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| October 2003 rev 1.0 Low-Power Mobile VGA EMI Reduction IC Features FCC approved method of EMI attenuation. Generates a low EMI spread spectrum clock of the input frequency. Optimized for frequency range from: o o P1817A - 20 to 30MHz. Operation P1817B - 10 to 20MHz Operation P1817A/B down stream clock and data dependent signals. The P1817 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 P1817 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 P1817 uses the most efficient and optimized modulation profile approved by the FCC and is implemented in a proprietary all digital method. Internal loop filter minimizes external components and board space. Two selectable spread ranges. Low inherent cycle-to-cycle jitter. 3.3V or 5V operating voltage range. TTL or CMOS compatible outputs. Ultra-low power CMOS design. 3.17mA @3.3V, 10MHz | 6.20mA@5.0V, 10MHz 4.28mA @3.3V, 14MHz | 7.50mA @5.0V, 14MHz 5.50mA @3.3V, 20MHz | 9.50mA @5.0V, 20MHz 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. Applications The P1817 is targeted towards notebook VGA chip and other displays using an LVDS interface, PC peripheral devices, and embedded systems. Product Description The P1817 is a versatile spread spectrum frequency modulator designed specifically for input clock frequencies. The P1817 reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of SR0 SSON Block Diagram VDD Modulation XIN Crystal Oscillator XOUT Frequency Divider Feedback Divider Ref Phase Detector Loop Filter PLL 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 P1817A/B XIN /CLKIN VSS SR0 SSON/SBM 1 2 3 4 8 7 6 5 XOUT VDD REF ModOUT P1817A/B Pin Description Pin# 1 2 3 4 5 6 7 8 Pin Name XIN/CLKIN VSS SR0 SSON/SBM ModOUT REF VDD XOUT Type I P I I O O P O Description Connect to externally generated clock signal. To put the part into standby mode, disable the input clock signal to this pin and pull SSON/SBM (pin 4) low. Refer Standby Mode Selection Table. Ground Connection. Connect to system ground. Digital logic input used to select Spreading Range. Refer Spread Spectrum Selection Table. This pin has an internal pull-up resistor. Spread Spectrum On/Off and standby mode control. Refer Standby Mode Selection Table. Spread spectrum clock output or reference output. Refer Standby Mode Selection Table. Reference output. Connect to +3.3V or 5.0V. Connect to crystal. No connect if externally generated clock signal is used. Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 2 of 10 October 2003 rev 1.0 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 P1817A/B Mode Standby Free Running Buffer out Normal Spread Range Selection, VDD = 5V CLKIN frequency 10 MHz 14.318MHz 15MHz 20MHz SR0 1 0 1 0 1 0 1 0 Spreading Range 1.5% 1.9% 1.36% 1.64% 1.3% 1.5% 0.95% 1.125% (CLKIN/10) * 20.83KHz Modulation Rate Spread Range Selection, VDD = 3.3V CLKIN frequency 10 MHz 14.318MHz 15MHz 20MHz SR0 1 0 1 0 1 0 1 0 Spreading Range 1.5% 1.65% 1.4% 1.7% 1.37% 1.63% 1.1% 1.28% (CLKIN/10) * 20.83KHz Modulation Rate Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 3 of 10 October 2003 rev 1.0 P1817A/B Schematic for Notebook VGA Application 1 2 P1817A/B CLKIN/ XOUT XIN VSS VDD 8 0.1F 7 Ferrite Bead VDD 0 0 VDD 0 0 Use either pull-up or pull-down resistors with 0. VDD 3 SR0 SSON/ SBM REF 6 4 ModOUT 5 10 to 20 MHz and 20 to 32 MHz EMI reduced clock output. Pull pin 4 low to turn Spread Spectrum off and enable Standby Mode1. 1 . To set the P1817 to standby mode, disable the input clock (pin 1 CLKIN), and pull pin 4 SSON/SBM low. Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 4 of 10 October 2003 rev 1.0 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 P1817A/B 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 and SSON/SBM) Input high current (pull-down resistor on input SSON#) XOUT output low current XOUT output high current Output low voltage Output high voltage Dynamic supply current normal mode @ 0.4V, VDD = 3.3V @ 0.4V, VDD = 5.0V @ 2.5V, VDD = 3.3V @ 4.5V, VDD = 5.0V VDD =3.3V, IOL = 20mA VDD =5.0V, IOL = 20mA VDD =3.3V, IOH = 20mA VDD =5.0V, IOH = 20mA Normal Mode 3.3V and 10pF loading 5.0V and 10pF loading Parameter Min GND - 0.3 2.0 2.5 4.5 fIN-min 3.2 6.2 2.7 Typ 3 20 3 20 fIN-typ 0.6 3.3 0.18 50 Max 0.8 VDD + 0.3 -35 35 0.4 fIN-max 7.0 13.6 5.5 mA V mS Unit V V A A mA mA V V mA Static supply current standby mode Operating voltage Power up time (first locked clock cycle after power up) Clock output impedance Low Frequency EMI Reduction 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 Parameter Input frequency (See device type P1817A or P1817B). Output frequency (See device type P1817A or P1817B). Measured at 0.8V to 2.0V Output rise time Measured at 1.2V to 3.75V Measured at 0.8V to 2.0V Output fall time Measured at 1.2V to 3.75V Jitter (cycle to cycle) Min 10 10 0.7 0.6 45 P1817A/B 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 % tD Output duty cycle *tLH and tHL are measured into a capacitive load of 15pF Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 6 of 10 October 2003 rev 1.0 Package Information P1817A/B Mechanical Package Outline 8-Pin SOIC E H D A2 A e B A 1 C L D 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 Note: Controlling dimensions are millimeters SOIC - 0.074 grams unit weight Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 7 of 10 October 2003 rev 1.0 P1817A/B Mechanical Package Outline 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 0.002 0.031 0.007 0.004 0.114 0.169 Min Max 0.047 0.006 0.041 0.012 0.008 0.122 0.177 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 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. 8 of 10 October 2003 rev 1.0 Ordering Codes Input Frequency (MHz) 20-32 20-32 20-32 10-20 Pb Free No Yes No Yes 2500 2500 Qty per reel P1817A/B Part Number P1817A-08ST P1817AF-08ST I1817A-08SR I1817BF-08TR Marking P1817A P1817AF I1817A I1817BF Package Type 8-pin SOIC, tube 8-pin SOIC, tube 8-pin SOIC, tape & reel 8-pin SOIC, tape & reel Temperature (C) 0 to 70 0 to 70 -20 to 85 -20 to 85 Device Ordering Information X1817X X- 08 XX OR - SOT23/T/R TT - TSSOP, TUBE TR - TSSOP, T/R VT - TVSOP, TUBE VR - TVSOP, T/R ST - SOIC, TUBE SR - SOIC, T/R QR - QFN, T/R QT - QFN, TUBE BT - BGA, TUBE BR - BGA, T/R Pin Count F = Pb FREE DEVICE NUMBER Flow: P = Commercial Temperature Range (0C to 70C) I = Industrial Temperature Range (-25C to 85C) Licensed under US patent Nos 5,488,627 and 5,631,920. Preliminary datasheet. Specification subject to change without notice. Low Frequency EMI Reduction Notice: The information in this document is subject to change without notice. 9 of 10 October 2003 rev 1.0 P1817A/B 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: P1817A/B 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. 10 of 10 |
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