SiTime, Silicon MEMS Oscillators and Clock Generators

Programmable Features for Best Flexibility

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SiTime's MEMS timing solutions have a flexible architecture that is supported by factory programmability. This architecture allows customers to order a device configured to meet their exact design specifications, and receive samples within one week and production volume within three to five weeks. Designers have the option to use the Time Machine II programmer to instantly program SiTime oscillators in their own lab or office to optimize system performance and quickly develop prototypes.

With access to this wide range of specifications and features, customers can eliminate multiple suppliers and qualification efforts. The result is lower cost of ownership and a simplified supply chain.


Widest Range of Features

SiTime has the industry’s broadest portfolio of timing solutions. Use our Part Number Generator to see the full range of features.

      Feature       Configuration Options
  • Customizable Frequency
  • 1 Hz to 625 MHz with up to 6 decimals of accuracy
  • Frequency Stability
  • ±1.5, ±2.5, ±3, ±5, ±10, ±20, ±25 or ±50 PPM
  • Temperature Range
  • 0 to +70°C, -10 to +70°C, -20 to +70°C, -40 to +85°C, -40 to +105°C, -40 to +125°C or -55 to +125°C
  • Supply Voltage
  • MHz LVCMOS devices: 1.8, 2.5 to 3.3V
  • Differential devices: 2.5 to 3.3V
  • kHz devices: 1.2 to 3.63V
  • Output Signaling Type
  • Single-ended devices: LVCMOS LVTTL or NanoDrive
  • Differential devices: LVPECL, LVDS, HCSL or CML
  • Industry-standard Packages
  • Special Packages
  • 2012, 2016, 2520, 5032 or 7050 SMD packages for drop-in replacement of quartz
  • 3225 SMD - World's thinnest oscillator package at 0.25 mm height
  • 1508 chip-scale package - World's smallest oscillator package
  • SOT23-5 - For highest board-level reliability
  • Special Functions
  • Spread spectrum (down and center spread) and digital control (DCXO)
  • Pull Range
  • Programmable from ±25 to ±1600 PPM with 1% linearity
    (Available in VCXO, VCTCXO and DCXO lines)
  • Drive Strength
  • Programmable high and low drive strength settings for best EMI or driving multiple loads
  • Control Input
  • Output enable, spread disable, standby or no connect

Programmable Frequency

SiTime oscillators offer any frequency within the operating range with up to 6 decimal places of accuracy. With custom frequencies, designers can increase system performance (microprocessor / FPGA applications) and reduce bit error rates (Ethernet applications). Samples and low-volume orders are customized and delivered within 1 week; production quantities are available in 3-5 weeks for most oscillator families. 

Frequency Stability

SiTime’s MEMS timing devices offer a range of frequency stability options. For applications that require ultra-stable frequency, SiTime offers ±1.5 PPM stability in TCXO and VCTXO families that operate over the full industrial temperature range. Within each product category (kHz, XO, VCXO, VCTCXO, etc.), a variety of frequency stability options are available to best meet the application requirement with the lowest cost.

Temperature Range

SiTime products are available in a variety of operating temperature ranges. These wide temperature ranges, combined with SiTime’s inherently robust and highly reliable design, ensures that devices are well suited for the application environment and available at the lowest cost. SiTime's high temperature families provide the widest combination of frequencies, stability and small package size – a combination not available from quartz suppliers.

Supply Voltage

Covering the most common input-output voltages used, SiTime’s MHz products can operate at 1.8 volts and at any voltage between 2.5 and 3.3 volts. SiTime's kHz products, which are optimized for battery-powered applications, operate between 1.2 and 3.63 volts. All of these voltage levels are available across the entire frequency range, a feature that quartz-based solutions cant offer. Because SiTime products are configured to operate at the required voltage, external components such as level translators or additional regulators are not required, reducing board space and cost.

Spread Spectrum

SiTime offers spread-spectrum capability with center-spread and down-spread options, as well as different values of spreading. This feature provides an excellent solution for easily solving EMI problems which are often detected at the last stage of product development. At this late stage, the only options available may be to redesign / relayout the board or to add shielding within the case, both of which are expensive. SiTime's spread-spectrum devices, which are pin-compatible with quartz oscillators, can solve EMI problems without system redesign or expensive shielding. Learn more about reducing EMI with Spread Spectrum Clock Oscillators.

Digital Control

Digitally-controlled oscillators (DCXOs) are ideal for jitter cleaning and fail-safe functions in high-speed applications. The features of these devices are controlled by programming appropriate values serially, in-system by using a single-pin (1-wire interface). DCXOs eliminate the need for an external digital-to-analog converter (DAC) in the control path. This reduces board complexity and improves performance, as system noise is much lower.

Pull Range

SiTime’s VCXOs, VCTCXOs and DCXOs offer the widest pull range (as much as ±25 to ±1600 PPM) with the industry's best linearity at 1%. The superior tuning slope (Kv) consistency and linearity of SiTime oscillators enable a host of benefits including simpler loop control in software controlled PLLs, faster calibration and lock time, more consistent PLL bandwidth over operating range, reduced modulation harmonics, tighter PLL bandwidth design and more robust system performance. Compared to quartz devices with pull range limited to ±200 PPM and linearity at 10%, SiTime's MEMS timing devices are 8 and 10 times better respectively.

Programmable Drive Strength Control

All of SiTime’s MHz products have programmable drive strength control using SoftEdge technology. This feature allows designers to accurately match the output impedance of the oscillator with the trace impedance of the board to reduce reflections. Higher drive strength can be selected to drive multiple loads and eliminate external buffers. Lower drive strength can be used to improve signal integrity and reduce EMI.

Field Programmable Prototyping

SiTime offers the Time Machine II, a complete programming kit for use with SiTime's field programmable timing devices. This kit allows system designers to quickly and easily program oscillators according to the specifications and configuration required. Using field programmable devices, available in a wide range of package sizes, operating temperatures and signally types, design-specific samples can be generated in less than a minute.

The specification that can be customized with the Time Machine II programmer include frequency (with 6 decimal places of accuracy), frequency stability, supply voltage, drive strength control, pull range (in VCXOs and DCXOs) and center/down spread (in SSXOs).