SiT1533 20 ppm, Ultra-Low Power 32.768 kHz Quartz XTAL Replacement 2 Smallest (1.2mm ), Ultra-Low Power, 32.768 kHz MEMS TCXO Features Applications Small SMD package: Mobile Phones 1 2.0 x 1.2 mm (2012) Tablets Health and Wellness Monitors Pin-compatible to 2012 XTAL SMD package Fitness Watches Fixed 32.768 kHz output frequency Sport Video Cams <20 ppm frequency tolerance Ultra-low power: <1 A Wireless Keypads Supports coin-cell or super-cap battery backup voltages Ultra-Small Notebook PC Vdd supply range: Pulse-per-Second (pps) Timekeeping 1.5V to 3.63V over -40C to +85C RTC Reference Clock Oscillator output eliminates external load caps Battery Management Timekeeping Internal filtering eliminates external Vdd bypass cap NanoDrive programmable output swing for lowest power Pb-free, RoHS and REACH compliant Note: 2 1. For the smallest 32 kHz XO in CSP (1.2 mm ), consider the SiT1532. 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 2 Frequency Tolerance F tol 20 ppm T = 25C, post reflow, Vdd: 1.5V 3.63V. A 75 T = -10C to +70C, Vdd: 1.5V 3.63V. A 3 T = -40C to +85C, Vdd: 1.5V 3.63V. Frequency Stability F stab 100 ppm A 250 T = -10C to +70C, Vdd: 1.2V 1.5V. A st 25C Aging -1 1 ppm 1 Year Supply Voltage and Current Consumption T = -10C to +70C 1.2 3.63 V A Operating Supply Voltage Vdd 1.5 3.63 V T = -40C to +85C A 0.90 T = 25C, Vdd: 1.8V. No load A 4 T = -10C to +70C, Vdd max: 3.63V. No load Core Operating Current Idd 1.3 A A T = -40C to +85C, Vdd max: 3.63V. No load 1.4 A 4 Idd out 0.065 0.125 A/Vpp T = -40C to +85C, Vdd: 1.5V 3.63V. No load Output Stage Operating Current A T = -40C to +85C, 0 to 90% Vdd Power-Supply Ramp t Vdd Ramp 100 ms A T = -40C T +50C, valid output 180 300 5 A A t start ms Start-up Time at Power-up 450 T = +50C < T +85C, valid output A A Operating Temperature Range Commercial Temperature -10 70 C T use Industrial Temperature -40 85 C 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. Stability is specified for two operating voltage ranges. Stability progressively degrades with supply voltage below 1.5V. Measured peak-to-peak. Inclusive of Initial Tolerance at 25C, and variations over operating temperature, rated power supply voltage and load. 4. 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) * (peak-to-peak output Voltage swing). 5. Measured from the time Vdd reaches 1.5V. Rev 1.4 March 20, 2018 www.sitime.com SiT1533 20 ppm, Ultra-Low Power 32.768 kHz Quartz XTAL Replacement Table 1. Electrical Characteristics (continued) Parameter Symbol Min. Typ. Max. Unit Condition LVCMOS Output Option, T = -40C to +85C, typical values are at T = 25C A A 100 200 10-90% (Vdd), 15 pF load, Vdd = 1.5V to 3.63V Output Rise/Fall Time tr, tf ns 50 10-90% (Vdd), 5 pF load, Vdd 1.62V DC 48 52 % Output Clock Duty Cycle Output Voltage High VOH 90% V Vdd: 1.5V 3.63V. I = -10 A, 15 pF OH Output Voltage Low VOL 10% V Vdd: 1.5V 3.63V. I = 10 A, 15 pF OL NanoDrive Programmable, Reduced Swing Output 200 ns Output Rise/Fall Time tf, tf 30-70% (V /V ), 10 pF Load OL OH Output Clock Duty Cycle DC 48 52 % SiT1533 does not internally AC-couple. This output description 0.20 to AC-coupled Programmable is intended for a receiver that is AC-coupled. See Table 2 for V V sw Output Swing 0.80 acceptable NanoDrive swing options. Vdd: 1.5V 3.63V, 10 pF Load, I / I = 0.2 A. OH OL 0.60 to DC-Biased Programmable Vdd: 1.5V 3.63V. I = -0.2 A, 10 pF Load. See Table 1 for OH V VOH Output Voltage High Range 1.225 acceptable V /V setting levels. OH OL 0.35 to DC-Biased Programmable Vdd: 1.5V 3.63V. I = 0.2 A, 10 pF Load. See Table 1 for OL V VOL Output Voltage Low Range 0.80 acceptable V /V setting levels. OH OL Programmable Output Voltage -0.055 0.055 V T = -40C to +85C, Vdd = 1.5V to 3.63V. A Swing Tolerance ns Period Jitter T jitt 35 Cycles = 10,000, T = 25C, Vdd = 1.5V 3.63V RMS A Table 2. Pin Configuration SMD Package (Top View) SMD Pin Symbol I/O Functionality No Connect. Will not respond to any input signal. When interfacing to Vdd an MCUs XTAL input pins, this pin is typically connected to the 1 NC No Connect receiving ICs X Out pin. In this case, the SiT1533 will not be affected by the signal on this pin. If not interfacing to an XTAL oscillator, leave 4 pin 1 floating (no connect). NC 3 1 CLK Out Power Supply Connect to ground. All GND pins must be connected to power 2 GND Ground supply ground. 2 Oscillator clock output. When interfacing to an MCUs XTAL, the CLK Out is typically connected to the receiving ICs X IN pin. GND The SiT1533 oscillator output includes an internal driver. As a result, 3 CLK Out OUT the output swing and operation is not dependent on capacitive Figure 1. Pin Assignments loading. This makes the output much more flexible, layout independent, and robust under changing environmental and manufacturing conditions. 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). Internal power supply filtering will reject more than 4 Vdd Power Supply 150 mVpp with frequency components through 10 MHz. Contact SiTime for applications that require a wider operating supply voltage range. Rev 1.4 Page 2 of 13 www.sitime.com