SIT1566 1.2mm 2 power, low - jitter, 3 & 5 ppm, 32.768 khz super - tcxo smallest (1.2mm 2 ), ultra - low power, 32.768 khz mems tcxo features applications ? 32.768 khz 3 and 5 ppm all - inclusive frequency stability ? 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 timekeeping updates ? low integrated phase jitter (ipj) suitable for multiplying up for portable audio: 2.5 ns rms ? ultra - low power: 4.5 a ? operating supply voltage range: 1.62 v t o 3.63 v ? operating temperature ranges: - 20c to +70c, - 40c to +85c ? pb - free, rohs and reach compliant ? smart watches, health and wellness monitors ? ultra - accurate rtc reference clock ? smart utility meters, e - meters ? internet - of - things (iot) with ble electrical specifications conditions: min/max limits are over temperature, vdd = 1.8v 10%, unless otherwise stated. typicals are at 25c and vdd = 1.8 v. table 1 . electrical characteristics parameter symbol min. typ. max. unit condition frequency and stability output frequency fout 32.768 khz total frequency stability [1] f_stab - 3 3 ppm all inclusive - 5 5 allan deviation ad 1e - 8 4e - 8 1 second averaging time first year frequency aging f_aging 1 ppm t a = 25c, vdd = 1.8v jitter and frequency response performance integrated phase jitter ipj 1.8 2.5 ns rms integration bandwidth = 100 hz to 16.384 khz. inclusive of 50 mv peak - to - peak sinusoidal noise on vdd. noise frequency 100 hz to 20 mhz. rms period jitter pj rms 2.5 4 ns rms 10,000 samples, per jedec standard 65b peak - to - peak period jitter pj p - p 20 35 ns p - p dynamic temperature frequency response - 0.5 +0.5 ppm/sec under temp ramp up to 1.5c/sec supply voltage and current consumption operating supply voltage vdd 1.62 1.8 1.98 v 1.62 3.63 supply current idd 4.5 5.3 a no load start - up time at power - up t_start 300 ms measured when supply reaches 90% of final vdd to the first output pulse. 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 tr, tf 9 20 ns 10 C 90% vdd, 15pf load output clock duty cycle dc 45 55 % output voltage high voh 90% vdd i oh = - 50 a, 15 pf load output voltage low vol 10% vdd i ol = 50 a, 15 pf load note: 1. relative to 32.768 khz, includes initial tolerance, over temp stability, vdd, 20% load variation, hysteresis, board - level underfill (5ppm only), 2x reflow. tested with agilent 53132a frequency counter. measured with 100 ms gate time for accurate frequency measurement. rev 1.0 january 18, 2018 www.sitime.com
SIT1566 1.2mm 2 power, low - jitter, 3 & 5 ppm, 32.768 khz super - tcxo rev 1.0 page 2 of 9 www.sitime.com table 2 . pin configuration table 3 . absolute maximum ratings 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 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 t a = 25c 200 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 . sit156 6 block diagram pin symbol i/o functionality 1 nc internal test leave floating. do not connect to gnd. 2 clk out out oscillator clock output. lvcmos compatible logic. 3 vdd power supply 1.8v 10% power supply. under normal operating conditions, vdd does not require external bypass/decoupling capacitor(s). SIT1566 includes on - chip filtering capacitors. under extreme noise on the supply, a 10 - 100 nf low esr ceramic bypass capacitor may be recommended close to the vdd pin. 4 gnd power supply ground connect to ground. nc csp package (top view) figure 1 . pin assignment g n d v d d c l k o u t c a l / n c 1 4 2 3 u l t r a - l o w p o w e r f r a c - n 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 d r i v e r v d d n c g n d p r o g d i v i d e r g n d 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 e m p c o n t r o l t e m p - t o - d i g i t a l n v m
SIT1566 1.2mm 2 power, low - jitter, 3 & 5 ppm, 32.768 khz super - tcxo rev 1.0 page 3 of 9 www.sitime.com description SIT1566 is an ultra - small, micro - power 32.768 khz tcxo optimized for battery - powered applications. sitimes silicon mems technology enables the first 32 khz tcxo in the worlds smallest footprint and chip - scale packaging (csp). typical supply current is 4.5 a under no load condition. sitime 's mems oscillator consists of a mems resonator and a programmable analog circuit. SIT1566 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 encapsulates the mems resonator and e nsures 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 lik e 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 compon ents and provide a highly integrated, smaller, cheaper solution to the customer. tcxo frequency stability SIT1566 is factory calibrated (trimmed) over multiple temperature points to guarantee extremely tight stability over temperature. unlike quartz crysta ls that have a classic tuning fork parabola temperature curve with a 25c turnover point with a 0.04 ppm/c2 temperature coefficient, the SIT1566 temperature coefficient is calibrated and corrected over temperature with an active temperature correction circ uit. 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 SIT1566 with a frequency counter, it is important to make sure the counter's gate time is >100 ms. s horter gate times may lead to inaccurate measurements. dynamic temperature frequency response dynamic temperature frequency response is the rate of frequency change during temperature ramps. this is an important performance metric when the oscillator is m ounted 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 (<2c/sec), the dyn amic 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 frequency over temperature. for high temperature ramp rates (>5c/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 performance at the default 3hz refresh update rate. this device family supports faster upda te rates for further reducing dynamic frequency error at the expense of slightly increased current consumption. other compensation refresh rate options include 6 hz, 12 hz, and 24 hz. contact sitime for other options.
SIT1566 1.2mm 2 power, low - jitter, 3 & 5 ppm, 32.768 khz super - tcxo rev 1.0 page 4 of 9 www.sitime.com typical operating curves (t a = 25c, vdd = 1.8v, unless otherwise stated) figure 3 . frequency stability over temperature figure 4 . supply current over temperature (no load) figure 5 . start - up and steady - state current profile figure 6 . power supply noise rejection (psnr) figure 7 . lvcmos output sing 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
SIT1566 1.2mm 2 power, low - jitter, 3 & 5 ppm, 32.768 khz super - tcxo rev 1.0 page 5 of 9 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. [ 2 ]
SIT1566 1.2mm 2 power, low - jitter, 3 & 5 ppm, 32.768 khz super - tcxo rev 1.0 page 6 of 9 www.sitime.com dynamic frequency response for fast temperature ramps for temperature ramps > 5 c/sec, the freque ncy accuracy is limited by the update rate of the temperature compensation path (see the 5c/sec and 10c/sec plots). contact sitime for applications that require improved dynamic performance. note: 3. measured relative 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 ]
SIT1566 1.2mm 2 power, low - jitter, 3 & 5 ppm, 32.768 khz super - tcxo rev 1.0 page 7 of 9 www.sitime.com dimensions and patterns package size C dimensions (unit: mm) recommend ed land pattern (unit: mm) recommended 4 - mil (0.1mm) stencil thickness manufacturing guidelines 1) no ultrasonic or megasonic cleaning: do not subject SIT1566 to an ultrasonic or megasonic cleaning environment. permanent damage or long term reliability issues may occur. 2) applying board - level underfill and overmold is acceptable and will not impact the reliability of the device. 3) r eflow profile, per jesd22 - a113d. 4) the SIT1566 csp includes a protective, opaque polymer top - coat. if the SIT1566 will see intense light, especially in the 1.0 - 1.2 m ir spectrum, we recommend a protective glob - top epoxy or other cover to keep the light fro m negatively impacting the frequency stability. 5) for additional manufacturing guidelines and marking/tape - reel instructions, refer to: siti me 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 )
SIT1566 1.2mm 2 power, low - jitter, 3 & 5 ppm, 32.768 khz super - tcxo rev 1.0 page 8 of 9 www.sitime.com ordering information s i t 1 5 6 6 a i - j e - 1 8 e - 3 2 . 7 6 8 s p a r t f a m i l y s i t 1 5 6 6 r e v i s i o n l e t t e r a : 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 d : 8 m m t a p e & r e e l , 3 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 o u t p u t c l o c k f r e q u e n c y ( k h z ) 3 2 . 7 6 8 k h z v : 3 p p m e : 5 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
SIT1566 1.2mm 2 power, low - jitter, 3 & 5 ppm, 32.768 khz super - tcxo rev 1.0 page 9 of 9 www.sitime.com table 4 . revision history version release date change summary 0.1 0 6/30/ 20 15 advanced datasheet initial release 0.7 0 3/ 11 / 20 16 prelim inary datasheet initial release 1.0 01/18/2018 production datasheet release , added 3ppm option updated logo and company address, other page layout changes sitime corporation , 5451 patrick henry drive , santa clara , ca 95054 , usa | phone: + 1 - 408 - 328 - 4400 | fax: +1 - 408 - 328 - 4439 ? sitime corporation 2015 - 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, the rmal, 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, including 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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