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SIT1533 20 ppm, ultra - low power 32.768 khz quartz xtal replacement smallest (1.2mm 2 ), ultra - low power, 32.768 khz mems tcxo features ? small smd package: 2.0 x 1.2 mm (2012) [ 1 ] ? pin - compatible to 2012 xtal smd package ? fixed 32.768 khz output frequency ? <20 ppm frequency tolerance ultra - low power: <1 a ? supports coin - cell or super - cap battery backup voltages ? vdd suppl y range: 1.5v to 3.63v over - 40c to +85c ? oscillator output eliminates external load caps ? internal filtering eliminates external vdd bypass cap ? nanodrive? progr ammable output swing for lowest power ? pb - free, rohs and reach compliant applications ? mobile phones ? tablets ? health and wellness monitors ? fitness watches ? sport video cams ? wireless keypads ? ultra - small notebook pc ? pulse - per - second (pps) timekeeping ? rtc reference clock ? battery management timekeeping note: 1. for the smallest 32 khz xo in csp (1.2 mm 2 ), consider the sit1532 . electrical specifications table 1 . electrical characteristics parameter symbol min. typ. max. unit condition frequency and stability fixed output frequency fout 32.768 khz frequency stability frequency tolerance [ 2 ] f_tol 20 ppm t a = 25c, post reflow, vdd: 1.5v C 3.63v. frequency stability [ 3 ] f_stab 75 ppm t a = - 10c to +70c, vdd: 1.5v C 3.63v. 100 t a = - 40c to +85c, vdd: 1.5v C 3.63v. 250 t a = - 10c to +70c, vdd: 1.2v C 1.5v. 25c aging - 1 1 ppm 1 st year supply voltage and current consumption operating supply voltage vdd 1.2 3.63 v t a = - 10c to +70c 1.5 3.63 v t a = - 40c to +85c core operating current [ 4 ] idd 0.90 a t a = 25c, vdd: 1.8v. no load 1.3 t a = - 10c to +70c, vdd max: 3.63v. no load 1.4 t a = - 40c to +85c, vdd max: 3.63v. no load output stage operating current [ 4 ] idd_out 0.065 0.125 a/vpp t a = - 40c to +85c, vdd: 1.5v C 3.63v. no load power - supply ramp t_vdd_ ramp 100 ms t a = - 40c to +85c, 0 to 90% vdd start - up time at power - up [ 5 ] t_start 180 300 ms t a = - 40c t a +50c, valid output 450 t a = +50c < t a +85c, valid output operating temperature range commercial temperature t_use - 10 70 c industrial temperature - 40 85 c notes: 2. measured peak - to - peak. tested with agilent 53132a frequency counter. due to the low operating frequency, the gate time must be 100 ms to ensure an accurate frequency measurement. 3. stability is specified for two operating voltage ranges. stability progressively degrades with supply voltage below 1.5v. measured peak - to - peak. inclusive of initial tolerance at 25c, and variations over operating temperature, rated power supply voltage and load. 4. core operating current does not include output driver operating current or load current. to derive total operating current (no load), add core operating current + (0.065 a/v) * (peak - to - peak output voltage swing). 5. measured from the time vdd reaches 1.5v. rev 1.4 march 20, 2018 www.sitime.com
si t1533 20 ppm, ultra - low power 32.768 khz quartz xtal replacement rev 1.4 page 2 of 13 www.sitime.com table 1 . electrical characteristics (continued) parameter symbol min. typ. max. unit condition lvcmos output option, t a = - 40c to +85c, typical values are at t a = 25c output rise/fall time tr, tf 100 200 ns 10 - 90% (vdd), 15 pf load, vdd = 1.5v to 3.63v 50 10 - 90% (vdd), 5 pf load, vdd 1.62v output clock duty cycle dc 48 52 % output voltage high voh 90% v vdd: 1.5v C 3.63v. i oh = - 10 a, 15 pf output voltage low vol 10% v vdd: 1.5v C 3.63v. i ol = 10 a, 15 pf nanodrive? programmable, reduced swing output output rise/fall time tf, tf 200 ns 30 - 70% (v ol /v oh ), 10 pf load output clock duty cycle dc 48 52 % ac - coupled programmable output swing v_sw 0.20 to 0.80 v SIT1533 does not internally ac - couple. this output description is intended for a receiver that is ac - coupled. see table 2 for acceptable nanodrive swing options. vdd: 1.5v C 3.63v, 10 pf load, i oh / i ol = 0.2 a. dc - biased programmable output voltage high range voh 0.60 to 1.225 v vdd: 1.5v C 3.63v. i oh = - 0.2 a, 10 pf load. see table 1 for acceptable v oh /v ol setting levels. dc - biased programmable output voltage low range vol 0.35 to 0.80 v vdd: 1.5v C 3.63v. i ol = 0.2 a, 10 pf load. see table 1 for acceptable v oh /v ol setting levels. programmable output voltage swing tolerance - 0.055 0.055 v t a = - 40c to +85c, vdd = 1.5v to 3.63v. period jitter t_jitt 35 ns rms cycles = 10,000, t a = 25c, vdd = 1.5v C 3.63v table 2 . pin configuration smd pin symbol i/o f unctionality 1 nc no connect no connect. will not respond to any input signal. when interfacing to an mcus xtal input pins, this pin is typically connected to the receiving ics x out pin. in this case, the SIT1533 will not be affected by the signal on this pin. if not interfacing to an xtal oscillator, leave pin 1 floating (no connect). 2 gnd power supply ground con nect to ground. all gn d pins must be connected to power supply ground. 3 clk out out oscillator clock output. when interf acing to an mcus xtal, the clk out is typically connected to the receiving ics x in pin. the SIT1533 oscillator output includes an internal driver. as a result, the output swing and operation is not dependent on capacitive loading. this makes the output much more flexible, layout independent, and robust under changing environmental and manufacturing conditions. 4 vdd power supply connect to power supply 1.5v vdd 3.63v for operation over - 40c to +85c temperature range. under normal operating conditions, vdd does not require external bypass/decoupling capacitor(s). internal power supply filte ring will reject more than 150 mvp p with frequency components through 10 mhz. contact sitime for applications that require a wider operating supply voltage range. smd package (top view) figure 1 . pin assignments vdd gnd clk out nc 1 4 3 2
si t1533 20 ppm, ultra - low power 32.768 khz quartz xtal replacement rev 1.4 page 3 of 13 www.sitime.com system block diagram figure 2 . s i t15 33 block diagram table 3 . absolute maximum limits attempted operation outside the absolute maximum ratings may cause permanent damage to the part. actual performance of the ic is only guaranteed within the operational specifications, not at absolute maximu m ratings. parameter test condition value unit continuous power supply voltage range (vdd) - 0.5 to 3.63 v short duration maximum power supply voltage (vdd) 30 minutes, over - 40c to +85c 4.0 v continuous maximum operating temperature range vdd = 1.5v - 3.63v 105 c short duration maximum operating temperature range vdd = 1.5v - 3.63v, 30 mins 125 c human body model esd protection hbm, jesd22 - a114 3000 v charge - device model (cdm) esd protection jesd220c101 750 v machine model (mm) esd protection t a = 25c 300 v latch - up tolerance jesd78 compliant mechanical shock resistance mil 883, method 2002 10,000 g mechanical vibration resistance mil 883, method 2007 70 g 2012 smd junction temperature 150 c storage temperature - 65c to 150c u l t r a - l o w p o w e r p l l s u s t a i n i n g a m p r e g u l a t o r s v d d g n d c l k o u t p r o g d i v i d e r n c m e m s r e s o n a t o r p r o g c o n t r o l t r i m u l t r a - l o w p o w e r d r i v e r
si t1533 20 ppm, ultra - low power 32.768 khz quartz xtal replacement rev 1.4 page 4 of 13 www.sitime.com description the SIT1533 is an ultra - small and ultra - low power 32.768 khz oscillator optimized for mobile and other battery - powered applications. the SIT1533 is pin - compatible and footprint compatible to existing 2012 xtals when using the sitime solder - pad layout (spl). and unlike standard oscillators, the SIT1533 features nanodrive?, a factory programmable output that reduces the voltage swing to minimize power. the 1.2v to 3.63v operating supply voltage range makes it an ideal solution for mobile applications that incorporate a low - voltage, battery - back - up source such as a coin - cell or super - cap. sitime s mems oscillators consist of mems resonators and a programmable analog circuit. our mems resonators are built with sitimes unique mems first? process. a key manufacturing step is episeal? during which the mems resonator is annealed with temperatures over 1000c. episeal creates an extremely strong, clean, vacuum chamber that encapsulates the mems resonator and ensures the best performance and reliability. during episeal, a poly silicon cap is grown on top of the resonator cavity, which eliminates the need for additional cap wafers or other exotic packaging. as a result, sitimes mems resonator die can be used like any other semiconductor die. one unique result of sitimes mems first and episeal manufacturing processes is the capability to integrate sitimes mems die with a soc, asic, microprocessor or analog die within a package to eliminate external timing components and provide a highly integrated, smaller, cheaper solution to the customer. xtal footprint compatibility (smd package) the SIT1533 is a replacement to the 32 khz xtal in the 2.0 x 1.2 mm (2012) package. unlike xtal resonators, sitimes silicon mems oscillators require a power supply (vdd) and ground (gnd) pin. vdd and gnd pins are conveniently placed between the two large xtal pins. when u sing the sitime solder pad layout (spl), the SIT1533 footprint is compatible with existing 32 khz xtals in the 2012 smd package . figure 3 shows the comparison between the quartz xtal footprint and the sitime footprint. for applications that require the smallest footprint solution, consider the sit1532 xo available in a 1.2mm 2 csp. figure 3 . SIT1533 footprint compatibility with quartz xtal footprint [ 6 ] note: 6. on the sitime device, x in is not internally connected and will not respond to any signal. it is acceptable to connect to chipset x out. frequency stability the SIT1533 is factory calibrated (trimmed) to guarantee frequency stability to be less than 20 ppm at room temperature and less than 100 ppm over the full - 40c to +85c temper ature range. unlike quartz crystals that have a classic tuning fork parabola temperature curve with a 25c turnover point, the SIT1533 temperature coefficient is extremely flat across temperature. the device maintains less than 100 ppm frequency stability over the full operating temperature range when the operating voltage is between 1.5 and 3.63v as shown in figure 4 . functionality is guaranteed over the 1.2v C 3.63v operating supply voltage range. however, frequency stability degrades below 1.5v and steadily degrades as it approaches the 1.2v minimum sup ply due to the internal regulator limitations. between 1.2v and 1.5v, the frequency stability is 250 ppm max over temperature. when measuring the SIT1533 output frequency with a frequency counter, it is important to make sure the counter's gate time is >10 0ms. the slow frequency of a 32 khz clock will give false readings with faster gate times. contact sitime for alternative 32 khz product options and applications that require a wider supply voltage r ange >3.63v, or operating frequency below 32 khz. figure 4 . sitime vs. quartz power supply noise immunity the SIT1533 is an ultra - small 32 khz oscillator. in addition to eliminating external output load capacitors common with standard xtals, this device includes special power supply filtering and thus, eliminates the need for an external vdd bypass - decoupling capacitor. this feature further simplifies the design and keeps the footprint as small as possib le. internal power supply filtering is designed to reject ac - noise greater than 150 mvpp magnitude and beyond 10 mhz frequency component. output voltage the SIT1533 has two output voltage options. one option is a standard lvcmos output swing. the second option is the nanodrive reduced swing output. output swing is customer specific and programmed between 200 mv and 800 mv. for dc - coupled applications, output voh and vol are individually f a ctory programmed to the customers q u a r t z s i t i m e x o u t x i n c o n n e c t t o x o u t o r n c c l o c k o u t c o n n e c t t o x i n g n d v d d t o p v i e w t o p v i e w 1 2 4 3 q u a r t z x t a l - 1 6 0 t o - 2 2 0 p p m o v e r t e m p s i t 1 5 3 x i n d u s t r i a l t e m p s p e c i f i c a t i o n s i t 1 5 3 3 m e a s u r e d s i t 1 5 3 3 2 0 p p m m a x @ 2 5 c t e m p e r a t u r e ( c ) f r e q u e n c y s t a b i l i t y ( p p m )
si t1533 20 ppm, ultra - low power 32.768 khz quartz xtal replacement rev 1.4 page 5 of 13 www.sitime.com requirement. voh programming range is between 600 mv and 1.225v in 100 mv increments. similarly, vol programming range is between 350 mv and 800 mv. for example; a pmic or mcu is internally 1.8v logic compatible, and requires a 1.2v vih and a 0.6v vil. simply select SIT1533 nanodrive factory programming code to be d14 and the correct output thresholds will match the downstream pmic or mcu input requirements. interface logic will vary by manufacturer and we recommend that you review the input voltage requirements for the input interface. for dc - biased nanodrive output configuration, the minimum vol is limited to 350mv and the maximum allowable swing (voh - vol) is 750mv. for example, 1.1v voh and 400mv vol is acceptab le, but 1.2v voh and 400 mv vol is not acceptable. when the output is interfacing to an xtal input that is internally ac - coupled, the SIT1533 output can be factory programmed to match the input swing requirements. for example, if a pmic or mcu input is int ernally ac - coupled and requires an 800mv swing, then simply choose the SIT1533 nanodrive programming code aa8 in the part number. it is important to note that the SIT1533 does not include internal ac - coupling capacitors. please see the part number ordering section at the end of the datasheet for more information about the part number ordering scheme. power - up the SIT1533 starts - up to a valid output frequency within 300 ms (150ms typ). to ensure the de vice starts - up within the specified limit, make sure the power - supply ramps - up in approximately 10 C 20 ms (to within 90% of vdd). start - up time is measured from the time vdd reaches 1.5v. for applications that operate between 1.2v and 1.5v, th e start - up t ime will be longer.
si t1533 20 ppm, ultra - low power 32.768 khz quartz xtal replacement rev 1.4 page 6 of 13 www.sitime.com SIT1533 nanodrive? figure 5 shows a typical SIT1533 output waveform (into a 10 pf load) when factory programmed for a 0.70v swing and dc bias (v oh /v ol ) for 1.8v logic: example: ? nanodrive? part number coding: d14 . example part number: sit15 3 3ai - h4 - d14 - 32.768 ? v oh = 1.1v, v ol = 0.4v (v sw = 0.70v) figure 5 . SIT1533ai - h4 - d14 - 32.768 table 4 shows the supported nanodrive? v oh , v ol factory programming options. table 4 . acceptable v oh /v ol nanodrive? levels nanodrive v oh (v) v ol (v) swing (mv) comments d26 1.2 0.6 600 55 1.8v logic compatible d14 1.1 0.4 700 55 1.8v logic compatible d74 0.7 0.4 300 55 xtal compatible aa3 n/a n/a 300 55 xtal compatible the values listed in table 4 nominal values at 25c and will exhibit a tolerance of 55 mv across vdd and - 40c to 85c operating temperature range. SIT1533 full swing lvcmos output the SIT1533 can be factory programmed to generate full - swing lvcmos levels. figure 6 shows the typical lvcmos waveform (vdd = 1.8v) at room temperature into a 15 pf load. figure 6 . lvcmos waveform (vdd = 1.8v) into 15 pf load example: ? lvcmos output part number coding is always dcc ? example part number: SIT1533ai - h4 - dcc - 32.768 v o h = 1 . 1 v v s w = 0 . 7 v v o l = 0 . 4 v
si t1533 20 ppm, ultra - low power 32.768 khz quartz xtal replacement rev 1.4 page 7 of 13 www.sitime.com calculating load current no load supply current when calculating no - load power for th e SIT1533, the core and output driver components need to be added. since the output voltage swing can be programmed for reduced swing between 300 mv and 700 mv, the output driver current is variable. therefore, no - load operating supply current is broken in to two sections; core and output driver. the equation is as follows: total supply current (no load) = idd core + (65na/v)(voutpp) example 1: full - swing lvcmos ? vdd = 1.8v ? idd core = 900na (typ) ? voutpp = 1.8v (lvcmos) ? supply current = 900na + (65na/v)(1.8v) = 1017na example 2: nanodrive? reduced swing ? vdd = 1.8v ? idd core = 900na (typ) ? voutpp (d14) = v oh C v ol = 1.1v C 0.4v = 700mv ? supply current = 900na + (65na/v)(0.7v) = 946na total supply current with load to calculate the total supply current, including the load, follow the equation listed below. note the 27% reduction in power with a 1.8v logic compatible nanodrive? output voltage. total current = idd core + idd output driver (65na/v *vo utp p) + + load current (c*v*f) example 1: full - swing lvcmos ? vdd = 1.8v ? idd core = 900na ? load capacitance = 10pf ? idd output driver: (65na/v)(1.8v) = 117na ? load current: (10pf)(1.8v)(32.768khz) = 590na ? total current = 900na+117na+590na = 1.6a example 2: nanodrive? reduced swing ? vdd = 1.8v ? idd core = 900na ? load capacitance = 10pf ? voutpp (d14): v oh C v ol = 1.1v C 0.4v = 700mv ? idd output driver: (65na/v)(0.7v) = 46na ? load current: (10pf)(0.7v)(32.768khz) = 229na total current = 900na + 46na + 229na = 1.175a
si t1533 20 ppm, ultra - low power 32.768 khz quartz xtal replacement rev 1.4 page 8 of 13 www.sitime.com typical operating curves (t a = 25c, vdd = 1.8v, unless otherwise stated) figure 7 . frequency stability over temperature (pre - reflow) figure 9 . core current over temperature figure 8. frequency stability over temperature figure 10 . output stage current over temperature figure 11 . start - up time temperature (c) t i me ( s e c) initial tolerance (ppm) t a = 25 c post reflow, no underfill number of devices frequency stability (ppm) output stage current (na/vpp) voltage (v) core current (ua) temperature (c)
si t1533 20 ppm, ultra - low power 32.768 khz quartz xtal replacement rev 1.4 page 9 of 13 www.sitime.com figure 1 2 . power supply noise rejection (150mv noise) figure 1 3 . nanodrive? output waveform (v oh = 1.1v, v ol = 0.4v; SIT1533ai - h4 - d14 - 32.768) figure 1 4 . lvcmos output waveform (v swing = 1.8v, SIT1533ai - h4 - dcc - 32.768) f r e q u e n c y e r r o r ( p p m ) n o i s e i n j e c t i o n f r e q u e n c y ( h z ) v o h = 1 . 1 v v s w = 0 . 7 v v o l = 0 . 4 v
si t1533 20 ppm, ultra - low power 32.768 khz quartz xtal replacement rev 1.4 page 10 of 13 www.sitime.com dimensions and patterns package size C dimensions (unit: mm) [ 7 ] recommended land pattern (unit: mm) 2.0 x 1.2 mm smd sitime only spl sitime alternate spl with larger center pads xtal compatible spl note : 7. 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. # 1 # 2 # 3 # 4 # 3 # 1 # 4 # 2 0 . 3 ( 2 x ) 0 . 4 ( 2 x ) 0 . 5 5 0 . 4 0 . 6 5 0 . 5 ( 2 x ) 1 . 4 ( 2 x ) 1 . 2 2 . 0 0 . 5 ( 2 x )
si t1533 20 ppm, ultra - low power 32.768 khz quartz xtal replacement rev 1.4 page 11 of 13 www.sitime.com manufacturing guidelines 1) no ultrasonic cleaning: do not subject the SIT1533 to an ultrasonic cleaning environment. permanent damage or long term reliability issues to the mems structure may occur. 2) for noisy, high em environments, we recommend the following design guidelines: ? place oscillator as far away from em noise sources as possible (e.g., high - voltage switching regulators, motor drive control). ? route noisy pcb traces, such as digital data lines or high di/dt power supply lines, away from the sitime osc illator. ? add a low esr/esl, 0.1uf to 1.0uf ceramic capacitor (x7r) to help filter high frequency noise on the vdd power - supply line. place it as close to the sitime oscillator vdd pin as possible. ? place a solid gnd plane underneath the sitime oscillator to shield the oscillator from noisy traces on the other board layers. ? for details, please refer to the pcb layout guidelines in an10006 . 3) for add itional manufacturing guidelines and marking/tape - reel instructions, refer to sitime manufacturing notes .
si t1533 20 ppm, ultra - low power 32.768 khz quartz xtal replacement rev 1.4 page 12 of 13 www.sitime.com ordering information part number characters in blue represent the customer specific options. the other characters in the part number are fixed. here are guidelines to select the correct output voltage. these are only suggestions and specific chipsets may require different output voltage settings. 1) for xtal replacement applications that will keep the chipset oscillator enabled, configure the nanodrive? output for a swing similar to the xtal, approximately 300 mv. SIT1533ai - h4 - aa3 - 32.768 2) for xtal replacement applications that will disable the chipset oscillator, configure the output with one of the following: ? for vdd = 1.8v: SIT1533ai - h4 - d14 - 32.768 ? for vdd > 1.8v: SIT1533ai - h4 - dcc - 32.768 the following examples illustrate how to select the appropriate temp range and output voltage requirements: example 1: SIT1533ai - h4 - d14 - 32.768 ? industrial temp & corresponding 100 ppm frequency stability. note, 100 ppm is only available for the industrial temp range, and 75 ppm is only available for the commercial temp range. ? output swing requirements: a) d = dc - coupled receiver b) 1 = v oh = 1.1v c) 4 = v ol = 0.4v example 2: SIT1533ac - h5 - aa2 - 32.768 ? commercial temp & corresponding 75 ppm frequency stability. note, 100 ppm is only available for the industrial temp range, and 75 ppm is only available for the commercial temp range. ? output swing requirements: a) a = ac - coupled receiver b) a = ac - coupled receiver c) 3 = 300 mv swing table 5 . acceptable v oh /v ol nanodrive? levels [ 8 ] nanodrive v oh (v) v ol (v) swing (mv) comments d26 1.2 0.6 600 55 1.8v logic compatible d14 1.1 0.4 700 55 1.8v logic compatible d74 0.7 0.4 300 55 xtal compatible aa3 n/a n/a 300 55 xtal compatible note: 8. if these available options do not accommodate your application, contact factory for other nanodrive options.
si t1533 20 ppm, ultra - low power 32.768 khz quartz xtal replacement rev 1.4 page 13 of 13 www.sitime.com table 6 . revision history version release date change summary 1.0 09/02/2014 rev 0.9 preliminary to rev 1.0 production release updated start - up time specification added typical operating plots removed sot23 package option relabeled 25 c frequency spec as frequency tolerance added manufacturing guidelines section 1.1 10/14/2014 improved start - up time at power - up spec added 5pf lvcmos rise/fall time spec 1.2 11/25/2014 updated 5pf lvcmos rise/fall time spec added additional design - in/mfg guidelines 1.3 01/18/2018 added 2nd landing pattern option updated nanodrive section updated logo and company address, other page layout changes 1.4 03/20/2018 corrected an error of the p in assignments in figure 1 sitime corporation , 5451 patrick henry drive , santa clara , ca 95054 , usa | phone: + 1 - 408 - 328 - 4400 | fax: +1 - 408 - 328 - 4439 ? sitime corporation 2014 - 201 8 . the information contained herein is subject to change at any time without notice. sitime assumes no responsibility or liabi lity 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 produc t, (ii) misuse or abuse including static discharge, neglect or accident, (iii) unauthorized modification or repairs which have bee n soldered or alte red 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 electrical 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, inc luding the implied warranties of merchantability and fitness for use or a particular 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 component, 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 nuclear facilities or for use in other mission - critical applications or components 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, firmware, 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 documents, 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, translation, compilation, or representation of this material shall be strictly prohibited.

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