sit15 79 1.2mm 2 power, low - jitter, 1hz C 2.5 mhz oscillator rev. 1.1 october 12, 2017 www.sitime.com features ? 1 hz to 2.5 mhz 50 ppm all-inclusive frequency stability ? factory programmable output frequency ? worlds smallest oscillator 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 ? 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 application s ? health and wellness monitors ? smart pens ? ulp input devices ? proprietary wireless ? sensor interface electrical characteristics conditions: min/max limits are over temperature, v dd = 1.8v 10%, unless otherwise stated. typicals are at 25c and v dd = 1.8v. table 1. electrical characteristics parameter symbol min. typ. max. unit condition frequency and stability output frequency f out 1 2.5 m hz initial frequency tolerance f_tol - 10 10 ppm includes 2x reflow frequency stability f_stab - 50 50 ppm all inclusive of over temperature, referenced to nominal frequency at 25c, inclusive of v dd , aging, and load jitter performance integrated phase jitter ipj 2 3 .5 ns rms f out > 1 khz. integration bandwidth = 100 hz to f out /2. inclusive of 50 mv peak - to - peak sinusoidal noise on v dd . noise frequency 100 hz to 20 mhz rms 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. supply voltage and current consumption operating supply voltage v dd 1.62 3.63 v no load supply current i dd 3.6 5 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 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, to first output pulse . measured when supply reaches 90% of final v dd to the first output pul se and within specified min/max frequency limit. 500 + 3 cycles 1 hz f out 10 hz, to first output pulse. measured when supply reaches 90% of final v dd to the first output pul se and within specified 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. includes initial tolerance, over temp stability, 2x reflow, v dd range, board-level underfill, and 20% load variation. tested with agilent 53132a frequency counter. measured with 100 ms gate time for accurate frequency measurement.
SIT1579 1.2mm 2 power, low - jitter, 1hz 2.5 mhz oscillator rev. 1.1 page 2 of 8 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 ( v dd ) - 0.5 to 4.0 v continuous maximum operating temperature range 105 c short duration maximum operating temperature range ? 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 . SIT1579 block diagram 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 v dd power supply operates from nominal supply voltages between 1.8v and 3.3v. und er normal operating conditions, v dd does not require external bypass/decoupling capacitor(s). SIT1579 includes on - chip v dd filtering. 4 gnd power supply ground connect to ground. top view figure 1 . pin assignment control temp - to - digital nvm prog prog driver nc gnd g n d v d d c l k o u t n c 1 4 2 3
SIT1579 1.2mm 2 power, low - jitter, 1hz 2.5 mhz oscillator rev. 1.1 page 3 of 8 www.sitime.com description SIT1579 is an ultra - small and ultra - low power factory programmable oscillator with an output f requency range between 1 hz to 2.5 0 + ] 6 l 7 l p h ? v v l o l f r q 0 ( 0 6 w h f k q r o r j \ enables the first programmable, power oscillator l q w k h z r u o g ? v smallest footprint and chip - sca le packaging (cs p). ty pical supply current is only 6 a (100 khz) . sitime's mems oscillator consists of a mems resonator and a programmable analog circuit. SIT1579 mems resonator is built z l w k 6 l 7 l p h ? v x q l t x h 0 ( 0 6 ) l u v w ? s u r f h v v $ n h \ p d q x i d f w x u l q j v w h s l v ( s l 6 h d o ? g x u l q j z k l f k w k h 0 ( 0 6 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, 6 l 7 l p h ? v 0 ( 0 6 u h v r q ator die can be used like any other v h p l f r q g x f w r u g l h 2 q h x q l t x h u h v x o w r i 6 l 7 l p h ? v 0 ( 0 6 ) l u v w and episeal manufacturing processes is the capability to l q w h j u d w h 6 l 7 l p h ? v 0 ( 0 6 g l h z l w k d 6 2 & $ 6 , & p l f u r s u r f h v v r u or analog die within a package to eliminat e external timing components and provide a highly integrated, smaller, cheaper solution to the customer. frequency stability the SIT1579 oscillator is factory trimmed to 32.768 khz at room temperature. the result is a very accurate oscillator at room temp erature and over temperature. 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/c2 temperature coefficient (tcf), the SIT1579 temperature coefficient is calibrated at room temperature and corrected over temperature with an active temperature correction circuit. the result is <50 ppm frequency variation over the - 40c to +85c temperature range. when measuring the SIT1579 output frequency with a frequency counter, it is impo rtant to make sure the counter's gate time is >100 ms. shorter gate times may lead to inaccurate measurements.
SIT1579 1.2mm 2 power, low - jitter, 1hz 2.5 mhz oscillator rev. 1.1 page 4 of 8 www.sitime.com typical operating curves (t a = 25c, v dd = 1.8v, supply current plots are no load, unless otherwise stated) 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) figure 8 . supply current vs temperature ( f out = 100 khz) 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 figure 3 . lvcmos output swing (v dd = 1.8v) figure 4 . start - up and steady - state current profile 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 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
SIT1579 1.2mm 2 power, low - jitter, 1hz 2.5 mhz oscillator rev. 1.1 page 5 of 8 www.sitime.com figure 9 . supply current vs temperature ( f out = 500 khz) figure 10 . supply current vs temperature ( f out = 1 mhz) figure 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
SIT1579 1.2mm 2 power, low - jitter, 1hz 2.5 mhz oscillator rev. 1.1 page 6 of 8 www.sitime.com dimensions and patterns package size C # 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 )
SIT1579 1.2mm 2 power, low - jitter, 1hz 2.5 mhz oscillator rev. 1.1 page 7 of 8 www.sitime.com ordering information s i t 1 5 7 9 a i - j 3 - x x e - x x x x . x x x x x x q p a r t f a m i l y 3 6 l 7 1 5 7 9 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 3 & : 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 3 , : 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 3 6 : 8 m m t a p e & r e e l , 1 0 k u r e e l 3 - : 1 . 5 m m x 0 . 8 m m c s p 3 4 : 8 m m t a p e & r e e l , 5 k u r e e l 3 ( : 8 m m t a p e & r e e l , 1 k u r e e l 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 3 3 : 5 0 p p m s u p p l y v o l t a g e x x = 1 . 8 v 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 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 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 : 2 5 0 0 . 0 0 0 0 0 0 = 2 . 5 m h z 2 0 0 0 . 0 0 0 0 0 0 = 2 . 0 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
SIT1579 1.2mm 2 power, low - jitter, 1hz 2.5 mhz oscillator rev. 1.1 page 8 of 8 www.sitime.com table 4 . revision history version release date change summary 0.9 05/09/2017 initial preliminary datasheet release 0.95 06/12/2017 updated start - up time typical value 1 . 0 08 / 03 /2017 final release i ncreased maximum output frequency option added additional typical operating curves updated t ypical no load supply current ( table 1 ) 1.1 10/12/2017 updated the maximum frequency from 2.0 mhz to 2.5 mhz sitime corporation , 5451 patrick henry drive , santa clara , ca 95054 , usa | phone: + 1 - 408 - 328 - 4400 | fax: +1 - 408 - 328 - 4439 ? sitime corporation 2017. the information contained herein is subject to change at any time without notice. sitime assumes no responsibility or l iability 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 cir cuitry 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 alte red during assembly and are not capable of being tested by sitime under i ts 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, wi th regard to this material, and specifically 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 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 tradema rk. 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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