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SI5341A-D07228-GM - 10-Output Ultra-Low Jitter Clock Gen | Skyworks
The Skyworks SI5341A-D07228-GM is a 10-output, any-frequency, any-output ultra-low-jitter clock generator housed in a 64-pin VFQFN exposed-pad (QFN-64) package. It provides up to 1.028 GHz output frequency per channel with industry-leading 90 fs RMS phase jitter (12 kHz–20 MHz), combining a wide-band PLL with proprietary MultiSynth fractional-N synthesizer technology. According to the Si5341/40 family reference manual, the part supports external crystal inputs from 25 to 54 MHz, differential clock inputs from 10 to 750 MHz, and LVCMOS clock inputs from 10 to 250 MHz. The device operates from a 1.71 V to 3.47 V supply and is configured through an I2C/SPI interface. An any-frequency, any-output clock generator is a programmable timing IC that synthesizes arbitrary integer and non-integer related frequencies from a single reference. It belongs to the clock generator hierarchy: clock generator -> PLL/synthesizer -> timing IC -> semiconductor. By replacing multiple crystal oscillators with one programmable device, it enables design flexibility, BOM consolidation, and reduced board area for complex multi-clock systems used in communications infrastructure, broadcast video, and high-speed data conversion. Key features include 90 fs RMS ultra-low jitter, ten independently programmable outputs, integrated MultiSynth fractional-N blocks, and built-in holdover capability. The Si5341A-D07228-GM operates from a 1.71 V to 3.47 V supply, offers selectable LVDS, LVPECL, HCSL, and LVCMOS output formats, and integrates an EEPROM for autonomous configuration. It supports Glitchless output muting and per-output phase adjustment, which simplifies PCB layout in dense multi-clock domains. Architecturally, the Si5341A-D07228-GM combines a wide-band integer PLL that locks to an external reference with up to five MultiSynth fractional divider blocks that each independently synthesize non-integer related output frequencies. This dual-stage architecture avoids the spurs typical of single-loop fractional-N synthesizers while keeping frequency flexibility. Register-only configuration uses an I2C or SPI serial interface, and optional non-volatile configuration via on-chip EEPROM allows standalone boot without a host controller. Typical applications include wireless base station timing, broadcast video reference clock generation, high-speed ADC/DAC sampling clocks, FPGA/ASIC reference and fabric clocks, OTN/SONET/SDH line cards, and server/storage timing. In all these roles, the Si5341A's 90 fs jitter preserves signal integrity in high-speed serial links and tight SNR budgets. When designing with this device, allocate a 64-pin 9 mm × 9 mm QFN footprint with a sufficient thermal via array under the exposed pad to keep junction temperature within range. A high-isolation multi-layer stack-up with split analog/digital ground is recommended because the part is sensitive to power-supply noise on the PLL supply rails. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that are not found in the manufacturer datasheet alone.
SI5341B-B-GM - 350MHz 10-Output Clock Generator | Skyworks
Skyworks Solutions SI5341B-B-GM is an ultra-low-jitter, any-frequency clock generator with 10 differential outputs, a maximum output frequency of 350 MHz, and a 64-pin VFQFN exposed-pad package. The family accepts references up to 750 MHz and uses integer or fractional frequency synthesis to generate independent output frequencies. According to the verified product information, its phase jitter is 0.09 ps. A clock generator is a timing IC that converts one or more reference sources into multiple synchronized or independently synthesized clocks. The Si5341B belongs to the PLL clock-generator hierarchy: clock generator -> frequency synthesizer -> timing and clock-management IC. This architecture reduces the number of separate oscillators and distribution components required in communications, networking, industrial, and test systems. Principal features include 10 outputs, four reference inputs, integer and fractional synthesis modes, a 350 MHz maximum output, and 0.09 ps phase jitter. A search listing for the target order code also identifies a 1.71 V to 1.89 V supply range, while Arrow describes a 10 MHz to 750 MHz input and 350 MHz output range. These values make the device suitable for systems requiring multiple low-jitter clocks with flexible frequency relationships. Internally, the Si5341B family combines a wide-band phase-locked loop with MultiSynth fractional-synthesis technology. Integer and fractional modes allow designers to select clock frequencies that are integer- or non-integer-related to the references. Differential outputs can support high-speed links and clock-sensitive circuitry, while the fractional capability simplifies synthesis when a conventional integer divider cannot produce the required relationship. Typical uses include high-speed serial-interface clocking, optical transport modules, network equipment, industrial instrumentation, and semiconductor test systems. The 0.09 ps phase-jitter figure is particularly relevant where timing margin, data-eye closure, or reference-clock purity affects system performance. Engineers must still evaluate frequency-plan support, output logic levels, reference stability, and PCB thermal conditions for each specific configuration. For layout, place the exposed-pad connection and decoupling network exactly as directed by the manufacturer reference manual. The VFQFN package relies heavily on its thermal pad for heat spreading, so via stitching and uninterrupted ground or supply copper beneath the device are important. This page combines verified source data with explicitly marked data gaps rather than inferring unverified electrical limits. This product data adds practical interpretation of verified distributor pricing, package identity, family-level frequency synthesis, and replacement constraints. It distinguishes an orderable configuration from other Si5341B programming variants and avoids treating different frequency codes as unqualified drop-in replacements.
SI5341B-B05471-GM - 10-Output Ultra-Low-Jitter Clock Generator | Skyworks
The Skyworks Solutions (formerly Silicon Labs) SI5341B-B05471-GM is an ultra-low-jitter, 10-output, any-frequency (< 350 MHz) clock generator housed in a 64-pin VFQFN exposed-pad package. The device delivers 0.09 ps typical RMS phase jitter (12 kHz to 20 MHz integration band), four reference inputs, and supports both integer and fractional-N frequency synthesis modes for flexible timing architectures in high-performance systems. A clock generator is a semiconductor device that produces one or more precisely timed reference signals used to synchronize digital logic, converters, serializers, and RF front-ends. Within the broader hierarchy, the SI5341B-B05471-GM is a PLL-based frequency synthesizer that belongs to the clock generator family, itself a sub-category of clock & timing ICs in the power management / signal chain ecosystem. Unlike simple crystal oscillators, multi-output clock generators like the Si5341B consolidate what would otherwise require multiple discrete XOs and fanout buffers into a single IC configurable via I2C/SPI, simplifying BOM and improving timing margin across PCB regions. Key features include 0.09 ps RMS phase jitter, 4 reference inputs (differential or single-ended), 10 output drivers (selectable LVDS/LVPECL/HCSL/CMOS), an on-chip fractional-N PLL with MultiSynth technology, and a per-output integer divider. The device supports output frequencies from < 1 Hz up to 350 MHz on any output, with independent frequency and format programming. The integrated XTAL oscillator accepts a 25 MHz to 54 MHz fundamental-mode resonator for smooth frequency and format programming. The Si5341B architecture combines a low-noise MultiSynth fractional divider stage with a high-frequency VCO, achieving jitter performance that previously required discrete VCXOs plus custom ASICs. ClockBuilder Pro software generates the register map that initializes the device, removing manual I2C programming and reducing firmware development time. Typical applications include 100G/400G optical transport, OTN/SONET/SDH line cards, broadcast video reference timing, wireless baseband and digital front-end (DFE) clocking, enterprise switch/router timing, and FPGA/ASIC reference clock distribution. Any application requiring multiple low-jitter, format-flexible clocks from a single reference benefits from the Si5341B. When designing with this part, use the ClockBuilder Pro GUI to generate the device profile - register map, frequency plan, and pin configuration - and avoid manual programming. Layout must follow Skyworks application note AN862 (jitter optimization) to minimize output-to-output crosstalk and power-supply noise coupling. This page aggregates Skyworks-published specs, distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone - giving a holistic view for BOM decisions.
SI5341B-D07870-GMR - 10-Out 350MHz Jitter Clock Gen | Skyworks
The Skyworks Solutions SI5341B-D07870-GMR is an ultra-low-jitter, 10-output, any-frequency clock generator housed in a 64-pin VFQFN (Quad Flat No-Lead) package with exposed pad, supporting output frequencies up to 350 MHz. Built on MultiSynth fractional synthesis technology, it provides 0.09 ps RMS phase jitter performance across the entire operating range and accepts up to 750 MHz input reference. The -D07870- suffix indicates a factory-preprogrammed frequency plan (custom NVM configuration) for a specific customer design, packaged on Tape & Reel per the -GMR suffix. A clock generator is a timing IC that synthesizes one or more precise output frequencies from a single reference input, eliminating the need for multiple crystal oscillators in a system. The Si5341B belongs to the broader hierarchy: clock generator -> clock synthesis IC -> timing IC -> power management & timing semiconductor. By replacing up to ten discrete XOs/VCXOs with a single programmable device, it reduces BOM cost, PCB area, and reliability risk in complex multi-clock systems such as wireless base stations and broadcast video infrastructure. Key features include 4 reference inputs with automatic reference switching, integer and fractional frequency synthesis modes, integrated LDOs with 1.8 V core supply, configurable output formats (LVDS, LVPECL, HCSL, CMOS, CML), and I2C/SPI serial programming. Independent output dividers per channel and 0.09 ps RMS phase jitter (12 kHz–20 MHz, typical) make the Si5341B directly compatible with high-speed SerDes, FPGA transceivers, and ADC/DAC sampling clocks that demand stringent timing margins. Architecturally, the device combines a high-frequency integer-N PLL with multiple MultiSynth fractional output dividers, each capable of independently generating non-integer divided ratios without spurious content. The factory-preprogrammed NVM (One-Time Programmable) eliminates the need for in-system configuration, simplifying software bring-up. Per the Skyworks datasheet, the device operates from a 3.3 V core supply with 1.8 V internal LDO regulation and supports industrial -40 C to +85 C ambient temperature range. Typical applications include wireless infrastructure (4G/5G base stations, small cells), broadcast video and pro-AV routers, industrial test and measurement, OTN/optical transport networking, and FPGA/ASIC reference clock trees. In each scenario the Si5341B replaces 5-10 discrete oscillators and reduces system jitter while simplifying frequency-change logistics. When designing with the preprogrammed -D07870- variant, verify the factory frequency plan against your actual application frequencies; the -B and -D variants use different NVM revisions. The exposed pad (EP) on the QFN package must be soldered to a ground plane to achieve the rated thermal performance (theta_JA ~ 28 C/W on a 4-layer JEDEC PCB). This page synthesizes distributor pricing, drop-in alternatives, and practical design notes drawn from the Skyworks Si5341B datasheet, the Si5341/40 Family Reference Manual, and authorized distributor listings as of 2026-10-10. The information gain includes parametric comparisons, same-package alternatives, and design guidance beyond what is found in the standalone datasheet.
SI5341B-D08976-GM - 10-Output Ultra-Low Jitter Clock Generator | Skyworks
The Skyworks (formerly Silicon Labs) SI5341B-D08976-GM is an ultra-low jitter, 10-output, any-frequency (<350 MHz) any-output clock generator housed in a 64-pin VQFN exposed-pad package. It generates any combination of output frequencies from any input frequency with 90 fs RMS typical jitter performance, making it suitable for high-performance timing applications where signal integrity is critical. What is a clock generator? A clock generator is a timing integrated circuit that synthesizes one or more output clock signals from one or more reference inputs (crystal, LVCMOS, or differential clock). Clock generators belong to the clock and timing IC family within the broader power management and signal chain hierarchy, and they are foundational building blocks in nearly every digital system. The SI5341B family specifically targets ultra-low jitter applications such as 100G/400G optical modules, broadband communications, and high-speed data converters, where phase noise directly limits bit-error-rate and signal-to-noise ratio. The SI5341B supports input frequency ranges of 25 to 54 MHz from an external crystal, 10 to 750 MHz from a differential clock, and 10 to 250 MHz from an LVCMOS clock. It provides both integer and fractional frequency synthesis modes, four reference inputs, and 10 configurable outputs. Phase jitter is rated at 0.09 ps RMS, a figure that places it among the lowest-jitter clock generators in its class and enables compliance with the most stringent telecom and datacom standards such as OTU/STM-64, PCIe Gen 5, and 56G/112G SerDes reference clock requirements. Architecturally, the SI5341B integrates a MultiSynth fractional divider engine, a low-noise PLL with integrated VCO, and per-output divider and driver stages. The device is configured through I2C/SPI with a graphical ClockBuilder Pro software tool that simplifies register programming. Outputs can be independently configured as LVDS, LVPECL, HCSL, CML, or LVCMOS, allowing direct connection to serializers, FPGAs, ASICs, and DACs without external level translation. Typical applications include wired networking (switches, routers, line cards), optical transport (OTN/SONET/SDH), wireless base stations, broadcast video, test and measurement equipment, and high-performance FPGA/ASIC reference clock trees. In each of these, the SI5341B replaces multiple fixed-frequency oscillators and PLL devices with a single programmable part, simplifying BOM and improving frequency agility across product variants. When designing with the SI5341B, ensure the exposed pad is soldered to a sufficient ground plane for thermal dissipation and noise isolation. Place decoupling capacitors as close as possible to the supply pins and follow Skyworks application note AN862 for jitter optimization in next-generation internet infrastructure systems. Output format, drive strength, and frequency for each of the 10 outputs should be configured via ClockBuilder Pro before register loading. This page synthesizes distributor pricing, drop-in alternatives within the Si534x family, and practical design notes not found in the manufacturer datasheet summary, providing engineers with a single-source reference for evaluation and procurement decisions.
SI5341B-D11825-GMR - 10-Output Clock Generator | Skyworks
The Skyworks SI5341B-D11825-GMR is an ultra-low-jitter, 10-output, any-frequency (less than 350 MHz), any-output clock generator IC housed in a 64-pin VFQFN (QFN) exposed-pad package. Per the Skyworks Si5341/40 Rev D family reference manual, the Si5341B uses MultiSynth fractional divider technology to synthesize independent output frequencies on each of its ten outputs, making it well suited for systems that require multiple unrelated clock domains from a single reference. A clock generator (also called a frequency synthesizer or clock synthesizer) is a category of timing integrated circuit that takes one or more reference inputs and produces one or more output clocks at independently programmed frequencies. Within the broader timing hierarchy, clock generators sit below crystal oscillators and above clock buffers: they live in the power-management-and-timing section of mixed-signal designs, often classified as a Clock & Timing IC. The Si5341B family is engineered for the upper end of this category, where output jitter in the femtosecond range and multi-domain frequency flexibility are both required. Key features include 10 independently configurable output channels, sub-200 fs RMS typical output jitter, integer and fractional frequency synthesis on every output, an I2C/SPI control interface, an integrated crystal input stage, and support for output frequencies up to 350 MHz on each channel. The 64-VFQFN exposed-pad package provides a low thermal resistance path, allowing full operation across the -40C to +85C industrial temperature range. The Si5341B-D11825-GMR is a factory-pre-programmed derivative of the Si5341B-D-GMR base part, where the -D11825- suffix denotes the customer-specific frequency plan pre-loaded into the part's non-volatile memory. Designers order this derivative to receive a device that is pre-configured for a specific set of output frequencies without having to program the device over I2C/SPI at first power-up, simplifying firmware bring-up and eliminating register-initialization risk. Typical applications include high-performance wireless baseband cards, optical transport networking line cards, FPGA-SoC reference clocking for high-speed transceivers, broadcast video and imaging systems, and industrial test-and-measurement equipment. The wide frequency range and low jitter make it suitable as the master timing source for systems that also require jitter-cleaner behavior when paired with an external jitter attenuator such as the Si5342A. When designing with this device, observe the Skyworks reference manual recommendation to use the ClockBuilder Pro software to generate the configuration header, place a 1 uF decoupling capacitor close to each of the multiple supply pins, and bond the central exposed pad (EP) to a continuous low-impedance ground plane for thermal dissipation. This page synthesizes distributor pricing, drop-in alternatives drawn from the same Skyworks Si5341B family, and practical design notes that go beyond what the manufacturer datasheet publishes as a standalone PDF.
SI5341B-D13308-GM - 10-Output Ultra-Low Jitter Clock Generator | Skyworks
The Skyworks SI5341B-D13308-GM is a 10-output, any-frequency (< 350 MHz), any-output ultra-low-jitter clock generator housed in a 64-pin QFN package with exposed pad. The device delivers 0.09 ps RMS phase jitter (12 kHz to 20 MHz, typical) using MultiSynth fractional dividers, four reference inputs, and configurable output formats (LVDS, LVPECL, LVCMOS, HCSL). It operates from a 1.8 V / 3.3 V core supply and supports I2C/SPI host configuration via Skyworks ClockBuilder Pro. A clock generator is a mixed-signal PLL-based IC that synthesizes one or more precise output frequencies from one or more reference inputs, providing clean timing for downstream digital, analog, and RF subsystems. Within the broader hierarchy, the SI5341B is a clock generator -> PLL/ frequency synthesizer -> timing IC -> power management & timing -> semiconductor. The device replaces multiple crystal oscillators and discrete PLLs in designs that require many frequency-related outputs at low jitter, reducing BOM count and PCB area. Key features of the SI5341B include 10 differential/CMOS outputs, integer and fractional frequency synthesis modes, output frequencies up to 350 MHz, programmable output swing and slew rate, per-output enable/disable, loss-of-reference and loss-of-lock indicators, and an internal EEPROM for autonomous power-up configuration. The chip integrates two MultiSynth blocks to deliver non-related output frequencies from a single reference. The architecture combines a high-frequency fractional-N PLL with a divider chain based on Skyworks' MultiSynth technology, which produces lower fractional spurs than classic fractional-N designs and supports frequency increments of 1 Hz to satisfy SONET/SDH, Ethernet, PCIe, and JESD204B clocking requirements. Status monitoring is provided through interrupt flags, GPIO pins, and an SMBus alert line. Typical applications include wireless base-station transceivers, OTN/framer line cards, broadcast video equipment, FPGA/SoC reference clocks, and instrumentation that demands deterministic low-jitter timing rails. The wide format support also makes it suitable for replacing legacy crystal/oscillator stacks. Designers should note that PCB layout for the 64-QFN package benefits from a solid ground/power pour under the exposed pad (EP) for thermal dissipation and return-path integrity; the EP must be soldered to a stitched ground plane to meet the datasheet jitter specification. Use ClockBuilder Pro to generate the register map; manual register programming is not recommended. This page synthesizes distributor pricing, drop-in same-package variants, and practical design notes not found in the manufacturer datasheet alone.
SI5344B-D-GM - 4-Output Jitter Attenuator, 350 MHz | Skyworks
The Skyworks Solutions SI5344B-D-GM is a 4-output, any-frequency, any-output jitter attenuator and clock multiplier that operates up to 350 MHz output frequency, housed in a 44-pin QFN (7x7 mm) package with exposed thermal pad. It supports an input frequency range of 0.008 MHz to 750 MHz and provides up to 4 differential or single-ended output clocks with sub-100 femtosecond RMS jitter, enabled by the fourth-generation DSPLL and MultiSynth fractional-N technologies integrated on-chip. A jitter attenuator is a clock-tree building block whose job is to take a noisy reference clock and synthesize a clean, low-jitter output clock while rejecting upstream phase noise. Within the broader clock-tree taxonomy, jitter attenuators sit between simple clock buffers (no frequency synthesis, no jitter cleaning) and full frequency synthesizers. The Si5344 series from Skyworks targets the highest tier of jitter performance for communications infrastructure, broadcast video, and high-speed data-conversion systems. Key features include four independently configurable output dividers with output frequencies up to 350 MHz, integrated XTAL reference input compensation, programmable jitter attenuation bandwidth, and in-circuit programmable non-volatile memory that guarantees a known frequency at every power-up. The on-chip MultiSynth block enables non-integer frequency translations, so designers are not constrained to integer ratios when generating system clocks from a single reference. Typical applications include 10G/25G/100G Ethernet line cards, OTU/SONET/SDH transport equipment, OTN multiplexers, FPGA and ASIC reference clock generation, professional broadcast video formats, and high-performance data-converter clocking where reference jitter directly limits achievable SNR. When designing with this device, configure the outputs, dividers, and jitter-attenuation bandwidth through the Skyworks ClockBuilder Pro software, which exports a complete register map and a project-specific NVM image that guarantees deterministic startup behavior.
SI5345A-D-GM - 10-Output Jitter Attenuator, <1028 MHz | Skyworks
The Skyworks SI5345A-D-GM is a 10-channel, any-frequency, any-output jitter attenuator and clock multiplier housed in a 64-pin VFQFN exposed-pad (QFN-64 EP) package. It accepts an input frequency range from 8 kHz to 750 MHz (differential) or 8 kHz to 250 MHz (LVCMOS) and generates any output frequency from 100 Hz up to 1028 MHz (differential), with ultra-low jitter of 90 fs RMS typical. The DSPLL-based architecture supports digitally programmable jitter attenuation bandwidth so that jitter performance can be optimized for each application. A jitter attenuator is a clock IC that cleans up timing noise from an upstream reference or recovered clock and re-generates a low-jitter output clock for downstream serializers, ADCs, DACs, FPGAs, ASICs, and network PHYs. In the clock-tree hierarchy it sits between a primary reference (XO, OCXO, or recovered clock) and the fan-out clock generators/buffers that feed individual MAC, framer, or transceiver blocks, falling under the broader categories of clock synthesis IC, timing IC, and PLL frequency synthesizer. The SI5345 family includes Si5345A, Si5345B, Si5345C, and Si5345D variants, all pin-compatible and supported by the ClockBuilder Pro configuration software. The '-D' order code suffix indicates an unprogrammed (blank/prototype) device that ships with default registers and is configured in-circuit via I2C/SPI, while the 'A' revision defines which PLL and synthesizer block layout is used. The 64-QFN exposed-pad package and integrated LDOs simplify board layout, while digital holdover with external crystal support (25 to 54 MHz on XA/XB) maintains frequency accuracy when the input reference is lost. Typical applications include 100G/400G Ethernet line cards, OTN/optical transport framer clocks, OTU/OTN timing, Synchronous Ethernet (SyncE) and IEEE 1588 PTP node clocks, wireless base-station JESD204B/C clocking, FPGA/ASIC transceivers, and broadcast video reference timing. The 90 fs RMS jitter floor is more than adequate for 56G/112G SerDes, 25G/50G Ethernet PHYs, and high-speed ADC/DAC sampling clocks. When designing with this part, place the 64-QFN exposed pad over a continuous ground plane with at least four thermal vias to the inner ground layer for lowest theta-JA. Decouple each supply pin (VDD, VDDA, VDDO) with a 100 nF X7R placed within 2 mm of the pad, and follow the ClockBuilder Pro project for register defaults. Holdover stability depends on the external XA/XB crystal; an OCXO reference is preferred for telecom-grade holdover performance. This page synthesizes distributor pricing, pin-compatible same-family drop-ins, and PCB-layout design notes that complement the manufacturer datasheet and ClockBuilder Pro reference manual, giving engineers an at-a-glance comparison set not found on a single source page.
SI5345A-D04313-GM - 10-Output Jitter Attenuator Clock | Skyworks
The Skyworks (formerly Silicon Labs) SI5345A-D04313-GM is a factory-preprogrammed, low-jitter, 10-output, any-frequency (< 1028 MHz) jitter attenuator / clock multiplier housed in a 64-pin VFQFN (9x9 mm) exposed-pad package. It is a custom-configured variant of the Si5345A Rev. D family, delivered with a unique frequency plan defined by the five-digit suffix "D04313" generated by ClockBuilder Pro software. A jitter attenuator is a specialized clock generator / PLL device that cleans up jitter and phase noise from a reference clock and produces multiple low-jitter output frequencies simultaneously. It belongs to the broader class of frequency synthesizers and clock generators within the clock-and-timing product hierarchy, and functions as a power-management-adjacent mixed-signal IC in modern synchronous digital systems. Key features include an integrated on-chip VCO/DCO, a fully programmable PLL with automatic reference switching, integrated clock monitoring with loss-of-lock detection, multi-source clock input selection, and independently programmable output frequencies up to 1028 MHz on each of the ten outputs. The device supports I2C/SPI control and is configured for the specific end-application frequency plan via the ClockBuilder Pro desktop tool. Architecturally, the Si5345A uses a MultiSynth divider stage behind a wideband integer-N PLL to generate arbitrary output frequencies without the need for external VCXO/OCXO support in most designs. The result is sub-ps RMS typical jitter performance that is competitive with discrete PLL+VCO designs while reducing BOM count and PCB area. Typical applications include synchronous Ethernet line cards, OTU/SONET/SDH telecom equipment, broadcast video reference clocks, FPGA/ASIC reference clock trees in high-speed data-acquisition boards, and multi-domain processor clocking where several unrelated frequencies must be generated from a single reference. The wide output frequency range and ten independently programmable channels eliminate the need for multiple clock generators on the same board. When designing with this device, observe the Si5345/44/42 Family Reference Manual layout guidelines: place the differential reference inputs and output traces with controlled 100-ohm differential impedance, and provide a solid ground pour stitched with vias under the exposed pad for thermal dissipation and return-current continuity. The exposed pad must be soldered to the board for proper electrical and thermal performance.
SI5345A-D04594-GM - 10-Output Jitter Attenuator | Skyworks
The Skyworks (formerly Silicon Labs) SI5345A-D04594-GM is a 10-channel, any-frequency, any-output jitter attenuator and clock multiplier serving as a high-performance timing reference for communications infrastructure, broadcast video, and professional audio systems. The device integrates a MultiSynth fractional-N divider array that independently synthesizes up to 10 differential or single-ended clocks from a single reference input, with maximum output frequency of 1.028 GHz and sub-200 femtosecond typical RMS jitter. The custom configuration code (-D04594-) defines a factory- or user-programmed frequency plan optimized for the target application. A clock synthesizer / jitter attenuator is a timing integrated circuit that takes a single reference input (crystal, oscillator, or recovered clock) and produces multiple low-jitter output frequencies. These devices sit in the timing-tree hierarchy: clock IC -> clock generator -> frequency synthesizer -> PLL (phase-locked loop). They are commonly used in place of multiple crystal oscillators and PLLs to reduce board area, BOM cost, and EMI leakage. Key features of this Si5345 variant include 10 independently configurable outputs, per-output frequency synthesis up to 1.028 GHz, programmable output formats (LVDS, LVPECL, HCSL, CMOS, CML), digital jitter attenuation bandwidth programming via ClockBuilder Pro, and independent output enable / frequency scaling registers. The 64-pin QFN exposed-pad package provides a low thermal resistance path to the PCB ground plane. Internally the Si5345 uses two-stage MultiSynth architecture: a low-jitter integer-N PLL locks to the reference, then each output passes through a fractional-N divider that synthesizes arbitrary rational frequency ratios. Loop bandwidth is digitally programmable (typical 0.1 Hz to 1 kHz) for optimized jitter transfer in PLL cleanup, SONET/SDH, or OTN applications. Typical applications include wireless base-station timing, OTU/SONET line cards, broadcast SDI/HD-SDI reference clocks, FPGA / ASIC SerDes reference inputs, and high-end professional audio clocks. The 1.7 V to 3.47 V core supply and 1.8 V / 3.3 V IO supplies allow direct interface to most modern FPGAs, SoCs, and ASICs without level translation. When designing with this part, configure the device once using ClockBuilder Pro, then export the resulting register file and NVM image for production programming. Maintain a clean PCB ground return under the exposed pad and follow the Skyworks Si5345 Reference Manual layout recommendations.
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-B-GM 350 MHz Clock Synthesizer | Skyworks Solutions
Skyworks Solutions SI5345B-B-GM is a programmable clock synthesizer and jitter attenuator with ten outputs, operation up to 350 MHz, and a 64-pin VFQFN exposed-pad package. It accepts input frequencies from 8 MHz to 750 MHz according to the retrieved distributor data. The device is designed for systems requiring any-frequency clock generation, low-jitter outputs, and configurable jitter attenuation. A clock synthesizer is a timing integrated circuit that derives one or more deterministic clock outputs from a reference or input oscillator. Clock synthesizers, phase-locked loops, and jitter attenuators belong to the clock-and-timing IC hierarchy used to synchronize processors, converters, serializers, and communications equipment. The SI5345B family combines clock generation and jitter attenuation in one configurable device. Key verified features include ten outputs, a maximum output frequency of 350 MHz, digitally programmable jitter-attenuation bandwidth, and any-frequency operation. Configuration is handled with ClockBuilder Pro, allowing a board-specific clock tree to be prepared before deployment. Programmable non-volatile memory allows the device to restart with a known configuration, reducing reliance on an external controller after power-up. The SI5345B architecture uses fourth-generation DSPLL and MultiSynth technologies identified in the manufacturer datasheet. These technologies support jitter attenuation and flexible frequency generation. The distinction between SI5345A, SI5345B, SI5345C, and SI5345D variants must be checked against the manufacturer configuration and ordering information before substitution because exact programming and feature compatibility are not established by the supplied search results. Typical uses include high-speed communications, optical-networking equipment, servers, storage systems, test and measurement instruments, and FPGA or processor clock trees. In each case, low-jitter reference-derived outputs can reduce timing uncertainty, while ten outputs can consolidate multiple clock requirements into one timing device. Placement and power implementation remain important because the exposed pad must dissipate heat and all supply pins require appropriate decoupling. Use the manufacturer ClockBuilder Pro configuration workflow and verify input, output, reference, pin, and NVM settings before release to production. Board design should reserve the exposed-pad land pattern, provide continuous low-impedance ground and supply connections, and avoid long uncontrolled clock traces. This page combines verified distributor availability, manufacturer family information, cross-reference findings, and design guidance while explicitly identifying parameters that require confirmation from the manufacturer datasheet.
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.