P1708C June 2004 rev 1.1 Low Power Notebook LCD Panel EMI Reduction IC Features down stream clock and data dependent signals. The FCC approved method of EMI attenuation. P1708C allows significant system cost savings by reducing Generates a low EMI spread spectrum clock of the the number of circuit board layers ferrite beads, shielding input frequency. and other passive components that are traditionally Optimized for frequency range from 50 to 110MHz. required to pass EMI regulations. Internal loop filter minimizes external components and board space. The P1708C modulates the output of a single PLL in order Four selectable spread ranges. to “spread” the bandwidth of a synthesized clock, and more Low inherent cycle-to-cycle jitter. importantly, 3.3V operating voltage range. harmonics. This results in significantly lower system EMI TTL or CMOS compatible inputs and outputs. compared to the typical narrow band signal produced by Ultra-low power CMOS design. oscillators and most frequency generators. Lowering EMI decreases the peak amplitudes of its 8.46 mA @3.3V, 54MHz by increasing a signal’s bandwidth is called ‘spread 9.79 mA @3.3V, 65MHz spectrum clock generation’. 12.06 mA @3.3V, 81MHz 16.51 mA @3.3V, 108MHz The P1708C uses the most efficient and optimized Supports notebook VGA and other LCD timing modulation controller applications. implemented in a proprietary all digital method. profile approved by the FCC and is Pinout compatible to ICS MK1708 and Cypress CY25560. SSON/SBM pin for Spread Spectrum On/Off and Applications Standby Mode controls. Available in 8-pin SOIC and TSSOP. The P1708C is targeted towards notebook LCD displays, and other displays using an LVDS interface, PC peripheral Product Description The P1708C is a versatile spread spectrum frequency devices, and embedded systems. modulator designed specifically for input clock frequencies. The P1708C reduces electromagnetic interference (EMI) at the clock source, allowing system wide reduction of EMI of VDD SR0 Block Diagram SR1 SSON PLL Modulation CLKIN 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. P1708C June 2004 rev 1.1 Pin Configuration CLKIN 1 VDD 2 VSS ModOUT 8 NC 7 SR0 3 6 SR1 4 5 SSON/SBM P1708C Pin Description Pin# Pin Name Type Description 1 CLKIN I 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 5) low. Refer Standby Mode Selection Table. 2 VDD P Connect to +3.3V. 3 VSS P Ground Connection. Connect to system ground. 4 ModOUT O Spread spectrum clock output. 5 SSON/SBM I 6 SR1 I 7 SR0 I 8 NC - Spread Spectrum On/Off and standby mode control. Refer Standby Mode Selection Table. This pin has an internal pull-up resistor. Digital logic input used to select Spreading Range. Refer Spread Spectrum Selection Table. This pin has an internal pull-up resistor. Digital logic input used to select Spreading Range. Refer Spread Spectrum Selection Table. This pin has an internal pull-up resistor. No connect. Low Power Notebook LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 2 of 10 P1708C June 2004 rev 1.1 Standby Mode Selection CLKIN SSON/SBM Disabled 0 Spread Spectrum N/A Disabled 1 Enabled Enabled ModOUT PLL Mode Disabled Disabled Standby N/A Disabled Free Running Free Running 0 Off Reference Disabled Buffer out 1 On Normal Normal Normal Spread Range Selection SR1 SR0 Spreading Range Modulation Rate 0 0 ± 1.00% (FIN/40) * 62.49 KHz 0 1 ± 2.00% (FIN/40) * 62.49 KHz 1 0 ± 0.25% (FIN/40) * 62.49 KHz 1 1 ± 0.75% (FIN/40) * 62.49 KHz Low Power Notebook LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 3 of 10 P1708C June 2004 rev 1.1 Schematic for Notebook VGA Application 50MHz to 110MHz pixel clock input from VGA chip 1 P1708C NC CLKIN 8 Pin 8 can be tied either high or low, or it can be left unconnected. 2 VDD SR0 7 3 VSS SR1 6 Tie SR0 and SR1 high/low according to spread range desired. External resistors are not needed to pull these pins high. 4 ModOUT SSON 5 0.1µF FB VDD Pin 5 SSON should be left unconnected to turn on spread spectrum. Pull this pin low to turn spread spectrum OFF and enable stand-by mode. 50MHz – 110MHz Pixel Clock Input from VGA Chip Note: To set the P1708C to standby mode, disable the input clock (pin 1 CLKIN) and pull SSON (pin 5) low. Refer Standby Mode Selection Table. Low Power Notebook LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 4 of 10 P1708C June 2004 rev 1.1 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 and SSON/SBM) - - -35 µA IIH Input high current - - 35 µA IXOL XOUT output low current @ 0.4V, VDD = 3.3V - 3 - mA IXOH XOUT output high current @ 2.5V, VDD = 3.3V - 3 - mA 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 10pF loading 7.90 9.79 17.53 fIN -max mA IDD Static supply current standby mode - 0.6 - mA VDD Operating voltage 2.7 3.3 3.7 V tON Power up time (first locked clock cycle after power up) - 0.18 - mS ZOUT Clock output impedance - 50 - Ω Low Power Notebook LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 5 of 10 P1708C June 2004 rev 1.1 AC Electrical Characteristics Symbol Parameter Min Typ Max Unit fIN Input frequency 50 - 110 MHz fOUT Output frequency Output rise time Measured at 0.8V to 2.0V Output fall time Measured at 0.8V to 2.0V Jitter (cycle to cycle) 50 - 110 MHz 0.7 0.9 1.1 ns 0.6 0.8 1.0 ns - - 360 ps 45 50 55 % tLH* tHL* tJC tD Output duty cycle *tLH and tHL are measured into a capacitive load of 15pF Low Power Notebook LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 6 of 10 P1708C June 2004 rev 1.1 Package Information Mechanical Package Outline 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° Note: Controlling dimensions are millimeters SOIC – 0.074 grams unit weight Low Power Notebook LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 7 of 10 P1708C June 2004 rev 1.1 Mechanical Package Outline 8-Pin TSSOP H E D A2 A C θ e A1 L B Dimensions in inches Symbol Min Max A Dimensions in millimeters Min Max 0.047 1.10 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 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° Note: Controlling dimensions are millimeters TSSOP – 0.034 grams unit weight Low Power Notebook LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 8 of 10 P1708C June 2004 rev 1.1 Ordering Codes Part Number Marking Package Type P1708C-08ST P1708C 8-pin SOIC, tube P1708C-08SR P1708C 8-pin SOIC, tape & reel P1708C-08TT P1708C 8-pin TSSOP, tube P1708C-08TR P1708C 8-pin TSSOP, tape and reel P1708CF-08ST P1708CF 8-pin SOIC, tube P1708CF-08SR P1708CF 8-pin SOIC, tape & reel P1708CF-08TT P1708CF 8-pin TSSOP, tube P1708CF-08TR P1708CF 8-pin TSSOP, tape and reel Temperature (°C) Qty per reel 0 to 70 2500 0 to 70 0 to 70 2500 0 to 70 0 to 70 2500 0 to 70 0 to 70 2500 0 to 70 Device Ordering Information P 1 7 0 8 C F - 0 8 X X 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 Pb FREE DEVICE NUMBER Flow: P = Commercial Temperature Range (0°C to 70°C) I = Industrial Temperature Range (-25°C to 85°C) Licensed under US patent #5,488,627, #6,646,463 and #5,631,920. Low Power Notebook LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 9 of 10 P1708C June 2004 rev 1.1 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: P1708C Document Version: v1.1 Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to Alliance Semiconductor, dated 11-11-2003 © 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 Power Notebook LCD Panel EMI Reduction IC Notice: The information in this document is subject to change without notice. 10 of 10