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| November 2003 rev 1.0 P2560B Features FCC approved method of EMI attenuation Generates a low EMI spread spectrum and a nonspread reference signal of frequency Optimized for input frequency range from 20 to 32 MHz Internal loop filter minimizes external components and board space Two selectable spread ranges Low inherent cycle-to-cycle jitter 3.3 V or 5 V operating voltage CMOS/TTL compatible inputs and outputs Ultra low power CMOS design: 5.50 mA @3.3 V Supports notebook VGA and other LCD timing controller applications SSON pin for Spread Spectrum On/Off and Standby Mode controls Available in 8-pin SOIC and TSSOP the input clock (EMI) at the clock source allowing system-wide reduction of EMI of downstream clock and data dependent signals. It allows significant system cost savings by reducing the number of circuit board layers and shielding traditionally required to pass EMI regulations. The P2560B modulates the output of a single PLL in order to spread the bandwidth of a synthesized clock, thereby decreasing 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 clock generators. Lowering EMI by increasing a signal's bandwidth is called spread spectrum clock generation. The P2560B uses the most efficient and optimized modulation profile approved by the FCC and is implemented by using a proprietary all-digital method. Applications Product Description The P2560B is a versatile spread spectrum frequency modulator designed specifically for a wide range of clock frequencies. It reduces electromagnetic interference The P2560B is targeted toward the notebook VGA chip and other displays using an LVDS interface, PC peripheral devices, and embedded systems Block Diagram 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. November 2003 rev 1.0 Pin Configuration P2560B P2560B Standby Mode Selection CLKIN Disabled Disabled Enabled Enabled SSON/SBM 0 1 0 1 Spread Spectrum N/A N/A Off On ModOUT Disabled Disabled Reference Normal PLL Disabled Free running Disabled Normal Mode Standby Free running Buffer out Normal Spread Range Selection, VDD = 3.3 V CLKIN frequency 20 MHz 25 MHz 27 MHz 30 MHz 32 MHz Pin Description Pin# Pin Name 1 2 3 4 5 6 7 8 XIN/CLK XOUT DIV2 VSS SR0 SSON# MODOUT VDD Spreading range 1.16% 1.13% 1.11% 1.0% 1.0% (CLKIN/10) * 20.83 kHz Modulation rate Type I O I P I I O P Description Crystal connection or external reference frequency input. This pin has dual functions. It can be connected to either an external crystal or an external reference clock. Crystal connection. If using an external reference, this pin must be left unconnected. Digital logic input used to select normal output mode or divide-by-2 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. Digital logic input used to select Spreading Range (Refer Spread Deviation 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 low EMI output. Power supply for the entire chip (5V). Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 2 of 7 November 2003 rev 1.0 Schematic for Notebook VGA Application P2560B P2560B Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 3 of 7 November 2003 rev 1.0 Absolute Maximum Ratings Symbol Parameter VDD, VIN Voltage on any pin with respect to GND TSTG TA Storage temperature Operating temperature P2560B Rating -0.5 to +7.0 -65 to +125 0 to +70 Unit V C C DC Electrical Characteristics Symbol Parameter VIL VIH IIL IIH IXOL IXOH VOL VOH IDD ICC VDD tON ZOUT Input low voltage Input high voltage Input low current (pull-up resistor on inputs SR0 and SSON/SBM) Input high current XOUT output low current XOUT output high current Output low voltage Output high voltage at 0.4 V, VDD = 3.3V at 0.4 V, VDD = 5.0 V at 2.5 V, VDD = 3.3 V at 4.5 V, VDD = 5.0 V VDD = 3.3 V, IOL = 20 mA VDD = 5.0 V, IOL = 20 mA VDD = 3.3 V, IOL = 20 mA VDD = 5.0 V, IOL = 20 mA Normal mode: Dynamic supply current Operating voltage Power-up time (first locked cycle after power up) Clock output impedance 3.3 V and 10 pF loading 5.0 V and 10 pF loading Min GND - 0.3 2.0 - - - - - - - - 2.5 4.5 - fIN-min 3.2 6.2 2.7 - - Typ - - - - 3 20 3 20 - - - - 0.6 fIN-typ - - 3.3 0.18 50 Max 0.8 VDD + 0.3 -35 35 - - - - 0.4 - - - - fIN-max 7.0 13.6 5.5 - - Unit V V A A mA mA mA mA V V V V mA mA mA V mS Static supply current standby mode AC Electrical Characteristics Symbol fIN fOUT tLH 1 tHL 1 tJC tD Input frequency Output frequency Output rise time Output fall time Jitter (cycle to cycle) Output duty cycle Parameter Min 20 20 Typ - - 0.9 0.75 0.8 0.75 - 50 Max 32 32 1.1 - 1.0 - 360 55 Unit MHz MHz ns ns ns ns ps % Measured at 0.8 V to 2.0 V Measured at 1.2 V to 3.75 V Measured at 2.0 V to 0.8 V Measured at 1.2 V to 3.75 V 0.7 - 0.6 - - 45 Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 4 of 7 November 2003 rev 1.0 Package Information 8-Pin SOIC SYMBOL MIN A 0.057 0.004 0.053 0.012 0.004 0.186 0.148 0.050 0.224 0.012 0 INCHES NOR 0.064 0.007 0.061 0.016 0.006 0.194 0.156 BSC 0.236 0.020 5 MAX 0.071 0.010 0.069 0.020 0.010 0.202 0.164 1.27 0.248 0.028 8 MIN 1.45 0.10 1.35 0.31 0.10 4.72 3.75 BSC 5.70 0.30 0 P2560B MILLIMETERS NOR 1.63 0.18 1.55 0.41 0.15 4.92 3.95 MAX 1.80 0.25 1.75 0.51 0.25 5.12 4.15 P2560B A1 A2 B C D E e H L a 6.00 0.50 5 6.30 0.70 8 Note: Controlling dimensions are millimeters. SOIC - 0.074 grams unit weight 8-Pin TSSOP SYMBOL MIN A A1 A2 B C D E e H L a - 0.002 0.031 0.007 0.004 0.114 0.169 0.026 0.244 0.018 0 INCHES NOR - - 0.039 - - 0.118 0.173 BSC 0.252 0.024 - MAX 0.047 0.006 0.041 0.012 0.008 0.122 0.177 0.65 0.260 0.030 8 MIN - 0.05 0.80 0.19 0.09 2.90 4.30 BSC 6.20 0.45 0 6.40 0.60 - 6.60 0.75 8 MILLIMETERS NOR - - 1.00 - - 3.00 4.40 MAX 1.10 0.15 1.05 0.30 0.20 3.10 4.50 Note: Controlling dimensions are millimeters. TSSOP - 0.034 grams unit weight Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 5 of 7 November 2003 rev 1.0 Ordering Information P2560B X 2560B X - 08 XX Package: ST: SOIC in TUBE SR: SOIC in TAPE & REEL TT: TSSOP in TUBE TR: TSSOP in TAPE & REEL PIN COUNT F = Pb FREE PART NUMBER Flow: P: Commercial temperature Range (0C to 70C) I: Industrial Temperature Range (-20C to 85C) Examples Ordering Code P2560B-08ST I2560B-08SR P2560BF-08ST I2560BF-08SR Package Type 8-pin 150mil SOIC 8-pin SOIC T&R 8-pin TSSOP Tube 8-pin TSSOP T&R Operating Range Commercial Industrial Commercial Industrial Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 6 of 7 November 2003 rev 1.0 P2560B Licensed under US patent number 5,488,627 and 5,631,920. 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: P2560B 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. Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 7 of 7 |
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