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FemtoClock® Low-Phase-Noise Frequency Clock Synthesizers

Clock Tree Design
Timing Leader

FemtoClock Low Phase Noise Oscillator and Clock Synthesizer

IDT FemtoClock® and FemtoClock Next Generation (NG) 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 0.5 ps of RMS phase noise, up to 1.3 GHz.

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 IDT 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. Also available are devices with more integrated functions, multiple outputs, multiple frequencies and other more complex programmable synthesis functions.

IDT's FemtoClock timing solutions are ideal reference clocks for almost any jitter-sensitive application. They are designed to work in conjunction with other devices on the board that require a reference clock, such as PHYs, switches, ASICs and network processors. 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. While generally optimized for synthesizing reference clock frequencies commonly used in communication applications, there are also a variety of FemtoClock devices with frequencies useful for CPU, memory, logic and other general-purpose clocking applications, including ASICs, DSPs, CPUs and memory; communication (including SONET/SDH and SPI4.2); HDTV video; networking (including 1 Gb, 10 Gb,XAUI and 12 Gb Ethernet); PCI Express; SERDES and PHY reference clocks; serial storage (SAS, SATA, fibre channel 4, 8 and 10 Gb); and wireless infrastructure (including CPRIRP3).

About Low-jitter Clocks
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. IDT 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.


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Outputs (#)Output TypeOutput Freq Range (MHz)Input Freq (MHz)Inputs (#)Input TypeOutput Banks (#)Core Voltage (V)Output Voltage (V)Phase Jitter Typ RMS (ps)Phase Jitter Max RMS (ps)
ICS840N202I Datasheet840N202I - Block Diagram840N202I
FemtoClock NG Universal Freq...
2LVCMOS, LVTTL1 - 2500.008 - 7103Crystal, LVPECL, LVDS, LVHSTL, HCSL13.3, 2.53.3, 2.50.6160.865
841N254BI Final Data Sheet841N254I - Block Diagram841N254I
FemtoClock® NG Crystal-to-L...
4LVDS, HCSL100, 125, 156.25, 250252Crystal, LVCMOS12.5, 3.32.5, 3.30.27
841N4830I Data Sheet841N4830I - Block Diagram841N4830I
Femtoclock® NG Crystal-To-...
6LVCMOS, LVPECL, HCSL25 - 100252Crystal, LVPECL, LVDS, HCSL43.33.30.34
ICS843N252-45 Datasheet843N252-45 - Block Diagram843N252-45
FemtoClock® NG Crystal-to-3...
2LVCMOS, LVPECL125, 156.25251Crystal23.33.30.33
ICS843N3960I Datasheet843N3960I - Block Diagram843N3960I
FemtoClock® NG Crystal-to-3...
2LVPECL100, 125, 156.25, 212.5252Crystal, LVPECL, LVDS, HCSL13.
ICS843N571I Datasheet843N571I - Block Diagram843N571I
FemtoClock NG® Clock Synthe...
10LVCMOS, LVPECL25, 33.33, 100, 125, 156.25252Crystal, LVCMOS53.33.30.212
ICS844N255I DATASHEET844N255I - Block Diagram844N255I
FemtoClock® NG Crystal-to-L...
6LVDS25, 50, 100, 125, 156.25252Crystal, LVCMOS52.
844S0258-07 Final Data Sheet844S0258-07 - Block Diagram844S0258-07
FemtoClock™ Crystal/LVCMOS...
8LVDS, LVCMOS125251Crystal23.33.30.278
ICS849N202I Datasheet849N202I - Block Diagram849N202I
FemtoClock NG Universal Freq...
2LVPECL, LVDS0.98 - 13000.008 - 7103Crystal, LVPECL, LVDS, HSTL, HCSL13.3, 2.53.3, 2.50.3210.493
8T49N004I Datasheet8T49N004I - Block Diagram8T49N004I
Programmable FemtoClock® NG...
4LVPECL, LVDS15.16 - 125010 - 312.52Crystal, LVPECL, LVDS, HCSL13.3, 2.53.3, 2.50.2120.292
8T49N006I Datasheet8T49N006I - Block Diagram8T49N006I
Programmable FemtoClock® NG...
6LVPECL, LVDS15.16 - 125010 - 312.52Crystal, LVPECL, LVDS, HCSL13.3, 2.53.3, 2.50.2120.292
8T49N008I Datasheet8T49N008I Block Diagram8T49N008I
Programmable FemtoClock® NG...
8LVPECL, LVDS15.16 - 125010 - 312.52Crystal, LVPECL, LVDS, HCSL13.3, 2.53.3, 2.50.2120.292
8t49N012 Datasheet8T49N012I - Block Diagram8T49N012I
FemtoClock® NG Crystal-to-3...
12LVPECL, LVDS, CMOS15.16 - 125010 - 312.52Crystal, LVPECL, LVDS, HCSL33.3, 2.53.3,
8T49N028 Datasheet8T49N028I - Block Diagram8T49N028I
Crystal-to-3.3V, 2.5V Multip...
8LVPECL, LVDS15.16 - 125010 - 312.52Crystal, LVPECL, LVDS, HCSL43.3, 2.53.3, 2.50.2120.292
8T49N105I Data Sheet8T49N105 - Block Diagram8T49N105I
FemtoClock NG Universal Freq...
1LVPECL, LVDS0.98 - 13000.008 - 7102Crystal, HCSL, LVHSTL, LVDS, LVPECL13.3, 2.53.3, 2.50.2850.446
IDT8T49N203I Datasheet8T49N203I Block Diagram8T49N203I
FemtoClock® NG Universal Fr...
2LVPECL, LVDS0.98 - 13000.008 - 7103Crystal, HCSL, HSTL, LVDS, LVPECL13.3, 2.53.3, 2.50.2850.446
8T49N205I Data Sheet8T49N205I - Block Diagram8T49N205I
FemtoClock® NG Universal Fr...
2LVPECL, LVDS0.98 - 13000.008 - 7102Crystal, HCSL, LVHSTL, LVDS, LVPECL13.3, 2.53.3, 2.50.3780.65
8T49N222I Datasheet8T49N222I - Block Diagram8T49N222I
FemtoClock NG Universal Freq...
2LVPECL, LVDS7.7 - 12000.008 - 7103Crystal, HCSL, HSTL, LVDS, LVPECL23.3, 2.53.3,
IDT8T49N366I Datasheet8T49N366I - Block Diagram8T49N366I
FemtoClock NG Triple Univers...
6LVPECL, LVDS0.98 - 13000.008 - 7107LVCMOS, LVTTL, HCSL, LVHSTL, LVDS, LVPECL32.52.50.3330.465
IDT8T49N445I Datasheet8T49N445I - Block Diagram8T49N445I
FemtoClock NG QUAD Universal...
4LVPECL, LVDS0.98 - 13000.008 - 7105LVCMOS, LVTTL, HCSL, LVHSTL, LVDS, LVPECL42.52.50.3330.465
8T49N488I Data Sheet8T49N488I - Block Diagram8T49N488I
FemtoClock NG QUAD Universal...
8LVPECL, LVDS0.98 - 13000.008 - 7109LVCMOS, LVTTL, HCSL, LVHSTL, LVDS, LVPECL42.52.50.3330.465
IDT8T49N524I Datasheet8T49N524I - Block Diagram8T49N524I
Programmable FemtoClock® NG...
8LVPECL, LVDS15.5 - 650, 975 - 13005 - 8001HCSL, LVDS, LVPECL22.5, 3.33.3, 2.50.3230.405
8V41N004I Datasheet8V41N004I - Block Diagram8V41N004I
FemtoClock® NG Crystal-to-H...
5HCSL100, 125, 156.25, 312.5252Crystal, LVCMOS13.33.30.217
8V44N003I Datasheet8V44N003I - Block Diagram8V44N003I
FemtoClock® NG LVDS Clock S...
2LVDS50 - 120020 - 5001HCSL, LVDS, LVPECL, Sine Wave, LVCMOS13.