SiT8944B 1 110 MHz, -55 to 125C, Endura Series Oscillator Features Applications Best acceleration sensitivity of 0.1 ppb/g Avionics systems Any frequencies between 1 MHz and 110 MHz accurate to Field communication systems 6 decimal places Telemetry applications Extended temperature range (-55C to 125C) Excellent total frequency stability as low as 20 ppm Supply voltage of 1.8V or 2.25V to 3.63V Low power consumption of 3.8 mA typical at 1.8V Standby mode for longer battery life LVCMOS/LVTTL compatible output AEC-Q100 qualified Industry-standard packages: 2.0 x 1.6, 2.5 x 2.0, 3.2 x 2.5, 5.0 x 3.2, 7.0 x 5.0 mm x mm RoHS and REACH compliant, Pb-free, Halogen-free and Antimony-free Contact SiTime for up-screening and LAT programs Electrical Characteristics 1,2 Table 1. Electrical Characteristics All Min and Max limits are specified over temperature and rated operating voltage with 15 pF output load unless otherwise sta ted. Typical values are at 25C and nominal supply voltage. Parameters Symbol Min. Typ. Max. Unit Condition Frequency Range Output Frequency Range f 1 110 MHz Refer to Tables 13 to 15 for a list supported frequencies Frequency Stability and Aging Frequency Stability F stab -20 +20 ppm Inclusive of Initial tolerance at 25C, 1st year aging at 25C, and variations over operating temperature, rated power -25 +25 ppm supply voltage and load (15 pF 10%) -30 +30 ppm -50 +50 ppm Operating Temperature Range Operating Temperature T use -40 +85 C AEC-Q100 Grade 3 Range (ambient) -40 +105 C AEC-Q100 Grade 2 -40 +125 C AEC-Q100 Grade 1 -55 +125 C Extended cold AEC-Q100 Grade1 Rugged Characteristics Acceleration (g) sensitivity, F g 0.1 ppb/g Low sensitivity grade total gamma over 3 axes 15 Hz to 2 kHz Gamma Vector MIL-PRF-55310, computed per section 4.8.18.3.1 Supply Voltage and Current Consumption Supply Voltage Vdd 1.62 1.8 1.98 V All voltages between 2.25V and 3.63V including 2.5V, 2.8V, 3.0V and 3.3V are supported 2.25 3.63 V Current Consumption Idd 4.0 4.8 mA No load condition, f = 20 MHz, Vdd = 2.25V to 3.63V 3.8 4.5 mA No load condition, f = 20 MHz, Vdd = 1.8V OE Disable Current I od 4.5 mA Vdd = 2.5V to 3.3V, OE = Low, Output in high Z state 4.3 mA Vdd = 1.8V, OE = Low, Output in high Z state Standby Current I std 2.6 A Vdd = 2.8V to 3.3V, ST = Low, Output is weakly pulled down 1.4 A Vdd = 2.5V, ST= Low, Output is weakly pulled down 0.6 A Vdd = 1.8V, ST= Low, Output is weakly pulled down Rev 1.00 July 24, 2020 www.sitime.com SiT8944B 1 110 MHz, -55 to 125C, Endura Series Oscillator 1,2 Table 1. Electrical Characteristics (continued) Parameters Symbol Min. Typ. Max. Unit Condition LVCMOS Output Characteristics Duty Cycle DC 45 55 % All Vdd levels Rise/Fall Time Tr, Tf 1.5 3 ns Vdd = 2.25V - 3.63V, 20% - 80% 1.3 2.5 ns Vdd = 1.8V, 20% - 80% Output High Voltage VOH 90% Vdd IOH = -4 mA (Vdd = 3.0V or 3.3V) IOH = -3 mA (Vdd = 2.8V and Vdd = 2.5V) IOH = -2 mA (Vdd = 1.8V) Output Low Voltage VOL 10% Vdd IOL = 4 mA (Vdd = 3.0V or 3.3V) IOL = 3 mA (Vdd = 2.8V and Vdd = 2.5V) IOL = 2 mA (Vdd = 1.8V) Input Characteristics Input High Voltage VIH 70% Vdd Pin 1, OE or ST Input Low Voltage VIL 30% Vdd Pin 1, OE or ST Input Pull-up Impedance Z in 100 k Pin 1, OE logic high or logic low, or STlogic high 2 M Pin 1, logic low ST Startup and Resume Timing Startup Time T start 5.5 ms Measured from the time Vdd reaches its rated minimum value Enable/Disable Time T oe 130 ns f = 110 MHz. For other frequencies, T oe = 100 ns + 3 * cycles Resume Time T resume 5 ms Measured from the time pin crosses 50% threshold ST Jitter RMS Period Jitter T jitt 1.6 2.5 ps f = 75 MHz, 2.25V to 3.63V 1.9 3.0 ps f = 75 MHz, 1.8V RMS Phase Jitter (random) T phj 0.5 ps f = 75 MHz, Integration bandwidth = 900 kHz to 7.5 MHz 1.3 ps f = 75 MHz, Integration bandwidth = 12 kHz to 20 MHz Notes: 1. All electrical specifications in the above table are specified with 15 pF output load and for all Vdd(s) unless otherwise stated. 2. The typical value of any parameter in the Electrical Characteristic table is specified for the nominal value of the highest voltage option for that parameter and at 25C temperature. Table 2. Pin Description Top View Pin Symbol Functionality 3 H : specified frequency output Output Enable L: output is high impedance. Only output driver is disabled. 1 4 OE/ST/NC VDD 3 H : specified frequency output 1 Standby L: output is low (weak pull down). Device goes to sleep mode. OE/ ST/NC Supply current reduces to I std. 3 Any voltage between 0 and Vdd or Open : Specified frequency No Connect 2 3 OUT GND output. Pin 1 has no function. 4 2 GND Power Electrical ground Output Oscillator output 3 OUT Figure 1. Pin Assignments 4 Power Power supply voltage 4 VDD Notes: 3. In OE or STmode, a pull-up resistor of 10 k or less is recommended if pin 1 is not externally driven. If pin 1 needs to be left floating, use the NC option. 4. A capacitor of value 0.1 F or higher between Vdd and GND is required. Rev 1.00 Page 2 of 15 www.sitime.com