ASM3P2110A November 2003 rev 1.1 electromagnetic interference (EMI) at the clock source. Features The ASM3P2110A allows significant system cost savings Generates an EMI optimized clocking signal at output. Input frequency - 12.75 MHz. Output Frequency - 51 MHz (modulated) Frequency Deviation: 1%. Modulation Rate: 30 KHz. Supply voltage range 3.3V. Available in commercial and industrial temperature ranges. Available in 20-pin 150-mil SSOP package. by reducing the number of circuit board layers and shielding that are required to pass EMI regulations. The ASM3P2110A modulates the output of 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. Product Description The ASM3P2110A is a versatile spread spectrum frequency modulator. The ASM3P2110A reduces Block Diagram VDD XIN XOUT Crystal Oscillator PLL + SS Output Buffer SSON ClockOut (51MHz) REFOUT VSS Alliance Semiconductor 2575 Augustine Drive * Santa Clara CA * Tel: 408-855-4900 * Fax: 408-855-4999 * www.alsc.com ASM3P2110A November 2003 rev 1.1 Pin Configuration X2 1 20 REFOUT X1 2 19 NC 3 18 NC NC 4 17 GND NC 5 16 NC NC 6 15 NC NC 7 14 NC NC 8 13 NC NC 9 12 SSON CLK 10 11 NC ASM3P2110A Pin Description Pin # Pin Name Pin Type 1 X2 O 2 X1 I 3 9, 11, 13-16, 18, 19 10 VDD 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 reference clock. Crystal connection. If using an external reference, this pin must be left unconnected. Power supply to the entire chip. (3.3V) NC - No connection. CLK O 12 SSON I 17 GND P Modulated output (51MHz). Digital logic input used to enable spread spectrum function. (Active HIGH). Spread spectrum is enabled when HIGH, disabled when LOW. This pin has an internal pull-low resistor. Ground connection. 20 REFOUT O Un-modulated reference output clock of the input frequency. Peak Reducing EMI Solution 2 of 8 ASM3P2110A November 2003 rev 1.1 Absolute Maximum Ratings Symbol VDD VI VO IIK IOK TS TA TJ Parameter Rating Unit Supply voltage, DC (GND - 0.5) to 7 V Input voltage, DC (GND-0.5) to (VDD+0.5) V Output voltage, DC (GND-0.5) to (VDD + 0.5) V Input clamp current (VI <0 or VI > VDD) -50 to +50 mA Output clamp current (VI <0 or VI > VDD) -50 to +50 mA Storage temperature -65 to +150 C Ambient temperature range, under bias -25 to +85 C Junction temperature 150 C Lead temperature (soldering 10 sec) 260 C Input static discharge voltage protection 2 kV (MIL -STD 883E, Method 3015.7) Note: These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for extended periods may affect device reliability. Operating Conditions Parameter Supply Voltage Ambient Operating Temperature Range Crystal Resonator Frequency Output Driver Load Capacitance Symbol VDD Condition / Description 3.3V 10% TA Min Typ Max Unit 3 3.3 3.6 V +85 C -20 FXIN 12.75 CL MHz 15 pF Crystal Specifications Fundamental AT cut parallel resonant crystal Nominal frequency 12.75MHz Frequency tolerance 50 ppm or better at 25C Operating temperature range -20C to +85C Storage temperature -40C to +85C Load capacitance 18pF Shunt capacitance 7pF maximum ESR 25 Peak Reducing EMI Solution 3 of 8 ASM3P2110A November 2003 rev 1.1 DC Electrical Characteristics Parameter Supply Current, Dynamic High-Level Input Voltage Low-Level Input Voltage High-Level Input Current Low-Level Input Current (pull-up) High-Level Output Source Current Low-Level Output Source Current Symbol Conditions / Description Overall VDD=3.3V, FCLK=12.75MHz, CL=15pF All input pins Min VIH VDD=3.3V 2.0 VDD+0.3 V VIL VDD=3.3V VSS-0.3 0.8 V IIH -1 1 A IIL -20 -36 -80 A IDD Typ Max 43 Unit mA IxOH VDD=V(XIN) = 3.3V, VO=0V 10 21 30 mA IxOL VDD=3.3V, V(XIN)=VO=5.5V -10 -21 -30 mA Clock Outputs High-Level Output Source Current Low-Level Output Sink Current Output Impedance IOH VO=2.4V -20 mA IOL VO=0.4V 23 mA ZOH ZOL VO=0.5VDD; output driving high Vo=0.5VDD; output driving low 29 27 Peak Reducing EMI Solution 4 of 8 ASM3P2110A November 2003 rev 1.1 AC Electrical Characteristics Parameter Symbol Conditions/ Description Min VO = 0.3V to 3.0V; Rise Time tr CL = 15pF VO = 3.0V to 0.3V; Fall Time tf CL = 15pF Ratio of pulse width (as measured from Clock Duty rising edge to next falling edge at 2.5V) 45 Cycle to one clock period On rising edges 500 s apart at 2.5 V Jitter, Long relative to an ideal clock, PLL B inactive * Tj (LT) Term On rising edges 500 s apart at 2.5 V relative to an ideal clock, PLL B active * From rising edge to next rising edge at 2.5 V, PLL B inactive * Jitter, peak to Tj (T) peak From rising edge to next rising edge at 2.5 V, PLL B active * * CL = 15 pF, Input clock frequency = 12.75 MHz, Output frequency = 51 MHz Peak Reducing EMI Solution Typ Max Unit 2.1 ns 1.9 ns 55 45 % ps 165 110 ps 390 5 of 8 ASM3P2110A November 2003 rev 1.1 Package Information 20-Pin SSOP package H E D A C e A1 D L B Symbol Dimensions in inches Dimensions in millimeters Min Max Min Max A 0.053 0.069 1.35 1.75 A1 0.004 0.010 0.10 0.25 B 0.008 0.012 0.20 0.30 C 0.007 0.010 0.19 0.25 D 0.337 0.344 8.56 8.74 E 0.150 0.157 3.81 3.99 e 0.025 BSC 0.635BSC H 0.228 0.244 5.79 6.20 L 0.016 0.050 0.41 1.27 0 8 0 8 Peak Reducing EMI Solution 6 of 8 ASM3P2110A November 2003 rev 1.1 Ordering Codes Part number Package Configuration Temperature Range ASM3P2110AF-20-JT 20-pin SSOP TUBE Commercial ASM3P2110AF-20-JR 20-pin SSOP TAPE & REEL Commercial ASM3I2110AF-20-JT 20-pin SSOP TUBE Industrial ASM3I2110AF-20-JR 20-pin SSOP TAPE & REEL Industrial Ordering Information A S M 3 P 2 1 1 0 A F - 2 0 - J R OR - SOT23/T/R TT - TSSOP, TUBE TR - TSSOP, T/R QT - QFN, TUBE BT - BGA, TUBE BR - BGA, T/R ST - SOIC, TUBE SR - SOIC, T/R QR - QFN, T/R VT - TVSOP, TUBE VR - TVSOP, T/R JR - SSOP, T/R JT - SSOP, TUBE PIN COUNT Pb FREE PART NUMBER X = Automotive I = Industrial 1 - reserved 2 - Non PLL based 3 - EMI Reduction 4 - DDR support products 5 - STD Zero Delay Buffer P or n/c = Commercial 6 - power management 7 - power management 8 - power management 9 - Hi performance 0 - reserved Alliance Semiconductor Mixed Signal Product Licensed under US patent #5,488,627, #6,646,463 and #5,631,920. Peak Reducing EMI Solution 7 of 8 ASM3P2110A November 2003 rev 1.1 Alliance Semiconductor Corporation 2575, 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: ASM3P2110A Document Version: v1.1 Note: This product utilizes US Patent # 6,646,463 Impedance Emulator Patent issued to Dan Hariton / Alliance Semiconductor, dated 11-11-2003 (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. Peak Reducing EMI Solution 8 of 8