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| October 2003 rev 1.0 Low Frequency EMI Reduction IC Features FCC approved method of EMI attenuation. Provides up to 15dB of EMI suppression. Generates a 1X or 1/2 X low EMI spread spectrum clock of the input frequency. Input frequency range: 8MHz to 32MHz. Internal loop filter minimizes external components and board space. Frequency deviation: o o P2005A: 1% to 3% P2005S: 0.6% to 1.8% deviations ranging form 0.6% P2005A/S to 3.0%. Refer Frequency Deviation Selections Table. The P2005X reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of down stream clock and data dependent signals. The P2005X allows significant system cost savings by reducing the number of circuit board layers ferrite beads, required to pass EMI regulations. The P2005X uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method. The P2005X 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'. shielding and other passive components that are traditionally SSON# control pin for spread spectrum enable and disable options. Low cycle-to-cycle jitter. 3.3V or 5V operating voltage range. 16mA output drives. TTL or CMOS compatible outputs. Ultra-low power CMOS design. Available in 8-pin SOIC and TSSOP. Product Description The P2005X is a versatile spread spectrum frequency modulator frequencies designed from specifically to for input Refer clock Output 8MHz 32MHz. Applications The P2005X is targeted towards EMI management for high-speed digital applications such as PC peripheral devices, consumer electronics and embedded controller systems. Frequency Selection Table. The P2005X can generate an EMI reduced clock from crystal, ceramic resonator, or system clock. The P2005X offers various percentage Block Diagram SR0 SSON# VDD DIV2 Modulation XIN Crystal Oscillator XOUT Frequency Divider Feedback Divider PLL 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. October 2003 rev 1.0 Pin Configuration XIN /CLK XOUT DIV2 VSS 1 2 8 7 P2005X VDD ModOUT SSON# SR0 P2005X 3 4 6 5 Pin Description Pin# 1 2 3 4 5 6 7 8 Pin Name XIN/CLK XOUT DIV2 VSS SR0 SSON# ModOUT VDD Type I O I P I I O P Connect to crystal or clock. Crystal output. Digital logic input used to select normal output mode or divide-by-two output mode. When this pin is HIGH, the frequency of the output clock is the same as the input clock frequency. When it is tied low, the output frequency is half the input clock frequency. This pin has an internal pull-up resistor. Ground to entire chip. Connect to system ground. Digital logic input used to select Spreading Range Refer Modulation Output and Spreading Range Selection Table. This pin has an internal pull-up resistor. Digital logic input used to enable Spread Spectrum function (Active LOW). Spread Spectrum function enabled when LOW, disabled when HIGH. This pin has an internal pull-low resistor. Spread spectrum clock output. Power supply for the entire chip (+3.3V or 5.0V) Description Output Frequency Selections Input Frequency DIV2 0 (1/2 X) 1 (1X) 8 MHz 4 MHz 8 MHz 12 MHz 6 MHz 12 MHz 16 MHz 8 MHz 16 MHz 20 MHz 10 MHz 20 MHz 24 MHz 12 MHz 24 MHz 28 MHz 14 MHz 28 MHz 32 MHz 16 MHz 32 MHz Output Frequency Frequency Deviation Selections as a Function of Input Frequency Input Frequency Range 8 MHz 3.0% 2.5% 1.8% 1.5% 12 MHz 2.5% 2.0% 1.5% 1.2% 16 MHz 2.0% 1.8% 1.2% 1.1% 20 MHz 1.8% 1.5% 1.1% 0.9% 24 MHz 1.5% 1.3% 0.9% 0.8% 28 MHz 1.5% 1.3% 0.9% 0.8% 32 MHz 1.3% 1.0% 0.8% 0.6% (XIN/20) * 62.5 Modulation Rate (KHz) P/N P2005A P2005S SR0 0 1 0 1 General purpose EMI Reduction IC Notice: The information in this document is subject to change without notice. 2 of 10 October 2003 rev 1.0 Spread Spectrum P2005X The Output Frequency Selection Table and the Frequency Deviations Selections Table illustrate the two possible spread spectrum options. The optimal setting should minimize system EMI to the fullest without affecting system performance. The spreading is described as a percentage deviation of the center frequency (Note: The center frequency is the frequency of the external reference input on CLKIN, Pin1). Example: The P2005X is designed for communications, digital video and imaging applications. It is not only optimized for operation in the 8MHz - 32MHz range, but its output frequency can be extended down to one half of the input clock frequency using the divide-by-two feature. This feature extends low frequency as low as to 4MHz. Setting Pin 3 low (DIV2 = 0; Divide-by-two mode) sets the output frequency (ModOUT) to half the frequency of the input clock (CLKIN). This is a simple way to generate a spread spectrum modulated low frequency clock when only a higher frequency signal is available. If you want the output frequency to be the same as the input, you can either set DIV2=1 or leave it unconnected. Selecting the P2005X's spread options is a matter of either setting SR0=1 or SR0=0. Setting SR0=0 set as a lower modulation spread, while setting it to 1 introduces a wider spectral spread in the output clock. Refer Modulation output and Spreading Selections Tables. The example given in the figure below shows the device set to the divide-by-two mode (DIV2=0) with a lower spectrum range (SR0=0). The versatility provided by allowing both clock division and spread spectrum on one chip is already proving to be a popular solution among leading system manufacturers. P2005X Application Schematic +3.3V 8.832MHz Crystal 1 CLKIN VDD MODOUT 8 2 XOUT DIV2 VSS 7 0.1F 3 SSON# SR0 6 4 5 Modulated 4.416MHz is connected to CLK input pin of the system P2005X General purpose EMI Reduction IC Notice: The information in this document is subject to change without notice. 3 of 10 October 2003 rev 1.0 EMC Software Simulation P2005X By using Alliance's proprietary EMC simulation software - EMI-Lator(R), radiated system level EMI analysis can be made easier, allowing quantitative measure on the benefits of Alliance's EMI reduction products. The simulation engine of this EMC software has already been characterized to correlate with the electrical characteristics of Alliance EMI reduction ICs. The figure below is an illustration of this simulation result. Please visit our website at www.alsc.com for information on how to obtain a free copy and demonstration of EMI-Lator (R). Simulation results From EMI-Lator(R) General purpose EMI Reduction IC Notice: The information in this document is subject to change without notice. 4 of 10 October 2003 rev 1.0 P2005X Absolute Maximum Ratings Symbol VDD, VIN TSTG TA Parameter Voltage on any pin with respect to GND Storage temperature Operating temperature Rating -0.5 to + 7.0 -65 to +125 Unit V C 0 to 70 C Note: These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for extended periods may affect device reliability. DC Electrical Characteristics Symbol VIL VIH IIL IIH IXOL IXOH VOL VOH ICC IDD VDD tON ZOUT Input low voltage Input high voltage Input low current (pull-up resistors on inputs SR0, SR1, CP0 and CP1) Input high current (pull-down resistor on input SSON#) XOUT Output Low Current (@ 0.4V, VDD = 3.3V) XOUT Output High Current (@ 2.5V, VDD = 3.3V) Output low voltage (VDD = 3.3V, IOL = 20mA) Output high voltage (VDD = 3.3V, IOH = 20mA) Dynamic supply current normal mode (3.3V, and 15pF loading) Static supply current standby mode Operating voltage Power up time (first locked clock cycle after power up) Clock output impedance 2.5 6.0 3.1 Parameter Min GND - 0.3 2.0 Typ 3 3 7.0 0.6 3.3 0.18 50 0.4 8.3 5.5 V V mA mA V mS Max 0.8 VDD + 0.3 -35 35 Unit V V A A mA General purpose EMI Reduction IC Notice: The information in this document is subject to change without notice. 5 of 10 October 2003 rev 1.0 AC Electrical Characteristics Symbol fIN fOUT tLH* tHL* tJC Input frequency Output frequency Output rise time (measured at 0.8V to 2.0V) Output fall time (measured at 2.0V to 0.8V) Jitter (cycle to cycle) Parameter Min 8 4 0.7 0.6 45 P2005X Typ 0.9 0.8 50 Max 32 32 1.1 1.0 360 55 Unit MHz MHz ns ns ps % tD Output duty cycle *tLH and tHL are measured into a capacitive load of 15pF General purpose EMI Reduction IC Notice: The information in this document is subject to change without notice. 6 of 10 October 2003 rev 1.0 Package Information P2005X 8-Pin SOIC E H D A2 A e B A 1 C L Symbol Dimensions in inches Min Max 0.071 0.010 0.069 0.020 0.01 0.202 0.164 Dimensions in millimeters Min 1.45 0.10 1.35 0.31 0.10 4.72 3.75 Max 1.80 0.25 1.75 0.51 0.25 5.12 4.15 1.27 BSC 5.70 0.30 0 6.30 0.70 8 A A1 A2 B C D E e H L 0.057 0.004 0.053 0.012 0.004 0.186 0.148 0.050 BSC 0.224 0.012 0 0.248 0.028 8 General purpose EMI Reduction IC Notice: The information in this document is subject to change without notice. D 7 of 10 October 2003 rev 1.0 P2005X 8-Pin TSSOP H E D A2 A e B A1 L C Dimensions in inches Symbol A A1 A2 B C D E e H L Min 0.047 0.002 0.031 0.007 0.004 0.114 0.169 0.006 0.041 0.012 0.008 0.122 0.177 Max Dimensions in millimeters Min Max 1.10 0.05 0.80 0.19 0.09 2.90 4.30 0.65 BSC 6.20 0.45 0 6.60 0.75 8 0.15 1.05 0.30 0.20 3.10 4.50 0.026 BSC 0.244 0.018 0 0.260 0.030 8 General purpose EMI Reduction IC Notice: The information in this document is subject to change without notice. 8 of 10 October 2003 rev 1.0 Ordering Codes Part Number P2005X-08ST P2005X-08SR P2005X-08TT P2005X-08TR Marking P2005X P2005X P2005X P2005X Package type 8 PIN SOIC, TUBE 8-PIN SOIC, TAPE AND REEL 8-PIN TSSOP, TUBE 8-PIN TSSOP, TAPE AND REEL 2,500 2,500 Qty/reel P2005X Temperature 0C To 70C 0C To 70C 0C To 70C 0C To 70C General purpose EMI Reduction IC Notice: The information in this document is subject to change without notice. 9 of 10 October 2003 rev 1.0 P2005X Licensed under U.S Patent Nos 5,488,627 and 5,631,921 Alliance Semiconductor Corporation 2595, Augustine Drive, Santa Clara, CA 95054 Tel# 408-855-4900 Fax: 408-855-4999 www.alsc.com Copyright (c) Alliance Semiconductor All Rights Reserved Preliminary Information Part Number: P2005X Document Version: v1.0 (c) 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. General purpose EMI Reduction IC Notice: The information in this document is subject to change without notice. 10 of 10 |
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