SIT1552AC-JE-DCC-32.768G

SiT1552 Smallest (1.2 mm2), Ultra-Low Power, 32.768 kHz MEMS TCXO Smallest (1.2mm2), Ultra-Low Power, 32.768 kHz MEMS TCXO Features ◼ ◼ ◼ ◼ ◼ ◼ ◼ ◼ Applications 32.768 kHz ±5, ±10, ±20 ppm frequency stability options over temp World’s smallest TCXO in a 1.5 x 0.8 mm CSP Operating temperature ranges: ▪ 0°C to +70°C ▪ -40°C to +85°C Ultra-low power: 3.63 V, 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 32 kHz clock will give false readings with faster 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 capacitor 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. Rev 1.41 During initial power-up, the SiT1552 power-cycles internal 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 µA 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. Output Voltage The SiT1552 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 1.8V logic compatible, and requires a 1.2 V VIH and a 0.6 V VIL. Simply select SiT1552 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, 1.1V 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 SiT1552 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 SiT1552 NanoDrive programming code “AA8” in the part number. It is important to note that the SiT1552 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 SiT1552 Smallest (1.2 mm2), Ultra-Low Power, 32.768 kHz MEMS TCXO SiT1552 NanoDrive™ SiT1552 Full Swing LVCMOS Output Figure 3 shows a typical output waveform of the SiT1552 (into a 10 pF load) when factory programmed for a 0.70 V swing and DC bias (VOH/VOL) for 1.8 V logic: The SiT1552 can be factory programmed to generate fullswing LVCMOS levels. Figure 4 shows the typical waveform (Vdd = 1.8V) at room temperature into a 15 pF load. Example: ◼ NanoDrive™ part number coding: D14. VOH = 1.1 V, VOL = 0.4 V (V_sw = 0.70 V) Example: ◼ LVCMOS output part number coding is always DCC ◼ Example part number: SiT1552AI-JE-DCC-32.768 VOH = 1.1 V VSW = 0.7 V VOL = 0.4 V Figure 3. SiT1552AI-JE-D14-32.768 Output Waveform (10 pF load) Figure 4. LVCMOS Waveform (Vdd = 1.8 V) into 15 pF Load Table 4 shows the supported NanoDrive™ VOH, VOL factory programming options. Table 4. Acceptable VOH/VOL NanoDrive™ 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 25°C and will exhibit a tolerance of ±55 mV across Vdd and -40°C to 85°C operating temperature range. Rev 1.41 Page 5 of 12 www.sitime.com SiT1552 Smallest (1.2 mm2), Ultra-Low Power, 32.768 kHz MEMS TCXO 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. 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 Current = Idd Core + Idd Output Driver + Load Current Example 1: Full-swing LVCMOS ◼ ◼ ◼ Total Supply Current (no load) = Idd Core + Idd Output Driver Example 1: Full-swing LVCMOS ◼ ◼ ◼ ◼ ◼ Load Current: (10 pF)(1.8 V)(32768 Hz) = 590 nA Vdd = 1.8 V Idd Core = 990 nA (typ) Voutpp = 1.8 V Idd Output Driver: (Cdriver)(Vout)(Fout) = (3.5 pF)(1.8 V)(32768 Hz) = 206 nA Total Current = 990 nA + 206 nA + 590 nA = 1.79 µA Example 2: NanoDrive™ Reduced Swing ◼ ◼ Supply Current = 990 nA + 206 nA = 1.2 µA ◼ ◼ Example 2: NanoDrive™ Reduced Swing ◼ ◼ ◼ ◼ Vdd = 1.8 V Idd Core = 990 nA Load Capacitance = 10 pF Idd Output Driver: (Cdriver)(Vout)(Fout) = (3.5 pF)(1.8 V)(32768 Hz) = 206 nA ◼ Vdd = 1.8 V Idd Core = 990 nA (typ) Voutpp (D14) = VOH – VOL = 1.1 V - 0.4 V = 700 mV Vdd = 1.8 V Idd Core = 990 nA Load Capacitance = 10 pF Voutpp (D14): VOH – VOL = 1.1 V - 0.4 V = 700 mV Idd Output Driver: (Cdriver)(Vout)(Fout) = (3.5 pF)(0.7 V)(32768 Hz) = 80 nA Load Current: (10 pF)(0.7 V)(32.768 kHz) = 229 nA Total Current = 990 nA + 80 nA + 229 nA = 1.299 µA Idd Output Driver: (Cdriver)(Vout)(Fout) = (3.5 pF)(0.7 V)(32768 Hz) = 80 nA Supply Current = 990 nA + 80 nA = 1.07 µA Rev 1.41 Page 6 of 12 www.sitime.com SiT1552 Smallest (1.2 mm2), Ultra-Low Power, 32.768 kHz MEMS TCXO Typical Operating Curves Frequency Stability (PPM) (TA = 25°C, Vdd = 1.8 V, unless otherwise stated) Pre-reflow 5 ppm Option (E) 200 units Post 3x-reflow 5 ppm Option (E) 200 units Temperature (°C) Figure 5. Frequency Stability Over Temperature (Pre-Reflow) Output Stage Current (nA/Vpp) Figure 6. Frequency Stability Over Temperature (Post-Reflow) Vdd = 3.63 V Vdd = 1.5 – 1.8 V Vdd = 3.63 V Vdd = 1.5 – 1.8 V Temperature (°C) No Load Current (µA) Figure 7. Core Current Over Temperature Figure 8. Output Stage Current Over Temperature Vdd = 3.63 V (6 µA) Vdd = 1.5 – 1.8 V 350 ms Steady State 0.99 Time from Power ON [ms] Temperature (°C) Figure 9. Total Supply Current Over Temperature, LVCMOS (Core + LVCMOS Output Driver, No Load) Rev 1.41 Page 7 of 12 Figure 10. Start-up and Steady-State Current Profile www.sitime.com Smallest (1.2 mm2), Ultra-Low Power, 32.768 kHz MEMS TCXO Frequency Error (ppm) SiT1552 Vdd 1.8 V Vdd 3.3 V Noise Injection Frequency (Hz) Figure 11. Power Supply Noise Rejection (±150 mV Noise) Figure 12. Temperature Ramp Response VOH = 1.1 V VSW = 0.7 V VOL = 0.4 V Figure 13. NanoDrive™ Output Waveform Figure 14. LVCMOS Output Waveform (VOH = 1.1 V, VOL = 0.4 V; SiT1552AI-JE-D14-32.768) (Vswing = 1.8 V, SiT1552AI-JE-DCC-32.768, 10 pF Load) Rev 1.41 Page 8 of 12 www.sitime.com SiT1552 Smallest (1.2 mm2), Ultra-Low Power, 32.768 kHz MEMS TCXO 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 1.41 Page 9 of 12 www.sitime.com SiT1552 Smallest (1.2 mm2), Ultra-Low Power, 32.768 kHz MEMS TCXO 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 specification 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. Rev 1.41 Page 10 of 12 www.sitime.com SiT1552 Smallest (1.2 mm2), Ultra-Low Power, 32.768 kHz MEMS TCXO Ordering Information Part number characters in blue represent the customer specific options. The other characters in the part number are fixed. SiT1552AI-JE-DCC-32.768Q Part Family Packaging “SiT1552” “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 Revision Letter “A”: is the revision Blank for Bulk Samples in cut Tape & Reel strips Temperature Range “C”: Commercial, 0 to 70˚C Output Clock Frequency (kHz) “I”: Industrial, -40 to 85˚C 32.768 kHz Package Size “J”: 1.5 mm x 0.8 mm CSP Output Voltage Setting Over Temperature Stability Options NanoDrive™ Reduced Swing Output Refer to Table 5 for output setting options DCC: LVCMOS Output “E”: ±5 ppm “F”: ±10 ppm “1”: ±20 ppm “A”: AC-coupled signal path “D”: DC-coupled signal path The following examples illustrate how to select the appropriate temp range and output voltage requirements: Example 1: SiT1552AI-JE-DCC-32.768 ◼ Industrial temperature range ◼ CSP package ◼ 5 ppm frequency stability over temp ◼ Output swing requirements: a) b) c) d) Example 2: SiT1552AC-JF-D14-32.768 ◼ Commercial temperature range ◼ CSP package ◼ 10 ppm frequency stability over temp ◼ Output swing requirements: Output frequency = 32.769 kHz “D” = DC-coupled receiver “C” = LVCMOS output swing “C” = LVCMOS output swing a) b) c) d) Output frequency = 32.769 kHz “D” = DC-coupled receiver “1” = VOH = 1.1 V “4” = VOL = 400 mV Table 5. Acceptable VOH/VOL NanoDrive™ Levels[4] NanoDrive VOH (V) VOL (V) Swing (mV) D26 1.2 0.6 600 ±55 1.8 V logic compatible D14 1.1 0.4 700 ±55 1.8 V logic compatible D74 0.7 0.4 300 ±55 XTAL compatible AA3 n/a n/a 300 ±55 XTAL compatible Comments Note: 4. If these available options do not accommodate your application, contact SiTime for other NanoDrive options. Rev 1.41 Page 11 of 12 www.sitime.com SiT1552 Smallest (1.2 mm2), Ultra-Low Power, 32.768 kHz MEMS TCXO Table 6. Revision History Version Release Date Change Summary 1.0 Sep 17, 2014 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 Oct 14, 2014 Improved Start-up Time at Power-up spec Added 5 pF LVCMOS rise/fall time spec 1.2 Nov 10, 2014 Updated 5 pF LVCMOS rise/fall time spec 1.3 Nov 12, 2015 Removed NanoDrive from EC Table and Ordering Info 1.31 Jan 18, 2018 Updated SPL, page layout changes 1.32 Mar 15, 2018 Updated POD (Package Outline Drawing) Updated logo and company address, other page layout changes 1.4 Apr 12, 2018 Added the NanoDrive sections 1.41 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 © SiTime Corporation 2014-2020. 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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 1.41 Page 12 of 12 www.sitime.com