SiT1533 Preliminary Ultra-Low Power 32.768 kHz XTAL Replacement in 2.0 x 1.2 mm SMD The Smart Timing Choice The Smart Timing Choice Features Applications Small SMD package: 2.0 x 1.2 mm (2012)[1] Mobile Phones Pin-compatible to 2012 XTAL SMD package Tablets Ultra-low power: <1A Health and Wellness Monitors Supports coin-cell or super-cap battery backup voltages Fitness Watches Vdd supply range: 1.5V to 3.63V over -40C to +85C Sport Video Cams Oscillator output eliminates external load caps Wireless Keypads NanoDriveTM programmable output swing for lowest power Ultra-Small Notebook PC Internal filtering eliminates external Vdd bypass cap Pulse-per-Second (pps) Timekeeping Fixed 32.768 kHz output frequency RTC Reference Clock <20 PPM initial stability Battery Management Timekeeping <100 PPM stability over -40C to +85C Pb-free, RoHS and REACH compliant Note: 1. For the smallest 32 kHz XO in CSP (1.2mm2), consider the SiT1532 Electrical Characteristics Parameter Fixed Output Frequency Symbol Min. Typ. Max. Unit Condition Frequency and Stability 32.768 kHz Fout Frequency Stability TA = 25C, Vdd: 1.5V - 3.63V 20 75 Frequency Stability [2] F_stab 100 PPM 250 25C Aging Operating Supply Voltage -3 Vdd Power Supply Reset Voltage Reset Core Operating Current [3, 4] Idd 1.2 3 PPM Supply Voltage and Current Consumption TA = 10C to +70C 3.63 V 1.5 3.63 0.3 V Idd_out Power-Supply Ramp t_Vdd_ Ramp TSTART-UP at Power-up T_start Commercial Temperature Industrial Temperature T_use 0.065 150 -10 -40 TA = -40C to +85C V 0.9 Output Stage Operating Current[3] TA = -10C to +70C, Vdd: 1.5V - 3.63V. Stability includes initial, power supply, and temperature stability components. TA = -40C to +85C, Vdd: 1.5V - 3.63V. Stability includes initial, power supply, and temperature stability components. TA = 10C to +70C, Vdd: 1.2V - 1.5V. Stability includes initial, power supply, and temperature stability components. 1st Year TA = 25C, Vdd: 1.5V - 3.63V. No load TA = -10C to +70C, Vdd max: 3.63V. No load TA = -40C to +85C, Vdd max: 3.63V. No load TA = -40C to +85C, Vdd: 1.5V - 3.63V. No load 1.3 1.35 A 0.125 A/Vpp 100 ms TA = -40C to +85C, 0 to 100% Vdd 300 ms TA = -40C to +85C Operating Temperature Range 70 C 85 C Output Voltage High LVCMOS Output Option, TA = -40C to +85C, typical value is TA = 25C tr, tf 100 200 ns 10-90%, 15 pF load, Vdd = 1.5V to 3.63V DC 48 52 % Vdd: 1.5V - 3.63V. IOH = -10A, 15 pF VOH 90% V Output Voltage Low VOL Output Rise/Fall Time Output Clock Duty Cycle Output Rise/Fall Time Output Clock Duty Cycle AC-coupled Programmable Output Swing DC-Biased Programmable Output Voltage High Range DC-Biased Programmable Output Voltage Low Range tf, tf DC 10% V Vdd: 1.5V - 3.63V. IOL = 10A, 15 pF NanoDriveTM Programmable, Reduced Swing Output 200 ns 10-90%, 15 pF Load 48 52 % V_sw 0.25 0.80 V Vdd: 1.2V - 3.63V, 15 pF Load, 10 pF, IOH / IOL = 0.2uA VOH 0.5 1.20 V Vdd: 1.2V - 3.63V. IOH = -0.2A, 10 pF Load VOL 0.35 0.80 V Vdd: 1.2V - 3.63V. IOH = 0.2A, 10 pF Load Notes: 2. 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. 4. To derive total operating current (no load), add core operating current + (0.065 A/V) * (peak-to-peak output Voltage swing). SiTime Corporation Rev 0.77 990 Almanor Avenue Sunnyvale, CA 94085 (408) 328-4400 www.sitime.com Revised July 18, 2013 SiT1533 Ultra-Low Power 32.768 kHz XTAL Replacement in 2.0 x 1.2 mm SMD The Smart Timing Choice The Smart Timing Choice Electrical Characteristics (continued) Parameter Symbol Min. Typ. Max. Unit Condition Jitter Performance (TA = 25C, Vdd = 1.5V to 2.0V, unless otherwise stated) Period Jitter T_djitt 45 nsRMS N = 10,000 Pin Configuration Pin Symbol I/O Functionality No Connect. Will not respond to any input signal. This pin is typically connected to the receiving IC's X Out pin. In this case, the SiT1533 will not be affected by the signal on this pin. 1 NC No Connect, don't care 2 GND Power Supply Ground 3 4 CLK Out Vdd SMD Package (Top View) Vdd Connect to ground. OUT Oscillator clock output. The CLK Out is typically connected to the receiving IC's X IN pin. The SiT1533 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. Power Supply Connect to power supply 1.5V Vdd 3.63V for operation over -40C to +85C temperature range. Under normal operating conditions, Vdd does not require external bypass/decoupling capacitor(s). Contact factory for applications that require a wider operating supply voltage range. 4 NC 1 CLK Out 3 2 GND System Block Diagram MEMS Resonator NC Control Sustaining Amp GND Regulators Trim Prog Ultra-Low Power PLL Divider Vdd Prog Ultra-Low Power Driver CLK Out Figure 1. Absolute Maximum Attempted operation outside the absolute maximum ratings of the part 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 Symbol Power Supply Voltage Range (Vdd) Test Condition Vdd Value ESD Protection HBM 100pF, 1.5k ESD Protection CDM, 25C 750 ESD Protection MM, 25C 200 Power Supply Voltage Range (Vdd) Unit -0.5 to 4 Vdd 2000 -0.5 to 4 Latch-up Tolerance JESD78 Compliant Mechanical Shock Resistance F/F Mil 883, Method 2002 TBD g Mechanical Vibration Resistance F/F Mil 883, Method 2005 TBD g 2012 SMD Junction Temperature TBD Storage Temperature -65C to 150C Thermal Consideration Package 2012 SMD Rev. 0.77 JA, 4 Layer Board (C/W) JA, 2 Layer Board (C/W) JC, Bottom (C/W) TBD Page 2 of 7 www.sitime.com SiT1533 Ultra-Low Power 32.768 kHz XTAL Replacement in 2.0 x 1.2 mm SMD The Smart Timing Choice The Smart Timing Choice Description Frequency Stability The SiT1533 is an ultra-small and ultra-low power 32.768 kHz oscillator optimized for mobile and other battery-powered applications. The SiT1533 is pin-compatible and footprint compatible to existing 2012 XTALs when using the SiTime solder-pad layout (SPL). And unlike standard oscillators, the SiT1533 features NanoDriveTM, a factory programmable output that reduces the voltage swing to minimize power. The SiT1533 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, the SiT1533 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 3.63V. Contact SiTime for applications that require a wider supply voltage range >3.63V, or lower operating frequency below 32 kHz. The 1.2V to 3.63V 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. Power Supply Noise Immunity XTAL Footprint Compatibility (SMD Package) The SiT1533 is a replacement to the 32 kHz XTAL in the 2.0 x 1.2 mm (2012) package. Unlike XTAL resonators, SiTime's silicon MEMS oscillators require a power supply (Vdd) and ground (GND) pin. Vdd and GND pins are conveniently placed between the two large XTAL pins. When using the SiTime Solder Pad Layout (SPL), the SiT1533 footprint is compatible with existing 32 kHz XTALs in the 2012 SMD package. Figure 2 shows the comparison between the quartz XTAL footprint and the SiTime footprint. For applications that require the smallest footprint solution, consider the SiT1532 XO available in a 1.2mm2 CSP. Quartz SiTime X OUT Connect to X OUT or NC 1 GND 2 4 VDD 3 X IN Clock Out Connect to X IN Top View Top View The SiT1533 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 simplifies 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. Output Voltage For low-power applications that drive directly into a chip-set's XTAL input, the reduced swing output is ideal. SiTime's unique NanoDriveTM, 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 SiT1533 output swing is customer specific and factory programmed between 250 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 500 mV and 1.2V in 100 mV increments. Similarly, VOL programming range is between 350 mV and 800 mV. For DC-biased NanoDriveTM output configuration, the minimum VOL is limited to 350mV. For example, 1.1V VOH and 400mV VOL is acceptable, but 1.0V VOH and 350mV VOL is not acceptable. Contact SiTime for programming support. Figure 2. SiT1533 Footprint Compatibility with Quartz XTAL Footprint (5) 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. Rev. 0.77 Page 3 of 7 www.sitime.com SiT1533 Ultra-Low Power 32.768 kHz XTAL Replacement in 2.0 x 1.2 mm SMD The Smart Timing Choice The Smart Timing Choice 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 SiT1533, 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 Supply Current (no load) = Idd Core + (65nA/V)(Voutpp) Example 1: Full-swing LVCMOS * Vdd = 1.8V * Idd Core = 900nA (typ) * Voutpp = 1.8V Supply Current = 900nA + (65nA/V)(1.8V) = 1047nA Example 2: NanoDriveTM Reduced Swing * Vdd = 1.8V * Idd Core = 900nA (typ) * Voutpp (Programmable) = VOH - VOL = 1.1V - 0.6V = 500mV Supply Current = 900nA + (65nA/V)(0.5V) = 832nA Rev. 0.77 Total Current = Idd Core + Idd Output Driver (65nA/V*Voutpp) + Load Current (C*V*F) Example 1: Full-swing LVCMOS * Vdd = 1.8V * Idd Core = 900nA * Load Capacitance = 10pF * Idd Output Driver: (65nA/V)(1.8V) = 117nA * Load Current: (10pF)(1.8V)(32.768kHz) = 590nA * Total Current = 900nA+117nA+590nA = 1.6A Example 2: NanoDriveTM Reduced Swing * Vdd = 1.8V * Idd Core = 900nA * Load Capacitance = 10pF * Voutpp (Programmable): VOH - VOL = 1.1V - 0.6V = 500mV * Idd Output Driver: (65nA/V)(0.5V) = 33nA * Load Current: (10pF)(0.5V)(32.768kHz) = 164nA * Total Current = 900nA + 33nA + 164nA = 1.1A Page 4 of 7 www.sitime.com SiT1533 Ultra-Low Power 32.768 kHz XTAL Replacement in 2.0 x 1.2 mm SMD The Smart Timing Choice The Smart Timing Choice Dimensions and Patterns Package Size - Dimensions (Unit: mm) Recommended Land Pattern (Unit: mm) SiTime Only SPL 2.0 x 1.2 mm SMD #4 #4 #3 #1 #3 #1 XTAL Compatible SPL #2 Rev. 0.77 #2 Page 5 of 7 www.sitime.com SiT1533 Ultra-Low Power 32.768 kHz XTAL Replacement in 2.0 x 1.2 mm SMD The Smart Timing Choice The Smart Timing Choice Ordering Information Part number characters in blue represent the customer specific options. The other characters in the part number are fixed. Here are guidelines to select the correct output voltage. 1) For XTAL replacement applications that will keep the chipset oscillator enabled, configure the NanoDriveTM output for a swing similar to the XTAL, approximately 250mV. SiT1533AI-H4-AA2-32.768 2) For XTAL replacement applications that will disable the chipset oscillator, configure the output with one of the following: * For VDD = 1.8V: SiT1533AI-H4-D14-32.768 * For VDD > 1.8V: SiT1533AI-H4-DCC-32.768 SiT1533AI-H4-D14-32.768S Packaging "S": 8 mm Tape & Reel, 10ku reel "D": 8 mm Tape & Reel, 3ku reel "E": 8 mm Tape & Reel, 1ku reel Part Family "SiT1533" Blank for Bulk Revision Letter "A": is the revision Output Clock Frequency 32.768 kHz Temperature Range "C": Commercial, -10 to 70C "I": Industrial, -40 to 85C DC-coupled Output VOL or AC Swing "2": 250mV "3": 300mV "4": 400mV "5": 500mV "6": 600mV "7": 700mV "8": 800mV "C": rail-to-rail LVCMOS Package Size 2.0 mm x 1.2 mm SMD Frequency Stability "5": 75 PPM (-10 to 70C only) "4": 100 PPM (-40 to 85C only) AC- or DC-coupled "A": AC-coupled Signal Path Rx DC-coupled Output VOH "D": DC-coupled Signal Path or Rail-to-Rail LVCMOS "5": 500mV "6": 600mV "7": 700mV "8": 800mV "9": 900mV "0": 1.00V "1": 1.10V "2": 1.20V "A": AC-coupled Receiver "C": rail-to-rail LVCMOS The following examples illustrate how to select the appropriate temp range and output voltage requirements: Example 1: SiT1533AI-H4-D14-32.768 * 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. * Output swing requirements: a) "D" = DC-coupled receiver b) "1" = VOH = 1.1V c) "4" = VOL = 0.4V Example 2: SiT1533AC-H5-AA2-32.768 * 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. * Output swing requirements: a) "A" = AC-coupled receiver b) "A" = AC-coupled receiver c) "2" = 250mV swing Rev. 0.77 Page 6 of 7 www.sitime.com SiT1533 Ultra-Low Power 32.768 kHz XTAL Replacement in 2.0 x 1.2 mm SMD The Smart Timing Choice The Smart Timing Choice (c) SiTime Corporation 2013. The information contained herein is subject to change at any time without notice. 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