SIT1576 1.2mm 2 power, low - jitter, 1hz C 2.5 mhz super - tcxo features ? 1 hz to 2.5 mhz 5 ppm all - inclusive frequency stability ? factory programmable output frequency ? worlds smallest tcxo footprint: 1.2 mm 2 ? 1.5 x 0.8 mm csp ? no external bypass cap required ? improved stability reduces system power with fewer network tim ekeeping updates ? ultra - low power: 6 a (100 khz) ? supply voltage range: 1.62 v to 3.63 v ? operating temperature ranges: - 20c to +70c, - 40c to +85c ? pb - free, rohs and reach compliant applications ? health and wellness monitors ? smart pens ? ulp input devices ? proprietary wireless ? sensor interface electrical specifications table 1 . electrical characteristics conditions: min/max limits are over temperature, v dd = 1.8v 10%, unless otherwise stat ed. typicals are at 25c and v dd = 1.8 v. parameter symbol min. typ. max. unit condition frequency and stability output frequency f out 1 2.5 m hz total frequency stability [ 1 ] f_stab - 5 5 ppm all inclusive, stability code: e - 20 20 ppm all inclusive, stabi lity code: 1 allan deviation ad 1e - 8 4e - 8 1 second averaging time first year frequency aging f_aging 1 ppm t a = 25c, v dd = 1.8v jitter performance integrated phase jitter ipj 2 3 .5 ns rms f out > 1 khz , integration bandwidth = 100 hz to f out /2. i nclusive of 50 mv peak - to - peak sinusoidal noise on v dd . noise frequency 100 hz to 20 mhz period jitter pj 2.2 4 .5 ns rms cycles = 10,000, f = 100khz. per jedec standard 65b, tested at 100khz . see performance plot for other freq uencies. peak - to - peak perio d jitter pj p - p 20 35 ns p - p supply voltage and current consumption operating supply voltage v dd 1.62 3.63 v no load supply current i dd 3.65 5 a f out = 1 hz 4.5 5.5 f out = 33 khz 6 7 f out = 100 khz 13 16 f out = 1 mhz 33 40 f out = 2 mhz start - up time at power - up t_start 150 300 ms f out > 200 hz. measured when supply reaches 90% of final v dd to the first output pul se and within specified min/max frequency limit. 300 + 2.0 cycles 300 + 2.5 cycles 10 hz < f out 200 hz. measured when supply reaches 90% of final v dd to the first output pul se and within specified min/max frequency limit. 500 + 2.5 cycles 1 hz f out 10 hz. measured when supply reaches 90% of final v dd to the first output pul se and within s pecified min/max frequency limit. operating temperature range operating temperature range op_temp - 20 70 c c ordering code - 40 85 c i ordering code lvcmos output output rise/fall time t r , t f 9 20 ns 20 - 80%, 15 pf load, v dd = 1.8v +/ - 10% output clock duty cycle dc 45 55 % output voltage high voh 90% v dd i oh = - 50 a, 15 pf load output voltage low vol 10% v dd i ol = 50 a, 15 pf load note: 1. i nclu des initial tolerance, over temp stability, 2x reflow, v dd range, board - level under fill , and 20% load variat ion. tested with agilent 53132a frequency counter. measured with 100 ms gate time for accurate frequency measurement. rev. 1.3 march 15, 2018 www.sitime.com
sit157 6 1.2mm 2 power, low - jitter, 1hz C 2.5 mhz super - tcxo rev. 1.3 page 2 of 10 www.sitime.com table 2 . pin configuration t able 3 . absolute maximum ratings attempted operation outside the absolute maximum ratings may caus e permanent damage to the part. actual performance of the ic is only guaranteed within the operational specifications, not at absolute maximum ratings. parameters test conditions value unit continuous power supply voltage range (vdd) - 0.5 to 4.0 v continuous maximum operating temperature range 105 c short duration maximum operating temperature range 30 minutes 125 c human body model (hbm) esd protection jesd22 - a114 2000 v charge - device model (cdm) esd protection jesd22 - c101 750 v machine model (mm) esd protection jesd22 - a115 300 v latch - up tolerance jesd78 compliant mechanical shock resistance mil 883, method 2002 20,000 g mechanical vibration resistance mil 883, method 2007 70 g 1508 csp junction temperature 150 c storage temperature - 65 to 150 c system block diagram figure 2 . SIT1576 block diag ram pin symbol i/o functionality 1 nc internal test no connect. leave floating. pin 1 is for internal testing and is designed to be left floating. 2 clk out out oscillator clock output. 3 vdd power supply operates from nominal su pply voltages between 1.8v and 3.3v. under normal operating conditions, vdd does not require external bypass/decoupling capacitor(s). SIT1576 includes on - chip vdd filtering. 4 gnd power supply ground connect to ground. nc top view figure 1 . pin assignment control temp - to - digital nvm prog prog driver nc v dd gnd g n d v d d c l k o u t c a l / n c 1 4 2 3
sit157 6 1.2mm 2 power, low - jitter, 1hz C 2.5 mhz super - tcxo rev. 1.3 page 3 of 10 www.sitime.com description SIT1576 is an ultra - small and ultra - low power factory programmable tcxo with an output f requency range between 1 hz to 2.5 mhz. sitimes silicon mems technology enables the first 1 hz C 2.5 mhz tcxo in the worlds smallest footprint and chip - scale packaging (cs p). typical supply current is only 6 a (100 khz) . sitime's mems oscillator consists of a mems resonator and a programmable analog circuit. sit15 76 mems resonator is 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 encapsulate s 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 res onator 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 sitime s mems die with a soc, asic, microprocessor or analog die within a package to elim inate external timing components and provide a highly integrated, smaller, cheaper solution to the customer. tcxo frequency stability SIT1576 is factory calibrated (trimmed) over multiple temperature points to guarantee extremely tight stability over tempe rature. unlike quartz crystals that have a classic tuning fork parabola temperature curve with a 25c turnover point with a 0.04 to 0.06 ppm/c 2 temperature coefficient, the SIT1576 temperature coefficient is calibrated and corrected over temperature with an active temperature correction circuit. the result is a 32 khz tcxo with extremely tight frequency variation over the - 40c to +85c temperature range. when measuring the output frequency of SIT1576 with a frequency counter, it is important to make sure the counter's gate time is >100 ms. shorter gate times may lead to inaccurate measurements similarly, the gate time will need to increa se for frequencie s in the 1hz to 500hz frequency range . dynamic temperature frequency response dynamic temperature frequ ency response is the rate of frequency change during temperature ramps. this is an important performance metric when the oscillator is mounted near a high power component (e.g. soc or power management) that may rapidly change the temperature of surrounding components. for moderate temperature ramp rates (<2 c/sec), the dynamic response is primarily determined by the steady - state frequency vs. temperature of the device. the best dynamic response is obtained from parts which have been trimmed to be flat in fr equency over temperature. for high temperature ramp rates (>5 c/sec), the latency in the temperature compensation loop contributes a larger frequency error, which is dependent on the temperature compensation update rate. this part achieves excellent perfor mance at 3 hz update rate. this device family supports faster update rates for further reducing dynamic frequency error at the expense of slightly increased current consumption.
sit157 6 1.2mm 2 power, low - jitter, 1hz C 2.5 mhz super - tcxo rev. 1.3 page 4 of 10 www.sitime.com typical operating curves (t a = 25c, vdd = 1.8v, supply current plots are n o load , unless otherwise stated) figure 3 . frequency stability over temperature figure 4 . start - up and steady - state current profile figure 5 . power supply noise rejection figure 6 . supply current vs temperature (f out = 1 hz) figure 7 . supply current vs temperature (f out = 100 hz) f igure 8 . supply current vs temperature (f out = 100 k hz) 3.3 3.5 3.7 3.9 4.1 4.3 4.5 -40 -20 0 20 40 60 80 100 current (a) temperature ( c) v dd = 3.3v v dd = 1.8v 4 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5 -40 -20 0 20 40 60 80 100 current (a) temperature ( c) v dd = 3.3v v dd = 1.8v 5 5.25 5.5 5.75 6 6.25 6.5 6.75 7 7.25 7.5 7.75 8 -40 -20 0 20 40 60 80 100 current (a) temperature ( c) v dd = 3.3v v dd = 1.8v 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 ) 4 . 5 i n t e r n a l c a p s c h a r g i n g l o g i c s t a r t - u p n v m r e a d o s c s t a r t - u p s t e a d y s t a t e t e m p e r a t u r e c o m p e n s a t i o n ( 1 3 a ) 3 5 0 m s 3 3 k h z n o v d d b y p a s s 1 0 n f v d d b y p a s s f o u t = 3 3 k h z
sit157 6 1.2mm 2 power, low - jitter, 1hz C 2.5 mhz super - tcxo rev. 1.3 page 5 of 10 www.sitime.com figure 9 . supply current vs temperature (f out = 500 k hz) figure 10 . supply current vs temperature (f out = 1 mhz) fig ure 11 . supply current vs temperature (f out = 1.85 mhz) figure 12 . supply current vs temperature (f out = 2 mhz) 9 9.75 10.5 11.25 12 12.75 13.5 14.25 15 15.75 16.5 17.25 18 -40 -20 0 20 40 60 80 100 current (a) temperature ( c) v dd = 3.3v v dd = 1.8v 10 11.5 13 14.5 16 17.5 19 20.5 22 23.5 25 26.5 28 29.5 31 32.5 -40 -20 0 20 40 60 80 100 current (a) temperature ( c) v dd = 3.3v v dd = 1.8v 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 -40 -20 0 20 40 60 80 100 current (a) temperature ( c) v dd = 3.3v v dd = 1.8v 25 28 31 34 37 40 43 46 49 52 55 58 61 64 -40 -20 0 20 40 60 80 100 current (a) temperature ( c) v dd = 1.8v v dd = 3.3v
sit157 6 1.2mm 2 power, low - jitter, 1hz C 2.5 mhz super - tcxo rev. 1.3 page 6 of 10 www.sitime.com dynamic frequency response for moderate temperature ramps frequency accuracy under a moderate temperature ramp up to 2c/sec is limited by the tcxos trimmed accuracy of the frequency stability over - temperature. note: 2. measured relative to 32.768 khz.
sit157 6 1.2mm 2 power, low - jitter, 1hz C 2.5 mhz super - tcxo rev. 1.3 page 7 of 10 www.sitime.com dynamic frequency response for fast temperature ramps for temperature ramps >5c/sec, the frequency accuracy is limited by the update rate of the temperature compensation path (see the 5c/sec and 10c/sec plots). contact sit ime for applications that require improved dynamic performance. note: 3. referenced to 32.768 khz. 5 c / s e c t e m p r a m p f r e q u e n c y r e s p o n s e ~ 5 c / s e c 3 h z t e m p c o m p r e f r e s h r a t e [ 3 ] 1 0 c / s e c t e m p r a m p f r e q u e n c y r e s p o n s e ~ 1 0 c / s e c 3 h z t e m p c o m p r e f r e s h r a t e [ 3 ]
sit157 6 1.2mm 2 power, low - jitter, 1hz C 2.5 mhz super - tcxo rev. 1.3 page 8 of 10 www.sitime.com dimensions and patterns package size C dimensions (unit: mm) recommended land pattern (unit: mm) recommended 4 - mil (0.1mm ) stencil thickness manufacturing guidelines 1) no ultrasonic or megasonic cleaning: do not subject SIT1576 to an ultrasonic or megasonic cleaning environment. permanent damage or long term reliability issues may occur. 2) applying board - level underfill and ove rmold is acceptable and will not impact the reliability of the device. 3) reflow profile, per jesd22 - a113d. 4) the SIT1576 csp includes a protective, opaque polymer top - coat. if the SIT1576 will see intense light, especially in the 1.0 - 1.2 m ir spectrum, we reco mmend a protective glob - top epoxy or other cover to keep the light from negatively impacting the frequency stability. 5) for additional manufacturing guidelines and marking/tape - reel instructions, refer to sitime manufacturing notes . # 1 # 2 # 4 # 3 ( s o l d e r m a s k o p e n i n g s s h o w n w i t h d a s h e d l i n e a r o u n d n s m d p a d )
sit157 6 1.2mm 2 power, low - jitter, 1hz C 2.5 mhz super - tcxo rev. 1.3 page 9 of 10 www.sitime.com ordering information s i t 1 5 7 6 a i - j e - x x e - x x x x . x x x x x x q p a r t f a m i l y s i t 1 5 7 6 r e v i s i o n l e t t e r 3 $ : i s t h e r e v i s i o n t e m p e r a t u r e r a n g e c : e x t e n d e d c o m m e r c i a l , - 2 0 t o 7 0 o c i : l n d u s t r i a l , - 4 0 t o 8 5 o c p a c k a g i n g s a m p l e s i n c u t t a p e p a c k a g e s i z e s : 8 m m t a p e & r e e l , 1 0 k u r e e l q : 8 m m t a p e & r e e l , 5 k u r e e l e : 8 m m t a p e & r e e l , 1 k u r e e l j : 1 . 5 m m x 0 . 8 m m c s p a l l - i n c l u s i v e o v e r t e m p s t a b i l i t y e : 5 p p m 1 : 2 0 p p m s u p p l y v o l t a g e x x = 1 . 8 v C 3 . 3 v 1 . 8 v = 1 8 2 . 0 v = 2 0 2 . 5 v = 2 5 3 . 0 v = 3 0 3 . 3 v = 3 3 o u t p u t f r e q u e n c y 2 5 0 0 . 0 0 0 0 0 0 = 2 . 5 m h z 1 8 5 0 . 0 0 0 0 0 0 = 1 . 8 5 m h z 0 5 1 2 . 2 8 8 0 0 0 = 5 1 2 . 2 8 8 k h z 0 0 1 0 . 0 0 0 0 0 0 = 1 0 . 0 k h z 0 0 0 4 . 0 9 6 0 0 0 = 4 . 0 9 6 0 k h z 0 0 0 0 . 1 0 0 2 5 6 = 1 0 0 . 2 5 6 h z 0 0 0 0 . 0 1 0 0 0 0 = 1 0 . 0 h z 0 0 0 0 . 0 0 1 0 0 0 = 1 . 0 h z 0 0 0 0 . 0 0 1 1 0 0 = 1 . 1 0 h z 0 0 0 0 . 0 0 5 1 2 3 = 5 . 1 2 3 h z e n t e r y o u r d e s i r e d f r e q u e n c y a s s h o w n b e l o w : c o n t i n u o u s f r e q u e n c y o p t i o n s f r o m 1 h z t o 2 . 5 m h z
sit157 6 1.2mm 2 power, low - jitter, 1hz C 2.5 mhz super - tcxo rev. 1.3 page 10 of 10 www.sitime.com table 4 . revision history version release date change summary 0.25 0 1/13/ 20 16 initial release of advanced datasheet 0.5 03 / 10 /2016 prelimin ary datasheet initial release 0.9 0 2/15/2017 update d package outline drawing (pod) updated part number ordering information updated max programmable frequency updated logo and company address, other page layout changes 1.0 05/09 /2017 final release updat ed supply current vs frequency updated start - up time 1.1 06/12/2017 updated max operating frequency to 2.0 mhz 1.2 08/03 /2017 added additional typical operating curves updated t yp ical no load supply current ( table 1 ) 1.3 03/15/2018 updated max operating frequency from 2.0mhz to 2.5mhz sitim e corp or ati on , 5451 patrick henry drive , santa clara , ca 95054 , usa | phone: + 1 - 408 - 328 - 4400 | fax: +1 - 408 - 328 - 4439 ? sitime corporation 2016 - 201 8 . 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 produc t, (ii) misuse or abuse including static discharge, neglect or accident, (iii) unauthorized modification or repairs which have been soldered or alte red during assembly and are not capable of being tested by sitime under its normal test conditions, or (iv) improp er installation, storage, handling, warehousing or transportation, or (v) being subjected to unusual physical, thermal, or el ectrical stress. disclaimer: sitime makes no warranty of any kind, express or implied, with regard to this material, and specifica lly disclaims any and all 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 particular purpose, and any implied warranty arising from c ourse 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 use d 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 belo w. 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 l ife 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 sitim e, any reproduction, modification, translation, compilation, or representation of this material shall be strictly prohibited.
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