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| December 2004 rev 0.7 Peak EMI Reducing Solution Features Generates an EMI optimized clock signal at output. Input frequency: 25 MHz. Frequency outputs: o o USB Clock (48 MHz unmodulated) 50 MHz (modulated), 1% centre spread ASM3P2853A shielding that are required to pass EMI regulations. The ASM3P2853A modulates the output of PLL in order to spread the bandwidth of a synthesized clock, thereby decreasing the peak amplitudes of its harmonics. This results in significantly lower system EMI compared to the typical narrow band signal produced by oscillators and most clock generators. Lowering EMI by increasing a signal's bandwidth is called spread spectrum clock generation. Modulation rate: 39 KHz. Spread Spectrum ON/OFF control Supply voltage range 2.5V 5%. Available in 8-pin SOIC package. Commercial Temperature range. Applications ASM3P2853A is targeted towards EMI management for high speed digital applications such as PC peripheral devices, consumer electronics and embedded controller systems. Product Description The ASM3P2853A is a versatile spread spectrum frequency modulator. The ASM3P2853A reduces electromagnetic interference (EMI) at the clock source. The ASM3P2853A allows significant system cost savings by reducing the number of circuit board layers and Block Diagram VDD PWDNB XIN XOUT Crystal Oscillator PLL1 USB Clock (48 MHz Unmodulated) 50 MHz Modulated SSONB PLL2 VSS Alliance Semiconductor 2575 Augustine Drive * Santa Clara CA * Tel: 408-855-4900 * Fax: 408-855-4999 * www.alsc.com December 2004 rev 0.7 Pin Configuration ASM3P2853A XIN XOUT VDD VSS 1 2 3 4 8 50 MHz USB Clock SSONB PWDNB 7 ASM3P2853A 6 5 Pin Description Pin Name XIN Type I Description Connection to crystal or external reference frequency input. This pin has dual functions. It can be connected either to an external crystal or an external reference clock. Connection to crystal. If using an external reference clock, this pin must be left unconnected. Power supply for the analog and digital blocks Ground to entire chip. Power-down control pin. Pull low to enable the power-down mode. Connect to VDD, if not used. Digital logic input used to enable spread spectrum function (Active LOW). Spread spectrum is enabled when LOW, disabled when HIGH. Clock output -1 (48 MHz unmodulated) Clock output -2 (50 MHz modulated) XOUT VDD VSS PWDNB SSONB USB Clock 50 MHz O P P I I O O Peak EMI Reducing Solution 2 of 8 December 2004 rev 0.7 Absolute Maximum Ratings Symbol VDD VI VO IIK IOK TJ Input voltage, DC Output voltage, DC Input clamp current (VI<0 or VI>VDD) Output clamp current (VI<0 or VI>VDD) Junction temperature Lead temperature (soldering 10 sec) Input static discharge voltage protection (MIL -STD 883E, Method 3015.7) reliability. ASM3P2853A Parameter Supply voltage, DC Rating (VSS - 0.5) to 7 (VSS-0.5) to (VDD+0.5) (VSS-0.5) to (VDD + 0.5) -50 to +50 -50 to +50 150 260 2 Unit V V V mA mA C C kV Note: These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for extended periods may affect device Operating Conditions Parameter Supply Voltage Ambient Operating Temperature Range Crystal Resonator Frequency Output Driver Load Capacitance FXIN CL 25 15 MHz pF Symbol VDD TA Condition / Description 2.5V 5% Min 2.375 0 Typ 2.5 - Max 2.625 +70 Unit V C Crystal Specifications Fundamental AT cut parallel resonant crystal Nominal frequency Frequency tolerance Operating temperature range Storage temperature Load capacitance Shunt capacitance ESR 25 MHz 50 ppm or better at 25C -25C to +85C -40C to +85C 18pF 7pF maximum 25 Peak EMI Reducing Solution 3 of 8 December 2004 rev 0.7 DC Electrical Characteristics Parameter Overall Supply Current, Dynamic Supply Current, Static IDD IDDL VDD=2.5V, FXIN=25MHz, CL=15pF VDD = 2.5V, XIN = 0, PWDNB =0 15 20 1.5 ASM3P2853A Symbol Conditions / Description Min Typ Max Unit 25 - mA mA All input pins High-Level Input Voltage Low-Level Input Voltage High-Level Input Current Low-Level Input Current (pull-up) VIH VIL IIH IIL VDD=2.5V VDD=2.5V 1.7 0.7 25 -25 V V A A Clock Outputs High-Level Output Source Current Low-Level Output Sink Current High-Level Output Source Current Low-Level Output Sink Current IxOH IxOL IOH IOL VDD= 2.5V ,V(XIN) = 0, VO=2V VDD= V(XIN) =2.5V, VO=0.4V VO=2V VO=0.4V -10 10 -12 12 8 -15 15 mA mA mA - 8 - mA Output Impedance ZO - 42 - Peak EMI Reducing Solution 4 of 8 December 2004 rev 0.7 AC Electrical Characteristics Parameter Rise Time* ASM3P2853A Symbol tr level Conditions/ Description Measured from 20% to 80% of the signal Min - Typ 2 Max - Unit nS Measured from 80% to 20% of the signal Fall Time* Jitter (Cycle to Cycle) Jitter (Period) Clock Duty Cycle tp Ratio of pulse width (as measured from td rising edge to next falling edge at VDD/2) to one clock period 45 50 55 % 175 pS tjc 200 pS tf level 1.2 nS * CL = 15 pF, Input clock frequency = 25 MHz Peak EMI Reducing Solution 5 of 8 December 2004 rev 0.7 Package Information ASM3P2853A 8-Pin SOIC package E H D A2 A C e B A 1 D L Dimensions Symbol Min A1 A A2 B C D E e H L O 0.004 0.053 0.049 0.012 0.007 Inches Max 0.010 0.069 0.059 0.020 0.010 Millimeters Min 0.10 1.35 1.25 0.31 0.18 4.90 BSC 3.91 BSC 1.27 BSC 6.00 BSC 0.41 0 1.27 8 Max 0.25 1.75 1.50 0.51 0.25 0.193 BSC 0.154 BSC 0.050 BSC 0.236 BSC 0.016 0 0.050 8 Peak EMI Reducing Solution 6 of 8 December 2004 rev 0.7 Ordering Codes Part number ASM3P2853AF-08-ST ASM3P2853AF-08-SR ASM3P2853A Package Configuration 8-pin SOIC ,TUBE 8-pin SOIC, TAPE & REEL Temperature Range Commercial Commercial Ordering Information ASM3P2853AF-08-SR OR - SOT23/T/R TT - TSSOP, TUBE TR - TSSOP, T/R QT - QFN, TUBE BT - BGA, TUBE BR - BGA, T/R ST - SOIC, TUBE SR - SOIC, T/R QR - QFN, T/R VT - TVSOP, TUBE VR - TVSOP, T/R JR - SSOP, T/R JT - SSOP, TUBE PIN COUNT Pb FREE PART NUMBER X = Automotive (-40C to +125C) I = Industrial (-40C to +85C) P or n/c = Commercial (0C to +70C) 1 - reserved 2 - Non PLL based 3 - EMI Reduction 4 - DDR support products 6 - power management 7 - power management 8 - power management 9 - Hi performance Alliance Semiconductor Mixed Signal Product Licensed under US patent #5,488,627, #6,646,463 and #5,631,920. Peak EMI Reducing Solution 7 of 8 December 2004 rev 0.7 ASM3P2853A Alliance Semiconductor Corporation 2575, Augustine Drive, Santa Clara, CA 95054 Tel# 408-855-4900 Fax: 408-855-4999 www.alsc.com Copyright (c) Alliance Semiconductor All Rights Reserved Preliminary Information Part Number: ASM3P2853A Document Version: v0.7 Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to Alliance Semiconductor, dated 11-11-2003 (c) 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 EMI Reducing Solution 8 of 8 |
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