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Technical content
Features
Generates six LVDS 125MHz clocks and two HCSL 125MHz clocks 2.5V or 3.3V operating range Typical phase jitter @ 125 MHz (1.875MHz to 20MHz): 100fs Industrial temperature range (–40 C to +85C) Green, RoHS, and PFOS compliant Available in 44-pin 7mm 7mm QFN package Block Diagram
Ordering Information
Part Number Marking Shipping Temperature Range Package
Micrel, Inc. SM802120 September 2011 2 M9999-092911-A hbwhelp@micrel.com or (408) 955-1690 SM802120UMG 802120 Tray –40°C to +85°C 44-Pin QFN SM802120UMGTR 802120 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)
Micrel, Inc. SM802120 September 2011 3 M9999-092911-A hbwhelp@micrel.com or (408) 955-1690 Pin Description Pin Number Pin Name Pin Type Pin Level Pin Function 25, 26 28, 29 32, 33 35, 36 /Q1, Q1 /Q2, Q2 /Q3, Q3 /Q4, Q4 O, (DIF) LVDS Differential Clock Outputs from Bank 1 125MHz 41, 42 1, 2 /Q5, Q5 /Q6, Q6 O, (DIF) LVDS Differential Clock Outputs from Bank 2 125MHz 4, 5 7, 8 /Q7, Q7 /Q8, Q8 O, (DIF) HCSL Differential Clock Outputs from Bank 2 125MHz 31, 37, 38 VDDO1 PWR Power Su pply for the Outputs on Bank 1 43, 44, 16 VDDO2 PWR Power Su pply for the Outputs on Bank 2 24, 39 VSSO1 PWR Power Supply Ground for the Outputs on Bank 3, 6, 40 VSSO2 PWR Power Supply Ground for the Outputs on Bank 27, 30, 34 TEST Factory Test Pins. Do not connect anything to these pins. 12, 13 VDD PWR Core Power Supply 9, 21, 23 VSS (Exposed Pad) PWR Core Power Supply Ground. The exposed pad must be connected to the VSS ground plane. 18 XTAL_IN I, (SE) Crystal Crystal Reference Input, no load caps needed. See Fig. 7.
19 XTAL_OUT O, (SE) Crystal
Crystal Reference Output, no load caps needed. See Fig. 7.
15 OE1 I, (SE) LVCMOS Output Enable, Q1-Q4 disables to tri-state,
0 = Disabled, 1 = Enabled, 45KΩ pull-up
22 OE2 I, (SE) LVCMOS Output Enable, Q5-Q8 disables to tri-state,
0 = Disabled, 1 = Enabled, 45KΩ pull-up Truth Table OE1/2 OUTPUTS
0 Tri-state
1 HCSL / LVDS
Micrel, Inc. SM802120 September 2011 4 M9999-092911-A hbwhelp@micrel.com or (408) 955-1690
Application Information
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: hbwhelp@micrel.com LVDS Outputs LVDS outputs are to be terminated with 100Ω across Q and /Q. For best performance, load all outputs. Outputs can be DC or AC-coupled. HCSL Outputs HCSL outputs are to be terminated with 50Ω to VSS. For best performance, load all outputs. For AC-coupled or to change the termination, contact Micrel’s application group: hbwhelp@micrel.com.
Micrel, Inc. SM802120 September 2011 5 M9999-092911-A hbwhelp@micrel.com or (408) 955-1690 Absolute Maximum Ratings(1) Storage Temperature (T Operating Ratings(2) Junction Thermal Resistance(3) QFN ( JA) QFN ( JB) Symbol Parameter Condition Min Typ Max Units 3.3V Operating Voltage V DDO1=VDDO2 3.135 3.3 3.465 V VDD, VDDO1/2 2.5V Operating Voltage V DDO1=VDDO2 2.375 2.5 2.625 V IDD Total supply current Outputs loaded 185 240 mA LVCMOS INPUT (OE1, OE2) DC Electrical Characteristics(4) VDD = 3.3V 5%, or 2.5V 5%, TA = 40°C to 85°C. Symbol Parameter Condition Min Typ Max Units VIH Input High Voltage 2 VDD + 0.3 V VIL Input Low Voltage 0.3 0.8 V IIH Input High Current V DD = VIN = 3.465V 5 A IIL Input Low Current V DD = 3.465V, VIN = 0V 150 A across Q and /Q. Symbol Parameter Condition Min Typ Max Units VOD Differential Output Voltage Figures 1, 5 275 350 475 mV ΔVOD V OD Magnitude Change 40 mV VOS Offset Voltage 1.15 1.25 1.50 V ΔVOS V OS Magnitude Change 50 mV
Micrel, Inc. SM802120 September 2011 6 M9999-092911-A hbwhelp@micrel.com or (408) 955-1690 to VSS. Symbol Parameter Condition Min Typ Max VOH Output High Voltage Figures 1, 4 660 700 850 VOL Output Low Voltage -150 0 27 VCROSS Crossing Point Voltage 250 350 550 Crystal Characteristics Parameter Condition Min. Typ. Max. Units Mode of Oscillation 10pF to 12pF Load Fundamental, Parallel Resonant Frequency 25 MHz Equivalent Series Resistance (ESR) 50 Ω Shunt Capacitor, C0 1 5 pF Correlation Drive Level 10 100 uW Symbol Parameter Condition Min Typ Max Units FOUT Output Frequency 125 MHz TR/TF LVDS Output Rise/Fall Time 20% – 80%, Figures 2, 5 100 160 400 ps TR/TF HCSL Output Rise/Fall Time 20% – 80%, Figures 2, 4 150 300 450 ps ODC Output Duty Cycl e HCSL, LVDS outputs 48 50 52 % TLOCK PLL Lock Time 20 ms Integration Range:(12KHz – 20MHz) 250 fs RMS Phase Jitter(6) (Output = 125MHz LVDS) Integration Range:(1.875MHz – 20MHz) 100 fs Integration Range:(12KHz – 20MHz) 250 fs Tjit() RMS Phase Jitter(6) (Output = 125MHz HCSL) Integration Range:(1.875MHz – 20MHz) 100 fs 25MHz (LVDS outputs) -80 Spurious Noise Components 25MHz (HCSL outputs) -85 dBc 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. Measured using 25MHz 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.
Micrel, Inc. SM802120 September 2011 7 M9999-092911-A hbwhelp@micrel.com or (408) 955-1690 Phase Noise Plots 125MHz LVDS Integrated Jitter 12KHz-20MHz 252fs 125MHz LVDS Integrated Jitter 1.875MHz-20MHz 102fs
Micrel, Inc. SM802120 September 2011 8 M9999-092911-A hbwhelp@micrel.com or (408) 955-1690 Phase Noise Plots (Continued) 125MHz HCSL Integrated Jitter 12KHz-20MHz 250fs 125MHz HCSL Integrated Jitter 1.875MHz-20MHz 100fs
Micrel, Inc. SM802120 September 2011 11 M9999-092911-A hbwhelp@micrel.com or (408) 955-1690
Package Information
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.
Micrel, Inc. SM802120 September 2011 12 M9999-092911-A hbwhelp@micrel.com or (408) 955-1690 Revision Template History Date Change Description/Edits by: Rev. 8/4/10 Added new paragraph to disclaimer in bo iler plate. Per Colin Sturt. M.Galvan 14