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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 ICS5OSK482 48 MHz Tiny USB Clock Source Description The ICS5OSK482 is a low cost integrated clock synthesizer solution designed for replacing crystals and crystal oscillators. The ICS5OSK482 generates a very accurate 48.00 MHz clock output. Features * 25 MHz crystal 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 X1 X2 Crystal Oscillator PLL CLK External capacitors are required with a crystal input. GND MDS 5OSK482 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 ICS5OSK482 48 MHz Tiny USB Clock Source Pin Assignment X1 GND CLK 1 2 3 4 VDD 5 X2 Pin Descriptions Pin Number 1 2 3 4 5 Pin Name X1 GND CLK VDD X2 Pin Type Input Power Output Power Output Connect to ground. PLL output clock. Internal pull-down resistor. Connect to 3.3 V. 25 MHz crystal output. Pin Description 25 MHz crystal input. Connect to a parallel resonant fundamental crystal. External Components External Crystal The ICS5OSK482 requires a 14.31818 MHz crystal. In order to minimize ppm errors, the PCB should include pads for crystal capacitors from pins X1 to ground and X2 to ground to optimize the initial accuracy. The capacitor value can be determined by tuning the PCB so that the error on the reference output is equal to the initial crystal error. Crystal Load Capacitors The device crystal connections should include pads for small capacitors from X1 to ground and from X2 to ground. These capacitors are used to adjust the stray capacitance of the board to match the nominally required crystal load capacitance. Because load capacitance can only be increased in this trimming process, it is important to keep stray capacitance to a minimum by using very short PCB traces (and no vias) been the crystal and device. Crystal capacitors must be connected from each of the pins X1 and X2 to ground. The value (in pF) of these crystal caps should equal (CL -6 pF)*2. In this equation, CL= crystal load capacitance in pF. Example: For a crystal with a 8 pF load capacitance, each crystal capacitor would be 4 pF [(8-6) x 2 = 4]. MDS 5OSK482 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 ICS5OSK482 48 MHz Tiny USB Clock Source Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the ICS5OSK482. 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 0 to +70C, CL=15pF Parameter Operating Voltage 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 Nominal Output Impedance Symbol VDD VIH VIL VOH VOL Conditions OE OE IOH = -12 mA IOL = 12 mA No load CLK output OE Min. 3.135 2.0 Typ. Max. 3.465 0.8 Units V V V V V mA mA k pF 2.4 0.4 TBD +70 270 4 20 MDS 5OSK482 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 ICS5OSK482 48 MHz Tiny USB Clock Source AC Electrical Characteristics Unless stated otherwise, VDD = 3.3 V 5%, Ambient Temperature -40 to +85 C, CL=15pF Parameter Input Frequency, crystal 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. 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 5OSK482 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 ICS5OSK482 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 ICS5OSK482TILF ICS5OSK482TILFT 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 5OSK482 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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