vectron international 267 lowell road , hudson nh 0 3051 tel : 1 - 88 - vectron - 1 e - mail: vectron@vectron .com vcc6 - q /r series 2.5 and 3 . 3 volt lv pecl crystal oscillator the vcc6 crystal oscillator features 2.5 or 3 . 3 v lvpecl 3 rd overtone crystal for best jitter performance output f requencies to 2 7 0 mhz l ow jitter < 1 ps rm s , 12khz to 20mhz enable/disable for test and board debug - 1 0/70 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 3.3 volt supply . the vcc6 uses 3 rd overtone crystals for frequencies under 200mhz, resulting in low jitter performance , typically 0. 3 ps rms in the 12 khz to 20mhz band . out output buffer / disable enable/disable out
vcc6 - q /r series, 2.5 and 3.3v pecl crystal oscillator vectron international 2 6 7 lowell rd, hudson nh 0 3051 tel : 1 - 88 - vectron - 1 e - mail: vectron@vectron.com performance characteristics table 1. e lectrical performance parameter symbol min typical maximum units frequency f o 1 0 270 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, 0/70 c output logi c high 2 output logic low 2 v oh v ol v dd - 1.025 v dd - 1.810 v dd - 0.880 v dd - 1.62 0 v v output logic levels, - 40/85 c 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 fa ll 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 25, 50 or 100 ppm jitter, 12khz to 20mhz 5 cycle to cycle, rms cycle to cy cle, peak - peak period jitter, rms period jitter, peak - peak 0. 3 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 enabl e pull - up resistor 6 output enabled output disabled 33 1 kohm mohm 1. a 0.01uf and a 0.1uf capacitor should be located as close to the supply as possible and terminated to ground. 2. figure 1 defines these parameters. figure 2 illustrates the oper ating conditions under which t hese parameters are tested and specified. 3. symmetry is measured defined as on time/period. 4. includes calibration tolerance, operating temperature, supply voltage variations, aging (40 degreesc/10 years) and shock and vib ration (not under operation). 5. measurements made on a vcc6 - qab - 1 5 5m 52 0 using a n agilent e5052a for phase noise and lecroy 8600, 25k samples for jitter . 6. output will be enabled if enable/disable is left open. the pull resistor changes to a higher value , operating in a ?power saving mode? when enable/disable is set to a logic 0. figure 1. output waveform figure 2. typical output test conditions (25 5c ) 80 % vs 20 % t f t r period on time
vcc6 - q /r series, 2.5 and 3.3v pecl crystal oscillator vectron international 2 6 7 lowell rd, hudson nh 0 3051 tel : 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 n o internal c onnection and is floating. 2 e/d enable/disable f unction 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 v cc6 - qax package drawing table 3. vcc6 - qcx pinout pin # symbol function 1 e/d enable/disable f unction 2 nc this pin has n o internal c onnection and is floating. 3 gnd ground 4 f o output frequency 5 cf o complementary output frequency 6 v dd supply v oltage gold over nickel plating figure 4. vcc6 - qcx and vcc6 - qax package drawing
vcc6 - q /r series, 2.5 and 3.3v pecl crystal oscillator vectron international 2 6 7 lowell rd, hudson nh 0 3051 tel : 1 - 88 - vectron - 1 e - mail: vectron@vectron.com terminating pecl outputs the vcc6 incorporates a standard pecl output scheme, which are un - term i nated emitters as shown in figure 5. there are numerous application note s 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 coupling capacitor is optional, depending on the application and the input log ic requirements of the next stage . one of the most important considerations is terminating the output and complementary outputs equally. an u nused out put should not be left un - terminated, and if it one of the two outputs is left open it will result in e xcessive 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 contributors to jitter related problems. figure 5 . standard pecl output configuration fig ure 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 2 6 7 lowell rd, hudson nh 0 3051 tel : 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 an d the both the output and complementary 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; t he pull - up resis tor is a large value when e/d is set to a logic low, which reduces the current consumed. when e/d is open, or set to a logic high, the pull - up resistance becomes a s maller value which helps decrease the effects of external noise. absolute maximum ratin gs stresses in excess of the absolute maximum ratings can permanently damage the device. functional operation is not implied at these or any other conditions 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 tstorag e - 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 200 3 gross and fine leak mil - std - 883 method 1014 resistance to solvents mil - std - 883 method 2016 handling precautions although esd protection circuitry has been designed into the the vcc6 , proper precautions should be taken when handling and mounting. v i employs a human body model and a charged - device model (cdm) for esd susceptibility testing and design protection evaluation. esd thresholds are dependent on the circuit parameters used to define the model. although no industry wide standard has been adop ted 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 1 5 00 mil - std - 883 method 3 0 15 charged devic e model 1000
vcc6 - q /r series , 2.5 and 3.3v pecl crystal oscillator vectron international 2 6 7 lowell rd, hudson nh 0 3051 tel : 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 standard for pb - free assembly. the temperatures and time intervals listed are based on the pb - free small body requirements and maximum parameters are listed in table 6 , lower temperatures are also acceptable. the v cc6 is hermetically sealed so an aqueous wash is not an issue. frequencies >200mhz will need to be reflowed at 2 2 0 c m ax. table 7 . reflow profile (ipc/jedec j - std - 020b) parameter symbol va lue preheat time t s 6 0 sec min, 20 0 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 2 6 0 o c (max) t p 1 0 sec max time at 240 c (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 2 6 7 lowell rd, hudson nh 0 3051 tel : 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 1 6 7 .5 1.5 4 8 2 2 1 13 60 2 1 7 18 0 250
vcc6 - q /r series , 2.5 and 3.3v pecl crystal oscillator vectron international 2 6 7 lowell rd, hudson nh 0 3051 tel : 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 9 0.000 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 16 5.000 166.000 166.6286 166.6667 166.67 167.00 167.3316 168.200912 171.000 173.3707 175.000 180.000 187.500 190.000 195.3125 2 0 0.000 212.500 250.000 260.000 other frequencies may be available upon request . standard frequencies are frequencies which th e crystal has been designed and does not imply a stock position. ordering information vcc6 ? qx x ? x xx m xx product family frequency mhz crystal oscillator example : 125 m 00 = 125 . 00 0 supply voltage, output s ta bility options/tempe rature q = 3.3 v , lv pecl a : 10 0 ppm - 1 0 to 70 c r=2.5v, lv pecl b: 50ppm - 10 to 70 c enable/disable c: 100ppm - 40 to 85 c a : e/d is on pin 2 , pin 1 is a nc d: 50ppm - 40 to 85 c c: e/d is on pin 1 , pin 2 is a nc e: 25ppm - 10 to 70 c f: 25ppm - 40 to 85 c n ote: not all combinations of options are available. a 20ppm option over - 10/70 c 3.3v, vcc6 - 107 - frequency , is also available a 20ppm option over - 10/70 c 2.5v , vcc6 - 1 1 0 - frequen c y , is also available. ww w.vectron.com vectron international reserves the right to make changes to the product(s) and/or information contained herein without notice. no liability is assumed as a result of their use or application. no rights under any patent accompany the sale of any such product(s) or information. vcc6 - q /r (revision date: september 0 7 , 200 5 ) for additional information, please contact: usa: vectro n 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
|
