SiTime offers an extensive portfolio of ruggedized Endura™ oscillators for aerospace, defense, and industrial automation applications that demand ultra-high resiliency to a wide range of harsh environmental conditions. These devices deliver the lowest acceleration sensitivity, best shock and vibration resistance, high-reliability (>1.9 billion hours MTBF), and superior dynamic performance under airflow, thermal gradients, pressure, and power supply noise.
SiTime’s ruggedized devices can be factory-programmed to any combination of frequency, stability, and voltage within a wide range of parameters, eliminating the long lead times and customization costs associated with quartz products. All Endura MHz oscillators conform to MIL-PRF-55310 and MIL-STD-883 specifications. Standard or custom up-screening flows are available.
CATEGORIES
Ruggedized Super-TCXOs LVCMOS Ruggedized Oscillators Spread Spectrum Ruggedized Oscillators LVPECL / LVDS / HCSL Ruggedized Oscillators Digitally Controlled Ruggedized Oscillators Voltage-Controlled Ruggedized Oscillators 32 kHz & 1 Hz to 2.5 MHz Ruggedized Oscillators/TCXOs
Ruggedized Super-TCXOs
Endura ruggedized Super-TCXOs are tight stability (±0.05 ppm to ±2.5 ppm), 1 to 220 MHz precision oscillators, engineered to deliver the most stable timing under environmental stressors – airflow, rapid temperature change, shock, vibration, poor power supply, and EMI.
- Best acceleration sensitivity, 0.004 ppb/g (typ) – 50% better than quartz
- 30,000g mechanical shock and 70g vibration resistance
- Airflow and thermal shock resistant, 0.9 ppb/°C (ΔF/ΔT)
- Excellent Allen deviation (ADEV), 1.5e-11, 10s averaging time
- Low power supply noise rejection (PSNR), 0.2 ps/mV
- I2C digital frequency tuning eliminates external DAC and sensitivity to board noise
| Device | Datasheet | Frequency | Stability(PPM) | Output Type | Supply Voltage(V) | Temp. Range(°C) | Package Size(mm2) |
|---|---|---|---|---|---|---|---|
| SiT5146 | 1 to 60 MHz | ±0.5 ±1 ±2.5 | LVCMOS Clipped Sinewave | 2.5 2.8 3 3.3 | -20 to +70 -40 to +85 -40 to +105 -55 to +105 | 5.0 x 3.2 10-pin | |
| SiT5147 | 60 to 220 MHz | ±0.5 ±1 ±2.5 | LVCMOS | 2.5 2.8 3 3.3 | -20 to +70 -40 to +85 -40 to +105 | 5.0 x 3.2 10-pin | |
| SiT5346 | 1 to 60 MHz | ±0.1 ±0.2 ±0.25 | LVCMOS Clipped Sinewave | 2.5 2.8 3 3.3 | -20 to +70 -40 to +85 -40 to +105 | 5.0 x 3.2 10-pin | |
| SiT5348 | 1 to 60 MHz | ±0.05 | LVCMOS Clipped Sinewave | 2.5 2.8 3 3.3 | 0 to +70 | 5.0 x 3.2 10-pin | |
| SiT5349 | 60 to 220 MHz | ±0.05 | LVCMOS | 2.5 2.8 3 3.3 | 0 to +70 | 5.0 x 3.2 10-pin | |
| SiT5347 | 60 to 220 MHz | ±0.1 ±0.2 ±0.25 | LVCMOS | 2.5 2.8 3.0 3.3 | -20 to +70 -40 to +85 -40 to +105 | 5.0 x 3.2 10-pin |
LVCMOS Ruggedized Oscillators
SiTime offers ruggedized single-ended Endura oscillators for defense and aerospace applications with a wide range of features. These devices deliver the perfect combination of wide frequency range (1 to 137 MHz), excellent stability (±20 ppm), and wide temperature range (-55 to 125°C) – in any combination.
- Low acceleration sensitivity, 0.1 ppb/g
- Wide operating temperature, -55 to +125°C
- Industry-standard QFN packages, as small as 2.0 mm x 1.6 mm
- SOT23-5 leaded package for higher board-level reliability and manufacturability
- FlexEdge™ configurable rise/fall time for EMI reduction
| Device | Datasheet | Frequency | Stability(PPM) | Output Type | Supply Voltage(V) | Temp. Range(°C) | Package Size(mm2) |
|---|---|---|---|---|---|---|---|
| SiT2045 | 115 to 137 MHz | ±20 ±25 ±50 | LVCMOS | 1.8 2.5 to 3.3 | -40 to 105 (Grade 2) -40 to 125 (Grade 1) -55 to 125 (Ext. Cold Grade 1) | SOT23 (2.9x2.8) | |
| SiT2044 | 1 to 110 MHz | ±20 ±25 ±50 | LVCMOS | 1.8 2.5 to 3.3 | -40 to 105 (Grade 2) -40 to 125 (Grade 1) -55 to 125 (Ext. Cold Grade 1) | SOT23 (2.9x2.8) | |
| SiT8945 | 115 to 137 MHz | ±20 ±25 ±30 ±50 | LVCMOS | 1.8 2.5 to 3.3 | -40 to +105 -40 to +125 -55 to +125 | 2.0x1.6 2.5x2.0 3.2x2.5 5.0x3.2 7.0x5.0 | |
| SiT8944 | 1 to 110 MHz | ±20 ±25 ±30 ±50 | LVCMOS | 1.8 2.5 to 3.3 | -40 to +105 -40 to +125 -55 to +125 | 2.0x1.6 2.5x2.0 3.2x2.5 5.0x3.2 7.0x5.0 |
Spread Spectrum Ruggedized Oscillators
SiTime’s Endura EMI-reduction oscillators ensure emissions compliance through two techniques: spread spectrum clocking and rise/fall time adjustment of the clock signal. These ruggedized devices, engineered for harsh environments, have ultra-low acceleration sensitivity and high temp operation.
- EMI reduction up to 17 dB on fundamental frequency and 30 dB on harmonics
- Wide spread range, up to 4% pk-to-pk
- FlexEdge™ configurable rise/fall time options: 0.25 ns to 40 ns slew rates
- Low acceleration sensitivity, 0.1 ppb/g
- Wide operating temperature, -55 to +125°C
- Small industry-standard QFN packages, as small as 2.0 mm x 1.6 mm
| Device | Datasheet | Frequency | Stability(PPM) | Output Type | Supply Voltage(V) | Temp. Range(°C) | Package Size(mm2) |
|---|---|---|---|---|---|---|---|
| SiT9045 | 1 to 150 MHz | ±20 ±25 ±50 | LVCMOS | 1.8 2.25 to 3.3 | -55 to +125 | 2.0x1.6 2.5x2.0 3.2x2.5 |
LVPECL / LVDS / HCSL Ruggedized Oscillators
SiTime offers Endura high-performance differential oscillators for high reliability aerospace and defense applications. These ruggedized devices provide low jitter and power supply noise rejection (PSNR) in the presence of environmental hazards, such as shock, vibration, noisy power supply, and EMI.
- Low acceleration sensitivity, 0.1 ppb/g
- Low 0.21 ps RMS jitter (typ.) in small industry-standard packages
- ±10 ppm with better dynamic stability in harsh environmental conditions
- Precise frequency steering, digital tuning to ±5 ppt
- Any frequency from 1 MHz to 725 MHz with 6 decimal places of accuracy
| Device | Datasheet | Frequency | Stability(PPM) | Output Type | Supply Voltage(V) | Temp. Range(°C) | Package Size(mm2) |
|---|---|---|---|---|---|---|---|
| SiT9346 | 1 to 220 MHz | ±10 ±20 ±25 ±50 | LVCMOS LVPECL HCSL | 2.5 2.8 3 3.3 | -40 to +105 | 3.2x2.5 5.0x3.2 7.0x5.0 | |
| SiT9347 | 220 to 725 MHz | ±10 ±20 ±25 ±50 | LVPECL LVDS HCSL | 2.5 2.8 3 3.3 | -40 to +105 | 3.2x2.5 5.0x3.2 7.0x5.0 |
Digitally Controlled Ruggedized Oscillators
SiTime's Endura DCXOs enable users to program output frequency and pull frequency in-system using a digital interface (I2C or SPI), offering designers great flexibility for noiseless clock synchronization. This ruggedized family offers ultra-low acceleration sensitivity and low jitter.
- Ideal for replacing multiple timing components in systems that support multiple frequencies
- Any-frequency mode for programming output frequency via I2C or SPI from 1 MHz to 725 MHz
- Frequency pulling/tuning up to ±3200 ppm via I2C or SPI with 0.005 ppb resolution and <1% linearity
- Low 0.21 ps RMS (typ.) integrated phase jitter
- Low acceleration sensitivity, 0.1 ppb/g
| Device | Datasheet | Frequency | Stability(PPM) | Output Type | Supply Voltage(V) | Temp. Range(°C) | Package Size(mm2) |
|---|---|---|---|---|---|---|---|
| SiT3541 | 1 to 340 MHz | ±20 ±25 ±50 | LVPECL LVDS HCSL | 2.5 to 3.3 | -40 to +85 | 5.0 x 3.2 10-pin | |
| SiT3542 | 340 to 725 MHz | ±20 ±25 ±50 | LVPECL LVDS HCSL | 2.5 to 3.3 | -40 to +85 | 5.0 x 3.2 10-pin |
Voltage-Controlled Ruggedized Oscillators
SiTime MEMS VCXOs provide exceptional dynamic performance and high reliability for defense and aerospace applications. These ruggedized devices are engineered to maintain phase noise performance and frequency tuning accuracy in harsh environmental conditions.
- Any frequency from 1 MHz to 725 MHz in 1 Hz step
- Wide pull range, ±25 to ±3200 ppm, with <1% linearity
- Low jitter, 0.21 ps RMS (12k to 20MHz)
- Low power supply noise rejection (PSNR), 0.05 ps/mV
- Low acceleration sensitivity, 0.1 ppb/g
| Device | Datasheet | Frequency | Stability(PPM) | Output Type | Supply Voltage(V) | Temp. Range(°C) | Package Size(mm2) |
|---|---|---|---|---|---|---|---|
| SiT3343 | 220 to 725 MHz | ±25 ±30 ±50 | LVPECL LVDS HCSL | 2.5 2.8 3.0 3.3 | -40 to +105 | 3.2x2.5 5.0x3.2 7.0x5.0 | |
| SiT3342 | 1 to 220 MHz | ±15 ±25 ±35 ±50 | LVPECL LVDS HSCL | 2.5 2.8 3.0 3.3 | -40 to +105 | 3.2x2.5 5.0x3.2 7.0x5.0 |
32 kHz & 1 Hz to 2.5 MHz Ruggedized Oscillators/TCXOs
SiTime's ruggedized low-frequency devices are ultra-small, low-power solutions that provide new architectural options for applications where space, power, and reliability are critical. These devices use MEMS resonators that are manufactured using the latest generation of EpiSeal™ technology which hermetically seals the resonator, making it immune to external atmospheric elements.
- New EpiSeal resonators: impervious to all small-molecule gases
- Small footprint: 1.2 mm2 (1.5 x 0.8 mm) CSP
- Ultra-low power: as low as 4.5 μA
- Low jitter: as low as 2.2 ns integrated RMS phase jitter
- SiT1580 ±5-ppm TCXO: all-inclusive frequency stability for improved local timekeeping and system power
- SiT1581 ±50-ppm oscillator: all-inclusive frequency stability and wide frequency range
| Device | Datasheet | Frequency | Stability(PPM) | Output Type | Supply Voltage(V) | Temp. Range(°C) | Package Size(mm2) |
|---|---|---|---|---|---|---|---|
| SiT1580 | 32.768 kHz | ±5 | LVCMOS | 1.62 to 3.63 | -20 to +70 -40 to +85 | 1.5x0.8 | |
| SiT1581 | 1 Hz to 2.5 MHz | ±50 | LVCMOS | 1.62 to 3.63 | -20 to +70 -40 to +85 | 1.5x0.8 |
