Renesas FemtoClock™, FemtoClock Next Generation (NG), FemtoClock 2, and FemtoClock 3 devices are advanced, high-performance clock-frequency synthesizers. Employing a simple, low-cost, fundamental-mode quartz crystal as the low-frequency reference these devices synthesize high-quality, low-jitter clock signals with less than 120fs of RMS phase noise, up to 1.3GHz. The RC3 series also offers a jitter attenuation mode where it can take a noisy reference in and still provide 25fs jitter on its outputs.
FemtoClock devices are fully customizable, stand-alone solutions that generate reference frequencies allowing them to replace crystal and SAW oscillators in high-performance applications. This family of devices is often used to replace third overtone and high-frequency fundamental (HFF, inverted mesa) crystal oscillators or expensive surface acoustic wave (SAW) oscillators. They are more reliable, cost less, and are more readily available with shorter lead times.
Unlike fixed frequency oscillators, FemtoClocks are a frequency-synthesis technology (clock synthesizer) capable of multiple clock frequencies and more flexibility in any application. Because FemtoClocks are silicon IC-based clock devices, additional clock tree functions unavailable in a single function fixed-frequency oscillator can be integrated into a single device. The Renesas FemtoClock family delivers a wide range of device packages and capabilities, starting with small 8-pin TSSOP devices that provide one clean, low jitter clock signal, 4mm x 4mm QFNs that provide 4 outputs, 7mm x 7mm QFNs that provide 8 outputs, and 9mm x 9mm QFNs that provide 12 outputs. Also available are devices with more integrated functions, multiple outputs, multiple frequencies, and other more complex programmable synthesis functions.
PAM4 technology is enabling a major leap in data transmission rates in both communications and data center segments. This impacts the performance requirements of the timing source in such systems. The Renesas high-performance family of FemtoClock 3 devices delivers superior jitter performance with low power in a very small form factor, enabling placement of the clock anywhere on the board at the point of use. This greatly simplifies the design by eliminating the additive jitter associated with the extensive clock routing on the board.
Beyond PAM4, Renesas FemtoClock timing solutions are ideal reference clocks for almost any jitter-sensitive application. They are designed to provide a reference clock to PHYs, switches, ASICs, network processors, broadcast audio and video applications, and medical imaging applications. The result is a simplified board design and layout, as well as improved time-to-market. Moreover, the FemtoClock family meets the low-jitter clock specification requirements of many interface standards, such as 10 Gigabit Ethernet, PCI Express®, Fibre Channel, and SONET.
Jitter can be defined as the undesired deviation from an ideal periodic timing signal. Jitter may be observed in characteristics such as the frequency, phase, or amplitude of successive pulses. High levels of jitter can result in significant undesired system behavior in high-performance applications. Renesas offers the industry's leading portfolio of low-jitter clock synthesizers and phase-locked oscillators (PLL oscillators) to meet the needs of virtually any application.
Outputs (#) |
Output Type |
Output Freq Range (MHz) |
Inputs (#) |
Input Type |
Phase Jitter Max RMS (ps) |
Input Freq (MHz) |
Output Banks (#) |
Core Voltage (V) |
Output Voltage (V) |
Output Skew (ps) |
Phase Jitter Typ RMS (ps) |
C-C Jitter Typ P-P (ps) |
C-C Jitter Max P-P (ps) |
Period Jitter Typ P-P (ps) |
Period Jitter Max P-P (ps) |
App Jitter Compliance |
Prog. Clock |
Prog. Interface |
Reference Output |
Spread Spectrum |
Feedback Input |
Chipset Manufacturer |
Chipset Name |
Price (USD) | 1ku |
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Part Number | |||||||||||||||||||||||||
FemtoClock™ 3 Ultra-Low Noise Jitter Attenuator and Multi-Frequency Clock Synthesizer | 8, 12 | HCSL, LVCMOS, LVDS | 0.001 - 1000 | 3 | CML, Crystal, HCSL, LVCMOS, LVDS, LVPECL | 0.05 | 0.001 - 1000 | 8, 12 | 1.8, 3.3 | 1.8 | 40 | 0.025 | 50 | 50 | 112G SerDes Jitter, PCIe Gen 6 | Yes | I2C, OTP, SPI | No | No | 20.42 | |||||
FemtoClock™ 3 Ultra-Low Noise Multi-Frequency Clock Synthesizer | 8, 12 | HCSL, LVCMOS, LVDS | 0.001 - 1000 | 4 | CML, Crystal, HCSL, LVCMOS, LVDS, LVPECL | 0.05 | 0.001 - 1000 | 8, 12 | 1.8, 3.3 | 1.8 | 40 | 0.025 | 50 | 112G SerDes Jitter, PCIe Gen 6 | Yes | I2C, OTP, SPI | No | No | 13.2 | ||||||
FemtoClock™ NG Crystal-To-HCSL Frequency Synthesizer | 6 | HCSL, LVCMOS, LVPECL | 25 - 100 | 2 | Crystal, HCSL, LVDS, LVPECL | 0.34 | 25 | 4 | 3.3 | 3.3 | 50 | PCIe Gen1, PCIe Gen2, PCIe Gen3 | No | Yes | No | No | 7.522 | ||||||||
FemtoClock NG™ Clock Synthesizer | 10 | LVCMOS, LVPECL | 25, 33.33, 100, 125, 156.25 | 2 | Crystal, LVCMOS | 25 | 5 | 3.3 | 3.3 | 40 | 0.212 | No | Yes | No | No | 3.545 | |||||||||
Programmable FemtoClock™ NG LVPECL/LVDS Clock Generator with 4-Outputs | 4 | LVDS, LVPECL | 15.16 - 1250 | 2 | Crystal, HCSL, LVDS, LVPECL | 0.292 | 10 - 312.5 | 1 | 2.5, 3.3 | 2.5, 3.3 | 50 | 0.212 | 0.78 | 13.2 | Yes | I2C | No, Yes | No | No | 11.83 | |||||
Programmable FemtoClock™ NG LVPECL/LVDS Clock Generator with 6-Outputs | 6 | LVDS, LVPECL | 15.16 - 1250 | 2 | Crystal, HCSL, LVDS, LVPECL | 0.292 | 10 - 312.5 | 1 | 2.5, 3.3 | 2.5, 3.3 | 50 | 0.212 | Yes | I2C | No | No | No | 13 | |||||||
Programmable FemtoClock™ NG LVPECL/LVDS Clock Generator with 8-Outputs | 8 | LVDS, LVPECL | 15.16 - 1250 | 2 | Crystal, HCSL, LVDS, LVPECL | 0.292 | 10 - 312.5 | 1 | 2.5, 3.3 | 2.5, 3.3 | 50 | 0.212 | 0.78 | 8.3 | Yes | I2C | No | No | No | 14.19 | |||||
FemtoClock™ NG Crystal-to-3.3V, 2.5V LVPECL/LVCMOS Clock Generator with Fanout Buffer | 12 | CMOS, LVPECL | 15.16 - 1250 | 2 | Crystal, HCSL, LVDS, LVPECL | 0.26 | 10 - 312.5 | 3 | 2.5, 3.3 | 2.5, 3.3 | 50 | 0.19 | Yes | No | No | No | 21.97 | ||||||||
Crystal-to-3.3V, 2.5V Multiple Frequency Clock Generator with Fanout Buffer | 8 | LVDS, LVPECL | 15.16 - 1250 | 2 | Crystal, HCSL, LVDS, LVPECL | 0.292 | 10 - 312.5 | 4 | 2.5, 3.3 | 2.5, 3.3 | 50 | 0.212 | 0.78 | 8.3 | Yes | I2C | Yes | No | No | ||||||
FemtoClock NG Triple Universal Frequency Translator | 6 | LVDS, LVPECL | 0.98 - 1300 | 7 | HCSL, LVCMOS, LVDS, LVHSTL, LVPECL, LVTTL | 0.465 | 0.008 - 710 | 3 | 2.5 | 2.5 | 0.333 | 40 | Yes | I2C | No | Yes | Yes | 67.04 | |||||||
FemtoClock™ NG 12-Output Clock Generator | 12 | HCSL | 10.91 - 2500 | 2 | Crystal, HCSL, HSTL, LVCMOS, LVDS, LVHSTL, LVPECL | 5 - 1000 | 4 | 3.3 | 3.3 | 50 | 0.095 | 40 | Yes | I2C | No | No | No | ||||||||
FemtoClock™ NG LVDS Clock Synthesizer | 2 | LVDS | 50 - 1200 | 1 | HCSL, LVCMOS, LVDS, LVPECL, Sine Wave | 0.45 | 20 - 500 | 1 | 3.3 | 3.3 | 0.3 | Yes | I2C | Yes | No | No | |||||||||
FemtoClock™ NG 12-Output Clock Generator | 12 | LVDS, LVPECL | 10.91 - 2500 | 2 | Crystal, HCSL, HSTL, LVCMOS, LVDS, LVHSTL, LVPECL | 5 - 1000 | 4 | 3.3 | 3.3 | 30 | 0.089 | 40 | Yes | I2C | No | No | No | 14.63 | |||||||
FemtoClock™ NG 12-Output Clock Generator | 12 | LVDS, LVPECL | 10.91 - 2500 | 2 | Crystal, HCSL, HSTL, LVCMOS, LVDS, LVHSTL, LVPECL | 5 - 1000 | 4 | 3.3 | 3.3 | 50 | 0.08 | 40 | Yes | I2C | No | No | No | ||||||||
FemtoClock Clock Generator | |||||||||||||||||||||||||
FemtoClock™ 2 Clock Generator | 4 | HCSL, LVCMOS, LVDS | 10 - 1000 | 2 | Crystal, HCSL, LVCMOS, LVDS | 0.1 | 25 - 312.5 | 4 | 1.8, 3.3 | 1.8 | 50 | 0.079 | Yes | I2C, SPI | No | No | No | 9.134 | |||||||
FemtoClock™ 2 Clock Generator | 4 | HCSL, LVCMOS, LVDS | 10 - 1000 | 0 | 0.1 | 4 | 1.8, 3.3 | 1.8 | 50 | 0.079 | Yes | I2C, SPI | No | No | No | 9.069 | |||||||||
FemtoClock™ 2 Jitter Attenuator or Clock Generator | 4 | HCSL, LVCMOS, LVDS | 10 - 1000 | 3 | CML, Crystal, HCSL, LVCMOS, LVDS, LVPECL | 0.1 | 1 - 800 | 4 | 1.8, 3.3 | 1.8 | 40 | 0.079 | 112G SerDes Jitter, PCIe Gen 6 | Yes | I2C, OTP, SPI | No | No | No | 9.497 | ||||||
FemtoClock 2 Jitter Attenuator or Clock Generator | 8 | HCSL, LVCMOS, LVDS | 10 - 1000 | 3 | CML, Crystal, HCSL, LVCMOS, LVDS, LVPECL | 0.1 | 1 - 800 | 8 | 1.8, 3.3 | 1.8 | 40 | 0.067 | 112G SerDes Jitter, PCIe Gen 6 | I2C, OTP, SPI | No | No | |||||||||
FemtoClock™ 2 Jitter Attenuator or Clock Generator | 4 | HCSL, LVCMOS, LVDS | 10 - 1000 | 3 | CML, Crystal, HCSL, LVCMOS, LVDS, LVPECL | 0.1 | 1 - 800 | 4 | 1.8, 3.3 | 1.8 | 40 | 0.079 | 112G SerDes Jitter, PCIe Gen 6 | Yes | I2C, OTP, SPI | No | No | No |
Introducing the industry's lowest jitter 25fs RMS clock generator and jitter attenuator.