ASM3P2111B May 2005 rev 0.1 Peak EMI Reducing Solution Features allows significant system cost savings by reducing the number of circuit board layers and shielding that are Generates an EMI optimized clock at the output. required to pass EMI regulations. The ASM3P2111B Input frequency: 25 MHz. modulates the output of PLL in order to spread the Frequency outputs: bandwidth of a synthesized clock, thereby decreasing the o 60 MHz (unmodulated) peak amplitudes of its harmonics. This results in o 2 x 48 MHz (unmodulated) significantly lower system EMI compared to the typical o 66.6 MHz (modulated): -1.7% down spread narrow band signal produced by oscillators and most Modulation rate: 30 KHz. clock generators. Lowering EMI by increasing a signal’s Supply voltage range: 3.3V ± 0.3V. bandwidth is called spread spectrum clock generation. Available in 8-pin SOIC Package. Commercial and Industrial Temperature range. RoHS Compliant Applications ASM3P2111B is targeted towards EMI management for Product Description high speed digital applications such as PC peripheral devices, consumer electronics and embedded controller The ASM3P2111B is a versatile spread spectrum frequency modulator that reduces systems. electromagnetic interference (EMI) at the clock source. The ASM3P2111B Block Diagram VDD XIN /CLKIN XOUT 60 MHz Crystal Oscillator PLL1 48 MHz_1 48 MHz_2 48 MHz_1 PLL2 66.6 MHz Modulated VSS Alliance Semiconductor 2575 Augustine Drive • Santa Clara CA • Tel: 408-855-4900 • Fax: 408-855-4999 • www.alsc.com ASM3P2111B May 2005 rev 0.1 Pin Configuration XIN/ CLKIN 1 8 VSS 7 66.6 MHz XOUT 2 VDD 3 6 48 MHz_1 4 5 48 MHz_2 60 MHz ASM3P2111B Pin Description Description Pin # Pin Name Type 1 XIN / CLKIN I Connection to crystal 2 XOUT O Connection to crystal 3 VDD P Power supply for the analog and digital blocks (+3.3V) 4 60 MHz O Clock output-1 60 MHz un-modulated 5 48 MHz_2 O Clock output-2 48 MHz_2 un-modulated 6 48 MHz_1 O Clock output-3 48 MHz_1 un-modulated 7 66.6 MHz O Clock output-4 66.6 MHz modulated 8 VSS P Ground to entire chip. Connect to System Ground Peak Reducing EMI Solution 2 of 8 ASM3P2111B May 2005 rev 0.1 Absolute Maximum Ratings Symbol VDD, VIN TSTG Parameter Rating Unit Voltage on any pin with respect to Ground -0.5 to +7.0 V Storage temperature -65 to +125 °C 0 to 70 °C TA Operating temperature Ts Max. Soldering Temperature (10 sec) 260 °C TJ Junction Temperature Static Discharge Voltage (As per JEDEC STD 22- A114-B) 150 °C 2 KV TDV 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 Symbol Condition / Description Min Typ Max Unit Supply Voltage VDD 3.3V ± 0.3V 3 3.3 3.6 V Crystal Resonator Frequency FXIN 25 - - MHz CL - - 15 pF Output Driver Load Capacitance Peak Reducing EMI Solution 3 of 8 ASM3P2111B May 2005 rev 0.1 DC Electrical Characteristics Parameter Symbol Conditions / Description Min Typ Max Unit IDD VDD=3.3V, FCLK =25MHz, CL=15pF 41 48 62 mA IDDL VDD = 3.3V, Clock Input = 0 20 25 35 mA VIH VDD=3.3V 2.0 - VDD+0.3 V VIL VDD=3.3V VSS-0.3 - 0.8 V IIH -1 - 1 µA IIL -20 -36 -80 µA Overall Supply Current, Dynamic Supply Current, Static All input pins High-Level Input Voltage Low-Level Input Voltage High-Level Input Current Low-Level Input Current (pull-up) High-Level Output Source Current Low-Level Output Sink Current IxOH VDD=V (XIN) = 3.3V, VO=0.4V - 3 - mA IxOL VDD=3.3V, V (XIN)=VO=2.5V - 3 - mA IOH VO=2.5V - -20 - mA IOL VO=0.4V - 23 - mA ZOH VO=0.5VDD; output driving high - 29 - ZOL Vo=0.5VDD; output driving low - 27 - Ω Clock Outputs High-Level Output Source Current Low-Level Output Sink Current Output Impedance AC Electrical Characteristics Parameter Symbol Rise Time tr Fall Time tf Clock Duty Cycle Conditions/ Description VO = 0.8V to 2.0V; CL = 15pF VO = 2.0V to 0.8V; CL = 15pF Min Typ Max Unit 300 800 900 pS 360 800 900 pS 45 - 55 % Ratio of pulse width (as measured from rising edge to next falling edge at VDD /2) to one clock period * CL = 15 pF, Input clock frequency = 25 MHz Peak Reducing EMI Solution 4 of 8 ASM3P2111B May 2005 rev 0.1 Typical Crystal Oscillator Circuit Crystal R1 = 510Ω C1 = 27 pF C2 = 27 pF Typical Crystal Specifications Fundamental AT cut parallel resonant crystal Nominal frequency 25 MHz Frequency tolerance ± 50 ppm or better at 25°C Operating temperature range -25°C to +85°C Storage temperature -40°C to +85°C Load capacitance 18pF Shunt capacitance 7pF maximum ESR 25 Ω Peak Reducing EMI Solution 5 of 8 ASM3P2111B May 2005 rev 0.1 Package Information 8-Pin SOIC Package H E D A2 A C A1 D θ e L B Dimensions Symbol 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 Inches 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° Peak Reducing EMI Solution 6 of 8 ASM3P2111B May 2005 rev 0.1 Ordering Codes Part number Marking ASM3P2111BF-08ST 3P2111BF 8-pin SOIC TUBE, Pb Free Commercial ASM3P2111BF-08SR 3P2111BF 8-pin SOIC TAPE & REEL, Pb Free Commercial ASM3I2111BF-08ST 3I2111BF 8-pin SOIC TUBE, Pb Free Industrial ASM3I2111BF-08SR 3I2111BF 8-pin SOIC TAPE & REEL, Pb Free Industrial ASM3P2111BG-08ST 3P2111BG 8-pin SOIC TUBE, Green Commercial ASM3P2111BG-08SR 3P2111BG 8-pin SOIC TAPE & REEL, Green Commercial ASM3I2111BG-08ST 3I2111BG 8-pin SOIC TUBE, Green Industrial ASM3I2111BG-08SR 3I2111BG 8-pin SOIC TAPE & REEL, Green Industrial Package Configuration Temperature Range Ordering Information A S M 3 P 2 1 1 1 B F - 0 8 S 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 PART 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 ALLIANCE SEMICONDUCTOR MIXED SIGNAL PRODUCT Licensed under US patent #5,488,627, #6,646,463 and #5,631,920. Peak Reducing EMI Solution 7 of 8 ASM3P2111B May 2005 rev 0.1 Alliance Semiconductor Corporation 2575, Augustine Drive, Santa Clara, CA 95054 Tel# 408-855-4900 Fax: 408-855-4999 www.alsc.com Copyright © Alliance Semiconductor All Rights Reserved Part Number: ASM3P2111B Document Version: v0.1 Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to Alliance Semiconductor, dated 11-11-2003 © Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are trademarks or registered trademarks of Alliance. All other brand and product names may be the trademarks of their respective companies. Alliance reserves the right to make changes to this document and its products at any time without notice. Alliance assumes no responsibility for any errors that may appear in this document. The data contained herein represents Alliance's best data and/or estimates at the time of issuance. Alliance 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. Alliance 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 Alliance 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 Alliance's Terms and Conditions of Sale (which are available from Alliance). All sales of Alliance products are made exclusively according to Alliance's Terms and Conditions of Sale. The purchase of products from Alliance does not convey a license under any patent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of Alliance or third parties. Alliance 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 Alliance products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use. Peak Reducing EMI Solution 8 of 8