ASM3P2531A February 2007 rev 1.4 Low Frequency EMI Reduction Features dependent signals. It allows significant system cost • FCC approved method of EMI attenuation. savings by reducing the number of circuit board layers • Generates a low EMI spread spectrum of the and input clock frequency. regulations. • • traditionally required to pass EMI Optimized for input frequency range between 27MHz – 55MHz. The ASM3P2531A modulates the output of a single PLL Internal loop filter minimizes external in order to spread the bandwidth of a synthesized clock, thereby decreasing the peak amplitudes of its harmonics. components and board space. This result in significantly lower system EMI compared to • Frequency Deviation: ±1.7%. • Low inherent Cycle-to-cycle jitter. • 3.3 V ± 0.3V Operating Voltage. • Ultra low power CMOS design:3.0 mA @ 3.3 V. • Supports notebook VGA and other LCD timing the typical narrow band signal produced by oscillators and most clock generators. Lowering EMI by increasing controller applications. • shielding Available in 8-pin SOIC and TSSOP Packages. a signal’s bandwidth is called spread spectrum clock generation. The ASM3P2531A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all-digital method. Product Description The ASM3P2531A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. It reduces electromagnetic interference (EMI) at the clock source allowing systemwide reduction of EMI of downstream clock and data Applications The ASM3P2531A is targeted toward the notebook VGA chip and other displays using an LVDS interface, PC peripheral devices, and embedded systems. Block Diagram VDD STOP PLL Modulation CLKIN Crystal Oscillator Frequency Divider Feedback Divider Phase Detector Loop Filter VCO Output Divider ModOUT VSS PulseCore Semiconductor Corporation 1715 S. Bascom Ave Suite 200, Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018 www.pulsecoresemi.com Notice: The information in this document is subject to change without notice. ASM3P2531A February 2007 rev 1.4 Pin Configuration (8-pin SOIC and TSSOP Packages) CLKIN 1 VDD 2 8 NC 7 NC ASM3P2531A VSS 3 6 NC ModOUT 4 5 STOP Spread Range Selection, VDD = 3.3 V CLKIN frequency Spreading range Modulation rate 27MHz – 55MHz ± 1.7% (CLKIN/1280) KHz Pin Description Pin# Pin Name Type Description 1 CLKIN I External reference frequency input. 2 VDD P Power supply for the entire chip. 3 VSS P Ground to entire chip. 4 ModOUT O Spread spectrum clock output or reference output.( Refer Standby Mode Selection.) 5 STOP I Active LOW signal. When HIGH, enables ModOUT and when LOW, ModOUT would be LOW. 6 NC - No connect. 7 NC - No connect. 8 NC - No connect. Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 2 of 8 ASM3P2531A February 2007 rev 1.4 Schematic for a Typical Application Input clock 27MHz – 55MHz VDD FB : Optional ferrite bead FB 0.1uF 1 CLKIN NC 8 2 VDD NC ASM3P2531A 7 3 VSS NC 6 4 ModOUT GND EMI reduced clock output 27MHz – 55MHz STOP 5 VDD 0Ω 0Ω Use either pull-up or pull-down resistors with 0Ω Absolute Maximum Ratings Symbol Parameter VDD, VIN TSTG TA Rating Unit Voltage on any pin with respect to Ground -0.5 to +4.6 V Storage temperature -65 to +125 °C Operating temperature -40 to +85 °C Ts Max. Soldering Temperature (10 sec) 260 °C TJ Junction Temperature 150 °C 2 KV TDV Static Discharge Voltage (As per JEDEC STD22- A114-B) 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. Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 3 of 8 ASM3P2531A February 2007 rev 1.4 DC Electrical Characteristics Symbol Parameter Min Typ Max Unit V VIL Input low voltage VSS - 0.3 0.8 VIH Input high voltage 2.0 VDD + 0.3 V IIL Input low current -35 µA IIH Input high current 35 µA VOL Output low voltage VDD = 3.3V, IOL = 6 mA 0.4 V VOH Output high voltage VDD = 3.3V, IOH = 15 mA IDD Static supply current standby mode ICC Dynamic supply current VDD Operating voltage tON Power-up time (first locked cycle after power up) ZOUT 3.3V and 15pF loading 2.5 V 3.0 10 3.0 Clock output impedance 3.3 mA 14 mA 3.6 V 0.18 mS 50 Ω AC Electrical Characteristics Symbol fIN Parameter Input frequency Min Typ 27 Unit 55 MHz fOUT Output frequency 55 MHz tLH 1 Output rise time Measured from 0.8 V to 2.0 V 0.4 0.6 1.2 nS Output fall time Measured from 2.0 V to 0.8 V 0.4 0.6 1.2 nS 360 pS 55 % tHL 1 27 Max tJC Jitter (Cycle to cycle) TD Output duty cycle 45 50 Note 1: tLH and tHL are measured into a capacitive load of 15pF Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 4 of 8 ASM3P2531A February 2007 rev 1.4 Package Information 8-lead (150-mil) SOIC Package H E D A2 A C A1 D θ e L B Dimensions Symbol Inches Min Max Millimeters Min Max A1 0.004 0.010 0.10 0.25 A 0.053 0.069 1.35 1.75 A2 0.049 0.059 1.25 1.50 B 0.012 0.020 0.31 0.51 C 0.007 0.010 0.18 0.25 D 0.193 BSC 4.90 BSC E 0.154 BSC 3.91 BSC e 0.050 BSC 1.27 BSC H 0.236 BSC 6.00 BSC L 0.016 0.050 0.41 1.27 θ 0° 8° 0° 8° Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 5 of 8 ASM3P2531A February 2007 rev 1.4 8-lead Thin Shrunk Small Outline Package (4.40-MM Body) H E D A2 A C θ e A1 L B Dimensions Symbol Inches Min Millimeters Max A Min Max 0.043 1.10 A1 0.002 0.006 0.05 0.15 A2 0.033 0.037 0.85 0.95 B 0.008 0.012 0.19 0.30 c 0.004 0.008 0.09 0.20 D 0.114 0.122 2.90 3.10 E 0.169 0.177 4.30 4.50 e 0.026 BSC 0.65 BSC H 0.252 BSC 6.40 BSC L 0.020 0.028 0.50 0.70 θ 0° 8° 0° 8° Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 6 of 8 ASM3P2531A February 2007 rev 1.4 Ordering Information Ordering Code Marking Package Type Operating Range ASM3P2531AF-08ST 3P2531AF 8-pin 150mil SOIC –TUBE, Pb free Commercial ASM3P2531AF-08SR 3P2531AF 8-pin 150-mil SOIC -TAPE & REEL, Pb free Commercial ASM3I2531AF-08ST 3P2531AF 8-pin 150mil SOIC -TUBE, Pb free Industrial ASM3I2531AF-08SR 3P2531AF 8-pin 150-mil SOIC -TAPE & REEL, Pb free Industrial ASM3P2531AF-08TT 3P2531AF 8-pin 4.4mm TSSOP -TUBE, Pb free Commercial ASM3P2531AF-08TR 3P2531AF 8-pin 4.4mm TSSOP -TAPE & REEL, Pb free Commercial ASM3I2531AF-08TT 3P2531AF 8-pin 4.4mm TSSOP -TUBE, Pb free ASM3I2531AF-08TR 3P2531AF 8-pin 4.4mm TSSOP - TAPE & REEL, Pb free ASM3P2531AG-08ST 3P2531AG 8-pin 150mil SOIC –TUBE, Green Commercial ASM3P2531AG-08SR 3P2531AG 8-pin 150-mil SOIC -TAPE & REEL, Green Commercial ASM3I2531AG-08ST 3P2531AG 8-pin 150mil SOIC -TUBE, Green Industrial ASM3I2531AG-08SR 3P2531AG 8-pin 150-mil SOIC -TAPE & REEL, Green Industrial ASM3P2531AG-08TT 3P2531AG 8-pin 4.4mm TSSOP -TUBE, Green Commercial ASM3P2531AG-08TR 3P2531AG 8-pin 4.4mm TSSOP -TAPE & REEL, Green Commercial ASM3I2531AG-08TT 3P2531AG 8-pin 4.4mm TSSOP -TUBE, Green Industrial ASM3I2531AG-08TR 3P2531AG 8-pin 4.4mm TSSOP - TAPE & REEL, Green Industrial Industrial Industrial Device Ordering Information A S M 3 P 2 5 3 1 A F - 0 8 T R R = Tape & Reel, T = Tube or Tray O = SOT S = SOIC T = TSSOP A = SSOP V = TVSOP B = BGA Q = QFN U = MSOP E = TQFP L = LQFP U = MSOP P = PDIP D = QSOP X = SC-70 DEVICE PIN COUNT F = LEAD FREE AND RoHS COMPLIANT PART G = GREEN PACKAGE, LEAD FREE, and RoHS DEVICE NUMBER X= Automotive I= Industrial P or n/c = Commercial (-40C to +125C) (-40C to +85C) (0C to +70C) 1 = Reserved 2 = Non PLL based 3 = EMI Reduction 4 = DDR support products 5 = STD Zero Delay Buffer 6 = Power Management 7 = Power Management 8 = Power Management 9 = Hi Performance 0 = Reserved PulseCore Semiconductor Mixed Signal Product Licensed under US patent #5,488,627, #6,646,463 and #5,631,920. Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 7 of 8 ASM3P2531A February 2007 rev 1.4 PulseCore Semiconductor Corporation 1715 S. Bascom Ave Suite 200 Campbell, CA 95008 Tel: 408-879-9077 Fax: 408-879-9018 www.pulsecoresemi.com Copyright © PulseCore Semiconductor All Rights Reserved Part Number: ASM3P2531A Document Version: v1.4 Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to PulseCore Semiconductor, dated 11-11-2003 © Copyright 2007 PulseCore Semiconductor Corporation. All rights reserved. Our logo and name are trademarks or registered trademarks of PulseCore Semiconductor. All other brand and product names may be the trademarks of their respective companies. PulseCore reserves the right to make changes to this document and its products at any time without notice. PulseCore assumes no responsibility for any errors that may appear in this document. The data contained herein represents PulseCore’s best data and/or estimates at the time of issuance. PulseCore reserves the right to change or correct this data at any time, without notice. If the product described herein is under development, significant changes to these specifications are possible. The information in this product data sheet is intended to be general descriptive information for potential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or customer. PulseCore does not assume any responsibility or liability arising out of the application or use of any product described herein, and disclaims any express or implied warranties related to the sale and/or use of PulseCore products including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any intellectual property rights, except as express agreed to in PulseCore’s Terms and Conditions of Sale (which are available from PulseCore). All sales of PulseCore products are made exclusively according to PulseCore’s Terms and Conditions of Sale. The purchase of products from PulseCore does not convey a license under any patent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of PulseCore or third parties. PulseCore does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure may reasonably be expected to result in significant injury to the user, and the inclusion of PulseCore products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify PulseCore against all claims arising from such use. Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 8 of 8