ASM3P2814AF-08SR

ASM3P2811A/B and ASM3P2812A/B and ASM3P2814A/B Low Power EMI Reduction IC Features • FCC approved method of EMI attenuation • Provides up to 15dB EMI reduction • Generates a 1x, 2x and 4x low EMI spread spectrum clock of the input frequency o 1x: ASM3P2811A/B o 2x: ASM3P2812A/B o 4x: ASM3P2814A/B • Optimized for input frequency range from 10MHz to 40MHz • Internal loop filter minimizes external components and board space • Selectable spread options: o Down Spread and Center Spread • 8 frequency deviation selections: o ±0.625% to -3.5% • Low inherent Cycle-to-Cycle Jitter • 3.3V Operating Voltage • CMOS/TTL compatible inputs and outputs. • Pin-out compatible with Cypress CY25811, CY25812 and CY25814 • Available in 8-pin SOIC and TSSOP Packages combinations of spread options and percentage deviations. Refer to Frequency Deviation and Spread Selection Table. These combinations include Down and Center Spread, and percentage deviation range from ±0.625% to -3.5%. The ASM3P28XX reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of downstream clock and data dependent signals. The ASM3P28XX allows significant system cost savings by reducing the number of circuit board layers, ferrite beads, shielding, and other passive components that are traditionally required to pass EMI regulations. The ASM3P28XX 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’. The ASM3P28XX uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all-digital method. Product Description The ASM3P28XX devices are versatile spread spectrum frequency modulators designed specifically for a wide range of input clock frequencies from 10MHz to 40MHz. Refer to Input/Output Frequency Range Selection Table. The ASM3P28XX can generate an EMI reduced clock from crystal, ceramic resonator, or system clock. The ASM3P28XX-A and the ASM3P28XX-B offer various ©2010 SCILLC. All rights reserved. OCTOBER 2010 – Rev. 2.1 Applications The ASM3P28XX is targeted towards EMI management for memory and LVDS interfaces in mobile graphic chipsets and high-speed digital applications such as PC peripheral devices, consumer electronics, and embedded controller systems. Publication Order Number: ASM3P2811/D ASM3P2811A/B and ASM3P2812A/B and ASM3P2814A/B Block Diagram VDD D_C SRS FRS PLL Modulation XIN / CLKIN Crystal Oscillator Frequency Divider XOUT Feedback Divide r Phase Detector Loop Filter VCO Output Divider ModOUT VSS Pin Configuration XIN / CLKIN 1 VSS 2 D_C 3 ASM3P2811A/B ASM3P2812A/B ASM3P2814A/B SRS 4 8 XOUT 7 VDD 6 FRS 5 ModOUT Pin Description Pin# Pin Name Type Description 1 XIN / CLKIN I Crystal connection or external Clock input. 2 VSS P Ground to entire chip. 3 D_C I 4 SRS I 5 ModOUT O Spread spectrum clock output. 6 FRS I Frequency range select. Digital logic input used to select Input frequency range (Refer to Input/Output Frequency Range Selection Table). This pin has an internal pull-up resistor. 7 VDD P Power supply for the entire chip. 8 XOUT O Crystal connection. If using an external reference, this pin must be left unconnected. Digital logic input used to select Down (LOW) or Center (HIGH) spread options. (Refer to Frequency Deviation and Spread Selection Table). This pin has an internal pull-up resistor. Spread range select. Digital logic input used to select frequency deviation (Refer to Frequency Deviation and Spread Selection Table). This pin has an internal pull-up resistor. . Rev. 2 | Page 2 of 7 | www.onsemi.com ASM3P2811A/B and ASM3P2812A/B and ASM3P2814A/B Input/Output Frequency Range Selection Table Part Number FRS (pin 6) ASM3P2811 (1x) ASM3P2812 (2x) ASM3P2814 (4x) Modulation Rate Input (MHz) Output (MHz) Input (MHz) Output (MHz) Input (MHz) Output (MHz) 0 10-20 10-20 10-20 20-40 10-20 40-80 Input Frequency / 448 1 20-40 20-40 20-40 40-80 20-40 80-160 Input Frequency / 896 Output Frequency Deviation and Spread Selection Table 1 Frequency Deviation (%) Part Number ASM3P28XXA ASM3P28XXB D_C (pin 3) SRS (pin 4) FS=0 FS=1 10/20/40 (MHz) 20/40/80 (MHz) 20/40/80 (MHz) 40/80/160 (MHz) 0 0 -3 -2.5 -2.7 -2.6 0 1 -3.7 -3.4 -3.8 -3.6 1 0 ±1.5 ±1.2 ±1.5 ±1.3 1 1 ±1.8 ±1.6 ±1.9 ±1.8 0 0 -1.7 -1.0 -1.5 -1.4 0 1 -2.0 -1.5 -2.0 -1.9 1 0 ±0.75 ±0.6 ±0.8 ±0.7 1 1 ±1.0 ±0.75 ±1.0 ±0.9 Note: 1. Frequency Deviation given in the table is for the Output Frequency Range covering ASM3P2811x / 12x / 14x. Absolute Maximum Ratings Symbol VDD, VIN TSTG Parameter Rating Unit Voltage on any pin with respect to Ground -0.5 to +4.6 V Storage temperature -65 to +125 °C Ts Max. Soldering Temperature (10 sec) 260 °C TJ Junction Temperature 150 °C TDV Static Discharge Voltage(As per JEDEC STD 22- A114-B) 2 KV 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. . Rev. 2 | Page 3 of 7 | www.onsemi.com ASM3P2811A/B and ASM3P2812A/B and ASM3P2814A/B Operating Conditions Symbol Min Max Unit Supply Voltage 3.0 3.6 V TA Operating temperature -40 +85 °C CL Load Capacitance 10 pF CIN Input Capacitance 7 pF Max Unit VSS – 0.3 0.8 V 2 VDD + 0.3 V -50 µA 50 µA 3 mA 3 mA 0.4 V VDD Parameter DC Electrical Characteristics Symbol Parameter Min VIL Input low voltage VIH Input high voltage Input low current (Inputs D_C, SRS and FRS are pulled high internally) IIL IIH Typ Input high current IXOL IXOH XOUT Output low current (VXOL@ 0.4V, VDD = 3.3V) XOUT Output high current (VXOH@ 2.5V, VDD = 3.3V) VOL Output low voltage (VDD = 3.3V, IOL = 5mA) VOH Output high voltage (VDD = 3.3V, IOH = -5mA) ICC Dynamic supply current (Unloaded Output) IDD Static supply current , Standby mode (CLKIN pulled to GND) VDD tON ZOUT Operating voltage 2.5 V 8 3.0 3.3 Power up time (first locked clock cycle after power up) Clock out impedance 18 mA 4.5 mA 3.6 V 500 µS 76 Ω AC Electrical Characteristics Symbol fIN fOUT 1 tLH tHL 1 Parameter Min Typ Max Unit Input frequency for ASM3P2811/12/13/14 A/B 10 40 MHz Output frequency for ASM3P2811A/B 10 40 MHz Output frequency for ASM3P2812A/B 20 80 MHz Output frequency for ASM3P2814A/B 40 160 MHz Output rise time (measured at 0.8V to 2.0V) 0.5 0.9 1.2 nS Output fall time (measured at 2.0V to 0.8V) 0.8 1.0 1.3 nS tJC Cycle-to-Cycle Jitter (Unloaded Output) tD Output duty cycle ±250 45 Note: 1. tLH and tHL are measured into a capacitive load of 10pF . Rev. 2 | Page 4 of 7 | www.onsemi.com 50 pS 55 % ASM3P2811A/B and ASM3P2812A/B and ASM3P2814A/B Package Information 8-Pin SOIC Package H E D A2 A θ C D 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 θ 0° 8° 0.41 1.27 0° 8° Note: Controlling dimensions are millimeters. SOIC: 0.074 grams unit weight. . Rev. 2 | Page 5 of 7 | www.onsemi.com ASM3P2811A/B and ASM3P2812A/B and ASM3P2814A/B 8-lead TSSOP (4.40-MM Body) H E D A2 A θ e C 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 θ 0° 8° 0.50 0.70 0° 8° . Rev. 2 | Page 6 of 7 | www.onsemi.com ASM3P2811A/B and ASM3P2812A/B and ASM3P2814A/B Ordering Code Part Number Marking Package Type Temperature ASM3P2811AF-08SR ACH 8-Pin SOIC, Tape & Reel, Pb free 0°C to 70°C ASM3P2811BF-08SR ACJ 8-Pin SOIC, Tape & Reel, Pb free 0°C to 70°C ASM3P2812AF-08SR ACL 8-Pin SOIC, Tape & Reel, Pb free 0°C to 70°C ASM3P2812AF-08TR ACL 8-Pin TSSOP, Tape & Reel, Pb free 0°C to 70°C ASM3P2812BF-08SR ACN 8-Pin SOIC, Tape & Reel, Pb free 0°C to 70°C ASM3P2814AF-08SR ACP 8-Pin SOIC, Tape & Reel, Pb free 0°C to 70°C ASM3P2814BF-08TR ACR 8-Pin TSSOP, Tape & Reel, Pb free 0°C to 70°C A “microdot” placed at the end of last row of marking or just below the last row toward the center of package indicates Pb-free are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes ON Semiconductor and without further notice to any products herein. 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