MK2727STR

DATASHEET MK2727 LOW COST 27 MHZ VCXO Description Features The MK2727 is IDT’s lowest cost, low-jitter, high-performance VCXO and PLL clock synthesizer designed to replace expensive 27MHz VCXOs. The on-chip Voltage Controlled Crystal Oscillator accepts a 0 to 3V input voltage to cause the output clocks to vary by ±100 ppm. Using IDT’s patented VCXO and analog Phase-Locked Loop (PLL) techniques, the device uses an inexpensive external 13.5 MHz pullable crystal input to produce a 27 MHz output clock. • • • • • • • Packaged in 8-pin narrow SOIC Uses an inexpensive 13.500 MHz external crystal On-chip VCXO with pull range of 200 ppm (minimum) VCXO input tuning voltage 0 to 3.3 V 25 mA output drive capability at TTL levels Advanced, low-power, sub-micron CMOS process 5 V operating voltage NOTE: EOL for non-green parts to occur on 5/13/10 per PDN U-09-01 IDT manufactures the largest variety of Set-Top Box and multimedia clock synthesizers for all applications. If more clock outputs are needed, see the MK2731 or MK277x family of parts. Consult IDT to eliminate VCXOs, crystals and oscillators from your board. Block Diagram VIN 13.5 MHz Pullable Crystal IDT™ LOW COST 27 MHZ VCXO X1 X2 Voltage Controlled Crystal Oscillator PLL/Clock Synthesis Circuitry 1 27 MHz MK2727 REV D 122109 MK2727 LOW COST 27 MHZ VCXO VCXO Pin Assignment X1 1 8 X2 VDD 2 7 GND VIN 3 6 VDD GND 4 5 CLK 8-Pin (150 mil) SOIC Pin Descriptions Pin Number Pin Name Pin Type 1 XI Input Crystal connection. Connect to a pullable 13.5 MHz crystal. 2 VDD Power Connect to +5 V. 3 VIN Input Voltage input to VCXO. Zero to 3 V analog input which controls the frequency of the VCXO. 4 GND Power Connect to ground. 5 CLK Output 27 MHz clock output. 6 VDD Power Connect to +5 V. 7 GND Power Connect to ground. 8 X2 Input Crystal connection. Connect to a pullable 13.5 MHz crystal. IDT™ LOW COST 27 MHZ VCXO Pin Description 2 MK2727 REV D 122109 MK2727 LOW COST 27 MHZ VCXO VCXO External Component Selection specified for use with the MK2727 is designed to have zero frequency error when the total of on-chip + stray capacitance is 14 pF. The MK2727 requires a minimum number of external components for proper operation. Recommended Crystal Parameters: Initial Accuracy at 25° C Temperature Stability Aging Load Capacitance Shunt Capacitance, C0 C0/C1 Ratio Equivalent Series Resistance Decoupling Capacitor A decoupling capacitor of 0.01µF must be connected between VDD (pin 2) and GND (pin 4), as close to these pins as possible. For optimum device performance, the decoupling capacitor should be mounted on the component side of the PCB. Avoid the use of vias in the decoupling circuit. Series Termination Resistor The external crystal must be connected as close to the chip as possible and should be on the same side of the PCB as the MK2727. There should be no vias between the crystal pins and the X1 and X2 device pins. There should be no signal traces underneath or close to the crystal. When the PCB trace between the clock output (CLK, pin 5) and the load is over 1 inch, series termination should be used. To series terminate a 50Ω trace (a commonly used trace impedance), place a 33Ω resistor in series with the clock line, as close to the clock output pin as possible. The nominal impedance of the clock output is 20Ω. Crystal Tuning Load Capacitors Quartz Crystal The crystal traces should include pads for small fixed capacitors, one between X1 and ground, and another between X2 and ground. The need for these capacitors is determined at system prototype evaluation, and is influenced by the particular crystal used (manufacture and frequency) and by PCB layout. The typical required capacitor value is 1 to 4 pF. The MK2727 VCXO function consists of the external crystal and the integrated VCXO oscillator circuit. To assure the best system performance (frequency pull range) and reliability, a crystal device with the recommended parameters (shown below) must be used, and the layout guidelines discussed in the following section shown must be followed. The procedure for determining the value of these capacitors can be found in application note MAN05. The frequency of oscillation of a quartz crystal is determined by its “cut” and by the load capacitors connected to it. The MK2727 incorporates on-chip variable load capacitors that “pull” (change) the frequency of the crystal. The crystal IDT™ LOW COST 27 MHZ VCXO ±20 ppm ±30 ppm ±20 ppm 14 pf 7 pF Max 250 Max 35Ω Max 3 MK2727 REV D 122109 MK2727 LOW COST 27 MHZ VCXO VCXO Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the MK2727. 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 +70° C Storage Temperature -65 to +150° C Soldering Temperature 260° C Recommended Operation Conditions Parameter Min. Ambient Operating Temperature Typ. 0 Power Supply Voltage (measured in respect to GND) +4.75 5.0 Reference crystal parameters Max. Units +70 °C +5.25 V Refer to page 3 DC Electrical Characteristics VDD=5 V ±5% , Ambient temperature 0 to +70° C, unless stated otherwise Parameter Symbol Conditions Operating Voltage VDD Output High Voltage VOH IOH = -25 mA Output Low Voltage VOL IOL = 25 mA Output High Voltage (CMOS Level) VOH IOH = -8 mA Operating Supply Current IDD No load Short Circuit Current IOS VIN, VCXO Control Voltage VIA IDT™ LOW COST 27 MHZ VCXO Min. Typ. 4.75 Units 5.25 V 2.4 V 0.4 VDD-0.4 0 4 Max. V V 20 mA ±100 mA 3 MK2727 V REV D 122109 MK2727 LOW COST 27 MHZ VCXO VCXO AC Electrical Characteristics VDD = 5 V ±5%, Ambient Temperature 0 to +70° C, unless stated otherwise Parameter Symbol Conditions Min. Input Crystal Frequncy Typ. Max. Units 13.500 Input Crystal Accuracy MHz +30 ppm Output Clock Rise Time tOR 0.8 to 2.0 V 1.5 ns Output Clock Fall Time tOF 2.0 to 0.8 V 1.5 ns Outpu Clock Duty Cycle tD Measured at 1.4 V 60 % Maximum Absolute Jitter, short term tJ 27 MHz Output Pullability 40 50 200 0V < VIN < 3 V, Note 1 ps +100 ppm Note 1: External crystal device must conform with Pullable Crystal Specifications listed on page 3. Thermal Characteristics Parameter Thermal Resistance Junction to Ambient Thermal Resistance Junction to Case IDT™ LOW COST 27 MHZ VCXO Symbol Conditions Min. Typ. Max. Units θJA Still air 150 ° C/W θJA 1 m/s air flow 140 ° C/W θJA 3 m/s air flow 120 ° C/W 40 ° C/W θJC 5 MK2727 REV D 122109 MK2727 LOW COST 27 MHZ VCXO VCXO Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Narrow Body) Package dimensions are kept current with JEDEC Publication No. 95 Millimeters 8 Symbol E A A1 B C D E e H h L α H INDEX AREA 1 2 D Min Max 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° A Inches Min 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 MK2727S* MK2727STR* MK2727SLF MK2727SLFTR MK2727S MK2727S 2727SL 2727SL Tubes Tape and Reel Tubes Tape and Reel 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC Temperature 0 to +70° 0 to +70° 0 to +70° 0 to +70° C C C C *NOTE: EOL for non-green parts to occur on 5/13/10 per PDN U-09-01 “LF” denotes Pb (lead) free package. While the information presented herein has been checked for both accuracy and reliability, Integrated Device Technology (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 COST 27 MHZ VCXO 6 MK2727 REV D 122109 MK2727 LOW COST 27 MHZ VCXO VCXO 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 © 2006 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice. IDT and the IDT logo are trademarks of Integrated Device Technology, Inc. Accelerated Thinking is a service mark of Integrated Device Technology, Inc. All other brands, product names and marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners. Printed in USA