P2005A/S October 2003 rev 1.0 Low Frequency EMI Reduction IC Features deviations ranging form ±0.6% to ±3.0%. Refer FCC approved method of EMI attenuation. Frequency Deviation Selections Table. The P2005X Provides up to 15dB of EMI suppression. reduces electromagnetic interference (EMI) at the clock Generates a 1X or ½ X low EMI spread spectrum source, allowing system wide reduction of EMI of down clock of the input frequency. stream clock and data dependent signals. The P2005X Input frequency range: 8MHz to 32MHz. allows significant system cost savings by reducing the Internal loop filter minimizes external components number of circuit board layers ferrite beads, and board space. and other passive components that are traditionally Frequency deviation: required to pass EMI regulations. o P2005A: ± 1% to ± 3% o P2005S: ± 0.6% to ± 1.8% shielding The P2005X uses the most efficient and optimized SSON# control pin for spread spectrum enable modulation profile approved by the FCC and is and disable options. implemented in a proprietary all digital method. Low cycle-to-cycle jitter. 3.3V or 5V operating voltage range. The P2005X modulates the output of a single PLL in 16mA output drives. order to “spread” the bandwidth of a synthesized clock, TTL or CMOS compatible outputs. and more importantly, decreases the peak amplitudes of Ultra-low power CMOS design. its harmonics. This results in significantly lower system Available in 8-pin SOIC and TSSOP. EMI compared to the typical narrow band signal produced by oscillators and most frequency generators. Lowering Product Description EMI by increasing a signal’s bandwidth is called ‘spread The P2005X is a versatile spread spectrum frequency modulator designed frequencies from specifically 8MHz to for 32MHz. input Refer spectrum clock generation’. clock Output Frequency Selection Table. The P2005X can generate an EMI reduced clock from crystal, ceramic resonator, or system clock. The P2005X offers various percentage Applications The P2005X is targeted towards EMI management for high-speed digital applications such as PC peripheral devices, consumer electronics and embedded controller systems. SR0 SSON# Block Diagram VDD DIV2 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. P2005X October 2003 rev 1.0 Pin Configuration XIN /CLK 1 8 VDD XOUT 2 7 ModOUT 3 6 SSON# 4 5 SR0 P2005X DIV2 VSS Pin Description 1 Pin Name XIN/CLK 2 Pin# Type Description I Connect to crystal or clock. XOUT O 3 DIV2 I 4 VSS P 5 SR0 I 6 SSON# I 7 ModOUT O 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. 8 VDD P Power supply for the entire chip (+3.3V or 5.0V) Output Frequency Selections Input Frequency DIV2 8 MHz 12 MHz 16 MHz 20 MHz 24 MHz 28 MHz 32 MHz 0 (1/2 X) 4 MHz 6 MHz 8 MHz 10 MHz 12 MHz 14 MHz 16 MHz 1 (1X) 8 MHz 12 MHz 16 MHz 20 MHz 24 MHz 28 MHz 32 MHz Output Frequency Frequency Deviation Selections as a Function of Input Frequency P/N P2005A P2005S SR0 Input Frequency Range 8 MHz 12 MHz 16 MHz 20 MHz 24 MHz 28 MHz 32 MHz 0 ± 3.0% ± 2.5% ± 2.0% ± 1.8% ± 1.5% ± 1.5% ± 1.3% 1 ± 2.5% ± 2.0% ± 1.8% ± 1.5% ± 1.3% ± 1.3% ± 1.0% 0 ± 1.8% ± 1.5% ± 1.2% ± 1.1% ± 0.9% ± 0.9% ± 0.8% 1 ± 1.5% ± 1.2% ± 1.1% ± 0.9% ± 0.8% ± 0.8% ± 0.6% General purpose EMI Reduction IC Notice: The information in this document is subject to change without notice. Modulation Rate (KHz) (XIN/20) * 62.5 2 of 10 P2005X October 2003 rev 1.0 Spread Spectrum 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 8 2 XOUT MODOUT 7 3 DIV2 SSON# 6 4 VSS SR0 5 0.1µF 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 P2005X October 2003 rev 1.0 EMC Software Simulation By using Alliance’s proprietary EMC simulation software – EMI-Lator®, 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 ®. Simulation results From EMI-Lator® General purpose EMI Reduction IC Notice: The information in this document is subject to change without notice. 4 of 10 P2005X October 2003 rev 1.0 Absolute Maximum Ratings Symbol VDD, VIN Parameter Voltage on any pin with respect to GND Rating Unit -0.5 to + 7.0 V TSTG Storage temperature -65 to +125 °C TA Operating temperature 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 Parameter Min Typ Max Unit VIL Input low voltage GND – 0.3 - 0.8 V VIH Input high voltage 2.0 - VDD + 0.3 V IIL Input low current (pull-up resistors on inputs SR0, SR1, CP0 and CP1) - - -35 µA IIH Input high current (pull-down resistor on input SSON#) - - 35 µA IXOL XOUT Output Low Current (@ 0.4V, VDD = 3.3V) - 3 - mA IXOH XOUT Output High Current (@ 2.5V, VDD = 3.3V) VOL Output low voltage (VDD = 3.3V, IOL = 20mA) - - 0.4 V VOH Output high voltage (VDD = 3.3V, IOH = 20mA) 2.5 - - V ICC Dynamic supply current normal mode (3.3V, and 15pF loading) 6.0 7.0 8.3 mA IDD Static supply current standby mode - 0.6 - mA VDD Operating voltage 3.1 3.3 5.5 V tON Power up time (first locked clock cycle after power up) - 0.18 - mS ZOUT Clock output impedance - 50 - Ω 3 General purpose EMI Reduction IC Notice: The information in this document is subject to change without notice. 5 of 10 P2005X October 2003 rev 1.0 AC Electrical Characteristics Symbol Parameter Min Typ Max Unit fIN Input frequency 8 - 32 MHz fOUT Output frequency 4 - 32 MHz tLH* Output rise time (measured at 0.8V to 2.0V) 0.7 0.9 1.1 ns tHL* Output fall time (measured at 2.0V to 0.8V) 0.6 0.8 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 General purpose EMI Reduction IC Notice: The information in this document is subject to change without notice. 6 of 10 P2005X October 2003 rev 1.0 Package Information 8-Pin SOIC H E D A2 A C A1 D θ e 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 θ 0° 8° 0° 8° General purpose EMI Reduction IC Notice: The information in this document is subject to change without notice. 7 of 10 P2005X October 2003 rev 1.0 8-Pin TSSOP H E D A2 A C θ 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 θ 0° 8° 0° 8° General purpose EMI Reduction IC Notice: The information in this document is subject to change without notice. 8 of 10 P2005X October 2003 rev 1.0 Ordering Codes Part Number Marking Package type P2005X-08ST P2005X 8 PIN SOIC, TUBE P2005X-08SR P2005X 8-PIN SOIC, TAPE AND REEL P2005X-08TT P2005X 8-PIN TSSOP, TUBE P2005X-08TR P2005X 8-PIN TSSOP, TAPE AND REEL General purpose EMI Reduction IC Notice: The information in this document is subject to change without notice. Qty/reel Temperature 0°C To 70°C 2,500 0°C To 70°C 0°C To 70°C 2,500 0°C To 70°C 9 of 10 P2005X October 2003 rev 1.0 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 © Alliance Semiconductor All Rights Reserved Preliminary Information Part Number: P2005X Document Version: v1.0 © 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