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| PCS3P2537A Peak EMI Reduction IC Features * 1x Peak EMI Reduction IC * Input Frequency: 18MHz-36MHz * Output Frequency: 18MHz-36MHz * Frequency Deviation @ 27MHz: -0.25% * Modulation Rate @ 27MHz: 30.1KHz * Supply Voltage: 3.3V 0.3V * Operating current less than 8mA @ 27MHz * Spread Spectrum Enable Control * CMOS design * 8L-WDFN (8L-TDFN) package PCS3P2537A modulates the output of a single PLL in order to "spread" the bandwidth of a synthesized clock, and more importantly, decreases the peak amplitudes of its harmonics. This result in significantly lower system EMI compared to the typical narrow band signal produced by oscillators and most frequency generators. Lowering EMI by increasing a signal's bandwidth is called `spread spectrum clock generation.' PCS3P2537A has a frequency range of 18MHz-36MHz, and accepts input clock either from a Crystal or from an external reference and locks on to it delivering a 1x spread spectrum clock output. It has an SSON control for enabling and disabling Spread Spectrum function. PCS3P2537A operates with a supply voltage of 3.3V, and is available in 8 L-WDFN package. Product Description PCS3P2537A is a 1x spread spectrum frequency modulator designed to reduce electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The device allows significant system cost savings by reducing the number of circuit board layers, ferrite beads and shielding and other passive components that are traditionally required to pass EMI regulations. Application PCS3P2537A is targeted towards PC peripheral devices and embedded systems. Block Diagram VDD SSON CLKIN / XIN XOUT Crystal Oscillator PLL ModOUT GND (c)2010 SCILLC. All rights reserved. JANUARY 2010 - Rev. 1 Publication Order Number: PCS3P2537/D PCS3P2537A Pin Configuration (8L-WDFN Package) CLKIN / XIN 1 XOUT 2 PCS3P2537A SSON 3 NC 4 8 7 6 5 VDD NC ModOUT GND Pin Description Pin# 1 2 3 4 5 6 7 8 Pin Name CLKIN / XIN XOUT SSON NC GND ModOUT NC VDD Type I O I Description External reference Clock input or Crystal connection. This pin has dual functions. It can be connected either to an external crystal or an external reference clock. Crystal connection. If using an external reference, this pin must be left unconnected. When SSON is HIGH, the spread spectrum is enabled and when LOW, it turns off the spread spectrum. No Connect. P O Ground connection. Spread Spectrum Clock Output. No Connect. P Power supply for the entire chip. Rev. 1 | Page 2 of 7 | www.onsemi.com PCS3P2537A Absolute Maximum Ratings Symbol VDD, VIN TSTG Ts TJ TDV Storage temperature Max. Soldering Temperature (10 sec) Junction Temperature Static Discharge Voltage (As per JEDEC STD22- A114-B) Parameter Rating -0.5 to +4.6 -65 to +125 260 150 2 Unit V C C C KV Voltage on any pin with respect to Ground Note: These are stress ratings only and are not implied for functional use. Exposure to absolute maximum ratings for prolonged periods of time may affect device reliability. Operating Conditions Parameter VDD TA CL CIN Supply Voltage Operating Temperature (Ambient Temperature) Load Capacitance Input Capacitance Description Min 3.0 0 Max 3.6 70 15 7 Unit V C pF pF DC Electrical Characteristics for 3.3V Supply Symbol Parameter VIL VIH IIL IIH VOL VOH IDD ICC VDD tON ZOUT Input low voltage Input high voltage Input low current Input high current Output low voltage (VDD = 3.3V, IOL = 8mA) Output high voltage (VDD = 3.3V, IOH = 8mA) Static supply current Operating Voltage Power-up time (first locked cycle after power-up) Output impedance 1 Min VSS-0.3 2.0 Typ Max 0.8 VDD+0.3 -35 35 0.4 Unit V V A A V V mA mA V mS 2.5 2.5 5 3 3.3 36 8 3.6 5 Dynamic supply current (3.3V, 27MHz and no load) Note: 1. CLKIN is pulled to GND. Rev. 1 | Page 3 of 7 | www.onsemi.com PCS3P2537A AC Electrical Characteristics for 3.3V Supply Symbol CLKIN ModOUT fd MR 1 tLH Parameter Input frequency Output frequency Frequency Deviation @ 27MHz Modulation Rate @ 27MHz Output rise time (measured from 20% to 80%) Output fall time (measured at 80% to 20%) Cycle-to-Cycle Jitter at 27MHz Output duty cycle Min 18 18 -0.2 30 Typ 27 27 -0.25 Max 36 36 -0.3 33 2 1.5 Unit MHz MHz % KHz nS nS pS % tHL 1 tJC tD 200 45 50 300 55 Note: 1. tLH and tHL are measured into a capacitive load of 15pF. Rev. 1 | Page 4 of 7 | www.onsemi.com PCS3P2537A Typical Application Schematic VDD CLKIN / XIN VDD 0 3 1 2 CLKIN / XIN XOUT SSON NC VDD 8 NC 7 ModOUT 6 GND 5 0.01uF 0 4 Note: Refer to Pin Description table for Functionality Details. PCB Layout Recommendation For optimum device performance, the following guidelines are recommended. * Dedicated VDD and GND planes. * The device must be isolated from system power supply noise. A 0.01F decoupling capacitor should be mounted 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 VDD pin and the ground via should be kept as short as possible. All the VDD pins should have decoupling capacitors. * In an optimum layout all components are on the same side of the board, minimizing vias through other signal layers. A typical layout is shown in the figure As short as possible CLKIN XOUT SSON NC VDD NC Modout GND GND Rev. 1 | Page 5 of 7 | www.onsemi.com PCS3P2537A Package Information 8L-WDFN package Symbol A A3 b D E e L Dimensions Inches Millimeters Min Max Min Max 0.027 0.008 0.077 0.077 0.020 0.0315 0.012 0.080 0.080 0.024 0.70 0.20 1.95 1.95 0.50 0.80 0.203 BSC 0.30 2.05 2.05 0.50 BSC 0.60 0.008 BSC 0.020 BSC Rev. 1 | Page 6 of 7 | www.onsemi.com PCS3P2537A Ordering Code Part Number PCS3P2537AG-08CR Top Marking AM Package 8L-WDFN (8L-TDFN) - TAPE & REEL, Green Temperature 0 to +70 C C A "microdot" placed at the end of last row of marking or just below the last row toward the center of package indicates Pb-free. Licensed under US patent #5,488,627, #6,646,463 and #5,631,920. Note: This product utilizes US Patent #6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003. ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. U.S Patent Pending; Timing-Safe and Active Bead are trademarks of PulseCore Semiconductor, a wholly owned subsidiary of ON Semiconductor. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81-3-5773-3850 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative |
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