ICS7152A Spread Spectrum Clock Generator Description Features The ICS7152A-02 and -11 are clock generators for EMI (Electromagnetic Interference) reduction (see below for frequency ranges and multiplier ratios). Spectral peaks are attenuated by modulating the system clock frequency. Down or center spread profiles are selectable. Down spread will not exceed the maximum frequency of an unspread clock, and center spread does not change the average operating frequency of the system • • • • • Operating voltage of 3.3 V ±0.3 V • • • • • Low cycle-to-cycle jitter - less than 100 ps ICS offers many other clocks for computers and computer peripherals. Consult ICS when you need to remove crystals and oscillators from your board. 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 and commercial temperature ranges Available in Pb (lead) free package Pin compatible with Fujitsu MB88152-102 and -111 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 Modulation Type ICS7152AM-02, ICS7152AMI-02 40.0 MHz to 134.0 MHz Down spread ICS7152AM-11, ICS7152AMI-11 16.6 MHz to 67.0 MHz Center spread Yes 1 MDS 7152A A Integrated Circuit Systems, Inc. Modulation Enable Pin ● 525 Race Street, San Jose, CA 95126 Revision 102005 ● tel (408) 297-1201 ● www.icst.com ICS7152A Spread Spectrum Clock Generator Pin Assignment Spread Direction and Percentage Select Table XIN 1 8 XENS XOUT 2 7 GND 3 SEL 4 Spread Direction Spread Percentage (%) Part Number FREQ SEL Pin 4 6 VDD 0 Center ±0.5 ICS7152AM-11 5 CKOUT Down -1.0 ICS7152AM-02 Center ±1.5 ICS7152AM-11 Down -3.0 ICS7152AM-02 1 8 pin (150 mil) SOIC Frequency Select Table Modulation Enable Select Table XENS Pin 8 Modulation 0 Modulation 1 No modulation Frequency FREQ Pin 7 0 1 16.6 to 40 MHz ICS7152AM-11 40 to 80 MHz ICS7152AM-02 33 to 67 MHz ICS7152AM-11 66 to 134 MHz ICS7152AM-02 Pin Descriptions Pin Number Pin Name Pin Type 1 XIN Input 2 XOUT Output Crystal. 3 GND Power Connect to ground. 4 SEL Input Spread modulation select. 5 CKOUT Output Spread modulation select. 6 VDD Power Connect to +3.3 V. 7 FREQ Input Frequency select. 8 XENS Output Crystal/clock input pin. Modulation enable select. 2 MDS 7152A A Integrated Circuit Systems, Inc. Pin Description ● 525 Race Street, San Jose, CA 95126 Revision 102005 ● tel (408) 297-1201 ● www.icst.com ICS7152A Spread Spectrum Clock Generator External Components The ICS7152A requires a minimum number of external components for proper operation. away from the ICS7152A. This includes signal traces just underneath the device, or on layers adjacent to the ground plane layer used by the device. Decoupling Capacitor Crystal Information A decoupling capacitor of 0.01µF must be connected between GND and VDD on pins 3 and 6, as close to these pins 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. 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: 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. PCB Layout Recommendations For optimum device performance and lowest output phase noise, the following guidelines should be observed. 1) The 0.01µF decoupling capacitor should be mounted on the component side of the board as close to the VDD pin as possible. No vias should be used between the decoupling capacitor and VDD pin. The PCB trace to VDD pin should be kept as short as possible, as should the PCB trace to the ground via. 2) To minimize EMI, the 27Ω series termination resistor (if needed) should be placed close to the clock output. 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. Spread Spectrum Profile The ICS7152A 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. Modulation Rate Frequency Series Termination Resistor Crystal caps (pF) = (CL - 6) x 2 Time 3) 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 3 MDS 7152A A Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 102005 ● tel (408) 297-1201 ● www.icst.com ICS7152A Spread Spectrum Clock Generator Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the ICS7152A. 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 -0.5 to 4.0 V 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 7152A A Integrated Circuit Systems, Inc. Typ. ● 525 Race Street, San Jose, CA 95126 Revision 102005 ● tel (408) 297-1201 ● www.icst.com ICS7152A 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 Operating Voltage VDD Supply Current IDD Input High Voltage VIH Input Low Voltage VIL Conditions Min. Typ. Max. Units 3.0 3.3 3.6 V 10 14 mA No load, at 3.3 V, output = 24 MHz 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 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 7152A A Integrated Circuit Systems, Inc. CKOUT, 16.6 to 134 MHz ● 525 Race Street, San Jose, CA 95126 Revision 102005 ● tel (408) 297-1201 ● www.icst.com ICS7152A 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 Oscillation Frequency fX Conditions Min. Max. Units 16.6 40 MHz 40 48 MHz XIN, ICS7152A-11 16.6 67 MHz XIN, ICS7152A-02 40 134 MHz CKOUT, ICS7152A-11 16.6 67 MHz CKOUT, ICS7152A-02 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, load capacitance 15 pF 0.5 TBD 3.0 V/ns TBD 100 ps 5 ms XIN, XOUT, Fundamental oscillation XIN, XOUT, 3rd over tone, note 1 Input Frequency fIN Output Frequency fOUT Input Clock Duty Cycle tDCI Output Clock Duty Cycle tDCC Output Slew Rate Typ. Cycle to Cycle Jitter tJC No load, standard deviation Lock Time tLK CKOUT 2 CKOUT=TBD 33 Modulation Frequency fMOD kHz Note 1: Contact ICS Applications for more information. 6 MDS 7152A A Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 102005 ● tel (408) 297-1201 ● www.icst.com ICS7152A Spread Spectrum Clock Generator Input Frequency (fIN = 1/tIN) tIN 0.8 VDD CKIN 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 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 7152A A Integrated Circuit Systems, Inc. Conditions ● 525 Race Street, San Jose, CA 95126 Revision 102005 ● tel (408) 297-1201 ● www.icst.com ICS7152A 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 Millimeters 8 Symbol E Min A A1 B C D E e H h L α H INDEX AREA 1 2 D 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° *For reference only. Controlling dimensions in mm. A h x 45 A1 C -Ce SEATING PLANE B L .10 (.004) 8 MDS 7152A A Integrated Circuit Systems, Inc. C ● 525 Race Street, San Jose, CA 95126 Revision 102005 ● tel (408) 297-1201 ● www.icst.com ICS7152A Spread Spectrum Clock Generator Ordering Information Part / Order Number Marking Shipping Packaging Package Temperature ICS7152AM-02 ICS7152AM-02T ICS7152AM-02LF ICS7152AM-02LFT ICS7152AMI-02 ICS7152AMI-02T ICS7152AMI-02LF ICS7152AMI-02LFT ICS7152AM-11 ICS7152AM-11T ICS7152AM-11LF ICS7152AM-11LFT ICS7152AMI-11 ICS7152AMI-11T ICS7152AMI-11LF ICS7152AMI-11LFT 7152AM02 7152AM02 152AM02L 152AM02L 152AMI02 152AMI02 52AMI02L 52AMI02L 7152AM11 7152AM11 152AM11L 152AM11L 152AMI11 152AMI11 52AMI11L 52AMI11L 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 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 7152A A Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 102005 ● tel (408) 297-1201 ● www.icst.com ICS7152A Spread Spectrum Clock Generator Revision History Rev. Originator Date A J. Sarma 10/20/05 Description of Change Rev A; new device/datasheet. 10 MDS 7152A A Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 102005 ● tel (408) 297-1201 ● www.icst.com