MK5811ASLF

DATASHEET MK5811A LOW EMI CLOCK GENERATOR Description Features The MK5811A device generates a low EMI output clock from a clock or crystal input. The device is designed to dither a high emissions clock to lower EMI in consumer applications. Using IDT’s proprietary mix of analog and digital Phase Locked Loop (PLL) technology, the device spreads the frequency spectrum of the output and reduces the frequency amplitude peaks by several dB. The MK5811A offers both centered and down spread from a high-speed clock input. • • • • • Packaged in 8-pin SOIC • • • • • Input frequency range of 4 to 32 MHz For different multiplier configurations, use the MK5812 (2x) or MK5814 (4x). IDT offers many other clocks for computers and computer peripherals. Consult IDT when you need to remove crystals and oscillators from your board. Pb (lead) free package Provides a spread spectrum output clock Supports flat panel controllers Accepts a clock or crystal input (provides same frequency dithered output) Output frequency range of 4 to 32 MHz 1X frequency multiplication Center and down spread Peak reduction by 8 dB to 16 dB typical on 3rd through 19th odd harmonics • Low EMI feature can be disabled • Operating voltage of 3.3 V • Advanced, low-power CMOS process Block Diagram VDD S1:0 2 Spread Direction PLL Clock Synthesis and Spread Spectrum Circuitry FRSEL X1/CLK SSCLK Clock Buffer/ Crystal Ocsillator X2 The crystal requires external capacitors for accurate tuning of the clock IDT® LOW EMI CLOCK GENERATOR GND 1 MK5811A REV D 071014 MK5811A LOW EMI CLOCK GENERATOR SSCG Pin Assignment Spread Direction and Spread Percentage X1/ICLK 1 8 X2 GND 2 7 VDD S1 3 6 FRSEL S0 4 5 SSCLK 8-pin (150 mil) SOIC S1 Pin 3 S0 Pin 4 Spread Direction Spread Percentage 0 0 0 M M M 1 1 1 0 M 1 0 M 1 0 M 1 Center Center Center Center No Spread Down Down Down Down ±1.4 ±1.1 ±0.6 ±0.5 -1.6 -2.0 -0.7 -3.0 0 = connect to GND M = unconnected (floating) 1 = connect directly to VDD Frequency Selection Product FRSEL (pin 6) Input Freq. Range Multiplier Output Freq. Range MK5811 0 4.0 to 8.0 MHz X1 4.0 to 8.0 MHz 1 8.0 to 16.0MHz X1 8.0 to 16.0MHz M 16.0 to 32.0MHz X1 16.0 to 32.0MHz 0 4.0 to 8.0 MHz X2 8.0 to 16.0MHz 1 8.0 to 16.0MHz X2 16.0 to 32.0MHz M 16.0 to 32.0MHz X2 32.0 to 64.0MHz 0 4.0 to 8.0 MHz X4 16.0 to 32.0MHz 1 8.0 to 16.0MHz X4 32.0 to 64.0MHz M 16.0 to 32.0MHz X4 64.0 to 128MHz MK58121 MK58141 0 = connect to GND M = unconnected (floating) 1 = connect directly to VDD Note 1: The information in this datasheet does not apply to the MK5812 and MK5814 as each have independent datasheets available at www.idt.com. IDT® LOW EMI CLOCK GENERATOR 2 MK5811A REV D 071014 MK5811A LOW EMI CLOCK GENERATOR SSCG Pin Descriptions Pin Number Pin Name Pin Type Pin Description 1 X1/ICLK Input Connect to 4-32 MHz crystal or clock. 2 GND Power Connect to ground. 3 S1 Input Function select 1 input. Selects spread amount and direction per table above. (default-internal mid-level). 4 S0 Input Function select 0 input. Selects spread amount and direction per table above. (default-internal mid-level). 5 SSCLK Output 6 FRSEL Input Function select for input frequency range. Default to mid level “M”. 7 VDD Power Connect to +3.3 V. 8 X2 XO Clock output with Spread spectrum Crystal connection to 4-32 MHz crystal. Leave unconnected for clock External Components PCB Layout Recommendations For optimum device performance and lowest output phase noise, observe the following guidelines: The MK5811A requires a minimum number of external components for proper operation. 1) Mount the 0.01µF decoupling capacitor on the component side of the board as close to the VDD pin as possible. No vias should be used between the decoupling capacitor and VDD pin. The PCB trace to the VDD pin and the PCB trace to the ground via should be kept as short as possible. Decoupling Capacitor A decoupling capacitor of 0.01µF must be connected between VDD and GND on pins 7 and 2. Connect the capacitor as close to these pins as possible. For optimum device performance, mount the decoupling capacitor on the component side of the PCB. Avoid the use of vias in the decoupling circuit. 2) To minimize EMI, place the 20 series-termination resistor (if needed) close to the clock output. Series Termination Resistor Use series termination when the PCB trace between the clock output and the load is over 1 inch. To series terminate a 50 trace (a commonly used trace impedance), place a 20 resistor in series with the clock line. Place the resistor as close to the clock output pin as possible. The nominal impedance of the clock output is 30. 3) An optimum layout is one with all components on the same side of the board, thus minimizing vias through other signal layers. Other signal traces should be routed away from the MK5811A device. This includes signal traces located underneath the device, or on layers adjacent to the ground plane layer used by the device. Tri-level Select Pin Operation Crystal Information The S1 and S0 select pins are tri-level, meaning that they have three separate states to make the selections shown in the table on page 2. To select the M (mid) level, the connection to these pins must be eliminated by either floating them originally, or tri-stating the GPIO pins which drive the select pins. The crystal used should be a fundamental mode (do not use third overtone), parallel resonant crystal. To optimize the initial accuracy, connect crystal capacitors from pins X1 to ground and X2 to ground. The value of these capacitors is given by the following equation: Crystal caps (pF) = (CL - 6) x 2 In the equation, CL is the crystal load capacitance. For example, a crystal with a 16 pF load capacitance uses two 20 pF [(16-6) x 2] capacitors. IDT® LOW EMI CLOCK GENERATOR 3 MK5811A REV D 071014 MK5811A LOW EMI CLOCK GENERATOR SSCG Spread Spectrum Profile The MK5811A is a low EMI clock generator using a optimized frequency slew rate algorithm to facilitate down stream tracking of zero delay buffers and other PLL devices. Frequency Modulation Rate Time Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the MK5811A. These ratings, which are standard values for IDT commercially rated parts, are stress ratings only. Functional operation of the device, at these or any other conditions, above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range. Item Rating Supply Voltage, VDD 7V All Inputs and Outputs -0.5 V to VDD+0.5 V Ambient Operating Temperature 0 to +85C Storage Temperature -65 to +150C Junction Temperature 125C Soldering Temperature 260C Recommended Operation Conditions Parameter Min. Max. Units 0 +85 C +3.0 3.63 V Min. Typ. Max. Units 3.0 3.3 3.63 V 23 25 mA No load, at 3.3 V, Fin=24 MHz 30 mA No load, at 3.3 V, Fin=32 MHz 35 mA Ambient Operating Temperature Power Supply Voltage (measured in respect to GND) Typ. DC Electrical Characteristics Unless stated otherwise, VDD = 3.3 V ±10%, Ambient Temperature 0 to +85C Parameter Symbol Operating Voltage VDD Supply Current IDD Input High Voltage Input middle Voltage Input Low Voltage IDT® LOW EMI CLOCK GENERATOR Conditions No load, at 3.3 V, Fin=12 MHz VIH 0.85VDD VDD VDD V VIHM 0.4VDD 0.5VDD 0.6VDD V VIL 0.0 0.0 0.15VDD V 4 MK5811A REV D 071014 MK5811A LOW EMI CLOCK GENERATOR Parameter SSCG Symbol Conditions Min. Typ. Max. Units Output High Voltage VOH CMOS, IOH = 12 mA 2.4 V Output High Voltage VOH IOH = 24 mA 2.0 V Output Low Voltage VOL IOL = -12 mA 0.4 V IOL = -24 mA 1.2 V Input Capacitance Nominal Output Impedance CIN1 S0, S1, FRSEL pins 4 6 pF CIN2 X1, X2 pins 6 9 pF ZO  30 AC Electrical Characteristics Unless stated otherwise, VDD = 3.3 V ±10%, Ambient Temperature 0 to +85 C, CL = 15 pF Parameter Symbol Conditions Min. Typ. Max. Units Input Clock Frequency 4 32 MHz Output Clock Frequency 4 32 MHz 60 % 50 55 % Input Clock Duty Cycle Time above VDD/2 40 Output Clock Duty Cycle Time above 1.5 V 45 1 Fin=4MHz, Fout=4 MHz 350 800 ps Jitter1 Fin=8MHz, Fout=8 MHz 250 450 ps Cycle-to-cycle Jitter Cycle-to-cycle Output Rise Time tR 0.4 to 2.4 V 1.2 ns Output Fall Time tF 2.4 to 0.4 V 1.2 ns 8 to 16 dB EMI Peak Frequency Reduction Note 1: Spread is enabled. Thermal Characteristics for 8-pin SOIC Parameter Thermal Resistance Junction to Ambient Thermal Resistance Junction to Case Symbol Conditions Min. Typ. Max. Units JA Still air 150 C/W JA 1 m/s air flow 140 C/W JA 3 m/s air flow 120 C/W 40 C/W JC Marking Diagram MK5811AL ###### YYWW Notes: 1. “######” denotes lot number. 2. “YYWW” is the last two digits of the year and week the part was assembled. 3. “L” denotes Pb free. 4. Bottom marking: country of origin. IDT® LOW EMI CLOCK GENERATOR 5 MK5811A REV D 071014 MK5811A LOW EMI CLOCK GENERATOR SSCG Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Body) Package dimensions are kept current with JEDEC Publication No. 95 Millimeters 8 Symbol E Min A A1 B C D E e H h L  H INDEX AREA 1 2 D A Inches Max Min 1.35 1.75 0.10 0.25 0.33 0.51 0.19 0.25 4.80 5.00 3.80 4.00 1.27 BASIC 5.80 6.20 0.25 0.50 0.40 1.27 0 8 Max .0532 .0688 .0040 .0098 .013 .020 .0075 .0098 .1890 .1968 .1497 .1574 0.050 BASIC .2284 .2440 .010 .020 .016 .050 0 8 h x 45 A1 C -Ce B SEATING PLANE  L .10 (.004) C Ordering Information Part / Order Number Marking Shipping Packaging Package Temperature MK5811ASLF MK5811ASLFTR see page 5 Tubes Tape and Reel 8-pin SOIC 8-pin SOIC 0 to +85 C 0 to +85 C "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant. While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology, Inc. (IDT) assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recommended without additional processing by IDT. IDT reserves the right to change any circuitry or specifications without notice. IDT does not authorize or warrant any IDT product for use in life support devices or critical medical instruments. IDT® LOW EMI CLOCK GENERATOR 6 MK5811A REV D 071014 MK5811A LOW EMI CLOCK GENERATOR SSCG Innovate with IDT and accelerate your future networks. Contact: www.IDT.com For Sales For Tech Support 800-345-7015 408-284-8200 Fax: 408-284-2775 www.idt.com/go/clockhelp Corporate Headquarters Integrated Device Technology, Inc. www.idt.com © 2014 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. 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