Diodes Incorporated offers a comprehensive product portfolio of SaRonix-eCera™ quartz crystal resonators. Our broad selection of industry-standard packages includes HC-49/U, metal surface mount, UM-1, tubular, plastic-molded, and ceramic surface-mount. These crystals function as a primary component in a broad line of precision and commodity oscillators, as well as modular timing solutions, or may be specified for direct use in electronic applications.
The enter or nominal output frequency of a crystal oscillator.
Crystal oscillators are packaged in various styles from lead through holes to surface-mount types. Various sizes and functions are suitable for different applications.
The deviation from the nominal frequency in terms of parts per millions (ppm) at room temperature.(25°C±5°C)
The frequency band that the oscillator type or model can be offered.
The maximum allowable frequency deviation compared to the measured frequency at 25°C over the temperature window, i. e., 0°C to +70°C typical stability is 0.01% (100 ppm).
Temperature rang within which output frequency and other electrical, environmental characteristics meet the specifications.
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.
Not all obsolete parts will have a direct replacement. However, we recommended that you contact your regional sales office.
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
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.
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.
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.
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.
Part per million is used to measure the deviation of the output signal (+/-20 ppM = +/-0.002%).
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.
FIT and MTBF data can be found at Pericom's Quality webpage.
Lead (Pb)-Free and Green information can be found on individual datasheets or Pb-Free & Green Page.