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| P R E L I M I N A R Y I N F O R M AT I O N ICS5OSK481 48 MHz Tiny USB Clock Source Description The ICS5OSK481 is a low cost integrated clock synthesizer solution designed for replacing crystals and crystal oscillators. The ICS5OSK481 generates a very accurate 48.00 MHz clock output. Features * 25 MHz clock input * The 48.00 MHz CLK output is USB2.0 reference clock compliant * * * * * * * Output duty cycle 45/55% (worst case) Advanced, low-power CMOS process Industrial temperature range (-40 to +85C) Packaged in 5-pin TSOT 3.3 V supply voltage Pb (lead) free package available Short term C-C Jitter of 100 ps Block Diagram VDD ICLK Clock Buffer PLL CLK GND OE MDS 5OSK481 B Integrated Circuit Systems, Inc. 1 525 Race Street, San Jose, CA 95126 Revision 111805 tel (408) 297-1201 www.icst.com P R E L I M I N A R Y I N F O R M AT I O N ICS5OSK481 48 MHz Tiny USB Clock Source Pin Assignment ICLK GND CLK 1 2 3 4 VDD 5 OE Pin Descriptions Pin Number 1 2 3 4 5 Pin Name ICLK GND CLK VDD OE Pin Type Input Power Output Power Input Pin Description 25 MHz clock input. Connect to a parallel resonant fundamental crystal or input clock. Connect to ground. PLL output clock. Internal pull-down resistor. Connect to 3.3 V. Output Enable pin. Internal pull-up resistor. OE=0 outputs tristate with weak pull-down. External Components Decoupling Capacitor As with any high-performance mixed-signal IC, the ICS5OSK481 must be isolated from system power supply noise to perform optimally. A decoupling capacitor of 0.01F must be connected between each VDD and the PCB ground plane. to the VDD pin as possible. No vias should be used between the decoupling capacitors and VDD pins. The PCB trace to VDD pins should be kept as short as possible, as should the PCB trace to the ground via. 2) To minimize EMI, the 33 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 ICS5OSK481. This includes signal traces just underneath the device, or on layers adjacent to the ground plane layer used by the device. Series Termination Resistor Clock output traces over one inch should use series termination. To series terminate a 50 trace (a commonly used trace impedance), place a 33 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. PCB Layout Recommendations For optimum device performance and lowest output phase noise, the following guidelines should be observed. 1) The 0.01F decoupling capacitors should be mounted on the component side of the board as close MDS 5OSK481 B Integrated Circuit Systems, Inc. 2 525 Race Street, San Jose, CA 95126 Revision 111805 tel (408) 297-1201 www.icst.com P R E L I M I N A R Y I N F O R M AT I O N ICS5OSK481 48 MHz Tiny USB Clock Source Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the ICS5OSK481. 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 Supply Voltage, VDD All Inputs and Outputs Ambient Operating Temperature Storage Temperature Soldering Temperature 7V Rating -0.5 V to VDD+0.5 V -40 to +85C -65 to +150C 260C Recommended Operation Conditions Parameter Ambient Operating Temperature Power Supply Voltage (measured in respect to GND) Min. -40 +3.135 Typ. Max. +85 +3.465 Units C V DC Electrical Characteristics Unless stated otherwise, VDD=3.3 V 5% , Ambient temperature -40 to +85C, CL=15 pF Parameter Operating Voltage Input High Voltage, ICLK only Input Low Voltage, ICLK only Input High Voltage Input Low Voltage Output High Voltage Output Low Voltage IDD Operating Supply Current Short Circuit Current On-Chip Pull-up Resistor Input Capacitance, S1, S0, and OE Nominal Output Impedance Symbol VDD VIH VIL VIH VIL VOH VOL Conditions ICLK ICLK OE OE IOH = -12 mA IOL = 12 mA No load CLK output OE Min. 3.135 (VDD/2)+1 Typ. Max. 3.465 (VDD/2)-1 Units V V V V V V V mA mA k pF 2.0 0.8 2.4 0.4 TBD +70 270 4 20 MDS 5OSK481 B Integrated Circuit Systems, Inc. 3 525 Race Street, San Jose, CA 95126 Revision 111805 tel (408) 297-1201 www.icst.com P R E L I M I N A R Y I N F O R M AT I O N ICS5OSK481 48 MHz Tiny USB Clock Source AC Electrical Characteristics Unless stated otherwise, VDD=3.3 V 5% , Ambient temperature -40 to +85C, CL=15 pF Parameter Input Frequency, clock input Output Frequency, VDD = 3.3 V 5% Output Clock Rise Time Output Clock Fall Time Output Clock Duty Cycle Output Enable Time, OE high to output on Output Disable Time, OE low to tri-state Absolute Clock Period Jitter Note 1: Measured with 15 pF load. Symbol FIN FOUT tOR tOF tOD Conditions -40C to +85C 0.8 to 2.0 V, Note 1 2.0 to 8.0 V, Note 1 1.5 V Min. 0.5 Typ. 25 48 1 1 Max. Units MHz MHz ns ns 45 49-51 50 50 55 % ns ns ps tja Deviation from mean, Note 1 TBD MDS 5OSK481 B Integrated Circuit Systems, Inc. 4 525 Race Street, San Jose, CA 95126 Revision 111805 tel (408) 297-1201 www.icst.com P R E L I M I N A R Y I N F O R M AT I O N ICS5OSK481 48 MHz Tiny USB Clock Source Package Outline and Package Dimensions (5-pin TSOT) Package dimensions are kept current with JEDEC Publication No. 95 Symbol Millimeters Min Max A A1 A2 b c D E E1 e e1 L L1 L2 aaa -- 1.00 0.01 0.10 0.84 0.90 0.30 0.45 0.12 0.20 2.90 BASIC 2.80 BASIC 1.60 BASIC 0.95 BASIC 1.90 BASIC 0.30 0.50 0.60 REF 0.25 BASIC 0 8 -- 0.10 Ordering Information Part / Order Number ICS5OSK481TILF ICS5OSK481TILFT Marking TBD TBD Shipping Packaging Tubes Tape and Reel Package 5-pin TSOT 5-pin TSOT Temperature -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. MDS 5OSK481 B Integrated Circuit Systems, Inc. 5 525 Race Street, San Jose, CA 95126 Revision 111805 tel (408) 297-1201 www.icst.com |
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