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Categories  > Frequency Controlled Product > 2-Crystal Oscillators > Oscillator characteristics

Oscillator characteristics ( characteristics ) TECHNICAL TERMS The following technical terms are generally used for crystal clock oscillators. Nominal frequency: Nominal output frequency of a crystal oscillator Frequency stability: Deviation from the nominal output frequency including the frequency deviations due to manufacturing process, temperature, power source variation and load variation Operating temperature range: Temperature range satisfying the output frequency stability and output signal characteristics specifications. Absolute maximum rating: Maximum rated value assuring the normal operation of a crystal oscillator. Exceeding this value may result in the decrease in the reliability of a crystal oscillator or cause it to be broken. It is never allowed to exceed this value even if just once. Stand-by function: External digital signals perform the function of making a control so as to allow the oscillation signals to be outputted or prevent the oscillation output. Dual Output function: Allows the simultaneous output of the initial oscillation frequency and the initial oscillation frequency times (1/2)n (n: 1 to 8, positive interger)(Only the model 1129 and the model 1329 are capable of performing this function.) Power consumption: Current flowing from the power source terminals during the oscillation of a crystal unit (Source voltage: 5V) Rise time: Time interval from "L" level to "H" level of the output waveform. Refer to the output waveform for each type. Fall time: Time interval from "H" level to "L" level of the output waveform. Refer to the output waveform of each type. Fanout: Number of IC gates which can be connected to the output terminal of a crystal oscillator APPLICATION NOTE The crystal products require different handling from other electric components. Special attention should be paid to the following: 1. Crack caused by bending the lead The lead terminals are hermetically sealed by glass. If bent at the root of the terminals, a crack may occur and decrease quality due to insufficient air tightness. 2. Resistance to dropping These models are designed to be impactproof so that no damage occurs when dropped a height three times. However, if dropped from a desk etc., it is advisable to check their performance or contact us to check it. 3. Electrostatic protection These models employ C-MOS Ics for the active element. Please use them in static-free environments. 4. High temperature Normal operation cannot be guaranteed for these models at +125C (for 24 hours). Be sure that the units are kept within the specified temperature range. 5. Storage period for solderability The lead terminals are solder plated if stored for a long time, the solder may oxidize and reduce performance. It is advisable to avoid storing it form more than 6 months without assembling. 6. EMI The unit is contained in a hermetic metal package and is provided with a case earth to prevent electromagnetic interference. Careful attention should be paid to electromagnetic interference if it is used for a set. Among surface mounting type, we recommend 1600L series, 2500L series which are EMI Consider design. Please contact us concerning measures to be taken against electromagneic interference for a set. 7. Ultrasonic cleaning Basically, ultrasonic cleaning of a crystal oscillator is possible. But a crystal wafer may be broken depending upon mounting or cleaning conditions. Contact us prior to use. 8. Others In case of special cases, contact us. TECHNICAL TERMS The following technical terms are generally used for crystal clock oscillators. Nominal frequency: Nominal output frequency of a crystal oscillator Frequency stability: Deviation from the nominal output frequency including the frequency deviations due to manufacturing process, temperature, power source variation and load variation Operating temperature range: Temperature range satisfying the output frequency stability and output signal characteristics specifications. Absolute maximum rating: Maximum rated value assuring the normal operation of a crystal oscillator. Exceeding this value may result in the decrease in the reliability of a crystal oscillator or cause it to be broken. It is never allowed to exceed this value even if just once. Stand-by function: External digital signals perform the function of making a control so as to allow the oscillation signals to be outputted or prevent the oscillation output. Dual Output function: Allows the simultaneous output of the initial oscillation frequency and the initial oscillation frequency times (1/2)n (n: 1 to 8, positive interger)(Only the model 1129 and the model 1329 are capable of performing this function.) Power consumption: Current flowing from the power source terminals during the oscillation of a crystal unit (Source voltage: 5V) Rise time: Time interval from "L" level to "H" level of the output waveform. Refer to the output waveform for each type. Fall time: Time interval from "H" level to "L" level of the output waveform. Refer to the output waveform of each type. Fanout: Number of IC gates which can be connected to the output terminal of a crystal oscillator APPLICATION NOTE The crystal products require different handling from other electric components. Special attention should be paid to the following: 1. Crack caused by bending the lead The lead terminals are hermetically sealed by glass. If bent at the root of the terminals, a crack may occur and decrease quality due to insufficient air tightness. 2. Resistance to dropping These models are designed to be impactproof so that no damage occurs when dropped a height three times. However, if dropped from a desk etc., it is advisable to check their performance or contact us to check it. 3. Electrostatic protection These models employ C-MOS Ics for the active element. Please use them in static-free environments. 4. High temperature Normal operation cannot be guaranteed for these models at +125C (for 24 hours). Be sure that the units are kept within the specified temperature range. 5. Storage period for solderability The lead terminals are solder plated if stored for a long time, the solder may oxidize and reduce performance. It is advisable to avoid storing it form more than 6 months without assembling. 6. EMI The unit is contained in a hermetic metal package and is provided with a case earth to prevent electromagnetic interference. Careful attention should be paid to electromagnetic interference if it is used for a set. Among surface mounting type, we recommend 1600L series, 2500L series which are EMI Consider design. Please contact us concerning measures to be taken against electromagneic interference for a set. 7. Ultrasonic cleaning Basically, ultrasonic cleaning of a crystal oscillator is possible. But a crystal wafer may be broken depending upon mounting or cleaning conditions. Contact us prior to use. 8. Others In case of special cases, contact us.