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SIT1534 ultra - small, ultra - low power 1 hz C 32.768 khz programmable oscillator electrical specifications table 1 . electrical characteristics parameter symbol min. typ. max. unit condition frequency and stability programmable output frequency 1.00 32768.0 hz factory programmed between 1 and 32.768 khz in powers of 2 frequency stability frequency tolerance [ 1 ] f_tol 20 ppm t a = 25c, post reflow, includes underfill, vdd: 1.5v C 3.63v frequency stability [ 2 ] 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. 250 t a = - 10c to +70c, vdd: 1.2v C 1.5v. 25c aging - 1 1 ppm 1st year supply voltage and current consumption operating supply voltage vdd 1.2 3.63 v t a = - 10c to +70c 1.5 3.63 v t a = - 40c to +85c core operating current [ 3 ] idd 0.9 a t a = 25c, vdd: 1.8v. 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 output stage operating current [ 3 ] idd_out 0.065 0.125 a/vpp t a = - 40c to +85c, vdd: 1.5v C 3.63v. no load power - supply ramp t_vdd_ ramp 100 ms t a = - 40c to +85c, 0 to 100% vdd start - up time [ 4 ] t_start 300 + 1 period ms t a = 25c 10c, valid output 500 + 1 period t a = - 40c to +85c, valid output operating temperature range commercial temperature t_use - 10 70 c industrial temperature - 40 85 c lvcmos output option, t a = - 40c to +85c, typical value is t a = 25c output rise/fall time tr, tf 100 200 ns 10 - 90% (vdd), 15 pf load, vdd = 1.5v to 3.63v output clock duty cycle dc 48 52 % output voltage high voh 90% v vdd: 1.5v C 3.63v. i oh = - 10a, 15 pf output voltage low vol 10% v vdd: 1.5v C 3.63v. i ol = 10a, 15 pf notes: 1. 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. 2. measured peak - to - peak. inclusive of initial tolerance at 25c, and variations over operating temperature, rated power supply voltage and load. stability is specified for two operating voltage ranges. stability progressively degrades with supply voltage below 1.5v. 3. core operating current does not include output driver operating current or load current. to derive total operating current (no load), add core operating current + (0.065 a/v) * (output voltage swing). 4. measured from the time vdd reaches 1.5v. features ? factory programmable from 32.768 khz down to 1 hz ? <20 ppm frequency tolerance ? smallest footprint in chip - scale (csp): 1.5 x 0.8 mm ? pin - compatible to 2.0 x 1.2 mm xtal smd package ? ultra - low power: <1a ? vdd supply range: 1.5v to 3.63v over - 40c to +85c ? supports low - voltage battery backup from a coin cell or supercap ? oscillator output eliminates external load caps ? internal filtering eliminates external vdd bypass cap ? nanodrive? programmable output swing for lowest power ? pb - free, rohs and reach compliant applications ? mobile phones ? tablets ? health and wellness monitors ? fitness watches ? sport video cams ? wireless keypads ? ultra - small notebook pc ? pulse - per - second (pps) timekeeping ? rtc reference clock ? battery management timekeeping rev 1.31 january 18, 2018 www.sitime.com
sit 1534 ultra - small, ultra - low power 1 hz C 32.768 khz programmable oscillator rev 1.31 page 2 of 12 www.sitime.com table 1 . electrical characteristics (continued) parameter symbol min. typ. max. unit condition nanodrive? programmable, reduced swing output output rise/fall time tf, tf 200 ns 30 - 70% (v ol /v oh ), 10 pf load output clock duty cycle dc 48 52 % ac - coupled programmable output swing v_sw 0.20 to 0.80 v SIT1534 does not internally ac - couple. this output description is intended for a receiver that is ac - coupled. see table 6 for acceptable nanodrive swing options. vdd: 1.5v C 3.63v, 10 pf load, i oh / i ol = 0.2 a. dc - biased programmable output voltage high range voh 0.60 to 1.225 v vdd: 1.5v C 3.63v. i oh = - 0.2 a, 10 pf load . see table 5 for acceptable v oh /v ol setting levels. dc - biased programmable output voltage low range vol 0.35 to 0.80 v vdd: 1.5v C 3.63v. i ol = 0.2 a, 10 pf load. see table 5 for acceptable v oh /v ol setting levels. programmable output voltage swing tolerance - 0.055 0.055 v t a = - 40c to +85c, vdd = 1.5v to 3.63v. jitter performance period jitter t_djitt 35 ns rms cycles = 10,000, t a = 25c, vdd = 1.5v C 3.63v table 2 . pin configuration (smd) smd package (top view) figure 1 . pin assignments (smd) table 3 . pin configuration (csp) csp package (top view) figure 2 . pin assignments (csp) pin symbol i/o functionality 1 nc no connect, dont care no connect. will not respond to any input signal. when the SIT1534 is used as an alternative to an xtal, this pin is typically connected to the receiving ics x out pin. in this case, the SIT1534 will not be affected by the signal on this pin. 2 gnd power supply ground connect to ground. 3 clk out out oscillator clock output. when the SIT1534 is used as an alternative to an xtal, the clk out is typically connected to the receiving ics x in pin. no need for load capacitors. the output driver is independent of capacitive loading. 4 vdd power supply connect to power supply 1.2v 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 the power supply noise imm unity section in the detailed description. contact sitime for applications that require a wider operating supply voltage range. pin symbol i/o functionality 1, 4 gnd power supply ground connect to ground. acceptable to connect pin 1 and 4 together. both pins must be connected to gnd. 2 clk out out oscillator clock output. the clk can drive into a ref clk input or into an asic or chip - sets 32khz xtal input. when driving into an asic or chip - set oscillator input (x in and x out), the clk out is typically connected directly to the xtal in pin. no need for load capacitors. the output driver is intended to be insensitive to capacitive loading. 3 vdd power supply connect to power supply 1.2v 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 the power supply noise immunity section in the detailed description. contact sitime for applications that require a wider operating supply voltage range. 4 1 3 2 vdd clk out nc gnd g n d v d d c l k o u t g n d 1 4 2 3
sit 1534 ultra - small, ultra - low power 1 hz C 32.768 khz programmable oscillator rev 1.31 page 3 of 1 2 www.sitime.com system block diagram figure 3 . sit153 4 block diagram table 4 . 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 speci fications, 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 2012 smd junction temperature 150 c 1508 csp junction temperature 150 c storage temperature - 65c to 150c u l t r a - l o w p o w e r 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 v d d g n d c l k o u t p r o g d i v i d e r n c o 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 f r e q u e n c y a d j u s t u l t r a - l o w p o w e r d r i v e r
sit 1534 ultra - small, ultra - low power 1 hz C 32.768 khz programmable oscillator rev 1.31 page 4 of 12 www.sitime.com description the SIT1534 is the first programmable oscillator capable of a frequency range between 32.768 khz down to 1 hz for true pulse - per - second (pps) operation. sitimes silicon mems technology enables the smallest footprint and chip - scale packaging. in the chip - s cale package (csp), these devices reduce footprint by as much as 80% compared to existing 2. 0 x 1.2 mm smd xtal packages. unlike xtals, the SIT1534 oscillator output enables greater component placement flexibility and eliminates external load capacitors, t hus saving additional component count and board space. and unlike standard oscillators, the SIT1534 features nanodrive?, a factory programmable output that reduces the voltage swing to minimize power. 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 pac kaging. 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 and provide a highly integrated, smaller, cheaper solution to the customer. for applications that require xtal resonator compatibility, the SIT1534 is available in the 2.0 x 1.2 mm (2012) package. unlike xtal resonators, sitimes silicon mems oscillators require a power supply (vdd) and ground (gnd) pin. vdd and gnd pins are conve niently placed between the two large xtal pins. when using the sitime solder pad layout (spl), the SIT1534 footprint is compatible with existing 32 khz xtals in the 2012 smd package. figure 4 shows the comparison between the quartz xtal footprint and the sitime footprint. 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 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 and provide a highly integrated, smaller, cheaper solution to the customer. frequency stability the SIT1534 is factory calibrated (trimmed) to guarantee frequency stability to be less than 20 ppm at room temperature and less than 100 ppm over the full - 40c to +85c temperature range. unlike quartz crystals that have a classic tuning fork parabola temperature curve with a 25c turnover point, th e SIT1534 temperature coefficient is extremely flat across temperature. this device maintains less than 100 ppm frequency stability over the full operating temperature range when the operating voltage is between 1.5 and 3.63v as shown in figure 5 . functionality is guaranteed over the full supply voltage range. however, frequency stability degrades below 1.5v and steadily degrades as it approaches 1.2v due to the intern al regulator limitations. when measuring the SIT1534 output frequency with a frequency counter, it is important to make sure the counter's gate time is > 100ms. the slow frequency of a 32 khz clock will give false readings with faster gate times. for applications that require a higher operating voltage range, consider the sit1544 with a 2.7v to 4.5v supply voltage range. quartz sitime top view top view figure 4 . SIT1534 footprint compatibility with quartz xtal footprint [ 5 ] figure 5 . sitime vs. quartz note: 5. on the sitime device, x in is not internally connected and will not respond to any signal. it is acceptable to connect to chipset x out. x out x in connect to x out or nc clock out connect to x in gnd sit153x industrial temp specification SIT1534 20 ppm max @ 25c quartz xtal - 160 to - 220 ppm over temp temperature (c) fre q uency stability (p p m)
sit 1534 ultra - small, ultra - low power 1 hz C 32.768 khz programmable oscillator rev 1.31 page 5 of 12 www.sitime.com power supply noise immunity in addition to eliminating external output load capacitors common with standard xtals, this device includes special power supply f iltering and thus, eliminates the need for an external vdd bypass - decoupling capacitor. this feature further simplifies the design and keeps the footprint as small as possible. internal power supply filtering is designed to reject ac - noise greater than 15 0 mvpp and beyond 10 mhz frequency components . programmable frequency the SIT1534 is the first oscillator to feature a programmable frequency range between 1 hz and 32.768 khz in powers of two. reducing the frequency significantly reduces the output load c urrent (c*v*f). for example, reducing the frequency from 32.768 khz to 10 khz improves load current by 70%. similarly, reducing the output frequency from 32.768 khz down to 1hz reduces the load current by more than 99%. the part number ordering shows the specific frequency options. nanodrive? reduced swing output voltage for low - power applications that drive directly into a chip - sets xtal input, the reduced swing output is ideal. sitimes unique nanodrive?, factory - programmable output stage is optimized for low voltage swing to minimize power and maintain compatibility with the downstream oscillator input (x in pin). the SIT1534 output swing is factory programmed between 250 mv and 800 mv. for dc - coupled applications, output v oh and v ol are individually f actory programm ed. contact sitime for programming support. power - up the SIT1534 starts - up to a valid output frequency within 300 ms when operating at 32.768 khz. for frequencies less than 32.768 khz , the start - up time can increase by an additional clock period. the maximum start - up time over temperature is 500 ms max over temperature plus a clock period. for example, the maximum start - up time for a 256 h z clock is 500 ms + 3.9 ms. to ensure the devic e starts - up within the specified limit, make sure the power - supply ramps - up in approximately 10 C 20 ms (to within 90% of vdd). start - up time is measured from the time vdd reaches 1.5v. for applications that require start - up between 1.2v and 1.5v, the start - up time will be typically 50 ms longer. SIT1534 nanodrive? figure 6 shows a typical output waveform of the SIT1534 (into a 10 pf load) when factory programmed for a 0.70v swing and dc bias (v oh /v ol ) for 1.8v logic: example: ? nanodrive? part number coding: d14. example part number: SIT1534ai - j4 - d14 - 32.768 ? v oh = 1.1v, v ol = 0.4v (v sw = 0.70v) figure 6 . SIT1534ai - j4 - d14 - 32.768 output waveform (10 pf load) table 5 shows the supported nanodrive? v oh , v ol factory programming options. table 5 . acceptable v oh /v ol nanodrive ? levels nanodrive v oh (v) v o l (v) swing (mv) comments d26 1.2 0.6 600 5 5 1.8v logic compatible d14 1.1 0.4 700 5 5 1.8v logic compatible d74 0.7 0.4 300 5 5 xtal compatible aa3 n/a n/a 300 5 5 xtal compatible SIT1534 full swing lvcmos output the SIT1534 can be fact ory programmed to generate full - swing lvcmos levels. figure 5 shows the typical waveform (vdd = 1.8v) at room temperature into a 15 pf load. figure 7 . lvcmos waveform (vdd = 1.8v) into 15 pf load example: ? lvcmos output part number coding is always dcc example part number: SIT1534ai - j4 - dcc - 32.768
sit 1534 ultra - small, ultra - low power 1 hz C 32.768 khz programmable oscillator rev 1.31 page 6 of 12 www.sitime.com calculating load current no load supply current when calculating no - load power for the SIT1534, the core and output driver components need to be added. since the output voltage swing can be programmed for reduced swing between 250 mv and 800 mv for ultra - low power applications, the output driver current is variable and is a function of the output voltage swing and the output frequency. therefore, no - load operating supply current is broken into two sections; core and output driver. the real benefit of nanodrive? is shown in the total supply current with l oad calculatio n in the next section. the equation is as follows: total supply current (no load) = idd core + idd output driver example 1: full - swing lvcmos ? vdd = 1.8v ? fout = 32.768khz ? vout = vdd ? idd output driver: (3.5pf)(vout)(fout) = 206na ? idd core = 900na (typ) ? vout = vdd = 1.8v supply current = 900na + 206na = 1.1a example 2: nanodrive? reduced swing ? vdd = 1.8v ? fout = 32.768khz ? vout (programmable) = voh C vol = 1.1v - 0.6v = 500mv ? idd core = 900na (typ) ? idd output driver: (3.5pf)(vout)(fout) = 57na supply current = 900na + 57na = 957na calculating total supply current with load to calculate the total supply current, including the load, follow the equation listed below. note the 35% reduction in power with nanodrive? as shown in example 2. reducing the out - put clock frequency reduces the load current significantly, as shown in example 3. total current = idd core + idd output driver + load current example 1: full - swing lvcmos ? vdd = 1.8v ? fout = 32.768khz ? vout = vdd ? idd core = 900na ? idd output driver: (3.5pf)(vout)(fout) = 206na ? load current: (10pf)(1.8v)(32.768khz) = 590na total current with load = 900na + 205na + 590na =1.5 a example 2: nanodrive? reduced swing ? vdd = 1.8v ? fout = 32.768khz ? idd core = 900na ? vout (programmable): voh C vol = 1. 2 v - 0.6v = 6 00mv ? idd output driver: (3.5pf)(vout)(fout) = 69 na ? load current: ( 5 pf)(0. 6 v)(32.768khz) = 98 na total current with load = 9 00na + 69 na + 98 na = 1. 07 a example 3: lvcmos and 1 hz output frequency ? same conditions as above example 1, but with output frequen cy = 1 hz. this will significantly reduce the current consumption from the output stage and the load. ? idd core = 900na ? idd output stage = (3.5pf)(1.8v)(1hz) = 6.3pa ? 1hz output frequency impacts the load current as shown below: load current = cvf = (10pf)( 1.8v)(1hz) = 18pa total supply current with load = core current + output stage current + load current = 900na + 0.0063na + 0.018na = 900na summary: reducing the output frequency to 1 hz virtually eliminates the current consumption from the output stage and load current.
sit 1534 ultra - small, ultra - low power 1 hz C 32.768 khz programmable oscillator rev 1.31 page 7 of 12 www.sitime.com typical operating curves (t a = 25c, vdd = 1.8v, unless otherwise stated) frequency stability o ver temperature figure 8 . initial tolerance histogram figure 9 . frequency stability over temperature figure 10 . core current over temperature figure 11 . output stage current over temperature figure 12 . 32.768 khz start - up time temperature (c) temperature (c) time (sec) vo l t a g e ( v ) initial tolerance (ppm) ta = 25c post reflow, no underfill
sit 1534 ultra - small, ultra - low power 1 hz C 32.768 khz programmable oscillator rev 1.31 page 8 of 12 www.sitime.com figure 13 . power supply noise rejection (150mv noise) figure 14 . nanodrive? output waveform (v oh = 1.1v, v ol = 0.4v; SIT1534ai - j4 - d14 - 32.768) figure 15 . lvcmos output waveform (v swing = 1.8v, SIT1534ai - j4 - dcc - 32.768) noise injection frequency (hz)
sit 1534 ultra - small, ultra - low power 1 hz C 32.768 khz programmable oscillator rev 1.31 page 9 of 12 www.sitime.com di mensions and patterns package size C dimensions (unit: mm) [ 6 ] recommended land pattern (unit: mm) 2.0 x 1.2 mm smd sitime only spl sitime alternate spl with larger center pads xtal compatible spl 1.55 x 0.85 mm csp recommended 4 - mil (0.1mm) stencil thickness note: 6. for marking guidance, see sitimes manufacturing notes, located on the sitime web site in th e quality & reliability section. # 1 # 2 # 3 # 4 # 3 # 1 # 4 # 2 0 . 3 ( 2 x ) 0 . 4 ( 2 x ) 0 . 5 5 0 . 4 0 . 6 5 1 . 4 ( 2 x ) 1 . 2 2 . 0 0 . 5 ( 2 x ) 0 . 5 ( 2 x ) # 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 )
sit 1534 ultra - small, ultra - low power 1 hz C 32.768 khz programmable oscillator rev 1.31 page 10 of 12 www.sitime.com manufacturing guidelines 1) no ultrasonic cleanin g: do not subject the SIT1534 to an ultrasonic cleaning environment. permanent damage or long term reliability issues to the mems structure may occur. 2) applying board - level underfill (bluf) to the device is acceptable. it is reasonable to expect a slight shift in the frequency and has been accounted for in the frequency tolerance specification. tested with uf3810, uf3808, and fp4530 underfill. 3) csp reflow profile, per jesd22 - a113d. 4) when designing - in the SIT1534 in the 2012 smd package into noisy, high em environments, we recommend the following design guidelines: ? place oscillator as far away from em noise sources as possible (e.g., high - voltage 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. ? for details, please refer to the pcb l ayout g uidelines in an10006 . 5) for additional manufacturing guidelines and marking/tape - reel instructions, refer to: sitime manufacturing notes .
sit 1534 ultra - small, ultra - low power 1 hz C 32.768 khz programmable oscillator rev 1.31 page 11 of 12 www.sitime.com ordering information part number characters in blue represent the customer specific options. the other characters in the part number are fixed. the following examples illustrate how to select the appropriate temp range and output voltage requirements: example 1: SIT1534ai - j4 - d14 - 08.192 1) industrial temp & corresponding 100 ppm frequency stability 2) output swing requirements: a) output frequency = 8.192 khz b) d = dc - coupled receiver c) 1 = v oh = 1.1v d) 4 = v ol = 0.4v example 2: SIT1534ac - j5 - aa5 - 00.001 1) commercial temp & corresponding 75 ppm frequency stability 2) output swing requirements: a) output frequency = 1 hz b) a = ac - coupled receiver c) a = ac - coupled receiver d) 5 = 500mv swing table 6 . acceptable v oh /v ol nanodrive ? levels [ 7 ] nanodrive v oh (v) v o l (v) swing (mv) comments d26 1.2 0.6 600 5 5 1.8v logic compatible d14 1.1 0.4 700 5 5 1.8v logic compatible d74 0.7 0.4 300 5 5 xtal compatible aa3 n/a n/a 300 5 5 xtal compatible note: 7. if these available options do not accommodate your application, contact factory for other nanodrive options. s i t 1 5 3 4 a i - j 4 - d 1 4 - 0 8 . 1 9 2 s p a r t f a m i l y s i t 1 5 3 4 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 t a p e a n d r e e l c : c o m m e r c i a l , - 1 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 f r e q u e n c y s t a b i l i t y 4 : 1 0 0 p p m ( - 4 0 t o 8 5 o c o n l y ) 5 : 7 5 p p m ( - 1 0 t o 7 0 o c o n l y ) o u t p u t v o l t a g e s e t t i n g d c c : l v c m o s o u t p u t n a n o d r i v e ? r e d u c e d s w i n g o u t p u t r e f e r t o t a b l e 2 f o r o u t p u t s e t t i n g o p t i o n s h : 2 . 0 m m x 1 . 2 m m s m d 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 1 6 . 3 8 4 0 8 . 1 9 2 0 4 . 0 9 6 0 2 . 0 4 8 0 1 . 0 2 4 0 0 . 5 1 2 0 0 . 2 5 6 0 0 . 1 2 8 0 0 . 0 6 4 0 0 . 0 3 2 0 0 . 0 1 6 0 0 . 0 0 8 0 0 . 0 0 4 0 0 . 0 0 2 0 0 . 0 0 1 a : a c - c o u p l e d s i g n a l p a t h d : d c - c o u p l e d s i g n a l p a t h
sit 1534 ultra - small, ultra - low power 1 hz C 32.768 khz programmable oscillator rev 1.31 page 12 of 12 www.sitime.com table 7 . revision history version release date change summary 1.0 09/03/2014 rev 0.9 preliminary to rev 1.0 production release added start - up time at t a = 85c added typical operating plots labeled 25c frequency stability as frequency tolerance added manufacturing guidelines section 1.1 11/25/2014 added 2012 smd package design/mfg guidelines 1.2 01/05/2016 updated nanodrive options 1.3 04/03/2016 added sitime alternate landing pattern option update note 6 1.31 0 1/ 18 /201 8 updated logo and company address 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 2014 - 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) 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 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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