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ICS180M-03T Datasheet(PDF) 3 Page - Integrated Circuit Systems |
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ICS180M-03T Datasheet(HTML) 3 Page - Integrated Circuit Systems |
3 / 6 page LOW EMI CLOCK GENERATOR ICS180-03 MDS 180-03 A 3 Revision 110404 Integrated Circ uit Systems l 52 5 Race Stre et, San Jose, CA 95 126 l te l (4 08) 297 -1 201 l www.icst.com External Components The ICS180-03 requires a minimum number of external components for proper operation. Decoupling Capacitor A decoupling capacitor of 0.01µF must be connected between VDD and GND on pins 6 and 3, 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. Series Termination Resistor When the PCB trace between the clock output and the load is over 1 inch, series termination should be used. To series terminate a 50 Ω trace (a commonly used trace impedance) place a 33 Ω resistor in series with the clock line, as close to the clock output pin as possible. The nominal impedance of the clock output is 20 Ω. value of these capacitors is given by the following equation: 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 33 Ω series termination resistor, if needed, should be placed close to the clock output. 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 ICS180-03. 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 ICS180-03. 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. Recommended Operation Conditions Item Rating Supply Voltage, VDD 7 V 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 Parameter Min. Typ. Max. Units Ambient Operating Temperature 0 +70 °C Power Supply Voltage (measured in respect to GND) +3.135 +5.5 V |
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