ICS411 PC PERIPHERAL CLOCK Description Features The ICS411 is a cost-effective clock synthesizer developed to optimize component count for PC motherboard and peripheral applications. The device supports a common, low cost 14.31818 MHz crystal. The device locks all output frequencies to enhance system performance. By supporting common PC peripheral interface frequencies including 25 MHz for Ethernet and 24.576 MHz for audio and other applications, the device lowers chip count enhancing system cost and reliability. • • • • • • • • • Low operating voltage of 3.3 V Accepts 14.31818 MHz clock input to lower jitter Fixed dual 25 MHz clocks for Ethernet Fixed 24.576 MHz clock Power consumption of 15 mA (typ) extends battery life Duty cycle of 45 to 55% (24.576M) Packaged in 8-pin SOIC Available in Pb (lead) free package Contact ICS for custom frequency requirements The ICS411 utilizes a low pin count 8-pin SOIC package to optimize board space. ICS is a leader in low jitter and power consumer application clock sources. These devices are capable of supporting CCD, video, audio, USB, CPU, and other peripherals. Block Diagram VDD 2 4 .5 7 6 M IC L K 1 4 .3 1 8 1 8 M H z 25M PLL 25M 2 GND 1 MDS 411 C In te grated Circui t Systems l 5 25 Race Stre et, San Jose, CA 9 5126 Revision 062005 l te l (4 08) 297 -1201 l w w w. i c s t . c o m ICS411 PC PERIPHERAL CLOCK Pin Assignment 8 7 6 GND GND 1 2 3 24. 576 M 4 5 2 5M I CLK VDD VDD 25M 8 Pi n (150 mi l ) SOI C Pin Descriptions Pin Number 1 2 3 4 5 6 7 8 Pin Name Pin Type ICLK VDD GND 24.576M 25M 25M GND VDD Input Power Power Output Output Output Power Power Clock connection. Connect to 14.31818 MHz clock. Connect to voltage supply. Connect to ground. 24.576 MHz clock output. 25 MHz clock output. 25 MHz clock output. Connect to ground. Connect to voltage supply. 2 MDS 411 C Integrated Ci rcu it Systems Pin Description l 525 Ra ce St reet, San Jose , CA 9512 6 Revision 062005 l tel (408 ) 29 7-120 1 l w w w. i c s t . c o m ICS411 PC PERIPHERAL CLOCK External Components PCB Layout Recommendations Series Termination Resistor For optimum device performance and lowest output phase noise, the following guidelines should be observed. Clock output traces over one inch should use series termination. To series terminate a 50Ω trace (a commonly used trace impedance), place a 33Ω resistor in series with the clock line, as close to the clock output pin as possible. The nominal impedance of the clock output is 20Ω. Decoupling Capacitor 1) 0.01µF decoupling capacitors should be mounted on the component side of the board as close to the VDD pin as possible. No vias should be used between 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 33Ω series termination resistor, if needed, should be placed close to the clock output. As with any high performance mixed-signal IC, the ICS411 must be isolated from system power supply noise to perform optimally. Decoupling capacitors of 0.01µF must be connected between each VDD pin and the PCB ground plane. 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 away from the ICS411. This includes signal traces just underneath the device, or on layers adjacent to the ground plane layer used by the device. Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the ICS411. 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 -0.5 V to VDD+0.5 V Ambient Operating Temperature 0 to +70 °C Storage Temperature -65 to +150 °C Junction Temperature 125°C Soldering Temperature 260°C Recommended Operation Conditions Parameter Ambient Operating Temperature Power Supply Voltage (measured in respect to GND) Typ. Max. Units 0 – +70 °C +3.60 V +3.00 3 MDS 411 C Integrated Ci rcu it Systems Min. l 525 Ra ce St reet, San Jose , CA 9512 6 Revision 062005 l tel (408 ) 29 7-120 1 l w w w. i c s t . c o m ICS411 PC PERIPHERAL CLOCK DC Electrical Characteristics VDD=3.3 V ±10% Notes: 1. Nominal switching threshold is VDD/2 Parameter Symbol Conditions Min. Typ. Max. Units 3.6 V Operating Voltage VDD 3.0 Input High Voltage VIH Note 1 Input Low Voltage VIL Note 1 Output High Voltage VOH IOH = -25 mA Output Low Voltage VOL IOL = 25 mA Operating Supply Current IDD No load 8 mA Short Circuit Current IOS Each output 80 mA 2.0 V 0.8 2.4 V V 0.8 V AC Electrical Characteristics VDD = 3.3 V ±10%, Ambient Temperature 0 to +70° C Parameter Symbol Conditions Min. Input Frequency Typ. Max. Units 14.318 MHz Output Rise Time tOR 0.8 to 2.0 V, CL=15 pF 0.60 ns Output Fall Time tOF 2.0 to 0.8 V, CL=15 pF 0.60 ns Output Clock Duty Cycle At VDD/2, 24.576M Absolute Jitter, Short Term Variation from mean, 24.576M 150 ps Absolute Jitter, Short Term Variation from mean, 25M 115 ps 50 55 4 MDS 411 C Integrated Ci rcu it Systems 45 l 525 Ra ce St reet, San Jose , CA 9512 6 % Revision 062005 l tel (408 ) 29 7-120 1 l w w w. i c s t . c o m ICS411 PC PERIPHERAL CLOCK Package Outline and Package Dimensions (8-pin SOIC, 150 Mil. Narrow Body) Package dimensions are kept current with JEDEC Publication No. 95 Millimeters Symbol Min Max Min Max A 1.35 1.75 .0532 .0688 A1 0.10 0.25 .0040 .0098 B 0.33 0.51 .013 .020 C 0.19 0.25 .0075 .0098 D 4.80 5.00 .1890 .1968 E 3.80 4.00 .1497 .1574 8 E H INDEX AREA Inches* e 1.27 BASIC 0.050 BASIC H 5.80 6.20 .2284 .2440 h 0.25 0.50 .010 .020 L 0.40 1.27 .016 .050 α 0° 8° 0° 8° 1 2 D *For reference only. Controlling dimensions in mm. A h x 45 A1 C -Ce SEATING PLANE B L .10 (.004) C Ordering Information Part / Order Number Marking Shipping Packaging Package Temperature ICS411M ICS411MT ICS411MLF ICS411MLFT ICS411 ICS411 ICS411LF ICS411LF Tubes Tape and Reel Tubes Tape and Reel 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 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. 5 MDS 411 C Integrated Ci rcu it Systems l 525 Ra ce St reet, San Jose , CA 9512 6 Revision 062005 l tel (408 ) 29 7-120 1 l w w w. i c s t . c o m