Diodes Incorporated

Programmable Crystal Oscillator (XO)

The programmable NX Crystal Oscillator XO series incorporates a miniature AT-cut crystal resonator and highly flexible oscillator IC into standard 7.0 x 5.0 mm and 5.0 x 3.2, 3.2x2.5, and 2.5x2.0 mm ceramic packages.

Designed and tested to target high-frequency and low-jitter applications such as networking, storage, video, and other embedded applications, the programmable oscillator IC contains a very low jitter PLL and can therefore generate any frequency based on your needs. The flexibility of the oscillator IC also enables multiple output frequencies for these XO families. The dual and quad frequency options are available for each package size, thus providing options for supporting platform designs with easy configurable solutions.

Combining high performance and flexibility, our NX Crystal Oscillator families provide high-frequency outputs with jitter performance as low as 0.3ps (RMS). Not only are our NX clocks perfect for networking and telecom applications, but they are also great for applications that demand high-performance clock sources.

Related Links   

  • FCP Search Tool:  The Frequency Control Product (FCP) search tool lets you find the right products and datasheets for Quartz Crystal (XTAL) Resonators and Crystal Oscillators (XO).

Programmable Crystal Oscillator (XO) Details


  • CMOS: 10 to 212.5 MHz
  • LVPECL: 10 to 360 MHz (other high frequencies available upon request)
  • Low phase noise jitter: < 0.8ps (typ)
  • Fast rise/fall time for LVPECL: 350ps (max)
  • High precision and tight frequency stability
  • ±25 ppm to ±50 ppm
  • Industry-standard 7.0 x 5.0 mm and 5.0 x 3.2 mm packages
  • Pb-Free and RoHS/Green compliant
  • Temperature range: -20 ~ +70 ℃; -40 ~ +85 ℃
  • Available on tape & reel


  • Networking
  • Storage
  • Video
  • PON
  • Other embedded applications

Programmable Crystal Oscillator (XO) FAQs

Define Stability?

Parameter used to define the maximum deviation of the actual frequency from the specified nominal frequency over changes in operating conditions. Oscillator stability is usually rated as inclusive of temperature, load, initial calibration, supply, and aging effects.

Is there a replacement for an obsolete part?

Not all obsolete parts will have a direct replacement. However, we recommended that you contact your regional sales office.

What are the causes of jitter?

Jitter can be cause by: poor decoupling to the Vcc and GND, signal source with heavy jitter, slow edge rate which will provide additional time to introduce jitter to the signal. Additional information can be found in Application Note 24: Designing for Minimal Jitter when using Clock Buffers

What are the types of jitter?

There are several types of jitter, but the main ones are: cycle-to-cycle jitter, period jitter, half period jitter, and peak-to-peak jitter. Jitter terminology can be found in AB36: Jitter Measurement Techniques at Application Brief No. 36 or Application Note No. 27.

What is cycle-to-cycle jitter?

Cycle-to-cycle jitter is the difference in the clock's period between two consecutive cycles and is expressed in units of + pico-seconds. This is because it can be either leading or lagging from the ideal output waveform.

What is half-period jitter?

Half-Period Jitter is the measure of maximum change in a clock's output transition from its ideal position during one-half period. It is measured as: tjit(half-period) = thalf-period n – 1/2 ƒo, where ƒo is the frequency of the input signal.

What is Jitter?

Measurement of the deviation of a clock period from its ideal position as calculated with respect to the average operating frequency under a fixed set of operating conditions.

What is PPM?

Part per million is used to measure the deviation of the output signal (+/-20 ppM = +/-0.002%).

What is the lead finish for Pericom products? What about lead-free?

All Pericom's products that are not lead-free are composed of 85% Sn and 15% Pb. For lead-free products, they are composed of 100% matte Sn. Lead-free products are marked and ordered with the letter "E" suffix at the end of the part number.

What is XO or SO?

A crystal (or SAW) oscillator outputs a precise fixed-frequency clock signal at a specified nominal value, used for data and processor timing.

Where can I find Mean Time Before Failure (MTBF) or Failures In Time (FIT) values for Pericom products?

FIT and MTBF data can be found at Pericom's Quality webpage.

Where can I find the information on your Pb-free and "Green" packaging?

Lead (Pb)-Free and Green information can be found on individual datasheets or Pb-Free & Green Page.

Why is the marking on the FCT devices different from the datasheet?

Sometimes the speed grades and the package nomenclature for our FCT devices may be swapped around. Full explanation for nomenclature information can be found under Packaging Support Documentation.