ASM3P2780A September 2005 rev 1.5 Low Power Peak EMI Reducing Solution Features The ASM3P2780A 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 3.3 / 2.5V Supply. Operating current less than 5mA. Low power CMOS design. Input frequency range: 30MHz to 50MHz for 2.5V. The ASM3P2780A 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 : 30MHz to 50MHz for 3.3V. by oscillators and most frequency generators. Lowering Generates a 1X low EMI spread spectrum clock of EMI by increasing a signal’s bandwidth is called ‘spread the input frequency. Frequency deviation: ±0.75% (Typ) @46MHz Input Available in 6 pin TSOT-23, 8 pin SOIC and 8 pin spectrum clock generation’. Frequency. Applications TSSOP Packages. The ASM3P2780A is targeted towards all portable devices with very low power requirements like MP3 Product Description players and digital still cameras. The ASM3P2780A is a versatile spread spectrum range of clock frequencies. The ASM3P2780A reduces Key Specifications Description electromagnetic interference (EMI) at the clock source, Supply voltages VDD = 3.3V / 2.5V allowing system wide reduction of EMI of Cycle-to-Cycle Jitter 200pS (Max) dependent signals. The ASM3P2780A allows significant Output Duty Cycle 45/55% system cost savings by reducing the number of circuit Modulation Rate Equation FIN/1280 board layers ferrite beads, shielding that are traditionally Frequency Deviation ±0.75 (Typ) @ 46MHz frequency modulator designed specifically for a wide all clock Specification required to pass EMI regulations. Block Diagram VDD PD PLL Modulation XIN/CLKIN XOUT Crystal Oscillator Frequency Divider Feedback Divider Phase Detector Loop Filter VCO Output Divider 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 ASM3P2780A September 2005 rev 1.5 Pin Configuration (6-pin TSOT- 23 Package) PD 1 XOUT 2 ASM3P2780A XIN / CLKIN 3 6 VSS 5 ModOUT 4 VDD Pin Description Pin# 1 2 Pin Name PD XOUT Type I Description Power-down control pin. Pull low to enable power-down mode. Connect to VDD if not used. 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 ASM3P2780A September 2005 rev 1.5 Pin Configuration (8-pin SOIC and TSSOP Packages) XIN / CLKIN 1 XOUT 2 ASM3P2780A 8 VDD 7 NC PD 3 6 ModOUT NC 4 5 VSS Pin Description Pin# Pin Name Type 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. I Power-down control pin. Pull low to enable power-down mode. Connect to VDD if not used. 3 PD Description 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 Specification For 2.5V Supply For 3.3V Supply 30MHz < CLKIN < 50MHz Modulation Equation FIN/1280 Frequency Deviation ±0.75% (Typ) @ 46MHz Low Power Peak EMI Reducing Solution Notice: The information in this document is subject to change without notice. 3 of 12 ASM3P2780A September 2005 rev 1.5 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 150 °C 2 KV 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 Min Typ Max Unit VIL Input low voltage Parameter 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 (@0.6V, 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 = 8mA) - - 0.6 V VOH Output high voltage (VDD = 2.5 V, IOH = 8mA) 1.8 - - V IDD Static supply current* - - 10 uA ICC Dynamic supply current (2.5V, 46MHz and no load) VDD Operating Voltage tON ZOUT - 4.0 - mA 2.375 2.5 2.625 V Power-up time (first locked cycle after power-up)** - - 5 mS Output impedance - 50 - Ω * XIN /CLKIN pin and PD pin are pulled low ** VDD and XIN/CLKIN input are stable, PD pin is made high from low. AC Electrical Characteristics for 2.5V Supply Symbol Parameter Min Typ Max Unit CLKIN Input frequency 30 - 50 MHz ModOUT Output frequency tLH* 30 0.7 ± 1.10 ± 0.65 1.3 50 1.6 MHz Input Frequency = 30MHz Frequency Deviation Input Frequency = 50MHz Output rise time (measured from 0.7V to 1.7V) tHL* Output fall time (measured from 1.7V to 0.7V) 0.4 0.8 1.0 nS tJC Jitter (cycle to cycle) - - 200 pS tD Output duty cycle 45 50 55 % fd % nS * 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 ASM3P2780A September 2005 rev 1.5 DC Electrical Characteristics for 3.3V 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 (@0.4V, 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 = 8mA) - - 0.4 V VOH Output high voltage (VDD = 3.3 V, IOH = 8mA) 2.5 - - V IDD Static supply current* - - 10 uA ICC Dynamic supply current (3.3V, 46MHz and no load) VDD Operating Voltage tON ZOUT - 5.0 - mA 2.7 3.3 3.6 V Power-up time (first locked cycle after power-up)** - - 5 mS Output impedance - 45 - Ω * XIN /CLKIN pin and PD pin are pulled low ** VDD and XIN/CLKIN input are stable, PD pin is made high from low. AC Electrical Characteristics for 3.3V Supply Symbol Parameter CLKIN Input frequency ModOUT Output frequency Input Frequency = 30MHz Input Frequency = 50MHz Min Typ Max Unit 30 - 50 MHz 30 - 50 MHz - ±1.10 ± 0.65 - % fd Frequency Deviation tLH* Output rise time (measured from 0.8 to 2.0V) 0.5 1.1 1.4 nS tHL * Output fall time (measured at 2.0V to 0.8V) 0.3 0.8 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 ASM3P2780A September 2005 rev 1.5 Typical Crystal Oscillator Circuit R1 = 510Ω Crystal C1 = 27 pF C2 = 27 pF Typical Crystal Specifications Fundamental AT cut parallel resonant crystal Nominal frequency 33MHz Frequency tolerance ± 50ppm 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 ASM3P2780A September 2005 rev 1.5 Package Information 6-pin TSOT-23 Package Dimensions Symbol Millimeters Inches Min Max A 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 ASM3P2780A September 2005 rev 1.5 8-Pin SOIC Package H E D A2 A C D θ e A1 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 ASM3P2780A September 2005 rev 1.5 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 ASM3P2780A September 2005 rev 1.5 Ordering Information Marking Package Type Temperature ASM3P2780AF-06OR Part Number G4LL 6-Pin TSOT-23, TAPE & REEL, Pb Free Commercial ASM3P2780AF-08TT 3P2780AF 8-Pin TSSOP, TUBE, Pb Free Commercial ASM3P2780AF-08TR 3P2780AF 8-Pin TSSOP, TAPE & REEL, Pb Free Commercial ASM3P2780AF-08ST 3P2780AF 8-Pin SOIC, TUBE, Pb Free Commercial ASM3P2780AF-08SR 3P2780AF ASM3P2780AG-06OR G3LL ASM3P2780AG-08TT 8-Pin SOIC, TAPE & REEL, Pb Free Commercial 6-Pin TSOT-23, TAPE & REEL, Green Commercial 3P2780AG 8-Pin TSSOP, TUBE, Green Commercial ASM3P2780AG-08TR 3P2780AG 8-Pin TSSOP, TAPE & REEL, Green Commercial ASM3P2780AG-08ST 3P2780AG 8-Pin SOIC, TUBE, Green Commercial ASM3P2780AG-08SR 3P2780AG 8-Pin SOIC, TAPE & REEL, Green Commercial 6-Pin TSOT-23, TAPE & REEL Commercial ASM3P2780A-06OR G1LL ASM3P2780A-08TT 3P2780A 8-Pin TSSOP, TUBE Commercial ASM3P2780A-08TR 3P2780A 8-Pin TSSOP, TAPE & REEL Commercial ASM3P2780A-08ST 3P2780A 8-Pin SOIC, TUBE Commercial ASM3P2780A-08SR 3P2780A 8-Pin SOIC, TAPE & REEL Commercial ASM3I2780AF-06OR G5LL ASM3I2780AF-08TT 6-Pin TSOT-23, TAPE & REEL, Pb Free Industrial 3I2780AF 8-Pin TSSOP, TUBE, Pb Free Industrial ASM3I2780AF-08TR 3I2780AF 8-Pin TSSOP, TAPE & REEL, Pb Free Industrial ASM3I2780AF-08ST 3I2780AF 8-Pin SOIC, TUBE, Pb Free Industrial ASM3I2780AF-08SR 3I2780AF 8-Pin SOIC, TAPE & REEL, Pb Free Industrial ASM3I2780AG-06OR G6LL 6-Pin TSOT-23, TAPE & REEL, Green Industrial ASM3I2780AG-08TT 3I2780AG 8-Pin TSSOP, TUBE, Green Industrial ASM3I2780AG-08TR 3I2780AG 8-Pin TSSOP, TAPE & REEL, Green Industrial ASM3I2780AG-08ST 3I2780AG 8-Pin SOIC, TUBE, Green Industrial ASM3I2780AG-08SR 3I2780AG 8-Pin SOIC, TAPE & REEL, Green Industrial 6-Pin TSOT-23, TAPE & REEL Industrial Industrial ASM3I2780A-06OR G2LL ASM3I2780A-08TT 3I2780A 8-Pin TSSOP, TUBE ASM3I2780A-08TR 3I2780A 8-Pin TSSOP, TAPE & REEL Industrial ASM3I2780A-08ST 3I2780A 8-Pin SOIC, TUBE Industrial ASM3I2780A-08SR 3I2780A 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 ASM3P2780A September 2005 rev 1.5 Device Ordering Information A S M 3 P 2 7 8 0 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 ASM3P2780A September 2005 rev 1.5 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: ASM3P2780A Document Version: v1.5 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. 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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