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SIT1552 smallest (1.2mm 2 ), smallest (1.2mm2), ultra - low power, 32.768 khz mems tcxo smallest (1.2mm 2 ), ultra - low power, 32.768 khz mems tcxo features ? 32.768 khz 5, 10, 20 ppm frequency stability options over temp ? worlds smallest tcxo in a 1.5 x 0.8 mm csp ? operating temperature ranges: ? 0c to +70c ? - 40c to +85c ? ultra - low power: <1 a ? vdd supply range: 1.5v to 3.63v ? improved stability reduces system power with fewer network timekeeping updates ? internal filtering eliminates external vdd bypass cap and saves space ? pb - free, rohs and reach compliant applications ? smart meters (amr) ? health and wellness monitors ? pulse - per - second (pps) timekeeping ? rtc reference clock electrical specifications table 1 . electrical characteristics parameter symbol min. typ. max. unit condition frequency and stability output frequency fout 32.768 khz frequency stability over temperature [1 ] (without initial offset [2] ) f_stab - 5.0 5.0 ppm stability part number code = e - 10 10 stability part number code = f - 20 20 stability part number code = 1 frequency stability over temperature (with initial offset [2] ) f_stab - 10 10 ppm stability part number code = e - 13 13 stability part number code = f - 22 22 stability part number code = 1 frequency stability vs voltage f_vdd - 0.75 0.75 ppm 1.8v 10% - 1.5 1.5 ppm 1.5v C 3.63v first year frequency aging f_aging - 1.0 1.0 ppm t a = 25c, vdd = 3.3v jitter performance (t a = over temp) long term jitter 2.5 s pp 81920 cycles (2.5 sec), 100 samples period jitter 35 ns rms cycles = 10,000, t a = 25c, vdd = 1.5v C 3.63v supply voltage and current consumption operating supply voltage vdd 1.5 3.63 v t a = - 40c to +85c core supply current [3] idd 0.99 a t a = 25c, vdd = 1.8v, lvcmos output configuration, no load 1.52 t a = - 40c to +85c, vdd = 1.5v C 3.63v, no load power - supply ramp t_vdd_ ramp 100 ms vdd ramp - up 0 to 90% vdd, t a = - 40c to +85c start - up time at power - up t_start 180 300 ms t a = - 40c +60c, valid output 350 t a = +60c to +70c, valid output 380 t a = +70c to +85c, valid output notes: 1. no board level underfill . measured as peak - to - peak/2. inclusive of 3x - reflow and 20% load variation. 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. 2. initial offset is def ined as the frequency deviation from the ideal 32.768 khz at room temperature, post reflow. 3. core operating current does not include output driver operating current or load current. to derive total operating current (n o load), add core operating current + o utput driver operating current, which is a function of the output voltage swing. see the description titled calculating load current . rev 1.31 january 18, 2018 www.sitime.com
SIT1552 smallest (1.2mm 2 ), ultra - low power, 32.768 khz mems tcxo rev 1.31 page 2 of 11 www.sitime.com table 1 . electrical characteristics (continued) parameter symbol min. typ. max. unit condition operating temperature range commercial temperature op_temp 0 70 c industrial temperature - 40 85 c lvcmos output output rise/fall time tr, tf 100 200 ns 10 - 90% (vdd), 15 pf load 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 = - 1 a, 15 pf load output voltage low vol 10% v vdd: 1.5v C 3.63v. i ol = 1 a, 15 pf load table 2 . pin configuration csp pin symbol i/o functionality 1, 4 gnd power supply ground connect to ground. all gnd pins must be connected to power supply ground. the gnd pins can be connected together, as long as both gnd pins are connected ground. 2 clk out out oscillator clock output. when interfacing to an mcus xtal, the clk out is typically connected to the receiving ics x in pin. the SIT1552 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. 3 vdd power supply connect to power supply 1.5v vdd 3.63v. under normal operating conditions, vdd does not require external bypass/decoupling capacitor(s). for more information about the internal power - supply filtering, see power - supply noise immunity section in the detailed description. contact sitime for applications that require a wider operating supply voltage range. csp package (top view) figure 1 . pin assignments g n d v d d c l k o u t g n d 1 4 2 3
SIT1552 smallest (1.2mm 2 ), ultra - low power, 32.768 khz mems tcxo rev 1.31 page 3 of 11 www.sitime.com system block diagram figure 2 . si t1552 block diagram table 3 . absolute maximum limits attempted operation outside the absolute maximum ratings cause permanent damage to the part. actual performance of the ic is only guaranteed within the operational specifications, not at absolute maximum 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 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 (hbm) esd protection jesd22 - a114 3000 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 10,000 g mechanical vibration resistance mil 883, method 2007 70 g 1508 csp junction temperature 150 c storage temperature - 65c to 150c 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 g n d c l k o u t 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
SIT1552 smallest (1.2mm 2 ), ultra - low power, 32.768 khz mems tcxo rev 1.31 page 4 of 11 www.sitime.com description the si t1552 is an ultra - small and ultra - low 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 core supply current is only 1 a. 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 a nd provide a highly integrated, smaller, cheaper solution to the customer. tcxo frequency stability the SIT1552 is factory calibrated (trimmed) over multiple temperature points to guarantee extremely tight stability over temperature. unlike quartz crystal s that have a classic tuning fork parabola temperature curve with a 25c turnover point with a 0.04 ppm/c2 temperature coefficient, the SIT1552 temperature coefficient is calibrated and corrected over temperature with an active temperature correction circu it. the result is 32 khz tcxo with extremely tight frequency variation over the - 40c to +85c temperature range. contact sitime for applications that require a wider supply voltage range > 3.63v, or lower operating frequency below 32 khz. when measuring the SIT1552 output frequency with a frequency counter, it is important to make sure the counter's gate time is >100 ms. the slow frequency of a 32khz clock will give false readings with faste r gate times. power supply noise immunity 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 capacit or to keep the footprint as small as possible. internal power supply filtering is designed to reject more than 150 mv noise and frequency components from low frequency to more than 10 mhz. start - up and steady - state supply current the SIT1552 tcxo starts - u p to a valid output frequency within 300 ms (180 mstyp). to ensure the device starts - up within the specified limit, make sure the power - sup ply ramps - up in approximately 10 C 20 ms (to within 90% of vdd). during initial power - up, the SIT1552 power - cycles in ternal blocks, as shown in the power - supply start - up and steady state plot in the typical operating curves section. power - up and initialization is typically 200 ms, and during that time, the peak supply current reaches 28 a as the internal capacitors are charged, then sequentially drops to its 990 na steady - state current. during steady - state operation, the internal temperature compensation circuit turns on every 350 ms for a duration of approximately 10 ms.
SIT1552 smallest (1.2mm 2 ), ultra - low power, 32.768 khz mems tcxo rev 1.31 page 5 of 11 www.sitime.com calculating load current no load supply current when calculating no - load power for the SIT1552 , the core and output driver components need to be added. since the output voltage swing can be programmed to minimize load current, the output driver current is variable. therefore, no - load operating supply current is broken into two sections; core and output driver. the equation is as follows: total supply cu rr ent (no load) = idd core + idd o utp ut driver example 1: full - swing lvcmos ? vdd = 1.8v ? idd core = 990na (typ) ? voutpp = 1.8v ? idd outpu t driver: (cdriver)(vout)(fout) = (3.5pf)(1.8v)(32768hz) = 206na ? supply current = 990na + 206na = 1.2a total supply current with load to calculate the total supply current, including the load, follow the equation listed below. total current = idd core + idd output driver + load current example 1 : full - swing lvcmos ? vdd = 1.8v ? idd core = 990n ? load capacitance = 10pf ? idd output driver: (cdriver)(vout)(fout) = (3.5pf)(1.8v)(32768hz) = 206na ? load current: (10pf)(1.8v)(32768hz) = 590na ? total current = 990na + 206na + 590na = 1.79a
SIT1552 smallest (1.2mm 2 ), ultra - low power, 32.768 khz mems tcxo rev 1.31 page 6 of 11 www.sitime.com typical operating curves (t a = 25c, vdd = 1.8v, unless otherwise stated) figure 3 . frequency stability over temperature (pre - reflow) figure 4 . frequency stability over temperature (post - reflow) figure 5 . core current over temperature figure 6 . output stage current over temperature figure 7 . total supply current over temperature, lvcmos (core + lvcmos output driver, no load) figure 8 . start - up and steady - state current profile p r e - r e f l o w 5 p p m o p t i o n ( e ) 2 0 0 u n i t s p o s t 3 x - r e f l o w 5 p p m o p t i o n ( e ) 2 0 0 u n i t s f r e q u e n c y s t a b i l i t y ( p p m ) t e m p e r a t u r e ( c ) v d d = 3 . 6 3 v v d d = 1 . 5 C 1 . 8 v o u t p u t s t a g e c u r r e n t ( n a / v p p ) t e m p e r a t u r e ( c ) v d d = 3 . 6 3 v v d d = 1 . 5 C 1 . 8 v n o l o a d c u r r e n t ( a ) t e m p e r a t u r e ( c ) v d d = 3 . 6 3 v v d d = 1 . 5 C 1 . 8 v 0 . 9 9 ( 6 a ) t i m e f r o m p o w e r o n [ m s ]
SIT1552 smallest (1.2mm 2 ), ultra - low power, 32.768 khz mems tcxo rev 1.31 page 7 of 11 www.sitime.com figure 9 . power supply noise rejection (150mv noise) figure 10 . temperature ramp response figure 11 . lvcmos output waveform (vswing = 1.8v, SIT1552ai - je - dcc - 32.768, 10 pf load) 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 )
SIT1552 smallest (1.2mm 2 ), ultra - low power, 32.768 khz mems tcxo rev 1.31 page 8 of 11 www.sitime.com dimensions and patterns pa ckage size C dimensions (unit: mm) reco mmended landing pattern (unit: mm) 1.55 x 0.85 mm csp recommend 4 - mil (0.1mm) stencil thickness # 1 # 2 # 4 # 3 # 2 # 1 # 3 # 4 1 . 5 4 0 . 0 2 0 . 8 4 0 . 0 2 0 . 3 1 5 0 . 0 1 5 # 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 )
SIT1552 smallest (1.2mm 2 ), ultra - low power, 32.768 khz mems tcxo rev 1.31 page 9 of 11 www.sitime.com manufacturing guidelines 1) no ultrasonic cleaning: do not subject the SIT1552 to an ultrasonic cleaning environment. permanent damage or long term reliability issues to the mems structure may occur. 2) do not apply underfill to the SIT1552. the device will not meet the frequency stability specificat ion if underfill is applied. 3) reflow profile, per jesd22 - a113d. 4) for additional manufacturing guidelines and marking/tape - reel instructions, refer to: sitime manufacturing notes .
SIT1552 smallest (1.2mm 2 ), ultra - low power, 32.768 khz mems tcxo rev 1.31 page 10 of 11 www.sitime.com ordering information part number characters in blue represent the customer specific options. the other characters in the part number are fixed. s i t 1 5 5 2 a i - j e - d c c - 3 2 . 7 6 8 s p a r t f a m i l y s i t 1 5 5 2 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 i : i 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 b l a n k f o r b u l k s a m p l e s i n c u t t a p e & r e e l s t r i p s c : c o m m e r c i a l , 0 t o 7 0 o c 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 j : 1 . 5 m m x 0 . 8 m m c s p 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 o v e r t e m p e r a t u r e s t a b i l i t y o p t i o n s e : 5 p p m o u t p u t c l o c k f r e q u e n c y ( k h z ) 1 : 2 0 p p m f : 1 0 p p m 3 2 . 7 6 8 k h z l v c m o s o u t p u t
SIT1552 smallest (1.2mm 2 ), ultra - low power, 32.768 khz mems tcxo rev 1.31 page 11 of 11 www.sitime.com table 4 . revision history version release date change summary 1.0 0 9/17/ 20 14 rev 0.9 preliminary to rev 1.0 production release updated start - up time specification added typical operating plots removed sot23 and 2012 smd package options added no underfill in frequency stability specification condition added manufacturing guidelines section 1.1 10/14/ 20 14 improved start - up time at power - up spec added 5 pf lvcmos rise/fall time spec 1.2 11/10/ 20 14 updated 5 pf lvcmos rise/fall time spec 1.3 11/12/ 20 15 removed nanodrive from ec table and ordering info updated logo and company address 1.31 01/18/2018 updated spl , 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 201 4 - 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) unauthor ized 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) 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 op eration 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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