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製品 (137)
SI5345A-D04594-GMR - 10-Output Jitter Attenuator | Skyworks
The Skyworks Solutions (formerly Silicon Labs) SI5345A-D04594-GMR is a factory-programmed 10-output, any-frequency (< 1028 MHz) jitter attenuator clock IC housed in a 64-pin QFN-EP (9x9 mm) package with exposed thermal pad. The Si5345 family uses a fourth-generation MultiSynth divider technology and a low-jitter VCO to deliver industry-leading phase noise and sub-200 fs RMS jitter while supporting frequencies up to 1028 MHz on each of its ten differential or single-ended outputs. A clock synthesizer (sometimes called a clock generator or frequency synthesizer) is an IC that derives one or more precise output frequencies from a single reference source. Within the broader hierarchy, the SI5345A belongs to the clock timing IC family, which sits under integrated circuits and plays a critical role in synchronous digital systems: SOC > integrated circuit > clock & timing IC > clock generator > frequency synthesizer > jitter attenuator. Jitter attenuators add a low-bandwidth PLL on top of a synthesizer to filter reference-clock noise before redistribution to downstream PHYs, ADCs, DACs, and FPGAs. Key features of this variant include ten independently configurable output formats (LVDS, LVPECL, HCSL, CML, CMOS, HSTL, SSTL), an I2C control interface, 1.71 V to 1.89 V core supply range, and a -40 C to +85 C industrial operating range. The -D04594-GM code denotes a custom factory-programmed frequency plan generated by Skyworks ClockBuilder Pro, which removes the burden of in-system NVM programming. Architecturally, the Si5345A uses a fractional-N MultiSynth divider per output, allowing non-integer frequency translations without compromising phase noise. The internal low-jitter VCO and digitally programmable loop bandwidth enable optimization for each application's jitter transfer characteristics. This makes the SI5345A well suited to reference clock generation for 100G/400G Ethernet PHYs, OTN/SONET/SDH line cards, FPGA transceiver reference chains, wireless base-station timing, and high-end broadcast video. Typical applications include 100G/400G Ethernet switches, OTN/SONET/SDH line cards, FPGA/ASIC reference clock trees, wireless base-station timing boards, and broadcast video routers. The wide output format support and low jitter make it a flexible single-chip timing solution for mixed-signal boards that would otherwise require multiple oscillators or clock generators. When designing with the SI5345A, place the 0.1 uF + 10 uF decoupling network as close as possible to each supply pin and expose the e-pad with at least 25 thermal vias to an internal ground pour. Use the ClockBuilder Pro configuration file attached to your -D04594 order code to load the pre-configured frequency plan into the IC; do not re-program the NVM unless intentionally overriding the factory image. This page synthesizes verified distributor pricing, drop-in compatible alternatives, and practical PCB layout notes that are not aggregated on the manufacturer datasheet alone.
SI5345A-D06546-GM - 10-Output Any-Freq Jitter Attenuator | Silicon Labs
The Silicon Labs (Skyworks) SI5345A-D06546-GM is a low-jitter, 10-output, any-frequency (<1028 MHz) clock multiplier and jitter attenuator housed in a 64-pin QFN (10x10 mm) package with exposed pad. This device delivers any combination of output frequencies up to 1.028 GHz on each of its 10 differential or single-ended outputs, all synthesized from a single reference input. What is a clock multiplier/jitter attenuator? A clock multiplier is a timing-IC block that synthesizes one or more higher-frequency output clocks from a lower-frequency reference. A jitter attenuator is a PLL (phase-locked loop) that uses a narrow loop bandwidth to filter reference-clock phase noise before re-synthesizing a clean output. Together, these functions provide a low-noise, deterministic timing source for systems where the upstream reference is noisy (recovered clocks, CPLD/FPGA SERDES, PHY clocks). The SI5345A belongs to the clock generator family hierarchy: clock IC -> clock generator/jitter cleaner -> PLL-based clock multiplier -> timing IC -> analog mixed-signal IC -> semiconductor IC. Key features include a digitally programmable jitter-attenuation bandwidth for application-level optimization, sub-200 fs typical RMS jitter (12 kHz-20 MHz), integrated fractional-N PLLs with multi-mode DSPLL architecture, and I2C/SPI host control via ClockBuilder Pro software. Outputs support LVPECL, LVDS, HCSL, CML, CMOS, and SSTL signaling, eliminating the need for discrete level translators when interfacing with FPGAs, ASICs, and PHYs. Architecturally, the SI5345A uses Silicon Labs' MultiSynth technology that pairs one high-frequency DSPLL with multiple fractional dividers, allowing any output to take any frequency from 1 Hz to 1.028 MHz independently. The on-chip voltage regulators accept a single 1.8V/3.3V supply rail and generate all internal voltages, simplifying PCB power design. Typical applications include carrier-grade networking (SyncE, IEEE 1588), data-center switches/routers, OTN/optical line cards, broadcast video reference timing, GPON/PON OLT, broadband DSLAM, and 100G/200G/400G Ethernet PHY clocking. The 10 independent outputs let one device replace multiple crystals and PLLs in a typical timing tree. Design tip: route the reference input (XA/XB) and the high-frequency serial host signals (I2C/SPI/GPIO) with controlled-impedance traces and shielded ground pours to preserve the low-jitter performance; place the on-chip regulator bypass capacitors within 50 mils of the supply pins. Wideband scope probes on jitter-cleaned outputs verify compliance with the relevant jitter mask (e.g., G.8262, PCIE Gen4). This page synthesizes distributor pricing, drop-in Si5345/Si5344/Si5342 family alternatives, and practical design notes not found in any single manufacturer datasheet or distributor listing. PARAGRAPH_PLACEHOLDER_TEMP_DELETE
SI5345A-D10713-GM - 10-Output Jitter Attenuator | Skyworks
The Skyworks SI5345A-D10713-GM is a low-jitter, 10-output, any-frequency (< 1028 MHz) any-output jitter attenuator clock multiplier housed in a 64-pin VFQFN exposed-pad package. It is a factory-customized variant of the Si5345A platform, where the '-D10713-GM' suffix designates a specific pre-programmed register setting configured through ClockBuilder Pro for the customer's target frequency plan. The device integrates a fourth-generation DSPLL with MultiSynth technology to deliver sub-100 fs typical RMS jitter (12 kHz-20 MHz) and four independent DSPLL lanes that can each synthesize non-integer-related fractional output frequencies. An any-frequency jitter attenuator belongs to the clock-tree-on-a-chip product family - a class of timing IC that consolidates multiple frequency synthesis, jitter cleaning, and level translation functions into a single silicon device. Within the broader taxonomy, it sits as clock synthesizer / jitter cleaner > clock generator > timing IC > semiconductor. These parts are the modern successors to legacy XO + PLL designs and are critical wherever a system clock must be regenerated with extremely low phase noise for high-speed serial links, RF data converters, and FPGA/ASIC reference inputs. Key features include 10 differential or single-ended clock outputs, per-output frequency synthesizers from 1 Hz up to 1028 MHz, an on-chip EEPROM for storing the factory frequency plan, an I2C/SPI control interface, and a digitally programmable jitter-attenuation bandwidth. The Si5345A serves four independent DSPLL lanes from up to two input references, enabling hitless reference switching and holdover when the primary reference is lost. The 64-VFQFN exposed pad (Ravenna-grade thermal pad) supports reflow soldering to a 9 mm x 9 mm PCB land pattern with a thermal resistance consistent with industrial 85 C operation. Architecturally, the device combines a low-noise fractional-N PLL core, MultiSynth fractional output dividers, and per-output driver strength/slew programming. Skyworks' DSPLL technology allows the loop bandwidth to be tuned from 0.1 Hz to 4 kHz depending on the application's tolerance for input jitter versus wander, letting the designer trade off between tracking and cleaning. This level of programmability - combined with the factory customization suffix - means each '-Dxxxxx-GM' part number represents a complete clock-tree solution that drops into the same PCB footprint as a generic Si5345A blank. Typical applications include 100G/400G Ethernet line-card reference clocks, OTU/SONET/SDH equipment timing, OTN and PTP grandmaster clocks, broadband wireless infrastructure such as 5G base stations, broadcast video and professional audio systems, and FPGA/ASIC SerDes reference generation. The wide output frequency range up to 1028 MHz covers virtually every common data converter, processor, and transceiver reference in a system. When laying out the SI5345A-D10713-GM, use a 4-layer PCB with a continuous ground island under the exposed pad; an unbroken thermal pad with multiple stitched vias is required for specified 1 ps period jitter. Decouple each VDD pin with a 0.1 uF X7R placed within 2 mm of the pin, and route each output trace as a 50 ohm (single-ended) or 100 ohm differential transmission line with no stubs. Always configure the device with the ClockBuilder Pro project file matching the ordered part suffix - using a generic Si5345A blank configuration will produce incorrect output frequencies.
SI5345B-D-GM - 10-Output Jitter Attenuator | Skyworks
The Skyworks Solutions (formerly Silicon Labs) SI5345B-D-GM is a 10-channel, any-frequency, any-output jitter attenuator and clock multiplier housed in a 64-pin QFN exposed-pad package. It integrates fourth-generation DSPLL and MultiSynth technologies to synthesize up to ten independent output frequencies from a single reference, with output rates up to 350 MHz and 0.09 ps RMS phase jitter typical performance. The device operates from a 1.8 V / 3.3 V supply and is configurable via I2C/SPI with on-chip non-volatile memory. A jitter attenuator is a clock-tree building block that takes a potentially noisy reference signal and produces an ultra-clean clock that meets strict phase-noise and jitter budgets. Within the broader timing hierarchy it sits above simple crystal oscillators (XO) and below fully integrated timing cards; the SI5345B family specifically targets applications where any-frequency flexibility and sub-100-fs-class jitter are required simultaneously, such as 10G/25G/100G Ethernet PHYs, OTN framer/mapper ASICs, and synchronous-Ethernet line cards. Key features include any-output frequency from 0.001 MHz to 350 MHz, programmable output formats (LVCMOS, LVDS, LVPECL, HCSL, CML), digitally programmable jitter-attenuation bandwidth, and a fractional-feedback architecture that delivers true any-frequency synthesis without requiring external VCXO components. Each of the ten outputs can be set to different logic levels, divider ratios, and enable states through the serial interface, replacing multiple single-purpose oscillators and buffers on dense telecom boards. The architecture combines a fourth-generation DSPLL core with ten independent MultiSynth fractional dividers, allowing each output to be tuned to non-integer ratios from a common reference without compromising phase noise. Internal loop-filter components, EEPROM-backed default configuration, and per-output skew adjustment further simplify board design while keeping the BOM small. Typical applications include IEEE 1588 packet-clock synchronization, OTU2/OTU4 framer line cards, 100G optical module reference clocks, broadcast video reference generation, and FPGA transceiver reference clocking. The Skyworks ClockBuilder Pro software lets designers generate a register map for any combination of input/output frequencies and load it into the on-chip NVM so the device powers up configured. When laying out the Si5345B, treat the exposed pad as the primary thermal and grounds return path, place both 1.8 V and 3.3 V decoupling within 2 mm of their respective pins, and keep output traces at matched lengths (within 25 mil) for LVDS/LVPECL pairs to preserve jitter performance at high toggle rates. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet alone.
SI5351A-B-GTR - 200MHz I2C CMOS Clock Generator, 2-Output, MSOP-10 | Skyworks
The Skyworks (formerly Silicon Labs) SI5351A-B-GTR is an I2C-programmable any-frequency CMOS clock generator that synthesizes up to two independent non-integer-related frequencies from 8 kHz to 160 MHz, with a maximum output frequency of 200 MHz on each of its two LVCMOS outputs, housed in a 10-pin MSOP package. The device integrates two MultiSynth fractional dividers driven by a high-frequency PLL and accepts a standard 25 MHz or 27 MHz crystal reference, enabling flexible frequency planning without external VCXO components. A clock generator is a semiconductor IC that produces one or more precise timing signals used to synchronize logic in digital systems. The SI5351A-B-GTR belongs to the broader category of timing ICs, which sits between frequency synthesizers (PLL/VCO blocks) and standard fixed-frequency oscillators. Within the timing hierarchy, it is classified as a programmable CMOS clock generator, offering finer frequency resolution than a fixed-frequency XO and lower cost and complexity than a full VCXO/PLL solution. Engineers reach for the Si5351 family when fixed oscillators cannot deliver the exact multiple frequencies a system requires, especially in mixed-signal designs, SDR front-ends, and embedded video/multi-rate audio applications. Key features include independent per-output MultiSynth fractional-N dividers, user-configurable drive strength (2 mA, 4 mA, 6 mA, 8 mA), a spread-spectrum option for EMI reduction, and ultra-low jitter measured at 70 ps pk-pk typical. The two LVCMOS outputs support independently selectable output enable and phase-offset adjustment, allowing fine skew control between clock domains. The device operates from a single 2.5 V or 3.3 V supply with low quiescent current draw and integrates an I2C interface (up to 400 kHz) for in-system register configuration. The architecture is built around two PLLs and per-output MultiSynth fractional dividers that decouple output frequencies from integer-multiple relationships, enabling any-rate-any-output synthesis. The internal VCO is calibrated automatically, eliminating manual loop-filter components and supporting the wide 8 kHz to 200 MHz output range from a single silicon revision. Typical applications include amateur-radio SDR QRP transceivers, FPGA reference clocks, multi-rate audio interface clocks (e.g., 44.1/48/96 kHz families), microcontroller clock-tree generation, and HDMI/USB peripheral timing. When designing with this device, ensure the reference crystal load capacitance matches the onboard load capacitors, and follow the ClockBuilder Pro configuration utility to generate the I2C register map for non-standard frequency plans.
SI5391A-A-GM - 12-Output Ultra-Low-Jitter Clock Generator | Skyworks
The Skyworks Solutions SI5391A-A-GM is a 12-output, any-frequency, any-output ultra-low-jitter clock generator housed in a 64-pin VFQFN exposed-pad package. It supports a maximum output frequency of 1028 MHz, achieves phase jitter as low as 0.075 ps RMS, and operates from a single 1.8 V core supply with 3.3 V tolerant I/O. The device combines MultiSynth fractional and integer synthesis blocks to deliver four reference inputs, an on-chip VCO, and in-system programmable non-volatile memory for power-up deterministic configuration. A clock generator is a timing IC that derives one or more synchronized output frequencies from a single reference and distributes them as low-jitter CMOS, HCSL, LVDS, or LVPECL clocks to system sub-blocks. Clock generators sit in the broader timing hierarchy: oscillator -> PLL -> clock synthesizer -> clock generator -> clock buffer/jitter cleaner. The SI5391A-A-GM occupies the high-performance end of the clock-generator taxonomy, merging low-jitter PLL jitter-cleaning with MultiSynth fractional synthesis - it functions simultaneously as a synthesizer and a jitter-cleaner. Key specifications include 95 fs RMS typical phase jitter (12 kHz-20 MHz), 1.5 ps peak-to-peak period jitter, four differential reference inputs (XTAL, CMOS, LVDS, HCSL, LVPECL), twelve configurable output drivers, integrated LDO regulators, and I2C/SPI host control. Loss-of-lock and loss-of-reference detection support broadcast video, OTN, and SONET/SDH holdover transitions. The architecture pairs a high-Q analog MultiSynth VCO with four fractional-output MultiSynth blocks, allowing independent, non-coupled output frequencies up to 1028 MHz. Each output driver independently supports CMOS, HCSL, LVDS, and LVPECL standards through register configuration, eliminating external level-translation components. Typical applications include 100G/400G optical-module line-card clock trees, broadcast video reference clock fan-out, wireless baseband timing, OTN/SONET/SDH line cards, FPGA and ASIC reference-clock distribution in test & measurement ATE, and server/storage PCIe Gen 5 reference-clock generation. When designing with the SI5391A-A-GM, use Skyworks ClockBuilder Pro to generate the personalized configuration script because each shipping variant is factory pre-programmed with a unique NVM image. Plan PCB layout to keep the 64-VFQFN exposed pad soldered to a continuous low-thermal-resistance ground plane. This page synthesizes authoritative datasheet specs, current distributor pricing as of 2026-10-10, drop-in same-package alternatives, and AEO-oriented engineering content not found in the Si5391 datasheet alone.
SI5391P-A-GM - Ultra-Low Jitter 12-Output Clock Generator
The Skyworks Solutions (formerly Silicon Labs) SI5391P-A-GM is a precision-calibration ultra-low-jitter clock generator IC delivering 12 outputs from a single 64-pin VQFN exposed-pad package. According to the manufacturer's datasheet, it supports a maximum output frequency of 312.5 MHz and provides RMS phase jitter of 69 fs (typical) at 156.25 MHz and 312.5 MHz carrier frequencies, calibrated for data-converter, networking, and wireless infrastructure applications. A clock generator is a frequency-synthesis component that produces one or more precisely controlled timing references from a single input reference. Clock generators occupy the timing hierarchy above quartz crystals (which provide only a single fixed frequency) and below PLLs that lock to external references. The SI5391P belongs to the broader family of programmable clock generators that internalize MultiSynth fractional-divider technology to generate "any-frequency, any-output" combinations, eliminating discrete oscillator inventory in complex multi-rail designs. Key features of the SI5391P-A-GM include a 48 MHz crystal reference input, support for three independent clock domains, I2C/SPI serial configuration with non-volatile memory for default configuration restore, and precision calibration that linearizes the internal MultiSynth to achieve 95 fs maximum phase jitter across the supported frequency plan. Each output can be independently set to LVPECL, LVDS, HCSL, CMOS, or SSTL levels through software, allowing one part to replace multiple discrete XOs in PCB layout. Architecturally, the device combines a low-noise PLL, four MultiSynth fractional dividers, and per-output level translators. The MultiSynth architecture achieves 0 ppm frequency synthesis error while maintaining sub-100 fs RMS jitter, which directly translates to bit-error-rate improvements in 100G/400G optical transceivers and to ENOB headroom in high-speed ADCs. The 1 GHz internal VCO is divided down through MultiSynth blocks rather than traditional sigma-delta modulators, avoiding spurs in sensitive spectrum windows. Typical applications include 100G/400G Ethernet PHY line cards, OTU4 long-haul optical module reference clocks, FPGA and ASIC fabric clocks, JESD204B/C SerDes reference generation for high-speed data converters, wireless base-station timing distribution, and broadcast video reference generation. Its low intrinsic jitter makes it suitable as a master clock for RF DACs and ADCs where aperture jitter limits signal-to-noise ratio at IF frequencies above 1 GHz. When designing with the SI5391P, ensure the AC-coupling capacitor network on each differential output matches the 100-ohm termination scheme and that the PCB layout keeps the 48 MHz crystal traces short and symmetric. Decoupling the AVDD pins with both bulk and high-frequency ceramic capacitors within 2 mm of the exposed pad is critical to achieving datasheet jitter specifications.
SI5394A-A-GM - 4-Output Jitter Attenuator, 69fs | Skyworks
The Skyworks (formerly Silicon Labs) SI5394A-A-GM is a 4-output ultra-high-performance jitter attenuator that combines fourth-generation DSPLL and MultiSynth technologies to deliver 69 fs of phase jitter, supporting any-frequency clock generation and reference-clean clocking for next-generation serial-data systems. Housed in a 44-pin VFQFN Exposed Pad package, the device provides up to 12.8 GHz maximum output frequency per the DigiKey listing and includes 1 PLL with internal reference support. A jitter attenuator is a clock-tree building block placed between a noisy reference oscillator (or recovered clock) and a downstream high-speed transceiver, ADC, or serializer/deserializer (SerDes). The Si5394 integrates a digital PLL (DSPLL) with a MultiSynth fractional output divider tree, allowing it to generate non-integer-related output frequencies from almost any input reference while aggressively attenuating jitter across a wide loop bandwidth. As a member of the clock & timing hierarchy, it sits above simple crystal oscillators and below the system-level timebase, providing a programmable timing layer. The headline performance numbers are 69 fs RMS phase jitter (12 kHz-20 MHz integration band), 12.8 GHz maximum output frequency, and 12-channel/4-output flexibility. The device also supports free-run, synchronous, and holdover operating modes plus enhanced hitless switching between input references, minimizing phase transients during reference changes. Programming is done through a serial interface with in-circuit programmable non-volatile memory (NVM) so the device always powers up with a known frequency plan. The Si5394A-A-GM is targeted at 56G PAM4 SerDes, OTN/optical transport, high-speed data-conversion reference clocks, broadcast video, and military/aerospace timing systems. The combination of sub-100 fs jitter and high output frequency makes it one of the highest-performance integrated jitter cleaners on the market. When designing with this part, engineers should follow the ClockBuilder Pro configuration tool from Skyworks/Silicon Labs and respect the PCB layout note that all supply pins require local decoupling, while the exposed pad must be soldered to a continuous ground plane for thermal and electrical integrity. This page synthesizes distributor pricing, same-package cross-references, and practical design notes not found in the manufacturer datasheet.
SIT1602BC-22-33S-38.000000 - 38 MHz MEMS LVCMOS XO | SiTime
The SiTime SIT1602BC-22-33S-38.000000 is a 38.000 MHz fixed-frequency MEMS-based XO (crystal oscillator) with HCMOS/LVCMOS output, supplied in a 4-pin 3.2x2.5 mm SMD no-lead package. It operates from a continuous 1.8 V to 3.3 V supply (3.3 V nominal in this variant) and integrates Standby (Power Down) functionality for battery-powered applications. Per the SiTime SiT1602 datasheet, the device consumes 4.5 mA typical active current and supports frequencies from 3.57 MHz to 77.76 MHz, of which 38 MHz is one of 52 standard frequencies offered. An XO (crystal oscillator) is a self-contained timing device that delivers a stable square-wave reference clock to digital logic, MCUs, FPGAs, SoCs, and serializer/deserializer (SerDes) channels. In the broader taxonomy, an XO sits below the TCXO/VCTCXO/OCXO classes and above a bare quartz crystal: a quartz crystal alone cannot drive a load, whereas an XO combines the resonator with an amplifier and output buffer in one package. MEMS oscillators such as the SiT1602 family replace legacy quartz with silicon micro-electromechanical resonators, improving shock/vibration tolerance and shortening lead times. Key features of the SIT1602BC-22-33S-38.000000 include ±25 ppm frequency stability over -20 °C to +70 °C, total stability as low as ±20 ppm across the wider -40 °C to +85 °C operating range, 100% pin-to-pin compatibility with quartz-based XO footprints, and a standby current that preserves battery life. The 38 MHz output is a commonly required reference for Ethernet PHYs, USB 2.0 controllers, and mid-speed MCU peripherals. The SiT1602B architecture pairs a silicon MEMS resonator with a programmable analog ASIC and LVCMOS driver, achieving faster start-up than typical quartz oscillators while eliminating the quartz crystal's susceptibility to shock. Its 4.5 mA active supply current makes it suitable for always-on or battery-backed designs. Typical applications include Ethernet PHY reference clocks, USB 2.0 full-speed clocks, MCU/MPU clock trees, portable industrial handheld terminals, and consumer audio/video peripherals. The wide 1.8-3.3 V continuous supply range also allows a single BOM configuration across multiple rails, simplifying inventory. When designing in the SIT1602BC-22-33S-38.000000, place a 0.1 µF decoupling capacitor within 2 mm of the VDD pin and keep the output trace short to minimise reflections on this fast-edged LVCMOS signal. For standby control, drive the ST pin logic-low to enter power-down. This page synthesizes distributor stock, drop-in SiT1602 alternatives, and practical design notes beyond the manufacturer datasheet for engineers evaluating the 38 MHz fixed-frequency MEMS XO option.
SIT9002AI-432N33EQ200.00000Z - 200 MHz HCSL Spread-Spectrum XO | 6-SMD
The SiTime SIT9002AI-432N33EQ200.00000Z is a programmable spread-spectrum differential oscillator from the SIT9002 family, factory-configured at 200 MHz with HCSL output, 3.3 V supply, ±50 ppm frequency stability, and a 5.0 x 3.2 mm 6-SMD package. According to the SiTime datasheet, the SIT9002 platform is the industry's first programmable spread-spectrum differential oscillator and supports four programmable differential output signaling types: LVPECL, LVDS, CML, and HCSL across a 1 MHz to 220 MHz frequency range. This specific part-number suffix decodes as: AI = industrial grade, 43 = 5.0 x 3.2 mm 6-SMD, 2 = HCSL output, N33 = 3.3 V supply, E = Enable/Disable pin, Q = ±50 ppm stability, 200.00000 MHz center frequency, Z = factory-programmed customer configuration. Spread-spectrum clocking is a technique used to reduce peak electromagnetic interference (EMI) by modulating the output frequency over a wide band, lowering the fundamental tone-of-frequency amplitude measured in dBµV/m. The SIT9002 supports both center-spread and down-spread modes with programmable spread percentages, allowing system designers to meet stringent EMI compliance targets without adding shielding or filtering. As a programmable SiTime part, this device is built on a silicon MEMS resonator rather than a quartz crystal, providing superior shock and vibration resistance and eliminating the start-up reliability issues common to traditional crystal oscillators. Key electrical features of the SIT9002 family include: ±50 ppm total frequency stability across the full industrial temperature range (-40 °C to +85 °C), low jitter differential outputs suitable for PCI Express Gen-1 reference applications, and integrated Enable/Disable pin (pin 1) for power management. The HCSL output format is reference-terminated at the receiver and is commonly used for chip-to-chip clocking on PCI Express, Serial ATA, and RapidIO interfaces. Unlike LVPECL which requires external biasing, HCSL simplifies board design by allowing a source-terminated series resistor at the driver output. Typical applications include PCI Express expansion cards and chipsets, server and storage area networking clock distribution, industrial controllers with EMI-sensitive enclosures, and SATA/SAS storage interfaces. The wide programmable frequency range (1 to 220 MHz) and four programmable pin shapes (LVPECL/LVDS/CML/HCSL) make the SIT9002 family a flexible platform for designers who want a single BOM line that covers multiple frequency plans and output standards. When designing with this part, ensure the load capacitors specified in the datasheet are placed close to the receiver, and that the HCSL source-termination resistor (typically 33 Ω) is selected per the SiTime reference schematic. For best EMI performance, use the down-spread mode with at least ±0.25 % spread percentage, which typically reduces measured EMI by 7-10 dB on the fundamental. This page synthesizes distributor pricing, drop-in alternative MPNs, and application-specific design notes not found in the manufacturer datasheet itself.
SKY72300-362 - 2.1 GHz Dual Fractional-N Synthesizer | Skyworks
The Skyworks SKY72300-362 is a direct digital modulation fractional-N frequency synthesizer that provides ultra-fine frequency resolution, fast switching speed, and low phase-noise performance. It supports an RF output range from 100 MHz to 2.1 GHz with a 100 Hz step size in a 24-pin VFQFN exposed-pad package. The part operates from a single 2.7 V to 3.3 V supply while drawing only 200 µA typical current, suiting it to portable and battery-powered radio platforms. A fractional-N synthesizer is a phase-locked loop (PLL) frequency synthesizer that allows the feedback divider to take non-integer values, achieving a reference-frequency resolution smaller than the comparison frequency itself. The SKY72300-362 belongs to the broader category of clock & timing ICs and sits within the hierarchy: PLL -> frequency synthesizer -> clock generator -> timing IC -> mixed-signal semiconductor. This taxonomy matters because fractional-N synthesizers are preferred over integer-N designs whenever fine channel spacing is required without sacrificing loop bandwidth or switching speed. Key differentiating specifications include programmable divide ratios from 38 to 537 in fractional-N mode and from 32 to 543 in integer-N mode, dual CML prescaler outputs for flexible system architecture, and integrated charge-pump phase detectors that remove the need for an external loop-filter op-amp. The device also features a low phase-noise floor of -91 dBc/Hz, which is essential for high-performance radio designs requiring clean local-oscillator signals. Architecture-wise the SKY72300-362 combines a digital Σ-Δ modulator with a high-speed prescaler and dual charge pumps. Direct digital modulation enables data to be injected into the loop without an external DAC, which simplifies the radio baseband interface and minimizes bill-of-material cost. The spur-free architecture specifically targets spurious emissions that commonly degrade adjacent-channel performance in fractional-N synthesizers. Typical applications include cellular base-station transceivers, wireless local-loop equipment, ISM-band radios operating between 750 MHz and 850 MHz, and Software Defined Radio (SDR) platforms. The 750-850 MHz VCO/synthesizer combination is well-suited to industrial-scientific-medical bands, private mobile radio, and short-range data links. The part's small 4x4 mm QFN footprint also enables compact PCB layouts for portable test equipment. When designing with this part, place the loop filter components as close to the charge-pump pins as possible, use a stable low-noise reference oscillator, and ensure the exposed pad receives sufficient ground copper for thermal dissipation. Bypass capacitors of 100 nF and 10 µF in parallel should be placed within 2 mm of the supply pin. This page synthesizes distributor pricing, drop-in alternative candidates, and practical RF design notes not collated in the manufacturer datasheet alone.
SN65LVDS105PWR - 1:4 LVDS Clock Fanout Buffer 400Mbps | TI
The Texas Instruments SN65LVDS105PWR is a 1 LVTTL-to-4 LVDS clock fanout buffer and repeater that accepts a single low-voltage TTL input and drives four differential LVDS output pairs at data signaling rates up to 400 Mbps (clock frequencies to 400 MHz), operating from a single 3.3-V supply (3 V to 3.6 V) in a 16-pin TSSOP (PW) package. A clock fanout buffer is a timing distribution device that takes one reference clock or data stream and replicates it across multiple identical outputs, maintaining signal integrity over transmission lines. Within the system hierarchy, it belongs to the clock buffer and signal repeater family of interface ICs, sitting between the clock source and the differential receivers distributed across a backplane or board. LVDS, as specified in ANSI EIA/TIA-644, is a low-voltage differential signaling technique offering low power, low noise coupling, and high switching speeds over relatively long distances. Key features include four differential LVDS line drivers meeting or exceeding the ANSI EIA/TIA-644 LVDS standard, a typical output voltage swing of 350 mV into a 100-ohm load, operation from a single 3.3-V rail, and support for signaling rates to 400 Mbps. The LVTTL-compatible input allows direct connection to standard CMOS or TTL clock sources without external level translation. Technically, the SN65LVDS105 integrates one LVTTL receiver stage followed by four parallel LVDS drivers implemented with current-mode outputs, which limit the slew-related EMI and crosstalk compared with single-ended signaling. The small 350-mV differential swing over a 100-ohm terminated line reduces power consumption relative to PECL while sustaining high data rates, making the part well suited to dense timing trees. Typical applications include clock distribution to backplane line cards, LVDS signal retiming and repeat in telecom and networking equipment, and fanout of a processor or FPGA reference clock to multiple serializer or ADC loads. Design consideration: route each LVDS output pair as a controlled-impedance 100-ohm differential pair, and keep the LVTTL input trace away from the LVDS pairs; on multilayer boards TI recommends at least two separate signal planes to reduce TTL/CMOS-to-LVDS crosstalk. This page synthesizes distributor pricing, verified drop-in alternatives, application guidance, and design notes not found in the manufacturer datasheet alone.
SN65LVDS105PWRG4 - 1:4 LVDS Clock Fanout Buffer 400Mbps | TI
The Texas Instruments SN65LVDS105PWRG4 is a 1 LVTTL-to-4 LVDS clock fanout buffer and repeater that supports data signaling rates up to 400 Mbps, operates from a single 3 V to 3.6 V supply, and is housed in a 16-pin TSSOP (PW) package. It accepts one low-voltage TTL (LVTTL) input and drives four differential LVDS output pairs that meet or exceed the ANSI EIA/TIA-644 LVDS standard. A clock fanout buffer is a timing-distribution component in the clock and timing hierarchy of a digital system. It takes a single reference clock (or data stream) and replicates it to multiple loads while preserving signal integrity, edge rate, and jitter performance. In LVDS-based systems, the fanout buffer also converts single-ended LVTTL levels to low-voltage differential signaling, which offers common-mode noise immunity and lower electromagnetic emissions than single-ended CMOS or TTL clock distribution. Key features of the SN65LVDS105 include compliance with the ANSI EIA/TIA-644 LVDS electrical standard, typical LVDS output swing of approximately 285 mV into a 100-ohm load, and bus-terminal ESD tolerance that exceeds 12 kV (per TI family datasheet information for this device class). The four LVDS drivers provide deterministic propagation delay with a typical buffer delay of 2.2 ns, enabling predictable multi-load clock skew planning. The device operates from a 3.3 V nominal supply (3 V to 3.6 V range), making it compatible with standard logic rails. The LVTTL receiver input accepts standard 3.3 V logic levels, so the part can sit directly between an FPGA, MCU, or clock generator output and four separate LVDS destinations such as displays, serializers, or data converters. The SN65LVDS104 companion variant accepts differential input levels (+/-100 mV typical) instead of LVTTL, allowing true LVDS repeater designs. Typical applications include backplane clock distribution, point-to-point LVDS data links, LCD panel timing distribution, telecom and networking line cards, and industrial control systems requiring 400 Mbps-class differential signaling over controlled-impedance traces. Design consideration: use 100-ohm differential termination at each LVDS receiver, keep the four output pairs tightly length-matched, and verify supply decoupling with 0.1 uF ceramic capacitors at each VCC pin to minimize jitter contribution. This page synthesizes distributor listings, cross-reference data, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Si5330B-B00205-GM - 1:4 LVDS Clock Buffer 710 MHz 24-QFN
The Skyworks Solutions Si5330B-B00205-GM is a 1:4 LVDS low-jitter, low-skew clock fanout buffer and level translator operating up to 710 MHz, housed in a 24-pin QFN with exposed pad. It accepts one single-ended or differential input and produces four differential (or eight single-ended) low-jitter LVDS outputs, making it well suited for high-performance PCB clock distribution. A clock buffer is a fanout device that takes one reference clock and produces multiple, phase-aligned copies for routing across a printed circuit board. Within the broader clock-tree hierarchy, the Si5330B sits between an upstream PLL/oscillator (frequency generation) and downstream transceivers, ASICs, FPGAs, or ADCs (clock consumption). Unlike a PLL-based clock generator, a buffer preserves the input frequency exactly and only regenerates the edges, minimizing added jitter and avoiding frequency translation artifacts. Key features include 710 MHz maximum input/output frequency, LVDS output format, 1:4 fanout, integrated input level translation (1.8 V, 2.5 V, or 3.3 V core with separate output-bank supply), and minimal crosstalk with strong supply-noise rejection. The exposed-pad QFN-24 package provides a low thermal resistance path for noise-sensitive systems. The device uses a differential LVDS output stage with internal source-terminated architecture, yielding sub-picosecond additive jitter at typical reference frequencies. Independent VDD pins for the input core and the output bank allow level translation without external circuitry, simplifying mixed-voltage designs. Typical applications include high-speed ADC/DAC sampling clocks, FPGA logic clock distribution, telecom/datacom line-card reference clocks, and PCI Express or serializer/deserializer reference fanout. Its low jitter makes it ideal for any noise-sensitive clock domain that needs a clean, multi-drop copy of a single reference. When designing with the Si5330B, follow the datasheet recommended termination for both LVDS inputs and outputs (typically 100 ohm differential) and decouple each VDD pin with a 0.1 uF ceramic placed as close to the IC as possible. The exposed pad must be soldered to a continuous ground plane for both thermal dissipation and controlled impedance. The custom B00205 ordering code defines the factory-set input/output configuration, so verify the variant matches your board's required direction. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on any single distributor listing.
Si5330B-B00205-GMR - 1:4 LVDS Clock Buffer 710MHz | Skyworks
The Skyworks Solutions (formerly Silicon Labs) Si5330B-B00205-GMR is a 1:4 LVDS low-jitter, low-skew fanout clock buffer and level translator housed in a 24-pin QFN-EP (4x4 mm) package. It accepts a single input clock and produces four differential LVDS outputs (or eight single-ended outputs) at frequencies from 5 MHz to 710 MHz, with guaranteed low additive jitter, low skew, and low propagation delay variability. A clock fanout buffer (also called a clock driver or clock distributor) is a semiconductor device that receives one input clock reference and replicates it onto multiple low-skew output clocks. Clock buffers sit in the timing-distribution hierarchy between an upstream PLL/oscillator and downstream loads such as FPGAs, ASICs, ADCs, DACs, and SerDes transceivers. By regenerating edges locally, they isolate the source from load-induced jitter and provide the deterministic phase alignment that high-speed digital links require. Differentiating features of the Si5330B family include a glitchless switching mux for redundant clocking applications, minimal cross-talk between outputs, and superior supply noise rejection that simplifies low-jitter distribution in noisy PCB environments. The device uses advanced CMOS technology, supports independent core and output-bank supply pins for integrated level translation without external circuitry, and accepts CML, HCSL, LVDS, or LVPECL inputs while driving LVDS outputs. The integrated input terminations remove the need for external resistor networks. From an architectural perspective, the Si5330B employs a precision differential input receiver followed by a low-jitter PLL-free fanout tree. Because the device does not synthesize new frequencies (it simply distributes and level-translates), its additive jitter contribution is small enough to preserve overall system margins even at 710 MHz operation. The output drivers are LVDS-compatible, providing the 350 mV swing required by ANSI/TIA/EIA-644 receivers. Typical additive jitter is in the sub-picosecond RMS range. Typical applications include clock distribution in communications infrastructure, redundant clocking for high-availability servers and storage, level translation between PECL/LVDS domains, and PCB-level fanout for FPGA, ASIC, and processor clock inputs. The wide 5-710 MHz operating range covers virtually all common telecom, networking, and computing reference frequencies. When designing with the Si5330B, designers should size the output-bank and core supply decoupling per Skyworks' reference layout and observe the LVDS receiver termination requirements (typically 100 ohm differential). The exposed pad must be soldered to a low-impedance ground plane for thermal and electrical performance. This page synthesizes distributor pricing, drop-in alternatives from the same Skyworks Si5330 family, and practical PCB layout notes not consolidated in the manufacturer datasheet.
Si5341B-B04862-GM - 10-Output Ultra-Low Jitter Clock Generator | Skyworks
The Skyworks Solutions Si5341B-B04862-GM is a pre-programmed, custom-configured variant of the Si5341B ultra-low jitter any-frequency clock generator family. The device delivers up to 10 differential or single-ended clock outputs at any frequency up to 750 MHz (with <350 MHz jitter-optimized outputs available), in a 64-pin QFN (9x9 mm) package with exposed pad for thermal dissipation. The on-board MultiSynth technology generates independent fractional-N synthesizers per output, allowing non-integer frequency relationships that cannot be realized by integer-N PLLs. A clock generator (also called a frequency synthesizer or PLL-based timing IC) is a mixed-signal integrated circuit that takes one or more low-jitter reference inputs (typically a crystal or LVDS/CMOS reference) and produces one or more precise output frequencies locked to that reference. Within the broader hierarchy it sits as: clock generator -> PLL/VCXO -> timing IC -> power management & signal chain. Unlike a simple clock buffer, a clock generator can translate frequency (e.g., 25 MHz in to 156.25 MHz out), translate format (LVCMOS to LVDS/LVPECL/HCSL/CML), and re-multiply reference, all while adding typically <100 fs RMS phase jitter to the signal. Key features of this Si5341B configuration include typical RMS phase jitter of 50 fs (12 kHz-20 MHz, per the Si5341/40 family datasheet), integrated LDOs that accept a single 1.8V/2.5V/3.3V supply, two differential reference inputs with automatic or manual switching, programmable output slew rate and amplitude, and per-output enable / glitchless start/stop. The device is configured via I2C/SPI and the Skyworks ClockBuilder Pro software. Architecturally the Si5341B combines a low-noise integer-N PLL locking to the reference, a MultiSynth fractional-N divider tree per output, and an output-driver block supporting LVCMOS, LVDS, LVPECL, HCSL, and CML. The MultiSynth architecture eliminates the need for bulky external VCXOs in most applications because any fractional multiplication ratio is supported without integer-boundary spurs. Typical applications include 10G/25G/100G Ethernet PHY clocking, OTN/WDM optical transport line cards, FPGA reference clock trees, broadcast video reference generation, JESD204B/C ADC and DAC sampling clocks, and PCIe Gen3/4/5 clock fan-out. Each output can be set independently so a single Si5341B-B04862-GM can replace multiple crystal oscillators on a high-density PCB. When designing with this part, follow the reference schematic in the Si5341/40 Family Reference Manual exactly. Place the 0.1 µF + 1 µF supply decoupling pair directly at the AVDD/VDD pins, route the reference input traces as 50 Ω controlled-impedance differential pairs, and provide a continuous ground plane beneath the exposed pad with at least 12 thermal vias to the internal layer. This page synthesizes Skyworks datasheet specifications, current distributor pricing as of 2026-10-10, drop-in replacement options within the Si5341/Si5340 family, and practical design notes that complement (but do not replace) the manufacturer documentation.
ZL30772LFG7 - Dual-Channel IEEE 1588/SyncE Packet Clock Synchronizer | Microchip
The Microchip ZL30772LFG7 is a dual-channel packet clock network synchronizer IC integrating an IEEE 1588-2008 Precision Time Protocol (PTP) software stack with hardware-assisted synchronization, designed for Ethernet, SONET/SDH, and wireless base station timing applications. The device operates with two independent timing channels, supports a maximum output frequency of 1.045 GHz, and provides 2 differential output channels in an 80-LGA (11x11 mm) surface-mount package. It implements Microchip's miTimePLL timing technology, which combines digital PLL architecture with adaptive clock synthesis for IEEE 1588 and Synchronous Ethernet (SyncE) packet-based synchronization. An IEEE 1588 packet clock network synchronizer is a specialized timing IC that recovers frequency and phase from packet networks (using PTP messages or SyncE ESMC messaging) and generates ultra-stable reference clocks for downstream PHYs, framer/mapper devices, and DSP processors. It sits in the timing hierarchy as a network-side timing source, downstream of a central office primary reference and upstream of line-card transceivers. ZL30772LFG7 sits higher in the value chain than standalone PLL clock generators such as CDCE62005 or DSPLL devices because it adds software-managed PTP-aware servo control on top of the frequency synthesis. Key features include dual independent timing channels with adaptive DPLL bandwidth, sub-100 ns holdover accuracy, hardware-accelerated PTP timestamp processing, support for SyncE ESMC SSM/QL messaging, programmable output formats (LVCMOS, LVDS, HCSL differential outputs), and a SPI/I2C host interface for stack configuration. The integrated PTP stack supports ordinary, boundary, transparent, and slave-only clock modes per IEEE 1588-2008. Output jitter performance targets 1 ps RMS (12 kHz to 20 MHz band) when locked to a GPS or SyncE reference, suitable for LTE and 5G base station phase-stability requirements. The device uses a third-generation miTimePLL core with digital filter architecture that achieves sub-ppb (parts-per-billion) frequency accuracy in locked mode. Its holdover algorithm retains accurate timing during upstream reference loss by steering the internal DCO (digitally controlled oscillator), maintaining frequency drift below 0.01 ppb for short holdover intervals. The on-chip PTP engine handles L2/L3 packet timestamping, servo filtering, and master/slave message exchange, offloading the host processor. Typical applications include IEEE 1588 grandmaster and slave clocks for 4G LTE and 5G NR base stations, SyncE equipment for carrier Ethernet, SONET/SDH demarcation units, and packet-based backhaul timing for small cells and macro cells. The wide frequency coverage (1 Hz to 1.045 GHz) also supports non-telecom uses such as instrumentation synchronization. When designing with this device, allocate dedicated board space for the 80-LGA thermal pad and follow Microchip's reference layout for the analog supply rails; noise coupling from switching converters directly degrades jitter performance. Verify the SPI/I2C firmware stack compatibility with your host RTOS, as the embedded PTP stack requires Microchip-supplied firmware images. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet for engineers evaluating the ZL30772LFG7.