ASM3P2579A August 2004 rev 2.0 Low Power Peak EMI Reducing Solution Features The ASM3P2579A uses the most efficient and optimized modulation profile approved by the FCC and is Generates an EMI optimized clocking signal at the implemented by using a proprietary all digital method. output. Integrated loop filter components. Operates with a 3.3V 0.3V supply. Operating current less than 6mA. Low power CMOS design. Input frequency range: 15MHz to 40MHz. Generates a 1X low EMI spread spectrum clock of The ASM3P2579A 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 the input frequency. by oscillators and most frequency generators. Lowering EMI by increasing a signal's bandwidth is called `spread Spread Spectrum Enable Control. Frequency deviation: 1%. Available in 6-pin TSOT-23, 8-pin SOIC and 8-pin spectrum clock generation'. Applications TSSOP packages. The ASM3P2579A is targeted towards all portable Product Description devices with very low power requirements like MP3 The ASM3P2579A is a versatile spread spectrum players and digital still cameras. frequency modulator designed specifically for a wide range of clock frequencies. The ASM3P2579A reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of all clock Key Specifications Description Specification Supply voltages VDD = 3.3V 0.3V Frequency Range 15MHz < CLKIN < 40MHz board layers ferrite beads, shielding that are traditionally Cycle-to-Cycle Jitter 300 ps (maximum) required to pass EMI regulations. Output Duty Cycle 40/60% (worst case) Output Rise and Fall Time 1.1 ns (maximum) Modulation Rate Equation FIN/640 Frequency Deviation 1% dependent signals. The ASM3P2579A allows significant system cost savings by reducing the number of circuit Block Diagram VDD SSON PLL Modulation XIN Crystal Oscillator XOUT Frequency Divider Feedback Divider Phase Detector Loop Filter VCO Output Divider ModOUT 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. August 2004 ASM3P2579A rev 2.0 Pin Configuration (6-pin TSOT-23) SSON 1 XOUT 2 ASM3P2579A XIN/CLKIN 3 6 VSS 5 ModOUT 4 VDD Pin Description Pin# Pin Name Type Description 1 SSON I When SSON is high, it turns on the spread spectrum feature and when low, it turns off the spread spectrum feature. When Spread Spectrum feature is not required, connect the pin to ground. 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 (3.3V) 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 9 August 2004 ASM3P2579A rev 2.0 Pin Configuration (8-pin SOIC and TSSOP) XIN/CLKIN 1 8 VDD 7 NC 3 6 ModOUT NC 4 5 VSS XOUT 2 ASM3P2579A SSON Pin Description Pin# Pin Name Type 4 NC - 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. When SSON is high, it turns on the spread spectrum feature and when low, it turns off the spread spectrum feature. When Spread Spectrum feature is not required, connect the pin to ground. No connect. 1 XIN/CLKIN I 2 XOUT O 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 (3.3V) 3 SSON I Modulation Profile Specification Description Specification Frequency Range 15MHz < CLKIN < 40MHz Modulation Equation FIN /640 Frequency Deviation 1% Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 3 of 9 August 2004 ASM3P2579A rev 2.0 Absolute Maximum Ratings Symbol Parameter Rating Unit Voltage on any pin with respect to Ground 0.5 to +7.0 V Storage temperature -65 to +125 C Operating temperature TA 0 to 70 C 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. VDD , VIN TSTG DC Electrical Characteristics (Test condition: All parameters are measured at room temperature (25C) unless otherwise stated) Symbol Parameter Min Typ Max Unit VIL Input low voltage GND - 0.3 - 0.8 V VIH IIL IIH Input high voltage Input low current Input high current 2.0 - - - - - VDD + 0.3 -35 35 V A A IXOL IXOH VOL XOUT output low current (@4.0V, VDD =3.3V) XOUT output high current (@2.5V, VDD =3.3V) Output low voltage (VDD = 3.3 V, IOL = 20 mA) - 3 3 - 0.4 mA mA V VOH IDD IPD Output high voltage (VDD = 3.3 V, IOH = 20 mA) Static supply current* Power-down current** Dynamic supply current (3.3V, 40MHz and 15pF loading) Operating voltage Power-up time (first locked cycle after power-up)*** 2.5 - - - - - - 1.5 1.0 V mA A - - 6 mA 3.0 - 3.3 - 3.6 10 V mS 50 - u ICC VDD tON ZOUT Clock output impedance - *XIN/CLKIN pin is pulled low **PD pin is pulled low ***VDD and XIN/CLKIN input are stable, PD pin is made high from low. AC Electrical Characteristics Symbol Parameter Min Typ Max Unit CLKIN Input frequency 15 - 40 MHz ModOUT Output frequency 15 - 40 MHz tLH * Output rise time (measured at 0.8V to 2.0V) 0.5 0.7 1.1 ns tHL * Output fall time (measured at 2.0V to 0.8V) 0.5 0.7 1.0 ns tJC Jitter (cycle to cycle) - - 360 ps 45 50 55 % tD 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 9 August 2004 ASM3P2579A rev 2.0 Package Information 6-pin TSOT-23 b C B e A1 A D A2 H L Symbol Dimensions in millimeters Dimensions in inches Min Max Min Max A - 1.00 - 0.040 A1 0 0.10 0 0.004 A2 0.87 REF 0.034 REF B 1.40 1.80 0.055 0.071 b 0.30 0.50 0.012 0.019 C 2.50 3.00 0.098 0.118 D 2.70 3.10 0.106 0.122 e H 0.95 BSC 0.10 L 0.037 BSC 0.35 0.004 MIN 0.20 0 0.014 MIN 0.008 8 0 8 Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 5 of 9 August 2004 ASM3P2579A rev 2.0 8-Pin SOIC H E D A2 D A e C A1 L B Symbol Dimensions in inches Dimensions in millimeters Min Max Min Max A 0.057 0.071 1.45 1.80 A1 0.004 0.010 0.10 0.25 A2 0.053 0.069 1.35 1.75 B 0.012 0.020 0.31 0.51 C 0.004 0.01 0.10 0.25 D 0.186 0.202 4.72 5.12 E 0.148 0.164 3.75 4.15 e 0.050 BSC 1.27 BSC H 0.224 0.248 5.70 6.30 L 0.012 0.028 0.30 0.70 0 8 0 8 Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 6 of 9 August 2004 ASM3P2579A rev 2.0 8-Pin TSSOP H E D A2 A C e A1 L B Dimensions in inches Symbol Min A 0.047 A1 0.002 0.006 0.05 0.15 A2 0.031 0.041 0.80 1.05 B 0.007 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 Max Dimensions in millimeters Min Max 1.10 0.026 BSC 0.65 BSC H 0.244 0.260 6.20 6.60 L 0.018 0.030 0.45 0.75 0 8 0 8 Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 7 of 9 August 2004 ASM3P2579A rev 2.0 Ordering Information Part Number Marking ASM3P2579AF-06OR A4LL ASM3P2579AF-08TT Package Type Temperature 6-Pin TSOT-23, TAPE & REEL 0C - 70oC ASM3P2579AFT 8-Pin TSSOP, TUBE 0oC - 70oC ASM3P2579AF-08TR ASM3P2579AFT 8-Pin TSSOP, TAPE & REEL 0oC - 70oC ASM3P2579AF-08ST ASM3P2579AFS 8-Pin SOIC, TUBE 0oC - 70oC ASM3P2579AF-08SR ASM3P2579AFS 8-Pin SOIC, TAPE & REEL 0oC - 70oC ASM3P2579A-06OR A1LL 6-Pin TSOT-23, TAPE & REEL 0oC - 70oC ASM3P2579A-08TT ASM3P2579AT 8-Pin TSSOP, TUBE 0oC - 70oC ASM3P2579A-08TR ASM3P2579AT 8-Pin TSSOP, TAPE & REEL 0oC - 70oC ASM3P2579A-08ST ASM3P2579AS 8-Pin SOIC, TUBE 0oC - 70oC ASM3P2579A-08SR ASM3P2579AS 8-Pin SOIC, TAPE & REEL 0oC - 70oC Device Ordering Information A S M 3 P 2 5 7 9 A F - 0 8 T R OR - SOT23/T/R TT - TSSOP, TUBE TR - TSSOP, T/R VT - TVSOP, TUBE VR - TVSOP, T/R ST - SOIC, TUBE SR - SOIC, T/R QR - QFN, T/R QT - QFN, TUBE BT - BGA, TUBE BR - BGA, T/R PIN COUNT LEAD FREE PART PART NUMBER X = Automotive I = Industrial 1 - reserved 2 - Non PLL based 3 - EMI Reduction 4 - DDR support products 5 - STD Zero Delay Buffer P or n/c = Commercial 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. 8 of 9 August 2004 ASM3P2579A rev 2.0 Alliance Semiconductor Corporation 2595, Augustine Drive, Santa Clara, CA 95054 Tel# 408-855-4900 Fax: 408-855-4999 www.alsc.com Copyright y Alliance Semiconductor All Rights Reserved Preliminary Information Part Number: ASM3P2579A Document Version: v 2.0 8_30_2004 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. 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