SM802123 ClockWorks™ 125MHz/25MHz Ultra-Low Jitter, LVCMOS Frequency Synthesizer General Description Features The SM802123 is a member of the ClockWorks™ family of devices from Micrel and provides an extremely low-noise timing solution. It is based upon a unique patented RotaryWave® architecture that provides very-low phase noise. The device operates from a 2.5V or 3.3V power supply and synthesizes 16 LVCMOS output clocks, eight at 125MHz and eight at 25MHz. The SM802123 accepts a 25MHz LVCMOS reference input. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. • Generates eight LVCMOS output clocks at 125MHz and eight LVCMOS output clocks at 25MHz • 2.5V or 3.3V operating range • Typical phase jitter @ 125MHz (1.875MHz to 20MHz): 115fs • Industrial temperature range • Green, RoHS, and PFOS compliant • Available in 44-pin 7mm × 7mm QFN package Applications • Gigabit Ethernet – (GbE) ________________________________________________________________________________________________ Block Diagram Top Level Schematic 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 January 2012 M9999-012312-A [email protected] or (408) 955-1690 Micrel, Inc. SM802123 Ordering Information Part Number Marking Shipping Junction Temperature Range(1) Package SM802123UMG 802123 Tray –40°C to +85°C 44-Pin QFN SM802123UMGTR 802123 Tape and Reel –40°C to +85°C 44-Pin QFN Note: 1. Devices are Green, RoHS, and PFOS compliant. Pin Configuration 44-Pin QFN (Top View) Pin Description Pin Number Pin Name Pin Type Pin Level Pin Function 25, 26 28, 29 32, 33 35, 36 Q1, Q2 Q3, Q4 /Q5, /Q6 /Q7, /Q8 O, (DIF) LVCMOS Clock Outputs from Bank 1 (25MHz) . 41, 42 1, 2 4, 5 7, 8 Q9, Q10 /Q11, /Q12 /Q13, /Q14 Q15, Q16 O, (DIF) LVCMOS Clock Outputs from Bank 2 (125MHz). 31, 37, 38 VDDO1 PWR Power Supply for the Outputs on Bank 1. 43, 44, 16 VDDO2 PWR Power Supply for the Outputs on Bank 2. 24, 39 VSSO1 PWR Power Supply Ground for the Outputs on Bank 1. PWR Power Supply Ground for the Outputs on Bank 2. 3, 6, 40 VSSO2 11, 14, 18, 19, 20, 27, 30, 34 TEST 12, 13 VDD 10, 21, 23 January 2012 VSS (Exposed Pad) Factory Test Pins. Do not connect anything to these pins. PWR Core Power Supply. PWR Core Power Supply Ground. The exposed pad must be connected to the VSS ground plane. 2 M9999-012312-A [email protected] or (408) 955-1690 Micrel, Inc. SM802123 Pin Description (Continued) Pin Number Pin Name Pin Type Pin Level Pin Function 17 REF_IN I, (SE) LVCMOS Reference Clock Input 9 PLL_BYPASS I, (SE) LVCMOS PLL Bypass, Selects Output Source 0 = Normal PLL Operation 1 = Output from Input Reference Clock 45KΩ Pull-Down 15 OE1 I, (SE) LVCMOS Output Enable, Q1-/Q8 disables to tri-state, 0 = Disabled, 1 = Enabled, 45KΩ Pull-Up 22 OE2 I, (SE) LVCMOS Output Enable, Q9-Q16 disables to tri-state, 0 = Disabled, 1 = Enabled, 45KΩ Pull-Up Truth Table OE1/2 OUTPUTS 0 Tri-State 1 LVCMOS January 2012 3 M9999-012312-A [email protected] or (408) 955-1690 Micrel, Inc. SM802123 Absolute Maximum Ratings(1) Operating Ratings(2) Supply Voltage (VDD, VDDO1/2) ..................................... +4.6V Input Voltage (VIN)……….……… ........... –0.5V 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 (3) Junction Thermal Resistance QFN (θ JA) Still-Air ............................................................... 24°C/W QFN (ψ JB) Junction-to-Board ................................................ 8°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 IDD Parameter Condition Min. Typ. Max. Units 3.3V Operating Voltage VDDO1 = VDDO2 3.135 3.3 3.465 V 2.5V Operating Voltage VDDO1 = VDDO2 2.375 2.5 2.625 V Total supply current Outputs floating 130 170 mA Max. Units LVCMOS INPUT (OE1, OE2, PLL_BYPASS) DC Electrical Characteristics(4) VDD = 3.3V ±5%, or 2.5V ±5%, TA = −40°C to +85°C Symbol Parameter Condition Min. Typ. VIH Input High Voltage 2 VDD + 0.3 V VIN Input Low Voltage −0.3 0.8 V IIH Input High Current VDD = VIN = 3.465V 150 μA IIL Input Low Current VDD = 3.465V, VIN = 0V −150 μA LVCMOS OUTPUT 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 VDDO/2 Symbol Parameter Condition VOH Output High Voltage Figure 4 VOL Output Low Voltage Figure 4 Min. Typ. Max. VDDO – 0.7 Units V 0.6 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. 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. January 2012 4 M9999-012312-A [email protected] or (408) 955-1690 Micrel, Inc. SM802123 REF_IN 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 IIN Input Current Min. VIN = 0V to VDD Typ. Max. Units 1.1 VDD + 0.3 V −0.3 0.6 V −5 5 μA Max Units 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 VDDO/2 Symbol Parameter FOUT Output Frequency TR/TF LVCMOS Output Rise/Fall Time ODC Output Duty Cycle TLOCK PLL Lock Time Tjit(∅) RMS Phase Jitter (Output = 25MHz) Condition (6) Min Typ Q1 – /Q8 25 Q9 – Q16 125 20% – 80%, Fig. 2 MHz 100 200 500 ps 45 50 55 % 20 ms Integration Range:(12kHz – 5MHz) 5MHz limited by phase-noise system. 315 fs RMS Phase Jitter (6) (Output = 125MHz) Integration Range:(12kHz – 20MHz) 340 fs Integration Range:(1.875MHz – 20MHz) 115 fs Spurious Noise Components 25MHz −64 dBc Notes: 1. All phase-noise measurements were taken with an Agilent 5052B phase-noise system. 2. REF_IN driven with a low-noise source ClockWorks noise up to about 1MHz offset frequency. January 2012 TM SM802001 programmed for a 25MHz CMOS output. Phase noise will track the input phase 5 M9999-012312-A [email protected] or (408) 955-1690 Micrel, Inc. SM802123 Phase Noise Plots 125MHz LVCMOS Integrated Jitter 12kHz – 20MHz 339fs 125MHz LVCMOS Integrated Jitter 1.875MHz – 20MHz 114fs January 2012 6 M9999-012312-A [email protected] or (408) 955-1690 Micrel, Inc. SM802123 Phase Noise Plots (Continued) 25MHz LVCMOS Integrated Jitter 12kHz – 5MHz 315fs Input Source (25MHz LVCMOS) Programmed from a ClockworksTM Part January 2012 7 M9999-012312-A [email protected] or (408) 955-1690 Micrel, Inc. SM802123 Phase Noise Plots (Continued) 125MHz LVCMOS Output Waveform 25MHz LVCMOS Output Waveform January 2012 8 M9999-012312-A [email protected] or (408) 955-1690 Micrel, Inc. SM802123 Figure 2. All Outputs Rise/Fall Time Figure 1. Duty Cycle TIming Figure 4. LVCMOS Output Load and Test Circuit Figure 3. RMS Phase Noise/Jitter January 2012 9 M9999-012312-A [email protected] or (408) 955-1690 Micrel, Inc. SM802123 Package Information 44-Pin Package Type (QFN) 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. © 2012 Micrel, Incorporated. January 2012 10 M9999-012312-A [email protected] or (408) 955-1690 Micrel, Inc. SM802123 Revision Template History Date Change Description/Edits by: 8/4/10 Added new paragraph to disclaimer in boiler plate. Per Colin Sturt. M.Galvan January 2012 Rev. 11 14 M9999-012312-A [email protected] or (408) 955-1690 Micrel, Inc. SM802123 HBW Datasheet Revision History Part Number: Initial Release Date: Rev. Date Revisions Reason Engineer A January 2012 12 M9999-012312-A [email protected] or (408) 955-1690