SIT1630 ultra - low power, ultra - small 32.768 khz or 16.384 khz oscillator features ? <20 ppm initial tolerance ? <100 ppm stability over - 40c to +85c ? small smd package: 2.0 x 1.2 mm (2012) [1] ? sot23 - 5 package option for industrial and automotive applications ? ultra - low power: 1.0 a typ ? vdd supply range: 1.5v to 3.63v ? wide o peratin g temperature range options ? internal filtering eliminates external vdd bypass capacitors ? pb - free, rohs and reach compliant applications ? industrial timekeeping ? industrial battery management ? multi - drop 32 khz clock distribution ? bluetooth modules ? wifi modules ? rtc reference clock note: 1. for the smallest 32 khz xo in csp (1.2mm 2 ), con sider the sit1532 . table 1. electrical characteristics parameter symbol min. typ. max. unit condition frequency and stability output frequency fout 32.768 or 16.384 khz frequency stability initial tolerance [2] f_init 20 ppm t a = 25c, post reflow, vdd: 1.5v C 3.63v. frequency stability over temperature [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. 150 t a = - 40c to +105c , - 55c to +85c , vdd: 1.8 v C 3.63v. 25c aging - 1 1 ppm 1st year supply voltage and current consumption operating supply voltage vdd 1.5 3.63 v t a = over temperature operating current idd 1.0 a t a = 25c, vdd: 1.5v C 3.3v. 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 2.80 t a = - 40c to +105c, vdd max: 3.63v. no load power - supply ramp t_vdd ramp 100 ms over temperature, 0 to 90% vdd start - up time at power - up t_start 180 300 ms - 40 c t a 50 c, valid output 450 - 40 c t a 85 c, valid output 500 + 1 period t a = - 55c and +105c operating temperature range commercial temperature t_opn - 10 70 c temp code c in part number ordering industrial temperature - 40 85 temp code i in part number ordering extended industrial temperature - 40 105 temp code e in part number ordering. extended cold industrial temperature - 55 85 temp code d in part number ordering. automotive temperature ran ge - 55 105 contact factory for availability lvcmos output, t a = over temperature, typical values are at t a = 25c output rise/fall time tr, tf 100 200 ns 10 - 90%, 15 pf load, vdd = 1.5v to 3.63v 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 maximum output drive 50 pf 80% lvcmos swing, t a = over temperature, vdd = 1.5v to 3.3v period jitter t_jitt 35 ns rms cycles = 10,000, t a = 25c 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. measured peak - to - peak. inclusive of initial tolerance at 25c, and variations over operating temperature, rated power supply voltage and load. rev 1. 3 october 12, 2017 www.sitime.com
rev. 1.3 page 2 of 9 www.sitime.com SIT1630 ultra - low power, ultra - small 32.768 khz and 16.384 khz oscillator table 2 . pin configuration smd pin sot23 - 5 pin symbol i/o functionality 1 2, 3 nc/gnd no connect connect to gnd or leave floating. 2 1 gnd power supply ground connect to ground. all gnd pins must be connected to power supply ground. 3 5 clk out out oscillator clock output. when interfacing to an mcus xtal input, the clk out is typically connected to the receiving ics x in pin. 4 4 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). internal power supply filtering will reject more than 150 mvpp with frequency components through 10 mhz. sot23 - 5 (top view) smd package (top view) figure 1 . pin assignments figure 2 . pin assignments system block diagram figure 3 . SIT1630 block diagram table 3 . absolute maximum 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, over - 40c to +85c 4.0 v short duration maximum operating temperature range vdd = 1.5v - 3.63v, 30 mins 125 c maximum continuous operating life at temperature extreme (meeting datasheet limits) t a = - 55 c, continuous vdd = 1.8v C 3.3v 10% 8 hours human body model 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 2012 smd junction temperature 150 c sot23 - 5 junction temperature 150 c storage temperature - 65c to 150c nc/gnd nc/gnd gnd clk out vdd ? yxxx 1 2 3 4 5 1 4 3 2 nc vdd clk out gnd sustaining prog ultra - low power pll nc/gnd gnd
rev. 1.3 page 3 of 9 www.sitime.com SIT1630 ultra - low power, ultra - small 32.768 khz and 16.384 khz oscillator description the SIT1630 is an ultra - small and ultra - low power 32.768 khz oscillator optimized for battery - powered applications. sitimes mems oscillators consist of mems resonators and a programmable analog circuit. our mems resonators are built with sitimes unique mems first? process. a key manufac turing step is episeal? during which the mems resonator is annealed with temperatures over 1000c. episeal creates an extremely strong, clean, vacuum cham ber 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 resul t, 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. frequency stability the SIT1630 is factory calibrated (trimmed) to guarantee frequency stability to be less than 20 ppm at room temperature and very tight stability over temperature. unlike quartz crystals that have a classic tuning fork parabola temperature curve with a 25c turnover point, the SIT1630 temperature coefficient is extremely flat across temperature. when measuring th e SIT1630 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 32 khz clock will give false readings with faster gate times. figure 4 . sitime vs. quartz power supply noise immunity the SIT1630 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 simpl ifies the design and keeps the footprint as small as possible. internal power supply filtering is designed to reject ac - noise greater than 150 mvpp magnitude and beyond 10 mhz frequency component. power - up the SIT1630 starts - up to a valid output frequency within 300 ms (180 ms typ). to ensure the device starts - up within the specified limit, make sure the power - supply ramps - up in approximately 10 C 20 ms (to within 90% of vdd). SIT1630 industrial temp specification SIT1630 20 ppm max @ 25c quartz xtal - 160 to - 220 ppm over temp temperature (c) fre q uency stability (p p m)
rev. 1.3 page 4 of 9 www.sitime.com SIT1630 ultra - low power, ultra - small 32.768 khz and 16.384 khz oscillator temperature (c) typical operating curves (t a = 25c, vdd = 1.8v, unless otherwise stated) initial tolerance (ppm) t a = 25 c post reflow figure 5 . initial tolerance histogram figure 6 . frequency stability over temperature figure 7 . supply current over temperature (no load) figure 8 . start - up time n u mb e r of devices f r equency s t abi l ity ( ppm) temperature ( c) no load cu rr e n t (a) vo l t a g e ( v ) time (sec)
rev. 1.3 page 5 of 9 www.sitime.com SIT1630 ultra - low power, ultra - small 32.768 khz and 16.384 khz oscillator figure 9 . power supply noise rejection (150mv noise) figure 10 . lvcmos output waveform (vswing = 1.8v, SIT1630ai - h4 - dcc - 32.768)
rev. 1.3 page 6 of 9 www.sitime.com SIT1630 ultra - low power, ultra - small 32.768 khz and 16.384 khz oscillator table 4. dimensions and patterns package size C dimensions (unit: mm ) recommended land pattern (unit: mm ) 2.0 x 1.2 mm smd 2.90 x 2.80 mm sot23 - 5 table 5. sot23 - 5 dimension table symbol min. nom. max. a 0.90 1.27 1.45 a1 0.00 0.07 0.15 a2 0.90 1.20 1.30 b 0.30 0.35 0.50 c 0.14 0.15 0.20 d 2.75 2.90 3.05 e 2.60 2.80 3.00 e1 1.45 1.60 1.75 l 0.30 0.38 0.55 l1 0.25 ref e 0.95 bsc. e1 1.90 bsc. ? ? 0 C 8 # 1 # 2 # 3 # 4 # 3 # 1 # 4 # 2 0 . 3 2 4 0 . 0 5 0 0 . 4 0 0 . 2 0 0 . 0 5 0 1 . 0 4 8 0 . 0 5 0 0 . 3 0 1 . 2 0 0 . 0 5 2 . 0 0 . 0 5 0 . 5 5 0 . 0 5 1 . 3 0 0 . 6 5
rev. 1.3 page 7 of 9 www.sitime.com SIT1630 ultra - low power, ultra - small 32.768 khz and 16.384 khz oscillator manufacturing guidelines 1) no ultrasonic cleaning . do not subject the SIT1630 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 - vo ltage 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 oscillator. ? 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. 3) f or additional manufacturing guidelines and marking/tape - reel instructions, click on the following link: http://www.sitime.com/component/docman/doc_download/243 - manufacturing - notes - for - sitime - oscillators
rev. 1.3 page 8 of 9 www.sitime.com SIT1630 ultra - low power, ultra - small 32.768 khz and 16.384 khz oscillator ordering information part number characters in blue represent the customer specific optio ns. the other characters in the part number are fixed. s it16 3 0 a i - h4 - dcc - s part family SIT1630 revision letter a: temperature range c: i: industrial, e: d: package size h: 2.0 mm x 1.2 mm s: sot23 frequency stability 5: 4: 6:
rev. 1.3 page 9 of 9 www.sitime.com SIT1630 ultra - low power, ultra - small 32.768 khz and 16.384 khz oscillator table 6 . revision history version release date change summary 1.0 0 9/03 / 20 14 rev 0.85 preliminary to rev 1.0 production release ? updated start - up time specification ? deleted sot23 package option ? added typical operating plots ? added maximum output drive specification ? added manufacturing guidelines section 1.1 09 / 03 / 20 14 ? updated start - up time plot in typical operating curves section ? updated start - up time specification 1.2 11/10/ 20 14 ? added additional design - in/mfg guidelines 1.3 03/0 6 /2017 ? added sot23 - 5 package option ? improved max supply current for commercial and industrial temp ranges ? improved max start - up time at 85 c ? updated start - up time temperature range conditions sitime corporation , 5451 patrick henry drive , santa clara , ca 95054 , usa | phone: + 1 - 408 - 328 - 4400 | fax: +1 - 408 - 328 - 4439 ? sitime corporation 2016 - 2017. 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 pro duct, (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) 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 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 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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