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| the smart timing choice ? the smart timing choice ? sitime corporation 990 almanor avenue sunnyvale, ca 94085 (408) 328-4400 www.sitime.com rev. 1.02 revised june 24, 2013 SIT8208 ultra performance oscillator note: 1. all electrical specifications in the above table are specified with 15 pf output load and for all vdd(s) unless otherwise sta ted. features applications ? any frequency between 1 and 80 mhz accurate to 6 decimal places ? sata, sas, ethernet, pci express, video, wifi ? 100% pin-to-pin drop-in replacement to quartz-based oscillators ? computing, storage, networking, telecom, industrial control ? ultra low phase jitter: 0.5 ps (12 khz to 20 mhz) ? frequency stability as low as 10 ppm ? industrial or extended commercial temperature range ? lvcmos/lvttl compatible output ? standard 4-pin packages: 2.5 x 2.0, 3.2 x 2.5, 5.0 x 3.2, 7.0 x 5.0 mm x mm ? instant samples with time machine ii and field programmable oscillators ? outstanding silicon reliability of 2 fit or 500 million hour mtbf ? pb-free, rohs and reach compliant ? ultra short lead time electrical characteristics [1] parameter symbol min. typ. max. unit condition frequency range output frequency range f1?80mhz frequency stability and aging frequency stability f_stab -10 ? +10 ppm inclusive of initial tolerance at 25 c, and variations over operating temperature, rated power supply voltage and load -20 ? +20 ppm -25 ? +25 ppm -50 ? +50 ppm first year aging f_aging -1.5 ? +1.5 ppm 25c 10-year aging -5 ? +5 ppm 25c operating temperature range operating temperature range t_use -20 ? +70 c extended commercial -40 ? +85 c industrial supply voltage and current consumption supply voltage vdd 1.71 1.8 1.89 v supply voltages between 2.5v and 3.3v can be supported. contact sitime for additional information. 2.25 2.5 2.75 v 2.52 2.8 3.08 v 2.97 3.3 3.63 v current consumption idd ? 31 33 ma no load condition, f = 20 mhz, vdd = 2.5v, 2.8v or 3.3v ? 29 31 ma no load condition, f = 20 mhz, vdd = 1.8v oe disable current i_od ? ? 31 ma vdd = 2.5v, 2.8v or 3.3v, oe = gnd, output is weakly pulled down ? ? 30 ma vdd = 1.8 v. oe = gnd, output is weakly pulled down standby current i_std ? ? 70 ? a vdd = 2.5v, 2.8v or 3.3v, st = gnd, output is weakly pulled down ??10 ? a vdd = 1.8 v. st = gnd, output is weakly pulled down lvcmos output characteristics duty cycle dc 45 ? 55 % rise/fall time tr, tf ? 1.2 2 ns 15 pf load, 10% - 90% vdd output voltage high voh 90% ? ? vdd ioh = -6 ma, iol = 6 ma, (vdd = 3.3v, 2.8v, 2.5v) ioh = -3 ma, iol = 3 ma, (vdd = 1.8v) output voltage low vol? ?10%vdd input characteristics input voltage high vih 70% ? ? vdd pin 1, oe or st input voltage low vil ? ? 30% vdd pin 1, oe or st input pull-up impedance z_in ? 100 250 k ? pin 1, oe logic high or logic low, or st logic high 2??m ? pin 1, st logic low
the smart timing choice ? the smart timing choice ? SIT8208 ultra performance oscillator rev. 1.02 page 2 of 10 www.sitime.com thermal consideration electrical characteristics [1] (continued) parameter symbol min. typ. max. unit condition startup and resume timing startup time t_start ? 7 10 ms measured from the time vdd reaches its rated minimum value oe enable/disable time t_oe ? ? 150 ns f = 80 mhz, for other frequencies, t_oe = 100 ns + 3 cycles resume time t_resume ? 6 10 ms in standby mode, measured from the time st pin crosses 50% threshold. refer to figure 5 . jitter rms period jitter t_jitt ? 1.5 2 ps ? 2 3 ps f = 75 mhz, vdd = 1.8v rms phase jitter (random) t_phj ? 0.5 1 ps f = 10 mhz, integration bandwidth = 12 khz to 20 mhz note: 1. all electrical specifications in the above table are specified with 15 pf output load and for all vdd(s) unless otherwise st ated. pin configuration pin symbol functionality 1 oe/ st output enable h or open [2] : specified frequency output l: output is high impedance. on ly output driver is disabled. standby h or open [2] : specified frequency output l: output is low (weak pull down). device goes to sleep mode. supply current reduces to i_std. 2 gnd power electrical ground [3] 3 out output oscillator output 4 vdd power power supply voltage [3] notes: 2. a pull-up resistor of <10 k ? between oe/ st pin and vdd is recommended in high noise environment. 3. a capacitor of value 0.1 f between vdd and gnd is recommended. absolute maximum attempted operation outside the absolute maximum ratings of the part may cause pe rmanent damage to the part. actual perfor- mance of the ic is only guaranteed within the operatio nal specifications, not at absolute maximum ratings. parameter min. max. unit storage temperature -65 150 c vdd -0.5 4 v electrostatic discharge ? 2000 v soldering temperature (follow standard pb free soldering guidelines) ? 260 c junction temperature ? 150 c package ? ja, 4 layer board (c/w) ? ja, 2 layer board (c/w) ? jc, bottom (c/w) 7050 191 263 30 5032 97 199 24 3225 109 212 27 2520 117 222 26 environmental compliance parameter condition/test method mechanical shock mil-std-883f, method 2002 mechanical vibration mil-std-883f, method 2007 temperature cycle jesd22, method a104 solderability mil-std-883f, method 2003 moisture sensitivity level msl1 @ 260c 1 4 oe/st vdd 3 2 gnd out top view the smart timing choice ? the smart timing choice ? SIT8208 ultra performance oscillator rev. 1.02 page 3 of 10 www.sitime.com notes: 4. duty cycle is computed as duty cycle = th/period. 5. SIT8208 supports the configurable duty cycle feature. for custom duty cycle at any given frequency, contact sitime . phase noise plot figure 1. phase noise, 10 mhz, 3.3v, lvcmos output test circuit and waveform figure 2. test circuit figure 3. waveform 10 3 10 4 10 5 10 6 -170 -160 -150 -140 -130 -120 -110 -100 frequency offset (hz) phase noise (dbc/hz) integrated random phase jitter (rms, 12khz-5mhz): 0.52ps 4 1 3 2 0.1f power supply oe/st function test point 15pf (including probe and fixture capacitance) vdd vout vdd 1k ? 90% vdd high pulse (th) 50% 10% vdd period tf tr low pulse (tl) the smart timing choice ? the smart timing choice ? SIT8208 ultra performance oscillator rev. 1.02 page 4 of 10 www.sitime.com timing diagram figure 4. startup timing (oe/st mode) figure 5. standby resume timing (st mode only) u figure 6. oe enable timing (oe mode only) figure 7. oe disable timing (oe mode only) notes: 6. SIT8208 supports no runt pulses and no glitches during startup or resume. 7. SIT8208 supports gated output which is accurate wi thin rated frequency stability from the first cycle. 90% vdd, 2.5/2,8/3.3v devices 95% vdd, 1.8v devices vdd pin 4 voltage clk output t_start t_start: time to start from power-off no glitch first cycle 50% vdd vdd st voltage clk output t_resume t_resume: time to resume from st 50% vdd vdd oe voltage clk output t_oe t_oe: time to re-enable the clock output 50% vdd vdd oe voltage clk output t_oe: time to put the output drive in high z mode hz t_oe the smart timing choice ? the smart timing choice ? SIT8208 ultra performance oscillator rev. 1.02 page 5 of 10 www.sitime.com performance plots figure 8. idd vs frequency figure 9. rms period jitter vs frequency figure 10. duty cycle vs frequency figure 11. rms phase jitter vs frequency figure 12. idd vs temperature, 10 mhz output figu re 13. rise time vs temperature, 75 mhz output note: 8. all plots are measured with 15 pf load at room temperature, unless otherwise stated. 20.0 22.0 24.0 26.0 28.0 30.0 32.0 34.0 36.0 38.0 40.0 10 20 30 40 50 60 70 80 frequency, mhz idd, ma 3.3v 2.5v 1.8v 0.00 0.50 1.00 1.50 2.00 2.50 3.00 10 20 30 40 50 60 70 80 frequency, mhz rms period jitter, ps 3.3v 2.5v 1.8v 45.0 46.0 47.0 48.0 49.0 50.0 51.0 52.0 53.0 54.0 55.0 10 20 30 40 50 60 70 80 frequency, mhz duty cycle, % 3.3v 2.5v 1.8v 2.5v 3.3v 1.8v 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 10 20 30 40 50 60 70 80 frequency, mhz rms phase jitter, ps 25 27 29 31 33 35 -40 -20 0 20 40 60 80 temperature, c idd, ma 1.8v 2.5v 3.3v 0.0 0.5 1.0 1.5 2.0 -40 -20 0 20 40 60 80 temperature, c rise time, ns 1.8v 2.5v 3.3v the smart timing choice ? the smart timing choice ? SIT8208 ultra performance oscillator rev. 1.02 page 6 of 10 www.sitime.com programmable drive strength the SIT8208 includes a progra mmable drive strength feature to provide a simple, flexible tool to optimize the clock rise/fall time for specific applications. benefits from the programmable drive strength feature are: ? improves system radiated electromagnetic interference (emi) by slowing down the clock rise/fall time ? improves the downstream clock receiver?s (rx) jitter by de- creasing (speeding up) the clock rise/fall time. ? ability to drive large capacitive loads while maintaining full swing with sharp edge rates. for more detailed information about rise/fall time control and drive strength selection, see the sitime applications note section; http://www.sitime.com/s upport/application-notes. emi reduction by slowing rise/fall time figure 14 shows the harmonic power reduction as the rise/fall times are increased (slowed down). the rise/fall times are expressed as a ratio of the clock period. for the ratio of 0.05, the signal is very close to a square wave. for the ratio of 0.45, the rise/fall times are very close to near-triangular waveform. these results, for example, show that the 11th clock harmonic can be reduced by 35 db if the rise/fall edge is increased from 5% of the period to 45% of the period. figure 14. harmonic emi reduction as a function of slower rise/fall time jitter reduction with faster rise/fall time power supply noise can be a source of jitter for the downstream chipset. one way to reduce this jitter is to increase rise/fall time (edge rate) of the input clock. some chipsets would require faster rise/fall time in order to reduce their sensitivity to this type of jitter. the SIT8208SIT8208 provides up to 3 additional high drive strength settings for very fast rise/fall time. refer to the rise/fall time tables to determine the proper drive strength. high output load capability the rise/fall time of the input cl ock varies as a function of the actual capacitive load the clock drives. at any given drive strength, the rise/fall time becomes slower as the output load increases. as an example, for a 3.3v SIT8208 device with default drive strength setting, t he typical rise/fall time is 1.15ns for 15 pf output load. the typical rise/fall time slows down to 2.72ns when the output load increases to 45 pf. one can choose to speed up the rise/fall time to 1.41ns by then increasing the drive strength setting on the SIT8208. the SIT8208 can support up to 60 pf or higher in maximum capacitive loads with up to 3 additional drive strength settings. refer to the rise/tall time tables to determine the proper drive strength for the desired combination of output load vs. rise/fall time SIT8208 drive strength selection tables 1 through 5 define the rise/fall time for a given capac- itive load and supply voltage. 1. select the table that matches the SIT8208 nominal supply voltage (1.8v, 2.5v, 2.8v, 3.0v, 3.3v). 2. select the capacitive load column that matches the appli- cation requirement (5 pf to 60 pf) 3. under the capacitive load column, select the desired rise/fall times. 4. the left-most column represents the part number code for the corresponding drive strength. 5. add the drive strength code to the part number for ordering purposes. calculating maximum frequency based on the rise and fall time data given in tables 1 through 4, the maximum frequency the oscillator can operate with guaranteed full swing of the ou tput voltage over temperature as follows: example 1 calculate f max for the following condition: ? vdd = 1.8v (table 1) ? capacitive load: 30 pf ? desired tr/f time = 3 ns (rise/f all time part number code = g) part number for the above example: SIT8208ai g g2-18e-55.500000 drive strength code is inserted here. default setting is ?-? ? 1357911 -80 -70 -60 -50 -40 -30 -20 -10 0 10 harmonic number harmonic amplitude (db) trise=0.05 trise=0.1 trise=0.15 trise=0.2 trise=0.25 trise=0.3 trise=0.35 trise=0.4 trise=0.45 = 1 6 x (t rise ) max frequency the smart timing choice ? the smart timing choice ? SIT8208 ultra performance oscillator rev. 1.02 page 7 of 10 www.sitime.com rise/fall time (10% to 90%) vs c load tables table 1. vdd = 1.8v rise/fa ll times for specific c load table 2. vdd = 2.5v rise/fall times for specific c load table 3. vdd = 2.8v rise/fall times for specific c load table 4. vdd = 3.3v rise/fall times for specific c load drive strength \ c load 5 pf 15 pf 30 pf 45 pf 60 pf l 12.45 17.68 19.48 46.21 57.82 a 6.50 10.27 16.21 23.92 30.73 r 4.38 7.05 11.61 16.17 20.83 b 3.27 5.30 8.89 12.18 15.75 s 2.62 4.25 7.20 9.81 12.65 d 2.19 3.52 6.00 8.31 10.59 t 1.76 3.01 5.14 7.10 9.15 e 1.59 2.59 4.49 6.25 7.98 u 1.49 2.28 3.96 5.55 7.15 f 1.22 2.10 3.57 5.00 6.46 w 1.07 1.88 3.23 4.50 5.87 g 1.01 1.64 2.95 4.12 5.40 x 0.96 1.50 2.74 3.80 4.98 k 0.92 1.41 2.56 3.52 4.64 y 0.88 1.34 2.39 3.25 4.32 q 0.86 1.29 2.24 3.04 4.06 z or "-": default 0.82 1.24 2.07 2.89 3.82 m 0.77 1.20 1.94 2.72 3.61 n 0.66 1.15 1.84 2.58 3.41 p 0.51 1.09 1.76 2.45 3.24 rise/fall time typ (ns) drive strength \ c load 5 pf 15 pf 30 pf 45 pf 60 pf l 8.68 13.59 18.36 32.70 42.06 a 4.42 7.18 11.93 16.60 21.38 r 2.93 4.78 8.15 11.19 14.59 b 2.21 3.57 6.19 8.55 11.04 s 1.67 2.87 4.94 6.85 8.80 d 1.50 2.33 4.11 5.68 7.33 t 1.06 2.04 3.50 4.84 6.26 e 0.98 1.69 3.03 4.20 5.51 u 0.93 1.48 2.69 3.73 4.92 f 0.90 1.37 2.44 3.34 4.42 w 0.87 1.29 2.21 3.04 4.02 g or "-": default 0.67 1.20 2.00 2.79 3.69 x 0.44 1.10 1.86 2.56 3.43 k 0.38 0.99 1.76 2.37 3.18 y 0.36 0.83 1.66 2.20 2.98 q 0.34 0.71 1.58 2.07 2.80 z 0.33 0.65 1.51 1.95 2.65 m 0.32 0.62 1.44 1.85 2.50 n 0.31 0.59 1.37 1.77 2.39 p 0.30 0.57 1.29 1.70 2.28 rise/fall time typ (ns) drive strength \ c load 5 pf 15 pf 30 pf 45 pf 60 pf l 7.93 12.69 17.94 30.10 38.89 a 4.06 6.66 11.04 15.31 19.80 r 2.68 4.40 7.53 10.29 13.37 b 2.00 3.25 5.66 7.84 10.11 s 1.59 2.57 4.54 6.27 8.07 d 1.19 2.14 3.76 5.21 6.72 t 1.00 1.79 3.20 4.43 5.77 e 0.94 1.51 2.78 3.84 5.06 u 0.90 1.38 2.48 3.40 4.50 f 0.87 1.29 2.21 3.03 4.05 w 0.62 1.19 1.99 2.76 3.68 g or "-": default 0.41 1.08 1.84 2.52 3.36 x 0.37 0.96 1.72 2.33 3.15 k 0.35 0.78 1.63 2.15 2.92 y 0.33 0.67 1.54 2.00 2.75 q 0.32 0.63 1.46 1.89 2.57 z 0.31 0.60 1.39 1.80 2.43 m 0.30 0.57 1.31 1.72 2.30 n 0.30 0.56 1.22 1.63 2.22 p 0.29 0.54 1.13 1.55 2.13 rise/fall time typ (ns) drive strength \ c load 5 pf 15 pf 30 pf 45 pf 60 pf l 7.18 11.59 17.24 27.57 35.57 a 3.61 6.02 10.19 13.98 18.10 r 2.31 3.95 6.88 9.42 12.24 b 1.65 2.92 5.12 7.10 9.17 s 1.43 2.26 4.09 5.66 7.34 d 1.01 1.91 3.38 4.69 6.14 t 0.94 1.51 2.86 3.97 5.25 e 0.90 1.36 2.50 3.46 4.58 u 0.86 1.25 2.21 3.03 4.07 f or "-": default 0.48 1.15 1.95 2.72 3.65 w 0.38 1.04 1.77 2.47 3.31 g 0.36 0.87 1.66 2.23 3.03 x 0.34 0.70 1.56 2.04 2.80 k 0.33 0.63 1.48 1.89 2.61 y 0.32 0.60 1.40 1.79 2.43 q 0.32 0.58 1.31 1.69 2.28 z 0.30 0.56 1.22 1.62 2.17 m 0.30 0.55 1.12 1.54 2.07 n 0.30 0.54 1.02 1.47 1.97 p 0.29 0.52 0.95 1.41 1.90 rise/fall time typ (ns) the smart timing choice ? the smart timing choice ? SIT8208 ultra performance oscillator rev. 1.02 page 8 of 10 www.sitime.com instant samples with time machine and field programmable oscillators sitime supports a field programmable version of the SIT8208 low power oscillator for fast prototyping and real time custom- ization of features. the field programmable devices (fp devices) are available for all five standard SIT8208 package sizes and can be configured to one?s exact specification using the time machine ii , an usb powered mems oscillator programmer. customizable features of the SIT8208 fp devices include ? any frequency between 1 ? 110 mhz ? three frequency stability options, 20 ppm, 25 ppm, 50 ppm ? two operating temperatures, -20 to 70c or -40 to 85c ? five supply voltage options, 1.8v, 2.5v, 2.8v, 3.0v, and 3.3v ? output drive strength for more information regarding sitime?s field programmable solutions, visit http://www.sitime.com/time-machine and http://www.sitime.com/fp-devices . SIT8208 is typically factory-programmed per customer ordering codes for volume delivery. the smart timing choice ? the smart timing choice ? SIT8208 ultra performance oscillator rev. 1.02 page 9 of 10 www.sitime.com notes: 9. top marking: y denotes manufacturing origin and xxxx denotes manufacturing lot number. the value of ?y? will depend on the as sembly location of the device. 10. a capacitor of value 0.1 f between vdd and gnd is recommended. dimensions and patterns package size ? dimensions (unit: mm) [9] recommended land pattern (unit: mm) [10] 2.7 x 2.4 x 0.75 mm (100% compatible with 2.5 x 2. 0 mm footprint) 3.2 x 2.5 x 0.75 mm 5.0 x 3.2 x 0.75 mm 7.0 x 5.0 x 0.90 mm yxxxx 2.7 0.05 1.00 0.75 0.05 2.4 0.05 0.85 1.25 0.50 1.9 1.1 1.5 1.0 3.2 0.05 2.5 0.05 2.1 0.9 0.7 0.9 0.75 0.05 #1 #2 #4 #3 #2 #1 #3 #4 yxxxx 2.2 1.9 1. 4 1.2 5.0 0.05 3.2 0.05 2.39 0.8 1.15 1.1 0.75 0.05 #1 #2 #4 #3 #2 #1 #3 #4 yxxxx 2.54 1.5 1. 6 2.2 5.0 0.05 1.4 1.1 5.08 7.0 0.05 2.6 0.90 0.10 yxxxx 5.08 3.81 2.2 2.0 rev. 1.02 page 10 of 10 www.sitime.com ? sitime corporation 2013. the information contained herein is subject to change at any time without notice. sitime assumes no responsibility or liability for any loss, damage or defect of a product which is caused in whole or in part by (i) use of any circuitry other than circuitry embodied in a sitime product, (ii) misuse or abuse including static discharge, neglect or accident, (iii) unauthorized modification or repairs which have been soldered or altered during assembly and are not capable of being tested by sitime under its normal test conditions, or (iv) improper installation, storage, handling, warehousing or transportation, or (v) being subjected to unusual physical, thermal, or electri cal stress. disclaimer: sitime makes no warranty of any kind, express or implied, with regard to this material, and specifically disclaims any and al l express or implied warranties, either in fact or by operation of law, statutory or otherwise, including the implied warranties of merchantability and fitness for use or a particul ar purpose, and any implied warranty arising from course of dealing or usage of trade, as well as any common-law duties relating to accuracy or lack of negligence, with respect to this material, any sitime product and any product documentation. products sold by sitime are not suitable or intended to be used in a life support application or co mponent, to operate nuclear facilities, or in other mission critical applications where human life may be involved or at stake. all sales are made conditioned upon compliance with the critical uses policy set forth below. critical use exclusion policy buyer agrees not to use sitime's products for any application or in any components used in life support devices or to operate n uclear facilities or for use in other mission-critical applications or comp onents where human life or property may be at stake. sitime owns all rights, title and interest to the intellectual property related to sitime's products, including any software, f irmware, copyright, patent, or trademark. the sale of sitime products does not convey or imply any license under patent or other rights. sitime retains the copyright and trademark rights in all doc uments, catalogs and plans supplied pursuant to or ancillary to the sale of products or services by sitime. unless otherwise agreed to in writing by sitime, any reproduction, modification, transl ation, compilation, or representation of this material shall be strictly prohibited. the smart timing choice ? the smart timing choice ? ultra performance oscillator SIT8208 ordering information the part no. guide is for reference only. to customize and build an exact part number, use the sitime part number generator. additional information document description download link time machine ii mems oscillator programmer http://www.sitime. com/support/time-machine- oscillator-programmer field programmable oscillators devices that can be programmable in the field by time machine ii http://www.sitime.com/ products/field-programmable-oscillators manufacturing notes tape & reel dimension, reflow profile and other manufacturing related info http://www.sitime.co m/component/docman/ doc_download/85-manu facturing-notes-for-sitime-oscillators qualification reports rohs report, reliability reports, composition reports http://www.sitime. com/support/quality-and-reliability performance reports additional performance data such as phase noise, current consumption and jitter for selected frequencies http://www.sitim e.com/support/performanc e-measurement-report termination techniques termination design recommendations http://www.sitim e.com/support/a pplication-notes layout techniques layout recommendations http://www.sitim e.com/support/a pplication-notes frequency 1.000000 to 80.000000 mhz part family ?SIT8208? revision letter ?a? is the silicon revision temperature range ?i? industrial, -40 to 85oc voltage supply ?18? for 1.8v 5% ?25? for 2.5v 10% ?28? for 2.8v 10% ?33? for 3.3v 10% packaging blank for bulk feature pin ?e? for output enable ?s? for standby ?c? ext. commercial, -20 to 70oc frequency tolerance ?2? for 25 ppm ?3? for 50 ppm package ?2? 3.2 x 2.5 ?3? 5.0 x 3.2 ?t?: tape & reel, 3k reel ?y?: tape & reel, 1k reel ?8? 7.0 x 5.0 SIT8208ac -23-25e -75.123456t ?1? for 20 ppm ?f? for 10 ppm ?g? 2.5 x 2.0 output drive strength ??? default (datasheet limits) see tables 1 to 5 for rise/fall times ?l? ?a? ?r? ?b? ?s? ?d? ?t? ?e? ?u? ?f? ?w? ?g? ?x? ?k? ?y? ?q? ?z? ?m? ?n? ?p? the smart timing choice ? the smart timing choice ? sitime corporation 990 almanor avenue sunnyvale, ca 94085 (408) 328-4400 www.sitime.com supplemental information the supplemental information section is not part of the datasheet and is for informational purposes only. the smart timing choice ? the smart timing choice ? sitime corporation 990 almanor avenue sunnyvale, ca 94085 (408) 328-4400 www.sitime.com silicon mems outperforms quartz rev. 1.0 revised january 16, 2013 silicon mems outperforms quartz the smart timing choice ? the smart timing choice ? silicon mems outperforms quartz silicon mems outperforms quartz rev. 1.0 www.sitime.com best reliability silicon is inherently more reliable than quartz. unlike quartz suppliers, sitime has in-house mems and analog cmos expertise, which allows sitime to develop the most reliable products. figure 1 shows a comparison with quartz technology. why is sitime best in class: ? sitime?s mems resonators are vacuum sealed using an advanced epi-seal? process, which eliminates foreign particles and improves long term aging and reliability ? world-class mems and cmos design expertise figure 1. reliability comparison [1] best aging unlike quartz, mems oscillators have excellent long term aging performance which is why every new sitime product specifies 10-year aging. a comparison is shown in figure 2. why is sitime best in class: ? sitime?s mems resonators are vacuum sealed using an advanced epi-seal? process, which eliminates foreign particles and improves long term aging and reliability ? inherently better immunity of electrostatically driven mems resonator figure 2. aging comparison [2] best electro magnetic susceptibility (ems) sitime?s oscillators in plastic packages are up to 54 times more immune to external electromagnetic fields than quartz oscillators as shown in figure 3. why is sitime best in class: ? internal differential architecture for best common mode noise rejection ? electrostatically driven mems resonator is more immune to ems figure 3. electro magnetic susceptibility (ems) [3] best power supply noise rejection sitime?s mems oscillators are more resilient against noise on the power supply. a comparison is shown in figure 4. why is sitime best in class: ? on-chip regulators and internal differential architecture for common mode noise rejection ? best analog cmos design expertise figure 4. power supply noise rejection [4] mean time between failure (million hours) 14 16 28 38 500 0 200 400 600 pericom txc epson idt (fox) sitime sitime 20x better 1.5 3.5 3.0 8.0 0 2 4 6 8 10 1-year 10-year sitime mems vs. quartz aging sitime mems oscillator quartz oscillator aging (ppm) sitime 2x better - 39 - 40 - 42 - 43 - 45 - 73 - 90 - 80 - 70 - 60 - 50 - 40 - 30 kyocera epson txc cw silabs sitime sitime vs quartz electro magnetic susceptibility (ems) a v e r a g e s p u r s ( d b ) sitime 54x better 0.0 1.0 2.0 3.0 4.0 5.0 10 100 1,000 10,000 a d d i t i v e i n t e g r a t e d p h a s e j i t t e r p e r m v p - p i n j e c t e d n o i s e ( p s / m v ) power supply noise frequency (khz) power supply noise rejection sitime ndk epson kyocera sitime ? sitime 3x better the smart timing choice ? the smart timing choice ? silicon mems outperforms quartz silicon mems outperfo rms quartz rev. 1.0 www.sitime.com best vibration robustness high-vibration environments are all around us. all electronics, from handheld devices to enterprise servers and storage systems are subject to vibration. figure 5 shows a comparison of vibration robustness. why is sitime best in class: ? the moving mass of sitime?s mems resonators is up to 3000 times smaller than quartz ? center-anchored mems resonator is the most robust design figure 5. vibration robustness [5] best shock robustness sitime?s oscillators can withstand at least 50,000 g shock. they all maintain their electrical performance in operation during shock events. a comparison with quartz devices is shown in figure 6. why is sitime best in class: ? the moving mass of sitime?s mems resonators is up to 3000 times smaller than quartz ? center-anchored mems resonator is the most robust design figure 6. shock robustness [6] vibration sensitivity (ppb/g) 0.10 1.00 10.00 100.00 10 100 1000 vibration frequency (hz) vibration sensitivity vs. frequency sitime txc epson connor winfield kyocera silabs sitime up to 30x better 14.3 12.6 3.9 2.9 2.5 0.6 0 2 4 6 8 10 12 14 16 k y ocer a e p son txc cw silab s sitime differential xo shock robustness - 500 g sitime up to 25x better peak frequency deviation (ppm) notes: 1. data source: reliability documents of named companies. 2. data source: sitime and quartz oscillator devices datasheets. 3. test conditions for electro magnetic susceptibility (ems): ? according to iec en61000-4.3 (electromagnetic compatibility standard) ? field strength: 3v/m ? radiated signal modulation: am 1 khz at 80% depth ? carrier frequency scan: 80 mhz ? 1 ghz in 1% steps ? antenna polarization: vertical ? dut position: center aligned to antenna devices used in this test: sitime, sit9120ac-1d2-33e156.250000 - mems based - 156.25 mhz epson, eg-2102ca 156.2500m-phpal3 - saw based - 156.25 mhz txc, bb-156.250mbe-t - 3rd overtone quartz based - 156.25 mhz kyocera, kc7050t156.250p30e00 - saw based - 156.25 mhz connor winfield (cw), p123-156.25m - 3rd overtone quartz based - 156.25 mhz silabs, si590ab-bdg - 3rd ov ertone quartz based - 156.25 mhz 4. 50 mv pk-pk sinusoidal voltage. devices used in this test: sitime, SIT8208ai-33-33e-25.000000, mems based - 25 mhz ndk, nz2523sb-25.6m - quartz based - 25.6 mhz kyocera, kc2016b25m0c1ge00 - quartz based - 25 mhz epson, sg-310scf-25m0-mb3 - quartz based - 25 mhz 5. devices used in this test: same as ems test stated in note 3. 6. test conditions for shock test: ? mil-std-883f method 2002 ? condition a: half sine wave shock pulse, 500-g, 1ms ? continuous frequency measurement in 100 s gate time for 10 seconds devices used in this test: same as ems test stated in note 3 7. additional data, including setup and detailed results, is av ailable upon request to qualified customers. please contact productsupport@sitime.com . the smart timing choice ? the smart timing choice ? document feedback form feedback form rev. 1.0 www.sitime.com sitime values your input in improving our documentation. click here for our online feedback form or fill out and email the form below to productsupport@sitime.com . 1. does the electrical characteristics table provide complete information? yes no if no, what parameters are missing? _________________________________________________________________________________________________ 2. is the organization of this document easy to follow? yes no if ?no,? please suggest improvements that we can make: _________________________________________________________________________________________________ 3. is there any application specific in formation that you would like to see in this document? (check all that apply) emi termination recommendations sho ck and vibration performance other if ?other,? please specify: _________________________________________________________________________________________________ 4. are there any errors in this document? yes no if ?yes?, please specify (what and where): _________________________________________________________________________________________________ 5. do you have additional recommendations for this document? _________________________________________________________________________________________________ name ________________________________________________________________________________ title ________________________________________________________________________________ company _________________________________________________________________________________________ address _________________________________________________________________________________________ city / state or province / postal code / country ___________________________________________________________ telephone __________________________________ application ________________________________________________________________________________________ would you like a reply? yes no thank you for your feedback. please click the ema il icon in your adobe reader tool bar and send to productsupport@sitime.com . or you may use our online feedback form . |
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