ICS525-04 OSCaRTM User Configurable PECL Clock Description Features The ICS525-04 OSCaRTM is the most flexible way to generate a high quality, high frequency differential PECL clock output from a crystal or CMOS clock input. The name OSCaRTM stands for Oscillator Replacement, as it is designed to replace crystal oscillators in almost any electronic system. Users can easily configure the device to produce nearly any output frequency from any input frequency by grounding or floating the select pins. Neither microcontroller, software, nor device programmer are needed to set the frequency. Using Phase Locked Loop techniques, the device accepts a crystal or clock to produce output clocks up to 156 MHz at 3.3V, keeping them frequency locked together. • Packaged as 28 pin SSOP (150 mil body) • Highly accurate frequency generation • User determines the output frequency by setting all For simple multipliers to produce common frequencies, refer to the LOCOTM family of parts, which are smaller and more cost effective. This product is intended for clock generation. It has low output jitter (variation in the output period), but input to output skew and jitter are not defined nor guaranteed. For applications which require defined input to output timing, use the ICS527-02. • • • • • • • • • • • • • internal dividers Eliminates need for custom oscillators No software needed Pull-ups on select inputs Input crystal frequency of 5 - 27 MHz Input clock frequency of 2 - 50 MHz Output clock frequencies up to 156 MHz at 3.3V Output clock frequencies up to 200 MHz at 5V Very low jitter PECL levels set by external resistors Operating voltage of 3.3V or 5V Ideal for oscillator replacement Industrial temperature version available Advanced, low power CMOS process 2 VDD Block Diagram 560Ω VDD 82Ω X1/ICLK Crystal or clock input VDD RES Reference Divider Crystal Oscillator PECL Phase Comparator, Charge Pump, and Loop Filter VCO 820Ω Output Divider X2 GND VDD 82Ω VCO Divider Optional crystal capacitors PECL 820Ω 7 R6:R0 2 GND 3 S2:S0 GND 1 MDS 525-04 B Integrated Circuit Systems, Inc. 9 V8:V0 ● 525 Race Street, San Jose, CA 95126 Revision 091802 ● tel (408) 295-9800 ● www.icst.com ICS525-04 OSCaRTM User Configurable PECL Clock Pin Assignment R5 1 28 R6 2 27 R3 S0 3 26 R2 R4 S1 4 25 R1 S2 5 24 R0 VDD 6 23 VDD X1/ICLK 7 22 PECL X2 8 21 PECL GND 9 20 GND V0 10 19 RES V1 11 18 V8 V2 12 17 V7 V3 13 16 V6 V4 14 15 V5 28 pin 150 mil body SSOP Maximum Output Frequency and Output Divider Table S2 S1 S0 CLK Output Pin 5 Pin 4 Pin 3 Divider Max Output Frequency (MHz) VDD = 5V VDD = 3.3V 0 - 70 °C -40 - 85 °C 0 - 70 °C -40 - 85 °C 0 0 0 6 45 44 27 26 0 0 1 2 120 117 81 77 0 1 0 8 34 33 20 19 0 1 1 4 68 66 40 38 1 0 0 5 54 53 32 31 1 0 1 7 39 38 23 22 1 1 0 1 200 195 162 154 1 1 1 3 90 89 54 51 2 MDS 525-04 B Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 091802 ● tel (408) 295-9800 ● www.icst.com ICS525-04 OSCaRTM User Configurable PECL Clock Pin Descriptions Pin Number Pin Name Pin Type 1 R5 Input Reference divider word input pins determined by user. Forms a binary number from 0 to 127. Internal pull-up. 2 R6 Input Reference divider word input pins determined by user. Forms a binary number from 0 to 127. Internal pull-up. 3 S0 Input Select pins for output divider determined by user. See table above. Internal pull-up. 4 S1 Input Select pins for output divider determined by user. See table above. Internal pull-up. 5 S2 Input Select pins for output divider determined by user. See table above. Internal pull-up. 6 VDD Power Connect to VDD. 7 X1/ICLK Input Crystal connection. Connect to a parallel resonant crystal or input clock. 8 X2 Input Crystal connection. Connect to a crystal or leave unconnected for clock. 9 GND Power Connect to ground. 10 - 18 V0 - V8 Input VCO divider word input pins determined by user. Forms a binary number from 0 to 511. Internal pull-up. 19 RES Input Bias resistor input. Connect a resistor between this pin and VDD. 20 GND Power Connect to ground. 21 PECL Output Complementary PECL output. Connect resistor load to this pin. 22 PECL Output PECL output. Connect resistor load to this pin. 23 VDD Power Connect to VDD. 24 R0 Input Reference divider word input pins determined by user. Forms a binary number from 0 to 127. Internal pull-up. 25 R1 Input Reference divider word input pins determined by user. Forms a binary number from 0 to 127. Internal pull-up. 26 R2 Input Reference divider word input pins determined by user. Forms a binary number from 0 to 127. Internal pull-up. 27 R3 Input Reference divider word input pins determined by user. Forms a binary number from 0 to 127. Internal pull-up. 28 R4 Input Reference divider word input pins determined by user. Forms a binary number from 0 to 127. Internal pull-up. Pin Description 3 MDS 525-04 B Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 091802 ● tel (408) 295-9800 ● www.icst.com ICS525-04 OSCaRTM User Configurable PECL Clock External Components Observe the restrictions on allowed values of VDW and RDW. Decoupling Capacitors The output of the ICS525-04 can be determined by the following simple equation: As with any high performance mixed-signal IC, the ICS525-04 must be isolated from system power supply noise to perform optimally. Decoupling capacitors of 0.01µF must be connected between each VDD and the GND, one on each side of the chip.The capacitor must be connected close to the device to minimize lead inductance. No external power supply filtering is required for this device. External Resistors A 560Ω resistor must be connected between RES (pin 19) and VDD. A total of four resistors are needed for the PECL outputs as shown on the block diagram on page 1. The value of these resistors are shown, but can be varied to change the differential pair output swing and the common mode voltage. Consult application note MAN09 for more information. Where: Reference Divider Word (RDW) = 0 to 127 VCO Divider Word (VDW) = 0 to 511 Output Divider (OD) = values on page 2 Also, the following operating ranges should be observed: VDW + 8 10M < Input Frequency x ----------------------------- < 200M ( 5V )or162M ( 3.3v ) ) ( RDW + 2 ) InputFrequency 200kHz < ----------------------------------------------( RDW + 2 ) Crystal Load Capacitors The total on-chip capacitance for a crystal is approximately 16 pF, so a parallel resonant, fundamental mode crystal with this value of load (correlation) capacitance should be used. For crystals with a specified load capacitance greater than 16 pF, crystal capacitors may be connected from each of the pins X1 and X2 to Ground as shown in the block diagram. The value (in pF) of these crystal caps should be (CL - 16)*2, where CL is the crystal load capacitance. These external capacitors are only required for applications where the exact frequency is critical. For a clock input, connect to X1 and leave X2 unconnected (no capacitors on either). Determining the Output Frequency Users have full control in setting the desired output frequency over the range shown in the table on page 2. To replace a standard oscillator, users should connect the divider select input pins directly to ground (or VDD, although this is not required because of internal pull-ups) during Printed Circuit Board layout. The ICS525-04 will automatically produce the correct clock when all components are soldered. It is also possible to connect the inputs to parallel I/O ports to switch frequencies. By choosing divides carefully, the number of inputs which need to be changed can be minimized. See table on page 2 for full details of maximum output. The dividers are expressed as integers. For example, if a 66.66 MHz output on CLK1 is desired from a 14.31818 MHz input, the VCO divider word (VDW) should be 276, with an output divide (OD) of 2. In this example, R6:R0 is 0111011, V8:V0 is 100010100 and S2:S0 is 001. Since all of these inputs have pull-up resistors, it is only necessary to ground the zero pins, namely V7, V6, V5, V3, V1, V0, R6, R2, S2, and S1. To determine the best combination of VCO, reference, and output divide, use the ICS525 Calculator on our web site: www.icst.com. The online form is easy to use and quickly shows you up to three options for these settings. Alternately, you may send an e-mail to [email protected]. 4 MDS 525-04 B Integrated Circuit Systems, Inc. VDW + 8 PECL Frequency = Input Frequency × --------------------------------------------( RDW + 2 ) • OD ● 525 Race Street, San Jose, CA 95126 Revision 091802 ● tel (408) 295-9800 ● www.icst.com ICS525-04 OSCaRTM User Configurable PECL Clock Absolute Maximum Ratings Stresses above the ratings listed below can cause permanent damage to the ICS525-04. 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 -0.5V to VDD+0.5V Ambient Operating Temperature -40 to +85°C Storage Temperature -65 to +150°C Junction Temperature 175°C Soldering Temperature 260°C Recommended Operation Conditions Parameter Min. Typ. Max. Units Ambient Operating Temperature, ICS525R-04 0 +70 °C Ambient Operating Temperature, ICS525R-04I -40 +85 °C Power Supply Voltage (measured in respect to GND) +3.0 +5.5 V DC Electrical Characteristics Unless stated otherwise, VDD = 3.3V ±10%, Ambient Temperature 0 to +70°C Parameter Symbol Operating Voltage VDD Supply Current IDD Conditions Typ. Max. Units 5.5 V 3.0 15 MHz in, 60MHz out, no load 34 mA 15MHz in, 60MHz out, VDD = 5V 60 mA Input High Voltage VIH Input Low Voltage VIL Input High Voltage VIH X1/ICLK only Input Low Voltage VIL X1/ICLK only Output High Voltage VOH IOH = -12 mA 2 V 0.8 VDD/2+1 VDD/2 VDD/2 ● 525 Race Street, San Jose, CA 95126 V V VDD/2-1 2.4 V V 5 MDS 525-04 B Integrated Circuit Systems, Inc. Min. Revision 091802 ● tel (408) 295-9800 ● www.icst.com ICS525-04 OSCaRTM User Configurable PECL Clock Parameter Symbol Conditions Min. Typ. Max. Units 0.4 V Output Low Voltage VOL IOL = 12 mA Input Capacitance CIN V, R, S select pins 5 pF On-chip pull-up resistor RPU V, R, S select pins 270 kΩ AC Electrical Characteristics Unless stated otherwise, VDD = 3.3V ±5%, Ambient Temperature -40 to +85° C Parameter Symbol Input Frequency FIN Output Frequency with OD=2, VDD=4.5 to 5 FOUT Output Frequency with OD=2, VDD=3.0 to 3.3 FOUT Absolute Clock Period Jitter tja One sigma Clock Period Jitter tjs Min. Typ. ● Max. Units Crystal input 5 27 MHz Clock input 2 50 MHz 0 to +70°C 1 120 MHz -40 to +85°C 1 117 MHz 0 to +70°C 1 81 MHz -40 to +85°C 1 77 MHz Deviation from mean ± 50 ps 20 ps 6 MDS 525-04 B Integrated Circuit Systems, Inc. Conditions 525 Race Street, San Jose, CA 95126 Revision 091802 ● tel (408) 295-9800 ● www.icst.com ICS525-04 OSCaRTM User Configurable PECL Clock Package Outline and Package Dimensions (28 pin SSOP, 150 mil Body, 0.025 mm Pitch) Package dimensions are kept current with JEDEC Publication No. 95, MO-153 Millimeters 28 Symbol E1 E INDEX AREA 1 2 D A 2 Min A A1 A2 b C D E E1 e L α aaa Inches Max Min 1.35 1.75 0.10 0.25 -1.50 0.20 0.30 0.18 0.25 9.80 10.00 5.80 6.20 3.80 4.00 0.635 Basic 0.40 1.27 0° 8° -0.10 Max .053 .069 .0040 .010 -.059 .008 .012 .007 .010 .386 .394 .228 .244 .150 .157 0.025 Basic .016 .050 0° 8° -0.004 A A 1 c -Ce SEATING PLANE b L aaa C Ordering Information Part / Order Number Marking Shipping packaging Package Temperature ICS525R-04 ICS525R-04 Tubes 28 pin SSOP 0 to +70°C ICS525R-04T ICS525R-04 Tape and Reel 28 pin SSOP 0 to +70°C ICS525R-04I ICS525R-04I Tubes 28 pin SSOP -40 to +85°C ICS525R-04IT ICS525R-04I Tape and Reel 28 pin SSOP -40 to +85°C 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 7 MDS 525-04 B Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 Revision 091802 ● tel (408) 295-9800 ● www.icst.com