 2.5V ±5% VDD = 3.3V ±5%, VDDO = 2.5V ±5% TA = −40°C to +85°C. RL = 50Ω to VDDO/2. Symbol VOH VOL Parameter Condition Min Output High Voltage Fig. 4 VDD -0.7 Output Low Voltage Fig. 4 V 0.6 V LVCMOS (PLL_BYPASS) DC Electrical Characteristics(4) VDD = 3.3V ±5%, or 2.5V ±5%, TA = −40°C to +85°C. Symbol Parameter VIH Input High Voltage Condition 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 −5 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 September 2011 Condition Min. VIN = 0V to VDD 4 Typ. Max. Units 1.1 VDD + 0.3 V −0.3 0.6 V −5 5 μA M9999-101311-B [email protected] or (408) 955-1690 Micrel, Inc. SM802124 AC Electrical Characteristics(4, 5) VDD = VDDO = 3.3V±5% or 2.5V±5% VDD = 3.3V±5%, VDDO = 2.5V±5% TA = 40°C to 85°C. RL = 50Ω to VDDO/2 Symbol Parameter FOUT Output Frequency FREF Reference Input Frequency TR/TF LVCMOS Output Rise/Fall Time ODC Output Duty Cycle TLOCK PLL Lock Time Tjit(∅) RMS Phase Jitter (6) Spurious Noise Components Condition Min. Typ. Max. 125 MHz 15 20% – 80% Units MHz 100 300 500 45 50 55 % 20 ms Integration Range (1.875MHz – 20MHz) Integration Range (12kHz – 20MHz) 85 320 5MHz 10MHz 20MHz 25MHz -73 -82 -89 -96 ps fs dBc 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 after thermal equilibrium has been established. 5. All phase-noise measurements were taken with an Agilent 5052B phase-noise system. 6. Ref_IN driven with a low-noise source ClockWorks SM802001 programmed for a 15MHz CMOS output. Phase noise will track the input phase noise up to about 1MHz offset frequency. September 2011 5 M9999-101311-B [email protected] or (408) 955-1690 Micrel, Inc. SM802124 Phase Noise Plots Phase Noise Plot: 125MHz, 1.875MHz − 20MHz 73fS Phase Noise Plot: 125MHz, 12kHz − 20MHz 318fS September 2011 6 M9999-101311-B [email protected] or (408) 955-1690 Micrel, Inc. SM802124 Timing Diagrams Figure 1. Duty Cycle Timing Figure 2. All outputs Rise/Fall Time Figure 3. RMS Phase/Noise Jitter September 2011 7 M9999-101311-B [email protected] or (408) 955-1690 Micrel, Inc. SM802124 Input and Output Stage Figure 4. CMOS Output Load and Test Circuit September 2011 8 M9999-101311-B [email protected] or (408) 955-1690 Micrel, Inc. SM802124 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 HU UH 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 9 M9999-101311-B [email protected] or (408) 955-1690