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