ASM3P2872A October 2005 rev 1.6 Low Power Peak EMI Reducing Solution Features The ASM3P2872A uses the most efficient and optimized modulation profile approved by the FCC and is Generates an EMI optimized clock signal at the implemented by using a proprietary all digital method. output Integrated loop filter components Operates with a 3.3V / 2.5V supply Operating current less than 6mA Low power CMOS design Input frequency range: 13MHz to 30MHz for 2.5V The ASM3P2872A 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 : 13MHz to 30MHz for 3.3V Generates a 1X low EMI spread spectrum clock of the input frequency by oscillators and most frequency generators. Lowering EMI by increasing a signal’s bandwidth is called ‘spread spectrum clock generation’. Frequency deviation: -1.25% @ 30MHz Available in 6-pin TSOT-23, 8-pin SOIC and 8-pin Applications TSSOP packages. The ASM3P2872A is targeted towards all portable Product Description devices with very low power requirements like MP3 The ASM3P2872A is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2872A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock players, Notebooks and digital still cameras. Key Specifications Description Specification Supply voltages VDD = 3.3V /2.5V system cost savings by reducing the number of circuit Cycle-to-Cycle Jitter 200pS (Max) board layers ferrite beads, shielding that are traditionally Output Duty Cycle 45/55% (worst case) required to pass EMI regulations. Modulation Rate Equation FIN/640 Frequency Deviation -1.25% @ 30MHz dependent signals. The ASM3P2872A allows significant Block Diagram VDD PLL Modulation XIN XOUT Crystal Oscillator Frequency Divider Feedback Divider Phase Detector Loop Filter VCO Output Divider 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. ModOUT ASM3P2872A October 2005 rev 1.6 Pin Configuration (6-pin TSOT-23 Package) REFOUT 1 XOUT 2 ASM3P2872A XIN/CLKIN 3 6 VSS 5 ModOUT 4 VDD Pin Description Pin# Pin Name Type Description 1 REFOUT O Buffered output of the input frequency. 2 XOUT O Crystal connection. If using an external reference, this pin must be left unconnected. 3 XIN/CLKIN I 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. 4 VDD P Power supply for the entire chip 5 ModOUT O Spread spectrum clock output. 6 VSS P Ground connection. Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 2 of 12 ASM3P2872A October 2005 rev 1.6 Pin Configuration (8-pin SOIC and TSSOP Packages) XIN/CLKIN 1 XOUT 2 ASM3P2872A REFOUT 3 NC 8 VDD 7 NC 6 ModOUT 5 VSS 4 Pin Description Pin# Pin Name Type Description 1 XIN/CLKIN I 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. 2 XOUT O Crystal connection. If using an external reference, this pin must be left unconnected. 3 REFOUT O Buffered output of the input frequency. 4 NC - No connect. 5 VSS P Ground connection. 6 ModOUT O Spread spectrum clock output. 7 NC - No connect. 8 VDD P Power supply for the entire chip Modulation Profile Specifications Description Frequency Range For 2.5V Supply For 3.3V Supply Specification 13MHz < CLKIN < 30MHz 13MHz < CLKIN < 30MHz Modulation Equation FIN/640 Frequency Deviation -1.25% @ 30MHz Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 3 of 12 ASM3P2872A October 2005 rev 1.6 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 Junction Temperature 150 °C 2 KV TJ 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. DC Electrical Characteristics for 2.5V Supply (Test condition: All parameters are measured at room temperature (+25°C) unless otherwise stated) Symbol Parameter Min Typ Max Unit VIL Input low voltage VSS - 0.3 - 0.8 V VIH Input high voltage 2.0 - VDD + 0.3 V IIL Input low current - - -35 µA IIH Input high current - - 35 µA IXOL XOUT output low current (@0.5V, VDD=2.5V) - 3 - mA IXOH XOUT output high current (@1.8V, VDD=2.5V) - 3 - mA VOL Output low voltage (VDD = 2.5 V, IOL = 8 mA) - - 0.6 V VOH Output high voltage (VDD = 2.5 V, IOH = 8 mA) 1.8 - - V IDD Static supply current * - 1.1 - mA ICC Dynamic supply current (2.5V, 30MHz and with no load) - 4.0 - mA 2.375 2.5 2.625 V VDD tON ZOUT Operating voltage Power-up time (first locked cycle after power-up) - - 5 mS Output impedance - 50 - Ω Min Typ Max Unit * XIN/CLKIN pin is pulled low AC Electrical Characteristics for 2.5V Supply Symbol Parameter CLKIN Input frequency 13 - 30 MHz ModOUT Output frequency 13 - 30 MHz fd Frequency Deviation Input Frequency = 13MHz - -1.85 - Input Frequency = 30MHz - -0.9 - tLH* Output rise time (measured from 0.7V to 1.7V) 0.7 1.5 1.7 nS tHL* Output fall time (measured from 1.7V to 0.7V) 0.5 0.9 1.1 nS tJC Jitter (cycle to cycle) - - 200 pS tD Output duty cycle 45 50 55 % % * 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 ASM3P2872A October 2005 rev 1.6 DC Electrical Characteristics for 3.3V Supply (Test condition: All parameters are measured at room temperature (+ Symbol 25°C) unless otherwise stated) Parameter Min Typ Max Unit VIL Input low voltage VSS - 0.3 - 0.8 V VIH Input high voltage 2.0 - VDD + 0.3 V IIL Input low current - - -35 µA IIH Input high current - - 35 µA IXOL XOUT output low current (@0.4V, VDD=3.3V) - 3 - mA IXOH XOUT output high current (@2.5V, VDD=3.3V) - 3 - mA VOL Output low voltage (VDD = 3.3 V, IOL = 8 mA) - - 0.4 V VOH Output high voltage (VDD = 3.3 V, IOH = 8 mA) 2.5 - - V IDD Static supply current* - 1.2 - mA ICC VDD tON ZOUT Dynamic supply current (3.3V, 30MHz and with no load) - 5.5 - mA 2.7 3.3 3.6 V Power-up time (first locked cycle after power-up)** - - 5 mS Output impedance - 45 - Ω Operating voltage * XIN/CLKIN pin is pulled low AC Electrical Characteristics for 3.3V Supply Symbol Parameter Min Typ Max Unit CLKIN Input frequency 13 - 30 MHz ModOUT Output frequency 13 - 30 MHz fd Frequency Deviation Input Frequency = 13MHz - -1.85 - Input Frequency = 30MHz - -0.9 - tLH* Output rise time (measured from 0.8 to 2.0V) 0.5 1.4 1.7 nS tHL* Output fall time (measured at 2.0V to 0.8V) 0.4 0.9 1.1 nS tJC Jitter (cycle to cycle) - - 200 pS tD Output duty cycle 45 50 55 % % *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 ASM3P2872A October 2005 rev 1.6 Typical Crystal Oscillator Circuit R1 = 510Ω Crystal C1 = 27 pF C2 = 27 pF Typical Crystal Specifications Fundamental AT cut parallel resonant crystal Nominal frequency 14.31818MHz 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 25Ω Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 6 of 12 ASM3P2872A October 2005 rev 1.6 Package Information 6-pin TSOT-23 Package Dimensions Symbol Inches Min A Max Millimeters Min Max 0.04 1.00 A1 0.00 0.004 0.00 0.10 A2 0.033 0.036 0.84 0.90 b 0.012 0.02 0.30 0.50 H 0.005 BSC 0.127 BSC D 0.114 BSC 2.90 BSC B 0.06 BSC 1.60 BSC e 0.0374 BSC 0.950 BSC C 0.11 BSC 2.80 BSC L 0.0118 0.02 0.30 0.50 θ 0° 4° 0° 4° Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 7 of 12 ASM3P2872A October 2005 rev 1.6 8-Pin 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 Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 8 of 12 ASM3P2872A October 2005 rev 1.6 8-Pin TSSOP Package 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 Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 9 of 12 ASM3P2872A October 2005 rev 1.6 Ordering Information Part Number Marking ASM3P2872AF-06OR B4LL ASM3P2872AF-08TT Package Type Temperature 6-Pin TSOT-23, TAPE & REEL, Pb Free Commercial 3P2872AF 8-Pin TSSOP, TUBE, Pb Free Commercial ASM3P2872AF-08TR 3P2872AF 8-Pin TSSOP, TAPE & REEL, Pb Free Commercial ASM3P2872AF-08ST 3P2872AF 8-Pin SOIC, TUBE, Pb Free Commercial ASM3P2872AF-08SR 3P2872AF ASM3P2872AG-06OR B3LL ASM3P2872AG-08TT 8-Pin SOIC, TAPE & REEL, Pb Free Commercial 6-Pin TSOT-23, TAPE & REEL, Green Commercial 3P2872AG 8-Pin TSSOP, TUBE, Green Commercial ASM3P2872AG-08TR 3P2872AG 8-Pin TSSOP, TAPE & REEL, Green Commercial ASM3P2872AG-08ST 3P2872AG 8-Pin SOIC, TUBE, Green Commercial ASM3P2872AG-08SR 3P2872AG 8-Pin SOIC, TAPE & REEL, Green Commercial 6-Pin TSOT-23, TAPE & REEL Commercial ASM3P2872A-06OR B1LL ASM3P2872A-08TT 3P2872A 8-Pin TSSOP, TUBE Commercial ASM3P2872A-08TR 3P2872A 8-Pin TSSOP, TAPE & REEL Commercial ASM3P2872A-08ST 3P2872A 8-Pin SOIC, TUBE Commercial ASM3P2872A-08SR 3P2872A 8-Pin SOIC, TAPE & REEL Commercial ASM3I2872AF-06OR B5LL ASM3I2872AF-08TT ASM3I2872AF-08TR 6-Pin TSOT-23, TAPE & REEL, Pb Free Industrial 3I2872AF 8-Pin TSSOP, TUBE, Pb Free Industrial 3I2872AF 8-Pin TSSOP, TAPE & REEL, Pb Free Industrial ASM3I2872AF-08ST 3I2872AF 8-Pin SOIC, TUBE, Pb Free Industrial ASM3I2872AF-08SR 3I2872AF 8-Pin SOIC, TAPE & REEL, Pb Free Industrial ASM3I2872AG-06OR B6LL 6-Pin TSOT-23, TAPE & REEL, Green Industrial ASM3I2872AG-08TT 3I2872AG 8-Pin TSSOP, TUBE, Green Industrial ASM3I2872AG-08TR 3I2872AG 8-Pin TSSOP, TAPE & REEL, Green Industrial ASM3I2872AG-08ST 3I2872AG 8-Pin SOIC, TUBE, Green Industrial ASM3I2872AG-08SR 3I2872AG 8-Pin SOIC, TAPE & REEL, Green Industrial 6-Pin TSOT-23, TAPE & REEL Industrial Industrial ASM3I2872A-06OR B2LL ASM3I2872A-08TT 3I2872A 8-Pin TSSOP, TUBE ASM3I2872A-08TR 3I2872A 8-Pin TSSOP, TAPE & REEL Industrial ASM3I2872A-08ST 3I2872A 8-Pin SOIC, TUBE Industrial ASM3I2872A-08SR 3I2872A 8-Pin SOIC, TAPE & REEL Industrial Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 10 of 12 ASM3P2872A October 2005 rev 1.6 Device Ordering Information A S M 3 P 2 8 7 2 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 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 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 ASM3P2872A October 2005 rev 1.6 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: ASM3P2872A Document Version: v1.6 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. 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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