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Quartz Crystal Oscillator ICs (XO), Crystal Clock Oscillators, and Low Power Oscillator Circuits

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IDT offers quartz-crystal oscillators (XOs) and FemtoClock® NG programmable oscillator ICs to meet the needs of virtually any application. The XL and XU families of crystal oscillator products are high performance, low jitter clock sources, featuring typical RMS phase jitter down to 300 fs and are offered in various frequencies, levels of performance, output types, stabilities, input voltages, packages, pin configurations, and temperature grades. FemtoClock NG devices are the choice of the advanced system designer seeking a clock source with high performance and unmatched flexibility in a standard quartz crystal oscillator footprint.

XL and XU High-performance Crystal Oscillator Families

IDT’s XL and XU crystal oscillators are available in HCMOS, LVPECL, LVDS, and HCSL outputs. The XU and XL families have 300 fs and 750 fs typ. RMS phase jitter (12 kHz – 20 MHz), respectively. Devices are offered with frequency stability options of ± 20 ppm, ± 25 ppm, ± 50 ppm, or ± 100 ppm and fast lead times for custom frequencies from 16 kHz to 1.5 GHz. These products feature industry-standard packages (3.2 x 2.5 mm, 5 x 3.2 mm, 7 x 5 mm) and pin-outs. The XU and XL from IDT have the performance, price, and delivery to meet your design requirements. Applications include: networking, communications, data I/O, storage, and servers.

Customize it: IDT XO Crystal Oscillator Custom Part Configuration Utility
Download Product Brief: XU & XL Family of High-Performance Crystal Oscillators

Programmable FemtoClock NG Crystal Oscillator Family

FemtoClock NG 5 x 7 mm devices are quartz crystal oscillators (<0.5 ps RMS) that provide LVPECL, LVDS and LVCMOS clocks with frequencies from 15.48 MHz to 1300 MHz. The devices use IDT's 4th generation fractional-feedback PLL technology and integrate the crystal within the package. Each device features a set of up to four user-defined frequencies that are pre-programmed from the factory. An additional I2C programming interface allows access to internal PLL registers for reconfiguring the output frequency. The VCXO (voltage controlled crystal oscillator) devices also allow configuration of the absolute pull-range (APR) from ±7.5 to ±757.5 ppm. Compatible with standard 6-pin 5 x 7 mm ceramic packages, these devices are an ideal alternative to classic crystal clock oscillators, SO, VCXOs and VCSOs, with the additional benefit of a 4-pin interface for output frequency programming. These clock oscillators can be ordered with integrated crystals with an accuracy of ±20, ±50 or ±100 ppm.


Fox Electronics, an IDT company, is a leading global supplier of frequency control products (FCPs). Fox’s low- power crystal oscillator product portfolio and leadership in the frequency control market, coupled with IDT’s frequency control products, and overall leadership in silicon timing, offer the industry’s most comprehensive one-stop shop for timing solutions and frequency control products. Click here to visit the Fox Electronics website, or click here to request Fox samples.

Low-noise, Low-Power Crystal Oscillators

IDT crystal oscillator devices are low-power crystal oscillators that can be used in standard 5 x 7 mm quartz oscillator footprints. The phase noise performance of the IDT crystal oscillators enables their use as reference clocks for phase-noise sensitive applications. The low-power oscillators are ideal for clock generation where low phase-noise reference clocks improve transmission distance or reduce bit error rates and conversion errors of data transmission lines. Additional examples of application uses can be found in wireless infrastructure radio and base-band processing units, high-speed SerDes clocking (for instance S-RIO 1.3 and 2.1), PCI Express® Generation 1, 2 and 3, various Ethernet interfaces (Gigabit Ethernet, XAUI and 10 Gbit Ethernet), optical interfaces in SDH/SONET applications (OC-12, OC- 48 and OC-192) and in driving DAC/ADC devices in instrumentation applications.

Key Selection Criteria for Quartz Oscillator ICs

While physical footprints have tended to standardize, quartz oscillator ICs offer various features and levels of performance. Key attributes include:

  • output type: this is the signalling type of the output that is required of the crystal oscillator circuit. IDT offers HCMOS, LVCMOS, HCSL, LVDS, and LVPECL.
  • output frequency range: the valid range of output frequencies. IDT offers quartz crystal oscillators to address the frequency needs of all popular applications.
  • core voltage: the supply voltage used to power the device. This is typically defined by the power rails available in the system, and often has implications on voltage levels of the output. IDT’s low-power oscillators are offered in 1.8V, 2.5 V and 3.3 V options.
  • phase jitter: defined as the undesired deviation from an ideal periodic timing signal. IDT’s low-power oscillators offer typical RMS phase jitter down to 300 fs integrated over 12 kHz to 20 MHz for high-performance applications.

About Crystal Oscillators and Crystal Oscillator Replacement
A crystal oscillator circuit (or crystal clock oscillator) uses the mechanical resonance of a vibrating crystal or piezoelectric material to create an electrical signal at a precise frequency. This frequency is commonly used to provide a stable clock signal for digital integrated circuits within a system. The most common type of piezoelectric resonator used is the quartz crystal. In general, a crystal oscillator circuit sustains oscillation by accepting a voltage signal from the resonator, amplifying it, and feeding it back to the resonator. When the energy of the generated output frequency matches the losses in the circuit, the oscillation can be sustained. IDT offers thousands of timing products (such as quartz oscillator ICs / clock oscillators) to suit the needs of most applications.

XU and XL Family Overview

IDT XO Corporate Overview

5x7 Clock Overview


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Family NameFunctionOutputs (#)Output TypeOutput Freq Range (MHz)Supply Voltage (V)Phase Jitter Typ RMS (ps)Freq. Stability Total (± PPM)Temp. RangeBudgetary Price @ 1ku (USD)
IDT8N0QV01 Rev H Datasheet8N0QV01 - Block Diagram8N0QV01
Quad-Frequency Programmable ...
FemtoClock NGVCXO1LVCMOS15.476 - 2602.5, 3.30.6463-40 to 85°C, 0 to 70°C
IDT8N3D085 Datasheet8N3D085I - Block Diagram8N3D085I
LVPECL Dual Frequency Progra...
FemtoClock NGXO1LVPECL15.476 - 866.67, 975 - 13002.5, 3.30.24113-40 to 85°C13.42
IDT8N3DV85 Datasheet8N3DV85 - Block Diagram8N3DV85
LVPECL Dual-Frequency Progra...
FemtoClock NGVCXO1LVPECL15.476 - 866.67, 975 - 13003.30.4433, 63, 113-40 to 85°C12.2
IDT8N3QV01 DataSheet8N3QV01 - Block Diagram8N3QV01
Quad-Frequency Programmable ...
FemtoClock NGVCXO1LVPECL15.476 - 866.67, 975 - 13003.30.47563-40 to 85°C
8N3S270 Datasheet8N3S270 - Block Diagram8N3S270
LVPECL Frequency-Programmabl...
FemtoClock NGXO1LVPECL15.476 - 866.67, 975 - 13003.30.232, 0.474, 0.49733, 63-40 to 85°C12.2
8N3S270 Datasheet8N3S270EC-1103 - Block Diagram8N3S270EC-1103
LVPECL Frequency-Programmabl...
FemtoClock NGXO1LVPECL0 - 2403.30.2358-40 to 85°C12.2
IDT8N3S271 Datasheet8N3S271 - Block Diagram8N3S271
LVPECL Frequency-Programmabl...
FemtoClock NGXO1LVPECL15.476 - 866.67, 975 - 13002.5, 3.30.49733-40 to 85°C12.2
IDT8N3S272 Datasheet8N3S272 - Block Diagram8N3S272
LVPECL Frequency-Programmabl...
FemtoClock NGXO1LVPECL15.476 - 866.67, 975 - 13002.5, 3.30.497113-40 to 85°C12.2
8N3SV758N3SV75 - Block Diagram8N3SV75
LVPECL Frequency-Programmabl...
FemtoClock NGVCXO1LVPECL15.476 - 866.67, 975 - 13003.30.4433, 63, 113-40 to 85°C14.03
8N4DV85 Datasheet8N4DV85 - Block Diagram8N4DV85
LVDS Dual-Frequency Programm...
FemtoClock NGVCXO1LVDS15.476 - 866.67, 975 - 13002.50.4663-40 to 85°C14.03
IDT8N4Q001 DataSheet8N4Q001 - Block Diagram8N4Q001
Quad-Frequency Programmable ...
FemtoClock NGXO1LVDS15.476 - 866.67, 975 - 13003.30.2463, 113-40 to 85°C
8N4S270 Datasheet8N4S270 - Block Diagram8N4S270
LVDS Frequency-Programmable ...
FemtoClock NGXO1LVDS15.476 - 866.67, 975 - 13002.5, 3.30.533, 63, 113-40 to 85°C, 0 to 70°C12.2
8N4S271 Final Data Sheet8N4S271 - Block Diagram8N4S271
LVDS Frequency-Programmable ...
FemtoClock NGXO1LVDS15.476 - 866.67, 975 - 13002.5, 3.30.533-40 to 85°C13.42
IDT8N4SV75 Datasheet8N4SV75 - Block Diagram8N4SV75
LVDS Frequency-Programmable ...
FemtoClock NGVCXO1LVDS15.476 - 866.67, 975 - 13002.5, 3.30.4633, 63-40 to 85°C14.03
IDT XO HCMOS Crystal Oscillator Datasheet - XLHXLH PinoutXLH
HCMOS Crystal Oscillator
XLXO1HCMOS, LVCMOS0.75 - 2502.5, 3.30.75, 0.8520, 25, 50, 100-20 to 70°C, -40 to 85°C
IDT XO LVDS Crystal Oscillator Datasheet - XLLXLL PinoutXLL
LVDS Crystal Oscillator
XLXO1LVDS0.75 - 13502.5, 3.30.89, 120, 25, 50, 100-20 to 70°C, -40 to 85°C
IDT XO LVPECL Crystal Oscillator Datasheet - XLPXLP PinoutXLP
LVPECL Crystal Oscillator
XLXO1LVPECL0.75 - 13502.5, 3.30.86, 1.220, 25, 50, 100-20 to 70°C, -40 to 85°C
IDT XO HCMOS Crystal Oscillator Datasheet - XUHXUH PinoutXUH
HCMOS Crystal Oscillator
XUXO1HCMOS, LVCMOS0.016 - 2501.8, 2.5, 3.30.320, 25, 50, 100-40 to 85°C
IDT XO LVDS Crystal Oscillator Datasheet - XULXUL PinoutXUL
LVDS Crystal Oscillator
XUXO1LVDS0.016 - 15001.8, 2.5, 3.30.3, 0.4, 0.820, 25, 50, 100-20 to 70°C, -40 to 85°C
IDT XO LVDS Crystal Oscillator Datasheet - XUMXUM PinoutXUM
LVDS Crystal Oscillator
XUXO1LVDS0.016 - 15002.50.420-20 to 70°C
IDT XO HCSL Crystal Oscillator Datasheet - XUNXUN PinoutXUN
HCSL Crystal Oscillator
XUXO1HCSL0.016 - 15001.8, 2.5, 3.30.3, 0.4, 0.7520, 25, 50, 100-20 to 70°C, -40 to 85°C
IDT XO HCSL Crystal Oscillator Datasheet - XUOXUO PinoutXUO
HCSL Crystal Oscillator
XUXO1HCSL0.016 - 6703.30.325-40 to 85°C
IDT XO LVPECL Crystal Oscillator Datasheet - XUPXUP PinoutXUP
LVPECL Crystal Oscillator
XUXO1LVPECL0.016 - 6701.8, 2.5, 3.30.3, 0.35, 0.7520, 25, 50, 100-20 to 70°C, -40 to 85°C
IDT XO LVPECL Crystal Oscillator Datasheet - XUQXUQ PinoutXUQ
LVPECL Crystal Oscillator
XUXO1LVPECL0.016 - 6703.30.325-40 to 85°C