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| PI6C3420A 27 MHz Spread Spectrum Clock Synthesizer Product Features * Two High Precision outputs: --27.000 MHz ssc clock output --27.000 MHz clock output * Four Down-Spread options: -- Down-spread: -1% to -1.75% * 14.318 MHz input (crystal or external reference) * Single 3.3V Power Supply * Packaging (Pb-Free and Green): -- SOTinyTM 6-pin SOT-23 (T) Description The PI6C3420A is spread spectrum clock synthesizer targeted for video and graphics applications. The primary purpose of the spread spectrum is to minimize EMI emissions. This device generates two 27.000 MHz outputs: a 27.000 MHz down spread spectrum output and a 27.000 MHz non-spread spectrum output. The PI6C3420A down spread range is from -1% to -1.75% when output frequency is at 27 MHz. Spread spectrums are selectable through external pins. Typically, the PI6C3420A uses a 14.318 MHz input crystal or frequency source to generate a 27 MHz clock output. Users can also get the adequate output clock setting from 15.1 MHz to 46.2 MHz by tuning the input frequency which can be set from 8 MHz to 24.5 MHz; the frequency multiplication factor is 1.886X. The PI6C3420A is housed in a lead-free and green, SOT-23, 6-pin SOTiny package. The PI6C3420A belongs to Pericom's clock and timing products. For other frequencies, features, functions or input/output not specified, please contact Pericom for information. Block Diagram Pin Configuration REFIN/X1 X2 Clock Synthesizer 27M S0 S1 27M_SSC 06-0278 1 PS8848B 08/29/06 PI6C3420A 27 MHz Spread Spectrum Clock Synthesizer Pin Description Pin Name VDD GND 27M 27M_SSC/S0 X1/REFIN X2/S1 Pin No 5 2 4 3 1 6 I/O Type Power Ground I/O I/O I/O I/O Description Power Supply Ground 27 MHz clock output. S0 is activated during power on for logic state strapping, then switches to 27 MHz SSC clock output. Crystal or reference clock input X2/S1 is a multiple function pin. S1 is active during power on selection of SSC spread then switches to crystal input. Spread Spectrum Selection Table (VCC = 3.3V10%, Ambient temperature +25, fOUT = 27 MHz) S0 0 0 1 1 S1 0 1 0 1 Down Spread(%) -1 -1.25 -1.50 -1.75 06-0278 2 PS8848B 08/29/06 PI6C3420A 27 MHz Spread Spectrum Clock Synthesizer Electrical Specifications Maximum Ratings(1) Supply Voltage to Ground Potential......................................................... 5.5V All Inputs and Outputs ..................................................... -0.5V to VDD+0.5V Ambient Operating Temperature ............................................-10C to +80C Storage Temperature .............................................................-65C to +150C Operating Temperature ................................................................. 0 to +70C, Junction Temperature ............................................................................150C Soldering Temperature ..........................................................................260C Note: 1. Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. DC Characteristics (VDD = 3.3V 10%, Ambient Temperature 0C to +70oC, fIN = 14.318 MHz, fOUT = 27 MHz) Symbol VDD VIH VIL VOH VOH VOL VOL IDD ZOUT_UP ZOUT_LOW CIN Parameter Operating Voltage Input High Voltage Input Low Voltage Output High Voltage Output High Voltage Output Low Voltage Output Low Voltage Supply Current Nominal Output Impedance Nominal Output Impedance Input Capacitance Conditions Min. +3.0 2 2.4 2.0 0.4 1.2 55 65 40 5 Typ.(1) +3.3 Max. +3.6 0.8 IOH = -4 mA IOH = -6 mA IOL = 4 mA IOL = 10 mA All outputs active with CL = 15pF load High side buffer Low side buffer Input pins Unit V V V V V V V mA pF Note: 1. Typical conditions are at 3.3V for room temperature at 25C AC Characteristics (VDD = 3.3V 10%, Ambient Temperature 0C to +70oC) Symbol fIN fOUT tRISE tFALL TJ_SHORT TDC TDC / Parameter REFIN Input Frequency Clock Output Frequency Output Clock Rise Time Output Clock Fall Time Short term jitter Input Clock Duty Cycle Output Clock Duty Cycle Actual mean frequency error versus target Conditions REFIN Clock Input Multiplication factor (fIN/fOUT = 1.885715) From 0.4V to 2.4V, CL = 15 pF load From 2.4V to 0.4V, CL = 15 pF load Cycle-to-cycle jitter (fOUT = 27 MHz) REFIN/X1, Measured @ VDD/2 Measured @ VDD/2 (fOUT = 27 MHz) Input frequency = 14.31818 MHz, Output frequency = 27 MHz Min. 8 15.1 20 45 Typ.(1) 14.318 27 3 2.7 250 50 50 0 Max. 24.5 46.2 350 80 55 Unit MHz MHz ns ns ps % % ppm Note: 1. Typical conditions are at 3.3V for room temperature at 25C 06-0278 3 PS8848B 08/29/06 PI6C3420A 27 MHz Spread Spectrum Clock Synthesizer Application Information Reference circuit for graphic chipset application(1-4) VDD 0.1F 0.01F 0.1F 0.01F VDD VDD 5 3,6 2 Strapping to low 5 3,6 2 Strapping to high Notes: 1. PI6C3420A can accept a 14.31818MHz reference clock or crystal clock. 2. Power supply pin decoupling capacitors should be placed as close as possible to VDD pin. Via's at the VDD pin should be avoided. 3. Spread select pin's (S0 and S1): Pin 3 (27M_SSC/S0) and Pin 6 (X2/S1) provide logic state strapping function. When strapping resistor connects to VDD, S0 and S1 are set to logic HIGH. When strapping resistor connects to Ground, S0 or S1 will set to logic LOW. 4. Refer to "Spread Spectrum Selection Table", for more details on the strapping logic. Crystal Load Capacitors If a crystal is used with the device, the external trim capacitors CLtrim are used to adjust the effective capacitance to match the required crystal load capacitance. The CLtrim value can be derived from formula CLtrim = 2*CL - (Cs + Ci). Typical CLtrim = 28pF when crystal load = 18pF, stray capacitance Cs = 3pF and XTAL pins capacitance = 5pF. Xtal 1 CLtrim Note: Pericom's SRX7316-E - 14.318 MHz series resonant crystal is recommended. 6 CLtrim Recommended Crystal Specification Pericom recommends: SRX7316-E Crystal for optimum performance. Parameter Mode of oscillation, and cut Frequency Frequency tolerance Tempurature Load Cap Equivalent series resistance Drive to level Aging Stability Size = Length x Width x Height 06-0278 Value Fundamental AT 14.318 20 30 18 40 100 5 11.18(.440) x 4.65(.183) x 13.46(.530) 4 Units MHz PPM PPM pF W PPM/YR mm(inch) PS8848B 08/29/06 PI6C3420A 27 MHz Spread Spectrum Clock Synthesizer DOCUMENT CONTROL NO. 0.075 1.90 BSC PD - 1912 REVISION: C DATE: 03/09/05 6 5 4 0.059 1.50 0.068 1.75 0.102 2.60 0.1183.00 Datum "A" 0 - 10 2 3 0.037 0.95 BSC 0.004 0.10 0.023 0.60 0.014 0.35 0.019 0.50 0.110 2.80 0.118 3.00 MAX. 0.057 1.45 SEATING PLANE X.XX DENOTES DIMENSIONS X.XX IN MILLIMETERS 0.000 0.00 0.005 0.15 Notes: Controlling dimensions in millimeters 1) Ref: EIAJ SC-74A 2) Foot length is measured at flat portion of foot, reference to Datum "A" 3) Pericom Semiconductor Corporation 3545 N. 1st Street, San Jose, CA 95134 1-800-435-2335 * www.pericom.com DESCRIPTION: 6-Pin Small Outline Transistor Plastic Package, SOT-23 PACKAGE CODE: T Ordering Information(1-3) Ordering Code PI6C3420ATE Package Code T PackageType Pb-free & Green, 6-Pin SOT-23 Notes: 1. Thermal characteristics and package top marking information can be found at http://www.pericom.com/packaging/ 2. E = Pb-free and Green 3. X suffix = tape/reel Pericom Semiconductor Corporation * 1-800-435-2336 * www.pericom.com 06-0278 5 PS8848B 08/29/06 |
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