SiT1618B Standard Frequency, High Temperature Oscillator Features Applications 33 standard frequencies between 7.3728 MHz and 48 MHz Industrial, medical, automotive, avionics and other high temperature applications Supply voltage of 1.8 V or 2.5 V to 3.3 V continuous Industrial sensors, PLC, motor servo, outdoor Operating temperature from -40C to 125C. networking equipment, medical video cam, asset For -55C option, refer to SiT8920 and SiT8921 tracking systems, etc. Excellent total frequency stability as low as 20 ppm Low power consumption of 3.5 mA typical at 1.8 V LVCMOS/LVTTL compatible output 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 Instant samples with Time Machine II and Field Programmable oscillators RoHS and REACH compliant, Pb-free, Halogen-free and Antimony-free For AEC-Q100 oscillators, refer to SiT8924 and SiT8925 Electrical Specifications Table 1. Electrical Characteristics All Min and Max limits are specified over temperature and rated operating voltage with 15 pF output load unless otherwise stated. Typical values are at 25C and nominal supply voltage. Parameters Symbol Min. Typ. Max. Unit Condition Frequency Range Output Frequency Range f 33 standard frequencies between MHz Refer to Table 13 for the exact list of supported frequencies 7.3728 MHz and 48 MHz Frequency Stability and Aging st Frequency Stability F stab -20 +20 ppm Inclusive of Initial tolerance at 25C, 1 year aging at 25C, and variations over operating temperature, -25 +25 ppm rated power supply voltage and load. -30 +30 ppm -50 +50 ppm Operating Temperature Range Operating Temperature Range T use -40 +105 C Extended Industrial (ambient) -40 +125 C Automotive Supply Voltage and Current Consumption Supply Voltage Vdd 1.62 1.8 1.98 V 2.25 2.5 2.75 V 2.52 2.8 3.08 V 2.7 3.0 3.3 V 2.97 3.3 3.63 V 2.25 3.63 V Current Consumption Idd 3.8 4.7 mA No load condition, f = 20 MHz, Vdd = 2.8 V or 3.3 V 3.6 4.5 mA No load condition, f = 20 MHz, Vdd = 2.5 V 3.5 4.5 mA No load condition, f = 20 MHz, Vdd = 1.8 V OE Disable Current I OD 4.5 mA Vdd = 2.5 V to 3.3 V, OE = Low, Output in high-Z state 4.3 mA Vdd = 1.8 V. OE = Low, Output in high-Z state Standby Current I std 2.6 8.5 A Vdd = 2.8 V to 3.3 V, ST = Low, Output is weakly pulled down 1.4 5.5 Vdd = 2.5 V, ST = Low, Output is weakly pulled down A 0.6 4.0 A Vdd = 1.8 V, ST = Low, Output is weakly pulled down Rev 1.03 9 March 2021 www.sitime.com SiT1618B Standard Frequency, High Temperature Oscillator Table 1. Electrical Characteristics (continued) Parameters Symbol Min. Typ. Max. Unit Condition LVCMOS Output Characteristics Duty Cycle DC 45 55 % All Vdds Rise/Fall Time Tr, Tf 1.0 2.0 ns Vdd = 2.5 V, 2.8 V, 3.0 V or 3.3 V, 20% - 80% 1.3 2.5 ns Vdd = 1.8 V, 20% - 80% 1.0 3 ns Vdd = 2.25 V - 3.63 V, 20% - 80% Output High Voltage VOH 90% Vdd IOH = -4 mA (Vdd = 3.0 V or 3.3 V) IOH = -3 mA (Vdd = 2.8 V or Vdd = 2.5 V) IOH = -2 mA (Vdd = 1.8 V) Output Low Voltage VOL 10% Vdd IOL = 4 mA (Vdd = 3.0 V or 3.3 V) IOL = 3 mA (Vdd = 2.8 V or 2.5 V) IOL = 2 mA (Vdd = 1.8 V) 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 50 87 150 k Pin 1, OE logic high or logic low, or ST logic high 2 M Pin 1, ST logic low Startup and Resume Timing Startup Time T start 5 ms Measured from the time Vdd reaches its rated minimum value Enable/Disable Time T oe 162 ns f = 48 MHz. For other frequencies, T oe = 100 ns + 3 * clock periods Resume Time T resume 5 ms Measured from the time ST pin crosses 50% threshold Jitter RMS Period Jitter T jitt 1.6 2.5 ps f = 20 MHz, Vdd = 2.5 V, 2.8 V, 3.0 V or 3.3 V 1.9 4 ps f = 20 MHz, Vdd = 1.8 V Peak-to-peak Period Jitter T pk 12 20 ps f = 20 MHz, Vdd = 2.5 V, 2.8 V, 3.0 V or 3.3 V 14 30 ps f = 20 MHz, Vdd = 1.8 V RMS Phase Jitter (random) T phj 0.5 0.8 ps f = 40 MHz, Integration bandwidth = 900 kHz to 7.5 MHz 1.3 2 ps f = 40 MHz, Integration bandwidth = 12 kHz to 20 MHz Table 2. Pin Description Top View Pin Symbol Functionality 1 H : specified frequency output Output Enable L: output is high impedance. Only output driver is disabled. OE/ST /NC 1 H : specified frequency output 1 L: output is low (weak pull down). Device goes to sleep mode. Standby OE/ST /NC Supply current reduces to I std. 1 No Connect Any voltage between 0 and Vdd or Open : Specified frequency output. Pin 1 has no function. 2 GND Power Electrical ground 3 OUT Output Oscillator output 2 4 VDD Power Power supply voltage Figure 1. Pin Assignments Notes: ST 1. In OE or mode, 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. 2. A capacitor of value 0.1 F or higher between Vdd and GND is required. Rev 1.03 Page 2 of 18 www.sitime.com