vectron international 267 lowell road, hudson nh 03051 tel: 1-88-vectron-1 e-mail: vectron@vectron.com vcc6-q/r series 2.5 and 3.3 volt lvpecl crystal oscillator the vcc6 crystal oscillator features ? 2.5 or 3.3v lvpecl ? 3 rd overtone crystal for best jitter performance ? output frequencies to 270 mhz ? 0.2ps rms jitter, 12khz-20mhz,155.52mhz ? enable/disable for test and board debug ? -10/70 or ?40/85 c operating temperature ? hermetically sealed ceramic smd package ? product is compliant to rohs directive applications ? sonet/sdh/dwdm ? fiber channel ? ethernet, gigabit ethernet ? storage area network ? digital video ? broadband access description vectron?s vcc6 crystal oscillator (xo) is quartz stabilized square wave generator with a lv- pecl output, operating off a 2.5 or 3.3 volt supply. the vcc6 uses 3 rd overtone crystals for frequencies under 200mhz, resulting in low jitter performance, typically 0.2ps rms in the 12 khz to 20mhz band for a 155.52mhz output, which is three times better than competing pll solutions. out output buffer / disable enable/disable out
vcc6-q/r series, 2.5 and 3.3v pecl crystal oscillator vectron international 267 lowell rd, hudson nh 03051 te l: 1-88-vectron-1 e-mail: vectron@vectron.com performance characteristics table 1. electrical performance parameter symbol min typical maximum units frequency f o 10 270 mhz supply voltage 1 , 3.3v q option 2.5v r option v dd 3.15 2.375 3.3 2.5 3.45 2.625 v supply current i dd 98 ma output logic levels, 0/70c output logic high 2 output logic low 2 v oh v ol v dd -1.025 v dd -1.810 v dd -0.880 v dd -1.620 v v output logic levels, -40/85c output logic high 2 output logic low 2 v oh v ol v dd -1.085 v dd -1.830 v dd -0.880 v dd -1.555 v v transition times rise time 2 fall time 2 t r t f 600 600 ps ps symmetry or duty cycle 3 sym 45 50 55 % operating temperature ( ordering option ) t op -10/70 or ?40/85 c stability ( ordering option) 4 deltaf/f 20, 25, 50 or 100 ppm jitter, 12khz to 20mhz 5 cycle to cycle, rms cycle to cycle, peak-peak period jitter, rms period jitter, peak-peak 0.2 4.8 38 2.7 23 0.7 ps output enabled 6 v ih 0.7*v dd v output disabled 6 v il 0.3*v dd v output enable/disable time t e/d 200 ns enable/disable leakage current i il 200 ua output enable pull-up resistor 6 output enabled output disabled 33 1 kohm mohm 1. a 0.01uf and a 0.1uf capacit or should be located as clos e to the supply as possible and terminated to ground. 2. figure 1 defines these param eters. figure 2 illustrates t he operating conditions under which these parameters are tested an d specified. 3. symmetry is measured defi ned as on time/period. 4. includes calibration tolerance, operat ing temperature, supply voltage variati ons, aging (40 degreesc/10 years) and shock and vibration (not under operation). 5. measurements made on a vcc6-qab-155m520 using an agilent e5052a for phase noise and lecroy 8600, 25k samples for jitter. 6. output will be enabled if enabl e/disable is left open. the pull resistor changes to a higher value, operating in a ?power sa ving mode? when enable/disable is set to a logic 0. figure 1. output waveform fi gure 2. typical output test conditions (25 5c) 80 % vs 20 % t f t r pe r io d on time
vcc6-q/r series, 2.5 and 3.3v pecl crystal oscillator vectron international 267 lowell rd, hudson nh 03051 te l: 1-88-vectron-1 e-mail: vectron@vectron.com outline diagram and pin out table 2. vcc6-qax pinout pin # symbol function 1 nc this pin has no internal connection and is floating. 2 e/d enable/disable function 3 gnd ground 4 f o output frequency 5 cf o complementary output frequency 6 v dd supply voltage table 3. vcc6-qcx pinout pin # symbol function 1 e/d enable/disable function 2 nc this pin has no internal connection and is floating. 3 gnd ground 4 f o output frequency 5 cf o complementary output frequency 6 v dd supply voltage gold over nickel plating figure 3 optional package drawing gold over nickel plating figure 4 package drawing
vcc6-q/r series, 2.5 and 3.3v pecl crystal oscillator vectron international 267 lowell rd, hudson nh 03051 te l: 1-88-vectron-1 e-mail: vectron@vectron.com terminating pecl outputs the vcc6 incorporates a standard pecl output scheme, which are un-terminated emitters as shown in figure 5. there are numerous application notes on terminating and interfacing pecl logic and the two most common methods are a single resistor to ground, figure 6, and a pull-up/pull-down scheme as shown in figure 7. an ac coup ling capacitor is optional, depending on the application and the input logic requirements of the next stage. one of the most important considerations is term inating the output and comp lementary outputs equally. an unused output should not be left un-terminated, and if it one of the two outputs is left open it will result in excessive jitter on both. pc board layout must take this and 50 ohm impedance matching into account. load matching and power supply noise are the main c ontributors to jitter related problems. figure 5. standard pecl output configuration figure 6. single resistor termination figure 7. pull-up pull-down termination resistor value are typically: resistor values are typically: 120 to 240ohms for 3.3v 130 and 82 ohms for 3.3v 82 to 120 ohms for 2.5v 240 and 62 ohms for 2.5v
vcc6-q/r series, 2.5 and 3.3v pecl crystal oscillator vectron international 267 lowell rd, hudson nh 03051 te l: 1-88-vectron-1 e-mail: vectron@vectron.com enable/disable functional description under normal operation the enable/disable is left open, or set to a logic high state, and the vcc6 is in oscillation mode and outputs are enabled (active). when the e/ d is set to a logic low, the oscillator stops and the both the output and complement ary outputs are in a high impedance state. this helps facilitate board testing and troubleshooting. power saving pull-up resistor the e/d pull-up resistor changes in response to the input logic level; the pull-up resistor is a large value when e/d is set to a logic low, which reduces the cu rrent consumed. when e/d is open, or set to a logic high, the pull-up resistance becomes a smaller value whic h helps decrease the effects of external noise. absolute maximum ratings stresses in excess of the absolute maximum rati ngs can permanently damage the device. functional operation is not implied at these or any other c onditions in excess of conditions represented in the operational sections of this data sheet. exposure to absolute maximum ratings for extended periods may adversely affect device reliability. table 4. absolute maximum ratings parameter symbol ratings unit power supply v dd -0.5 to +7.0 vdc enable/disable v in -0.5 to v dd +0.5 vdc storage temperature tstorage -55/125 c reliability the vcc6 qualification tests included: table 5. environnemental compliance parameter conditions mechanical shock mil-std-883 method 2002 mechanical vibration mil-std-883 method 2007 solderability mil-std-883 method 2003 gross and fine leak mil-std-883 method 1014 resistance to solvents mil-std-883 method 2016 moisture sensitivity level msl1 handling precautions although esd protection circuitry has been designed in to the the vcc6, proper precautions should be taken when handling and mounting. vi employs a human body model and a charged-device model (cdm) for esd susceptibility testing and design prot ection evaluation. esd thresholds are dependent on the circuit parameters used to define the m odel. although no industry wide standard has been adopted for the cdm, a standard hbm of resistance = 1. 5kohms and capacitance = 100pf is widely used and therefore can be used for comparison purposes. table 6. esd ratings model minimum conditions human body model 1500 mil-std-883 method 3115 charged device model 1000 jesd22-c101
vcc6-q/r series, 2.5 and 3.3v pecl crystal oscillator vectron international 267 lowell rd, hudson nh 03051 te l: 1-88-vectron-1 e-mail: vectron@vectron.com ir reflow and suggested pad size layout the vcc6 has been qualified to meet the jedec standar d for pb-free assembly. the temperatures and time intervals listed are based on the pb-free sm all body requirements and maximum parameters are listed in table 7, lower temperatures are also acceptable. the vcc6 is hermetically sealed so an aqueous wash is not an issue. table 7. reflow profile (ipc/jedec j-std-020b) parameter symbol value preheat time t s 60 sec min, 200 sec max ramp up r up 3 o c/sec max time above 217 o c t l 60 sec min, 150 sec max time to peak temperature t amb-p 480 sec max time at 260 o c (max) t p 10 sec max time at 240c (max) tp2 60 sec max ramp down r dn 6 o c/sec max figure 8. ir reflow diagram figure 9. pad size diagram
vcc6-q/r series, 2.5 and 3.3v pecl crystal oscillator vectron international 267 lowell rd, hudson nh 03051 te l: 1-88-vectron-1 e-mail: vectron@vectron.com a e c d b g f j l i k h tape and reel figure 10. tape and reel diagram table 8. tape and reel dimensions (mm) tape dimensions reel dimensions # per product a b c d e f g h i j k l reel vcc6 16 7.5 1.5 4 8 2 21 13 60 2 17 180 250
vcc6-q/r series, 2.5 and 3.3v pecl crystal oscillator vectron international 267 lowell rd, hudson nh 03051 te l: 1-88-vectron-1 e-mail: vectron@vectron.com table 9. standard frequencies (mhz) 19.440 27.000 27.027 35.000 37.000 38.880 40.000 40.680 48.000 50.000 52.300 62.500 64.000 64.375 74.1758 74.250 76.800 77.760 80.000 83.125 87.000 90.000 91.875 93.000 98.304 100.000 105.000 106.000 106.250 110.000 125.000 130.000 130.5882 133.000 134.560729 135.000 136.000 143.000 145.221 150.000 153.500 155.520 156.000 156.250 156.256 156.260 159.375 160.000 160.160 161.1328 163.235 164.3555 165.000 166.000 166.6286 166.6667 166.67 167.00 167.3316 168.200912 171.000 173.3707 175.000 180.000 187.500 190.000 195.3125 200.000 212.500 250.000 260.000 other frequencies may be available upon request. standard frequencies are frequencies which the crystal has been designed and does not imply a stock position. ordering information vcc6 ? qxx ? xxxmxx product family frequency mhz crystal oscillator example: 125m00= 125.000 supply voltage, output stability options/temperature q=3.3v, lvpecl a: 100ppm -10 to 70c r=2.5v, lvpecl b: 50ppm -10 to 70c enable/disable c: 100ppm -40 to 85c a: e/d is on pin 2, pin 1 is a nc d: 50ppm -40 to 85c c: e/d is on pin 1, pin 2 is a nc e: 25ppm -10 to 70c f: 25ppm -40 to 85c note: not all combinations of options are available. a 20ppm option over -10/70c 3.3v, v cc6-107-frequency, is also available a 20ppm option over -10/70c 2.5v, v cc6-110-frequency, is also available. www.vectron.com vectron international reserves the right to make changes to the product(s) and/or in formation contained her ein without notice. no liability is assumed as a result of their use or app lication. no rights under any patent accompany the sale of any su ch product(s) or information. vcc6-q/r (revision date: april 15, 2008) for additional information, please contact: usa: vectron international ? 267 lowell road, hudson, nh 03051 ? tel: 1-88-vectron-1 ? fax: 1-888-fax-vectron europe: landstrasse, d-74924, neckarbischofsheim, germany ? tel: 49 (0) 7268 8010 ? fax: 49 (0) 7268 801281 asia: vectron asia pacific sales 1f~2f. no.8 workshop no.308 fenju rd., waigaoqiao free trade zone, pudong new area shanghai, china 200131 ?tel: 8621 50480777 ? fax: 8621 50481881
|
