Part Numbering Guide for Crystals
Part Numbering Guide for Oscillators
A timing device that consists of a crystal and an oscillation circuit, providing an output waveform at a specific reference frequency.
A kind of oscillator that has the output frequency change with a voltage change at the control pin of the oscillator.
A kind of oscillator that adjusts the frequency for temperature variation and commonly has an outside adjustment for calibration frequency periodically. This is to compensate for the aging of the crystal over time.
A kind of Oscillator that uses an oven to stabilize the frequency variation.
The specified reference frequency of the oscillator, typically specified in Megahertz and Kilohertz.
The amount of frequency deviation from center frequency associated with a set of operation conditions, expressed in parts per million (ppm). These conditions include: Operating Temperature Range, Supply Voltage and Output Load.
The permissible deviation, from the nominal frequency at the reference temperature (usually 25° C)
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Termperature range where specification characteristics are fulfilled. This needs to be specified carefully as it impacts cost.
Temperature range where specification characteristics can be maintained for discharged state (no input of voltage, current, or power). Exposure to temperatures over this level may result in characteristic degradation or destruction.
Amount of frequency drift when operated under the specified conditions for a specified length of time.
Defined as the Ouptut Voltage Logic High or "Logic 1" and the Output Voltage Logic Low or "Logic 0" Voltage "0" level (max.): +0.4VDC TTL, +0.5VDC HCMOS for Vdd=5VDC (Vdd: Supply Voltage) Voltage "1" level (min.): +2.5VDC TTL, +4.5VDC HCMOS for Vdd=5VDC
An oscillator with this feature allows the output to be placed into a high impedance state. This feature is activated by the application of a logic control voltage to pin 1 of the oscillator.
The DC input voltage necessary for oscillator operation. Currently 5VDC is commonly used, with 3.3VDC being used in portable equipment.
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The amount of current consumption by an oscillator from the power supply, typically specified in milliamps.
The Rise Time is defined as the transition time from an output logic low to an output logic high. The Fall Time is defined as the transition time from an output logic high to an output logic low.
The measure of output waveform uniformity. The ratio of full and half cycles. For CMOS loading duty is rated at 1/2 VDC, and for TTL loading at 1.4 VDC.
The frequency range from the nominal frequency over which the ouput frequency of a VCXO under reference conditions can be changed by means of an external DC control voltage, expressed in ppm.
Defined as the % variation in output frequency versus control voltage from a best fit straight line.
The specific time from oscillator power-up to the time the oscillator reaches steady oscillation.
The capacity of oscillator to drive other devices or the fan out. TTL devices are specified in number of gates that can be driven. CMOS outputs are specified in pF.