ASM3I2879AF-06OR

September 2005 rev 1.4 Low Power Peak Reducing EMI Solution Features Generates an EMI optimized clock signal at the output. Integrated loop filter components. Operates with a 3.3V /2.5V Supply. Operating current less than 4mA. Low power CMOS design. Input frequency range: 13MHz to 30MHz for 2.5V : 13MHz to 30MHz for 3.3V Generates a 1X low EMI spread spectrum clock of the input frequency. Frequency deviation: ±1% @ 24MHz Available in 6-pin TSOT-23, 8-pin SOIC and 8-pin TSSOP packages. ASM3P2879A The ASM3P2879A uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all digital method. The ASM3P2879A 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 results 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’. Applications The ASM3P2879A is targeted towards all portable devices with very low power requirements like MP3 players, Notebooks and digital still cameras. Product Description The ASM3P2879A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2879A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock dependent signals. The ASM3P2879A allows significant system cost savings by reducing the number of circuit board layers ferrite beads, shielding that are traditionally required to pass EMI regulations. Key Specifications Description Supply voltages Cycle-to-Cycle Jitter Output Duty Cycle Modulation Rate Equation Frequency Deviation Specification VDD = 2.5V / 3.3V 200pS (Max) 45/55% FIN/640 ±1% @ 24MHz Block Diagram VDD XIN Crystal Oscillator Frequency Divider Feedback Divider Modulation PLL XOUT Phase Detector Loop Filter VCO Output Divider ModOUT REFOUT VSS Alliance Semiconductor 2575 Augustine Drive • Santa Clara, CA • Tel: 408.855.4900 • Fax: 408.855.4999 • www.alsc.com Notice: The information in this document is subject to change without notice. September 2005 rev 1.4 Pin Configuration (6-pin TSOT-23 Package) ASM3P2879A REFOUT XOUT 1 2 6 VSS ModOUT VDD ASM3P2879A 5 4 XIN/CLKIN 3 Pin# 1 2 3 4 5 6 Pin Name REFOUT XOUT XIN/CLKIN VDD ModOUT VSS Type O O I P O P Description Buffered output of the input frequency. Crystal connection. If using an external reference, this pin must be left unconnected. Crystal connection or external reference frequency input. This pin has dual functions. It can be connected either to an external crystal or an external reference clock. Power supply for the entire chip (3.3V) Spread spectrum clock output. Ground connection. Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 2 of 12 September 2005 rev 1.4 Pin Configuration (8-pin SOIC and TSSOP Packages) XIN/CLKIN XOUT 1 2 8 VDD 7 6 ASM3P2879A ASM3P2879A NC ModOUT REFOUT 3 NC 4 5 VSS Pin Description Pin# 1 2 3 4 5 6 7 8 Pin Name XIN/CLKIN XOUT REFOUT NC VSS ModOUT NC VDD Type I O O P O P Description Crystal connection or external reference frequency input. 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. Buffered output of the input frequency. No connect. Ground connection. Spread spectrum clock output. No connect. Power supply for the entire chip Modulation Profile Specifications Description Frequency Range For 2.5V Supply For 3.3V Supply Modulation Equation Frequency Deviation Specification 13MHz < CLKIN < 30MHz 13MHz < CLKIN < 30MHz FIN/640 ±1% @ 24MHz Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 3 of 12 September 2005 rev 1.4 Absolute Maximum Ratings Symbol VDD, VIN TSTG TA Ts TJ TDV Storage temperature Operating temperature Max. Soldering Temperature (10 sec) Junction Temperature Static Discharge Voltage (As per JEDEC STD22- A114-B) ASM3P2879A Parameter Rating -0.5 to +7.0 -65 to +125 0 to 70 260 150 2 Unit V °C °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. DC Electrical Characteristics for 2.5V Supply (Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated) Symbol VIL VIH IIL IIH IXOL IXOH VOL VOH IDD ICC VDD tON ZOUT Input low voltage Input high voltage Input low current Input high current Parameter Min VSS - 0.3 2.0 1.8 2.375 - Typ 3 3 1.2 3.5 2.5 50 Max 0.8 VDD + 0.3 -35 35 0.6 2.625 5 - Unit V V µA µA mA mA V V mA mA V mS Ω XOUT output low current (@0.5V, VDD=2.5V) XOUT output high current (@1.8V, VDD=2.5V) Output low voltage (VDD = 2.5 V, IOL = 8mA) Output high voltage (VDD = 2.5 V, IOH = 8mA) Static supply current * Dynamic supply current (2.5V, 24MHz and with no load) Operating Voltage Power-up time (first locked cycle after power-up) Output impedance * XIN/CLKIN pin is pulled low AC Electrical Characteristics for 2.5V Supply Symbol CLKIN ModOUT fd tLH* tHL* tJC tD Input frequency Output frequency Frequency Deviation Input Frequency = 13MHz Input Frequency = 30MHz Parameter Min 13 13 0.8 0.5 45 Typ ±1.75 ±0.80 1.7 0.9 50 Max 30 30 1.9 1.2 200 55 Unit MHz MHz % nS nS pS % Output rise time (measured from 0.7V to 1.7V) Output fall time (measured from 1.7V to 0.7V) Jitter (cycle to cycle) Output duty cycle * tLH and tHL are measured into a capacitive load of 15pF Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 4 of 12 September 2005 rev 1.4 DC Electrical Characteristics for 3.3V Supply (Test condition: All parameters are measured at room temperature (+ 25°C) unless otherwise stated) ASM3P2879A Symbol VIL VIH IIL IIH IXOL IXOH VOL VOH IDD ICC VDD tON ZOUT Input low voltage Input high voltage Input low current Input high current Parameter Min VSS - 0.3 2.0 2.5 2.7 - Typ 3 3 1.2 4.5 3.3 45 Max 0.8 VDD + 0.3 -35 35 0.4 3.6 5 - Unit V V µA µA mA mA V V mA mA V mS Ω XOUT output low current (@0.4V, VDD=3.3V) XOUT output high current (@2.5V, VDD=3.3V) Output low voltage (VDD = 3.3 V, IOL = 8mA) Output high voltage (VDD = 3.3 V, IOH = 8mA) Static supply current * Dynamic supply current (3.3V, 24MHz and with no load) Operating Voltage Power-up time (first locked cycle after power-up) Clock output impedance * XIN/CLKIN pin is pulled low AC Electrical Characteristics for 3.3V Supply Symbol CLKIN ModOUT fd tLH* tHL* tJC tD Input frequency Output frequency Frequency Deviation Input Frequency = 13MHz Input Frequency = 30MHz Parameter Min 13 13 0.6 0.4 45 Typ ±1.75 ±0.80 1.6 1.0 50 Max 30 30 1.8 1.2 200 55 Unit MHz MHz % nS nS pS % Output rise time (measured from 0.8 to 2.0V) Output fall time (measured at 2.0V to 0.8V) Jitter (cycle to cycle) Output duty cycle *tLH and tHL are measured into a capacitive load of 15pF Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 5 of 12 September 2005 rev 1.4 Typical Crystal Oscillator Circuit ASM3P2879A Crystal R1 = 510Ω C1 = 27 pF C2 = 27 pF Typical Crystal Specifications Fundamental AT cut parallel resonant crystal Nominal frequency Frequency tolerance Operating temperature range Storage temperature Load capacitance Shunt capacitance ESR 14.31818MHz ± 50 ppm or better at 25°C -25°C to +85°C -40°C to +85°C 18pF 7pF maximum 25Ω Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 6 of 12 September 2005 rev 1.4 Package Information 6-pin TSOT-23 Package ASM3P2879A Dimensions Symbol Min A A1 A2 b H D B e C L θ 0.00 0.033 0.012 Inches Max 0.04 0.004 0.036 0.02 Millimeters Min Max 1.00 0.00 0.84 0.30 0.127 BSC 2.90 BSC 1.60 BSC 0.950 BSC 2.80 BSC 0.30 0° 0.50 4° 0.10 0.90 0.50 0.005 BSC 0.114 BSC 0.06 BSC 0.0374 BSC 0.11 BSC 0.0118 0° 0.02 4° Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 7 of 12 September 2005 rev 1.4 ASM3P2879A 8-Pin SOIC Package E H D A2 A θ e B A 1 C L D Dimensions Symbol Min A1 A A2 B C D E e H L θ Inches Max 0.010 0.069 0.059 0.020 0.010 0.004 0.053 0.049 0.012 0.007 Millimeters Min Max 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° 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° Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 8 of 12 September 2005 rev 1.4 8-Pin TSSOP Package ASM3P2879A H E D A2 A θ e B A1 L C Dimensions Symbol Min A A1 A2 B c D E e H L θ 0.020 0° 0.002 0.033 0.008 0.004 0.114 0.169 0.026 BSC 0.252 BSC 0.028 8° 0.50 0° Inches Max 0.043 0.006 0.037 0.012 0.008 0.122 0.177 0.05 0.85 0.19 0.09 2.90 4.30 Millimeters Min Max 1.10 0.15 0.95 0.30 0.20 3.10 4.50 0.65 BSC 6.40 BSC 0.70 8° Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 9 of 12 September 2005 rev 1.4 Ordering Information Part Number ASM3P2879AF-06OR ASM3P2879AF-08TT ASM3P2879AF-08TR ASM3P2879AF-08ST ASM3P2879AF-08SR ASM3P2879AG-06OR ASM3P2879AG-08TT ASM3P2879AG-08TR ASM3P2879AG-08ST ASM3P2879AG-08SR ASM3P2879A-06OR ASM3P2879A-08TT ASM3P2879A-08TR ASM3P2879A-08ST ASM3P2879A-08SR ASM3I2879AF-06OR ASM3I2879AF-08TT ASM3I2879AF-08TR ASM3I2879AF-08ST ASM3I2879AF-08SR ASM3I2879AG-06OR ASM3I2879AG-08TT ASM3I2879AG-08TR ASM3I2879AG-08ST ASM3I2879AG-08SR ASM3I2879A-06OR ASM3I2879A-08TT ASM3I2879A-08TR ASM3I2879A-08ST ASM3I2879A-08SR ASM3P2879A Marking D4LL 3P2879AF 3P2879AF 3P2879AF 3P2879AF D3LL 3P2879AG 3P2879AG 3P2879AG 3P2879AG D1LL 3P2879A 3P2879A 3P2879A 3P2879A D5LL 3I2879AF 3I2879AF 3I2879AF 3I2879AF D6LL 3I2879AG 3I2879AG 3I2879AG 3I2879AG D2LL 3I2879A 3I2879A 3I2879A 3I2879A Package Type 6-Pin TSOT-23, TAPE & REEL, Pb Free 8-Pin TSSOP, TUBE, Pb Free 8-Pin TSSOP, TAPE & REEL, Pb Free 8-Pin SOIC, TUBE, Pb Free 8-Pin SOIC, TAPE & REEL, Pb Free 6-Pin TSOT-23, TAPE & REEL, Green 8-Pin TSSOP, TUBE, Green 8-Pin TSSOP, TAPE & REEL, Green 8-Pin SOIC, TUBE, Green 8-Pin SOIC, TAPE & REEL, Green 6-Pin TSOT-23, TAPE & REEL 8-Pin TSSOP, TUBE 8-Pin TSSOP, TAPE & REEL 8-Pin SOIC, TUBE 8-Pin SOIC, TAPE & REEL 6-Pin TSOT-23, TAPE & REEL, Pb Free 8-Pin TSSOP, TUBE, Pb Free 8-Pin TSSOP, TAPE & REEL, Pb Free 8-Pin SOIC, TUBE, Pb Free 8-Pin SOIC, TAPE & REEL, Pb Free 6-Pin TSOT-23, TAPE & REEL, Green 8-Pin TSSOP, TUBE, Green 8-Pin TSSOP, TAPE & REEL, Green 8-Pin SOIC, TUBE, Green 8-Pin SOIC, TAPE & REEL, Green 6-Pin TSOT-23, TAPE & REEL 8-Pin TSSOP, TUBE 8-Pin TSSOP, TAPE & REEL 8-Pin SOIC, TUBE 8-Pin SOIC, TAPE & REEL Temperature Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Commercial Industrial Industrial Industrial Industrial Industrial Industrial Industrial Industrial Industrial Industrial Industrial Industrial Industrial Industrial Industrial Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 10 of 12 September 2005 rev 1.4 Device Ordering Information ASM3P2879A ASM3P2879AF-08TR R = Tape & reel, T = Tube or Tray O = SOT S = SOIC T = TSSOP A = SSOP V = TVSOP B = BGA Q = QFN 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 U = MSOP E = TQFP L = LQFP U = MSOP P = PDIP D = QSOP X = SC-70 ALLIANCE SEMICONDUCTOR MIXED SIGNAL PRODUCT Licensed under U.S Patent Nos 5,488,627 and 5,631,921 Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 11 of 12 September 2005 rev 1.4 ASM3P2879A 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 Preliminary Information Part Number: ASM3P2879A Document Version: v1.4 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. Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 12 of 12