ICS7152 Spread Spectrum Clock Generator Description Features The ICS7152-01, -02, -11, and -12 are clock generators for EMI (Electro Magnetic Interference) reduction (see below for frequency ranges and multiplier ratios). Spectral peaks can be attenuated by slightly modulating the oscillation frequency. Both down and center spread profiles are selectable. Center spread maintains an average frequency equal to an unspread clock. Down spread meets maximum frequency specs over the entire modualtion cycle. • • • • • Operating voltage of 3.3 V ±0.3 V Packaged in 8-pin SOIC Input frequency range of 16.6 to 134.0 MHz Output frequency range of 16.6 to 134.0 MHz Provides a spread spectrum clock output (±0.5%, ±1.5% center spread; -1.0%, -3.0% down spread) • Advanced, low-power CMOS process • Industrial temperature range available • Available in Pb (lead) free package Block Diagram VDD SEL PLL Clock Synthesis and Spread Spectrum Circuitry FREQ XENS XIN CKOUT Clock Buffer/ Crystal Ocsillator XOUT External caps required with crystal for accurate tuning of the clock GND Product Lineup Product Input Frequency Range ICS7152M-01, ICS7152MI-01 16.6 MHz to 67 MHz ICS7152M-02, ICS7152MI-02 40.0 MHz to 134.0 MHz ICS7152M-11, ICS7152MI-11 16.6 MHz to 67.0 MHz ICS7152M-12, ICS7152MI-12 40.0 MHz to 134.0 MHz Modulation Enable Pin Down spread Yes Center spread 1 MDS 7152 E Integrated Circuit Systems, Inc. Modulation Type ● 525 Race Street, San Jose, CA 95126 Revision 012306 ● tel (408) 297-1201 ● www.icst.com ICS7152 Spread Spectrum Clock Generator Pin Assignment SEL Modulation Rate Setting Table XIN 1 8 XENS XOUT 2 7 FREQ GND 3 6 VDD SEL 4 5 CKOUT SEL Pin 4 (note1) Spread Direction Spread Percentage (%) Part Number 0 Center ±0.5 Down -1.0 Center ±1.5 Down -3.0 ICS7152M-11, ICS7152M-12 ICS7152M-01, ICS7152M-02 ICS7152M-11, ICS7152M-12 ICS7152M-01, ICS7152M-02 1 8 pin (150 mil) SOIC Modulation Enable Setting Table XENS Pin 8 Spread Spectrum 0 ON 1 OFF Frequency Setting Table Frequency FREQ Pin 7 0 16.6 to 40 MHz 40 to 80 MHz 1 33 to 67 MHz 66 to 134 MHz ICS7152M-01, ICS7152M-11 ICS7152M-02, ICS7152M-12 ICS7152M-01, ICS7152M-11 ICS7152M-02, ICS7152M-12 Pin Descriptions Pin Number Pin Name Pin Type 1 XIN Input 2 XOUT Output Crystal resonator connection pin. 3 GND Power Connect to ground. 4 SEL Input Modulation rate setting pin. 5 CKOUT Output Modulated clock output pin. 6 VDD Power Connect to +3.3 V. 7 FREQ Input Frequency setting pin. 8 XENS Output Crystal resonator connection pin/clock input pin. Modulation enable setting pin. 2 MDS 7152 E Integrated Circuit Systems, Inc. Pin Description ● 525 Race Street, San Jose, CA 95126 Revision 012306 ● tel (408) 297-1201 ● www.icst.com ICS7152 Spread Spectrum Clock Generator External Components Crystal Information The ICS7152 requires a minimum number of external components for proper operation. Decoupling Capacitor The crystal used should be a fundamental mode, parallel resonant. Crystal capacitors should be connected from pins X1 to ground and X2 to ground to optimize the initial accuracy. The value of these capacitors is given by the following equation: A decoupling capacitor of 0.01µF must be connected between GND and VDD on pin 6, as close to this pin as possible. For optimum device performance, the decoupling capacitor should be mounted on the component side of the PCB. Avoid the use of vias in the decoupling circuit. In the equation, CL is the crystal load capacitance. So, for a crystal with a 16 pF load capacitance, two 20 pF [(16-6) x 2] capacitors should be used. Series Termination Resistor Spread Spectrum Profile Series termination should be used on the clock output. To series terminate a 50Ω trace (a commonly used trace impedance) place a 27Ω resistor in series with the clock line, as close to the clock output pin as possible. The nominal impedance of the clock output is 25Ω. The ICS7152 low EMI clock generator uses a triangular frequency modulation profile for optimal down stream tracking of zero delay buffers and other PLL devices. The frequency modulation amplitude is constant with variations of the input frequency. Crystal caps (pF) = (CL - 6) x 2 PCB Layout Recommendations For optimum device performance and lowest output phase noise, the following guidelines should be observed. 1) An optimum layout is one with all components on the same side of the board, minimizing vias through other signal layers. Other signal traces should be routed away from the ICS7152. This includes signal traces just underneath the device, or on layers adjacent to the ground plane layer used by the device. Time 3 MDS 7152 E Integrated Circuit Systems, Inc. Frequency Modulation Rate ● 525 Race Street, San Jose, CA 95126 Revision 012306 ● tel (408) 297-1201 ● www.icst.com ICS7152 Spread Spectrum Clock Generator Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the ICS7152. These ratings, which are standard values for ICS commercially rated parts, are stress ratings only. Functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods can affect product reliability. Electrical parameters are guaranteed only over the recommended operating temperature range. Item Rating Supply Voltage, VDD 7V All Inputs and Outputs (referenced to GND) -0.5 V to VDD+0.5 V Ambient Operating Temperature -40 to +85°C Storage Temperature -55 to +125°C Junction Temperature -40 to +125°C Soldering Temperature 260°C Overshoot (VIOVER) VDD + 1.0 V (tOVER < 50 ns) max Undershoot (VIUNDER) GND - 1.0 V (tUNDER < 50 ns) min Overshoot/Undershoot tUNDER < 50 ns VIOVER < VDD + 1.0 V VDD Input pin GND VIUNDER < GND - 1.0 V tOVER < 50 ns Recommended Operation Conditions Parameter Min. Ambient Operating Temperature -40 Power Supply Voltage (measured in respect to GND) +3.0 3.3 Max. Units +85 °C 3.6 V 4 MDS 7152 E Integrated Circuit Systems, Inc. Typ. ● 525 Race Street, San Jose, CA 95126 Revision 012306 ● tel (408) 297-1201 ● www.icst.com ICS7152 Spread Spectrum Clock Generator DC Electrical Characteristics Unless stated otherwise, VDD = 3.3 V ±0.3 V, Ambient Temperature -40 to +85°C Parameter Symbol Conditions Min. Typ. Max. Units 3.0 3.3 3.6 V 14 28 mA Operating Voltage VDD Supply Current IDD No load, at 3.3 V Input High Voltage VIH SEL, FREQ, XENS VDD x 0.8 VDD + 0.3 V XIN, Input slew rate 3 V/ns, 16.6 to 100 MHz VDD x 0.8 VDD + 0.3 V XIN, Input slew rate 3 V/ns, 100 to 134 MHz VDD x 0.9 VDD + 0.3 V SEL, FREQ, XENS GND VDD x 0.20 V XIN, Input slew rate 3 V/ns, 16.6 to 100 MHz GND VDD x 0.20 V XIN, Input slew rate 3 V/ns, 100 to 134 MHz GND VDD x 0.10 V Input Low Voltage VIL Output High Voltage VOH CKOUT, IOH = -4 mA VDD - 0.5 VDD V Output Low Voltage VOL CKOUT, IOL = 4 mA GND 0.4 V Input Capacitance CIN XIN, SEL, XENS 16 pF CKOUT, 16.6 to 67 MHz 15 pF CKOUT, 67 to 100 MHz 10 pF CKOUT, 100 to 134 MHz 7 pF Load Capacitance CL Output Impedance ZO Ω 25 5 MDS 7152 E Integrated Circuit Systems, Inc. CKOUT, 16.6 to 134 MHz ● 525 Race Street, San Jose, CA 95126 Revision 012306 ● tel (408) 297-1201 ● www.icst.com ICS7152 Spread Spectrum Clock Generator AC Electrical Characteristics Unless stated otherwise, VDD = 3.3 V ±0.3 V, Ambient Temperature -40 to +85° C Parameter Symbol Conditions Min. Max. Units 16.6 40 MHz ICS7152-01, -11 16.6 67 MHz ICS7152-02, -12 40 134 MHz CKOUT, ICS7152-01, -11 16.6 67 MHz CKOUT, ICS7152-02, -12 40 134 MHz XIN, 16.6 to 100 MHz 40 50 60 % XIN, 100 to 134 MHz 45 50 55 % CKOUT, 1.5 V 40 60 % CKOUT, 0.4 to 2.4 V, CL = 15 pF 0.5 3.0 V/ns No load, spread off, ICS7151-01, -02 150 ps No load, spread off, ICS7151-11, -12 250 ps 5 ms Input Crystal Frequency Input Clock Frequency fIN Output Frequency fOUT Input Clock Duty Cycle tDCI Output Clock Duty Cycle tDCC Output Slew Rate Cycle to Cycle Jitter tJC Power-up Time Modulation Frequency fMOD PLL lock-time from power-up to 1% of final value 2 CKOUT 33 kHz 6 MDS 7152 E Integrated Circuit Systems, Inc. Typ. ● 525 Race Street, San Jose, CA 95126 Revision 012306 ● tel (408) 297-1201 ● www.icst.com ICS7152 Spread Spectrum Clock Generator Input Frequency (fIN = 1/tIN) tIN 0.8 VDD XIN Output Slew Rate 2.4 V 0.4 V CKOUT tr tf SR = (2.4 - 0.4) /tr, SR = (2.4 - 0.4) /tf Thermal Characteristics 8 SOIC Parameter Symbol Thermal Resistance Junction to Ambient Thermal Resistance Junction to Case Min. Typ. Max. Units θJA Still air 150 °C/W θJA 1 m/s air flow 140 °C/W θJA 3 m/s air flow 120 °C/W 40 °C/W θJC 7 MDS 7152 E Integrated Circuit Systems, Inc. Conditions ● 525 Race Street, San Jose, CA 95126 Revision 012306 ● tel (408) 297-1201 ● www.icst.com ICS7152 Spread Spectrum Clock Generator Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Body) Package dimensions are kept current with JEDEC Publication No. 95 8 Millimeters Symbol E Min A A1 B C D E e H h L α H INDEX AREA 1 2 D A Inches Max Min 1.35 1.75 0.10 0.25 0.33 0.51 0.19 0.25 4.80 5.00 3.80 4.00 1.27 BASIC 5.80 6.20 0.25 0.50 0.40 1.27 0° 8° Max .0532 .0688 .0040 .0098 .013 .020 .0075 .0098 .1890 .1968 .1497 .1574 0.050 BASIC .2284 .2440 .010 .020 .016 .050 0° 8° h x 45 A1 C -Ce SEATING PLANE B L .10 (.004) 8 MDS 7152 E Integrated Circuit Systems, Inc. C ● 525 Race Street, San Jose, CA 95126 Revision 012306 ● tel (408) 297-1201 ● www.icst.com ICS7152 Spread Spectrum Clock Generator Ordering Information Part / Order Number Marking Shipping Packaging Package Temperature ICS7152M-01 ICS7152M-01T ICS7152M-01LF ICS7152M-01LFT ICS7152MI-01 ICS7152MI-01T ICS7152MI-01LF ICS7152MI-01LFT ICS7152M-02 ICS7152M-02T ICS7152M-02LF ICS7152M-02LFT ICS7152MI-02 ICS7152MI-02T ICS7152MI-02LF ICS7152MI-02LFT ICS7152M-11 ICS7152M-11T ICS7152M-11LF ICS7152M-11LFT ICS7152MI-11 ICS7152MI-11T ICS7152MI-11LF ICS7152MI-11LFT ICS7152M-12 ICS7152M-12T ICS7152M-12LF ICS7152M-12LFT ICS7152MI-12 ICS7152MI-12T ICS7152MI-12LF ICS7152MI-12LFT 7152M-01 7152M-01 7152M01L 7152M01L 7152MI01 7152MI01 7152I01L 7152I01L 7152M-02 7152M-02 7152M02L 7152M02L 7152MI02 7152MI02 7152I02L 7152I02L 7152M-11 7152M-11 7152M11L 7152M11L 7152MI11 7152MI11 7152I11L 7152I11L 7152M-12 7152M-12 7152M12L 7152M12L 7152MI12 7152MI12 7152I12L 7152I12L Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel Tubes Tape and Reel 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 8-pin SOIC 0 to +70° C 0 to +70° C 0 to +70° C 0 to +70° C -40 to +85° C -40 to +85° C -40 to +85° C -40 to +85° C 0 to +70° C 0 to +70° C 0 to +70° C 0 to +70° C -40 to +85° C -40 to +85° C -40 to +85° C -40 to +85° C 0 to +70° C 0 to +70° C 0 to +70° C 0 to +70° C -40 to +85° C -40 to +85° C -40 to +85° C -40 to +85° C 0 to +70° C 0 to +70° C 0 to +70° C 0 to +70° C -40 to +85° C -40 to +85° C -40 to +85° C -40 to +85° C Parts that are ordered with a "LF" suffix to the part number are the Pb-Free configuration and are RoHS compliant. While the information presented herein has been checked for both accuracy and reliability, Integrated Circuit Systems (ICS) assumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. No other circuits, patents, or licenses are implied. This product is intended for use in normal commercial applications. Any other applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recommended without additional processing by ICS. ICS reserves the right to change any circuitry or specifications without notice. ICS does not authorize or warrant any ICS product for use in life support devices or critical medical instruments. 9 MDS 7152 E Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 012306 ● tel (408) 297-1201 ● www.icst.com