SiT1532 Smallest Footprint (1.2mm2) CSP 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement Features Applications Smallest footprint in chip-scale (CSP): 1.5 x 0.8 mm Fixed 32.768 kHz <10 ppm frequency tolerance Ultra-low power: <1 A Directly interfaces to XTAL inputs Supports coin-cell or super-cap battery backup voltages Vdd supply range: 1.5 V to 3.63 V over -40C to +85C Oscillator output eliminates external load caps Internal filtering eliminates external Vdd bypass cap NanoDriveTM programmable output swing for lowest power Pb-free, RoHS and REACH compliant 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 Electrical Specifications Table 1. Electrical Characteristics Parameter Symbol Min. Typ. Max. Unit Condition Frequency and Stability Fixed Output Frequency Fout 32.768 kHz Frequency Stability Frequency Tolerance[1] F_tol Frequency Stability[2] F_stab 25C Aging -1 10 ppm TA = 25C, post reflow, Vdd: 1.5 V - 3.63 V 20 ppm 75 ppm TA = 25C, post reflow with board-level underfill, Vdd: 1.5 V - 3.63 V TA = -10C to +70C, Vdd: 1.5 V - 3.63 V 100 TA = -40C to +85C, Vdd: 1.5 V - 3.63 V 250 TA = -10C to +70C, Vdd: 1.2 V - 1.5 V 1 ppm 1st Year Supply Voltage and Current Consumption Operating Supply Voltage Core Operating Current [3] Vdd 1.2 3.63 V TA = -10C to +70C 1.5 3.63 V TA = -40C to +85C A TA = 25C, Vdd: 1.8 V. No load Idd 0.90 TA = -10C to +70C, Vdd max: 3.63 V. No load 1.3 TA = -40C to +85C, Vdd max: 3.63 V. No load 1.4 Output Stage Operating Current[3] Idd_out Power-Supply Ramp t_Vdd Ramp t_start Start-up Time at Power-up[4] 0.065 180 0.125 A/Vpp TA = -40C to +85C, Vdd: 1.5 V - 3.63 V. No load 100 ms Vdd Ramp-up from 0 to 90%, TA = -40C to +85C 300 ms TA = -40C TA +50C, valid output TA = +50C < TA +85C, valid output 450 Operating Temperature Range Commercial Temperature Industrial Temperature T_use -10 70 C -40 85 C 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 1.5 V. 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 1.5 V. Rev 1.28 November 23, 2020 www.sitime.com SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement Table 1. Electrical Characteristics (continued) Parameter Symbol Min. Typ. Max. Unit Condition LVCMOS Output Option, TA = -40C to +85C, typical values are at TA = 25C 100 Output Rise/Fall Time tr, tf Output Clock Duty Cycle DC 48 Output Voltage High VOH 90% Output Voltage Low VOL 200 50 52 10% ns 10-90% (Vdd), 15 pF load, Vdd = 1.5 V to 3.63 V 10-90% (Vdd), 5 pF load, Vdd 1.62 V % V Vdd: 1.5V - 3.63V. IOH = -10 A, 15 pF V Vdd: 1.5V - 3.63V. IOL = 10 A, 15 pF NanoDriveTM Programmable, Reduced Swing Output Output Rise/Fall Time tf, tf Output Clock Duty Cycle DC 48 200 ns 52 % 30-70% (VOL/VOH), 10 pF Load AC-coupled Programmable Output Swing V_sw 0.20 to 0.80 V SiT1532 does not internally AC-couple. This output description is intended for a receiver that is AC-coupled. See Table 5 for acceptable NanoDrive swing options. Vdd: 1.5 V - 3.63 V, 10 pF Load, IOH / IOL = 0.2 A. DC-Biased Programmable Output Voltage High Range VOH 0.60 to 1.225 V Vdd: 1.5 V - 3.63 V. IOH = -0.2 A, 10 pF Load. See Table 4 for acceptable VOH/VOL setting levels. DC-Biased Programmable Output Voltage Low Range VOL 0.35 to 0.80 V Vdd: 1.5 V - 3.63 V. IOL = 0.2 A, 10 pF Load. See Table 4 for acceptable VOH/VOL setting levels. V TA = -40C to +85C, Vdd = 1.5 V to 3.63 V. Programmable Output Voltage Swing Tolerance -0.055 0.055 Jitter Period Jitter T_jitt nsRMS 35 Cycles = 10,000, TA = 25C, Vdd = 1.5 V - 3.63 V Table 2. Pin Configuration Pin Symbol I/O 1, 4 GND Power Supply Ground 2 CLK Out OUT Functionality Connect to ground. Acceptable to connect pin 1 and 4 together. Both pins must be connected to GND. Oscillator clock output. The CLK can drive into a Ref CLK input or into an ASIC or chip-set's 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. Connect to power supply 1.2 V Vdd 3.63 V. Under normal operating conditions, Vdd does not require external bypass/decoupling capacitor(s). 3 Vdd Power Supply For more information about the internal power-supply filtering, see the Power Supply Noise Immunity section in the detailed description. CSP Package (Top View) GND 1 4 GND CLK Out 2 3 Vdd Figure 1. Pin Assignments Contact factory for applications that require a wider operating supply voltage range. Rev 1.28 Page 2 of 12 www.sitime.com SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement System Block Diagram MEMS Resonator GND GND Control Sustaining Amp Regulators Trim Prog Ultra-low Power PLL Divider Vdd Prog Ultra-low Power Driver CLK Out Figure 2. SiT1532 Block Diagram Table 3. Absolute Maximum Limits 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. Parameter Test Condition Continuous Power Supply Voltage Range (Vdd) Value Unit -0.5 to 3.63 V Short Duration Maximum Power Supply Voltage (Vdd) <30 minutes 4.0 V Continuous Maximum Operating Temperature Range Vdd = 1.5 V - 3.63 V 105 C Vdd = 1.5 V - 3.63 V, 30 mins 125 C 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 Short Duration Maximum Operating Temperature Range Latch-up Tolerance JESD78 Compliant Mechanical Shock Resistance Mil 883, Method 2002 10,000 Mechanical Vibration Resistance Mil 883, Method 2007 70 g 150 C 1508 CSP Junction Temperature Rev 1.28 Page 3 of 12 g www.sitime.com SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement The SiT1532 is the world's smallest, lowest power 32 kHz oscillator optimized for mobile and other battery-powered applications. SiTime's silicon MEMS technology enables the smallest footprint and chip-scale packaging. This device reduces the 32 kHz footprint by as much as 85% compared to existing 2.0 x 1.2 mm SMD XTAL packages. Unlike XTALs, the SiT1532 oscillator output enables greater component placement flexibility and eliminates external load capacitors, thus saving additional component count and board space. And unlike standard oscillators, the SiT1532 features NanoDriveTM, a factory programmable output that reduces the voltage swing to minimize power. The 1.2 V to 3.63 V operating supply voltage range makes it an ideal solution for mobile applications that incorporate a low-voltage, battery-back-up source such as a coin-cell or super-cap. SiTime's MEMS oscillators consist of MEMS resonators and a programmable analog circuit. Our MEMS resonators are built with SiTime's unique MEMS First(R) process. A key manufacturing step is EpiSeal(R) 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, SiTime's MEMS resonator die can be used like any other semiconductor die. One unique result of SiTime's MEMS First and EpiSeal manufacturing processes is the capability to integrate SiTime's 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 SiT1532 is factory calibrated (trimmed) to guarantee frequency stability to be less than 10 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, the SiT1532 temperature coefficient is extremely flat across temperature. The device maintains less than 100 ppm frequency stability over the full operating temperature range when the operating voltage is between 1.5 and 3.63 V as shown in Figure 3. Functionality is guaranteed over the 1.2 V - 3.63 V operating supply voltage range. However, frequency stability degrades below 1.5 V and steadily degrades as it approaches the 1.2 V minimum supply due to the internal regulator limitations. Between 1.2 V and 1.5 V, the frequency stability is 250 ppm max over temperature. When measuring the SiT1532 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. Rev 1.28 Contact SiTime for applications that require a wider supply voltage range >3.63 V or lower frequency options as low as 1 Hz. SiT153x Industrial Temp Specification Frequency Stability (ppm) Description SiT1532 10 ppm Max @ 25C Quartz XTAL -160 to -220 ppm Over Temp Temperature (C) Figure 3. SiTime vs. Quartz Power Supply Noise Immunity In addition to eliminating external output load capacitors common with standard XTALs, The SiT1532 includes special internal power supply filtering 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 greater than 150 mVpp magnitude and frequency components through 10 MHz. Output Voltage The SiT1532 has two output voltage options. One option is a standard LVCMOS output swing. The second option is the NanoDrive reduced swing output. Output swing is customer specific and programmed between 200 mV and 800 mV. For DC-coupled applications, output VOH and VOL are individually factory programmed to the customers' requirement. VOH programming range is between 600 mV and 1.225 V in 100 mV increments. Similarly, VOL programming range is between 350 mV and 800 mV. For example; a PMIC or MCU is internally 1.8 V logic compatible, and requires a 1.2 V VIH and a 0.6 V VIL. Simply select SiT1532 NanoDrive factory programming code to be "D14" and the correct output thresholds will match the downstream PMIC or MCU input requirements. Interface logic will vary by manufacturer and we recommend that you review the input voltage requirements for the input interface. For DC-biased NanoDrive output configuration, the minimum VOL is limited to 350 mV and the maximum allowable swing (VOH - VOL) is 750 mV. For example, 1.1 V VOH and 400 mV VOL is acceptable, but 1.2 V VOH and 400 mV VOL is not acceptable. When the output is interfacing to an XTAL input that is internally AC-coupled, the SiT1532 output can be factory programmed to match the input swing requirements. For example, if a PMIC or MCU input is internally AC-coupled and requires an 800 mV swing, then simply choose the SiT1532 NanoDrive programming code "AA8" in the part number. It is important to note that the SiT1532 does not include internal AC-coupling capacitors. Please see the Part Number Ordering section at the end of the datasheet for more information about the part number ordering scheme. Page 4 of 12 www.sitime.com SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement Power-up SiT1532 Full Swing LVCMOS Output The SiT1532 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 - 20 ms (to within 90% of Vdd). Start-up time is measured from the time Vdd reaches 1.5 V. For applications that operate between 1.2 V and 1.5 V, the start-up time will be typically 50 ms longer over temperature. The SiT1532 can be factory programmed to generate full-swing LVCMOS levels. Figure 5 shows the typical waveform (Vdd = 1.8 V) at room temperature into a 15 pF load. Example: LVCMOS output part number coding is always DCC SiT1532 NanoDriveTM Example part number: SiT1532AI-J4-DCC-32.768 Figure 4 shows a typical output waveform of the SiT1532 (into a 10 pF load) when factory programmed for a 0.70 V swing and DC bias (VOH/VOL) for 1.8 V logic: Example: NanoDriveTM part number coding: D14. Example part number: SiT1532AI-J4-D14-32.768 VOH = 1.1 V, VOL = 0.4 V (V_sw = 0.70 V) VOH = 1.1 V Figure 5. LVCMOS Waveform (Vdd = 1.8 V) into 15 pF Load VSW = 0.7 V VOL = 0.4 V Figure 4. SiT1532AI-J4-D14-32.768 Output Waveform (10 pF load) Table 4 shows the supported NanoDriveTM VOH, VOL factory programming options. Table 4. Acceptable VOH/VOL NanoDriveTM Levels NanoDrive VOH (V) VOL (V) Swing (mV) Comments D26 1.2 0.6 600 55 1.8V logic compatible D14 1.1 0.4 700 55 1.8V logic compatible D74 0.7 0.4 300 55 XTAL compatible AA3 n/a n/a 300 55 XTAL compatible The values listed in Table 4 are nominal values at 25C and will exhibit a tolerance of 55 mV across Vdd and -40C to 85C operating temperature range. Rev 1.28 Page 5 of 12 www.sitime.com SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement Calculating Load Current Total Supply Current with Load No Load Supply Current To calculate the total supply current, including the load, follow the equation listed below. Note the 30% reduction in power with NanoDriveTM. When calculating no-load power for the SiT1532, 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. Therefore, no-load operating supply current is broken into two sections; core and output driver. The equation is as follows: Total Current = Idd Core + Idd Output Driver (65nA/V*Voutpp) + Load Current (C*V*F) Example 1: Full-swing LVCMOS Total Supply Current (no load) = Idd Core + (65 nA/V)(Vout pp) Example 1: Full-swing LVCMOS Vdd = 1.8 V Idd Core = 900 nA Load Capacitance = 10 pF Idd Output Driver: (65 nA/V)(1.8 V) = 117 nA Load Current: (10 pF)(1.8 V)(32.768 kHz) = 590 nA Vdd = 1.8 V Idd Core = 900 nA (typ) Total Current = 900 nA + 117 nA + 590 nA = 1.6 A Voutpp = 1.8 V Example 2: NanoDriveTM Reduced Swing Supply Current = 900 nA + (65 nA/V)(1.8 V) = 1017 nA Example 2: NanoDriveTM Reduced Swing Vdd = 1.8 V Idd Core = 900 nA Vdd = 1.8 V Load Capacitance = 10 pF Idd Core = 900 nA (typ) Voutpp (D14): VOH - VOL = 1.1 V - 0.4 V = 700 mV Voutpp (D14) = VOH - VOL = 1.1 V - 0.4 V = 700 mV Idd Output Driver: (65 nA/V)(0.7 V) = 46 nA Load Current: (10 pF)(0.7 V)(32.768 kHz) = 229 nA Supply Current = 900 nA + (65 nA/V)(0.7 V) = 946 nA Total Current = 900 nA + 46 nA + 229 nA = 1.175 A Rev 1.28 Page 6 of 12 www.sitime.com SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement Typical Operating Curves (TA = 25C, Vdd = 1.8V, unless otherwise stated) 30 25 Number of Devices Min/Max Limit 20 15 10 5 -15 -10 -5 0 5 10 15 Temperature (C) Initial Tolerance (ppm) TA = 25C Post Reflow, No underfill Figure 7. Frequency Stability Over Temperature Figure 6. Initial Tolerance Histogram Temperature (C) Figure 9. Output Stage Current Over Temperature Voltage (V) Figure 8. Core Current Over Temperature when Vdd = 1.5 V Time (sec) Figure 10. Start-up Time Rev 1.28 Page 7 of 12 www.sitime.com SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement Frequency Error due to Power Supply Noise Injection, 150 mV Frequency Error (ppm) 10 Vdd 1.8 V 5 0 Vdd 3.3 V -5 -10 1k 10k 100k Noise Injection Frequency (Hz) 1M 10M Figure 11. Power Supply Noise Rejection (150 mV Noise) VOH = 1.1 V VSW = 0.7 V VOL = 0.4 V Figure 12. NanoDriveTM Output Waveform (VOH = 1.1 V, VOL = 0.4 V; SiT1532AI-J4-D14-32.768) Rev 1.28 Figure 13. LVCMOS Output Waveform (Vswing = 1.8 V, SiT1532AI-J4-DCC-32.768) Page 8 of 12 www.sitime.com SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement Dimensions and Patterns Package Size - Dimensions (Unit: mm) Recommended Land Pattern (Unit: mm) #4 #3 #2 #1 (soldermask openings shown with dashed line around NSMD pad) Recommended 4-mil (0.1mm) stencil thickness Rev 1.28 Page 9 of 12 www.sitime.com SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement Manufacturing Guidelines 1) No Ultrasonic Cleaning: Do not subject the SiT1532 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, but will cause a shift in the frequency tolerance, as specified in the datasheet electrical table. Tested with UF3810, UF3808, and FP4530 underfill. 3) Reflow profile, per JESD22-A113D. 4) For additional manufacturing guidelines and marking/ tape-reel instructions, refer to SiTime Manufacturing Notes. Rev 1.28 Page 10 of 12 www.sitime.com SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement Ordering Information Part number characters in blue represent the customer specific options. The other characters in the part number are fixed. SiT1532A I -J4-D14-32.768 Q Packaging Part Family "S": 8 mm Tape & Reel, 10 ku reel "Q": 8 mm Tape & Reel, 5 ku reel "D": 8 mm Tape & Reel, 3 ku reel "E": 8 mm Tape & Reel, 1 ku reel "SiT1532" Revision Letter "A": is the revision Samples in cut Tape & Reel strips Temperature Range "C": Commercial, -10 to 70C "I": Industrial, -40 to 85C Output Clock Frequency 32.768 kHz Package Size Output Voltage Setting 1.5 mm x 0.8 mm CSP DCC: LVCMOS Output Frequency Stability NanoDriveTM Reduced Swing Output Refer to Table 5 for output setting options "A": AC-coupled signal path "D": DC-coupled signal path "5": 75 ppm (-10 to 70C) "4": 100 ppm (-40 to 85C) The following examples illustrate how to select the appropriate temp range and output voltage requirements: Example 1: SiT1532AI-J4-D14-32.768 Example 2: SiT1532AC-J5-AA3-32.768 1) Industrial temp & corresponding 100 ppm frequency stability. Note, 100 ppm is only available for the industrial temp range, and 75 ppm is only available for the commercial temp range. 1) Commercial temp & corresponding 75 ppm frequency stability. Note, 100 ppm is only available for the industrial temp range, and 75 ppm is only available for the commercial temp range. 2) Output swing requirements: 2) Output swing requirements: a) "D" = DC-coupled receiver a) "A" = AC-coupled receiver b) "1" = VOH = 1.1 V b) "A" = AC-coupled receiver c) "4" = VOL = 400 mV c) "3" = 300 mV swing Table 5. Acceptable VOH/VOL NanoDriveTM Levels[5] NanoDrive VOH (V) VOL (V) Swing (mV) Comments D26 1.2 0.6 600 55 1.8V logic compatible D14 1.1 0.4 700 55 1.8V logic compatible D74 0.7 0.4 300 55 XTAL compatible AA3 n/a n/a 300 55 XTAL compatible Note: 5. If these available options do not accommodate your application, contact Factory for other NanoDrive options. Rev 1.28 Page 11 of 12 www.sitime.com SiT1532 Smallest Footprint (1.2mm2) CSP, 10 ppm Ultra-Low Power 32.768 kHz XTAL Replacement Table 6. Revision History Version Release Date 1.0 Sep 2, 2014 Change Summary Rev 0.9 Preliminary to Rev 1.0 Production Release Updated start-up time specification Added typical operating plots Separated initial tolerance spec for condition with and without underfill Added Manufacturing Guidelines section 1.1 Oct 14, 2014 Improved Start-up Time at Power-up spec Added 5pF LVCMOS rise/fall time spec 1.2 11/07/2014 Updated 5pF LVCMOS rise/fall time spec 1.25 Jun 3, 2016 Updated NanoDrive section Updated test conditions in the absolute maximum table 1.26 Mar 15, 2018 Updated SPL, page layout changes 1.27 Mar 15, 2018 Updated POD (Package Outline Drawing) Updated logo and company address, other page layout changes 1.28 Nov 23, 2020 Formatting, rev table date format, TempFlat MEMS logo and trademarks update Added Q-suffix to the Ordering table options SiTime Corporation, 5451 Patrick Henry Drive, Santa Clara, CA 95054, USA | Phone: +1-408-328-4400 | Fax: +1-408-328-4439 (c) SiTime Corporation 2014-2020. 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 product, (ii) misuse or abuse including static discharge, neglect or accident, (iii) unauthorized modification or repairs which have been soldered or altered 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. 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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. Rev 1.28 Page 12 of 12 www.sitime.com