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製品 (137)
SI52208-A02AGMR - 8-Output PCIe Gen 1-4 Clock Generator | Skyworks
The Skyworks Solutions SI52208-A02AGMR is an 8-output PCI Express clock generator for 1.5 V to 1.8 V PCIe Gen 1/2/3/4 and SRIS applications, housed in a 48-pin QFN (6x6 mm) package. It delivers 100 MHz, 133 MHz, or 200 MHz differential HCSL outputs with hardware- and I2C-controlled frequency selection, individual output enable pins, and integrated 85 ohm internal termination. It supports spread-spectrum enable/disable for EMI reduction, in line with PCIe Gen 1 through Gen 4 jitter requirements, plus SRIS-compliant operation. The A02 order code targets Gen 1/2/3/4 with 25 MHz LVCMOS reference input. A PCI Express clock generator is a dedicated timing IC that synthesizes the low-jitter reference clocks required by PCIe root complexes, endpoints, switches, and retimers. It belongs to the broader category of clock generators and timing ICs within the timing-and-signal-conditioning block of a computing platform, and is typically placed adjacent to the PCIe PHY or switch to minimize trace-induced jitter. Key features include a 1.5 V to 1.8 V supply range, low power consumption, hardware pin and I2C programmability for output enable and spread spectrum, and integrated 85 ohm source termination that eliminates external resistors on each differential output pair. Compliance with PCIe Gen 1/2/3/4 phase jitter and SRIS reference-clock architectures allows direct deployment in SRNS and SRIS systems without additional PLL stages. Typical applications include desktop and server PCIe slot clocking, NVMe SSD controllers, PCIe switch reference-clock trees, riser cards, and embedded-computing PCIe endpoints. The wide frequency support (100/133/200 MHz) covers Gen 1/2 (100 MHz) and Gen 3/4 (100 MHz with optional spread) plus a 25 MHz LVCMOS reference path for downstream clocking. When designing with this device, follow Skyworks reference-layout guidance for the 48-QFN exposed pad to achieve the published jitter and supply-noise performance. Decouple VDD with 0.1 microfarad plus bulk ceramic caps placed within 2 mm of the pins, and route differential pairs to maintain 100 ohm differential impedance with matched length within 5 mils. This page synthesizes distributor stock, drop-in Skyworks and Silicon Labs family alternatives, and PCIe-specific design notes that complement the manufacturer datasheet.
SI53102-A3-GMR - 1:2 PCIe Gen4 Clock Buffer, 8-TDFN | Skyworks
The Skyworks Solutions SI53102-A3-GMR is a high-performance 1:2 PCI Express fan-out clock buffer that delivers two low-power, PCIe-compliant differential clock outputs from a single reference input. Housed in a compact 1.4 mm x 1.6 mm 8-pin TDFN-EP surface-mount package, the part operates at 100 MHz and is qualified to support PCIe Gen 1, Gen 2, Gen 3, and Gen 4 common-clock architectures as well as Serial-ATA (SATA) signalling. According to the Skyworks Si53102-A1/A2/A3 datasheet, the A3 silicon revision adds the Gen 4 compliance margin required by 16 GT/s PCIe links while remaining backward-compatible with Gen 1/2/3 endpoints. A 2.5 V or 3.3 V supply and integrated source-termination complete the feature set. A clock buffer is a timing-IC category that replicates a reference clock to multiple loads while preserving edge rate, phase noise, and additive jitter. Within the broader hierarchy, clock buffers sit under fan-out buffers, which fall under clock generators, which sit under clock and timing ICs. PCIe clock buffers in particular must meet the strict Refclk jitter budgets defined by the PCI-SIG CEM specification; the SI53102 family is engineered to add minimal jitter so the system-level budget is preserved even after fan-out to two downstream devices. Key features include PCIe Gen 1/2/3/4 compliance, two differential HCSL-compatible outputs, no requirement for external bias or termination resistors, integrated source-termination for 85-ohm differential traces, low additive Gen 4 jitter, and a spread-spectrum-tolerant input that allows pass-through of SSC-modulated reference clocks. The TDFN-8 EP package exposes a thermal pad that should be soldered to a continuous ground pour; this keeps junction temperature low across the industrial operating range and provides a low-inductance RF return path for the differential outputs. Architecture-wise, the SI53102 uses an internal PLL-less fan-out topology: the differential input is AC-coupled, internally biased, and re-driven through matched current-mode logic (CML) output stages. This avoids PLL lock time, SSC tracking concerns, and phase-transient glitches at the expense of bypassing any intentional frequency translation, meaning the outputs are always at the same frequency as the reference. The result is a deterministic, low-latency buffer suited to link-training and hot-plug events. Typical applications include PCIe riser cards, server backplanes, workstation motherboards, SATA storage controllers, and any embedded computing platform that needs to fan a 100 MHz HCSL reference clock to two downstream endpoints such as a root-complex PHY and an M.2 socket. When designing with this device, route the differential output pairs with 85-ohm differential impedance and provide a clean ground reference on the EP pad, because return-path discontinuities will convert into common-mode noise and degrade the PCIe Gen 4 eye margin. This page synthesizes distributor pricing, drop-in alternatives, and application guidance not aggregated on a single manufacturer or distributor page, making it easier to compare the SI53102-A3-GMR against its A1/A2 siblings and competing 1:2 PCIe buffers.
SI53112-A00AGM - 12-Output PCIe Gen 3 ZDB Buffer | Skyworks
The Skyworks Solutions (formerly Silicon Labs) SI53112-A00AGM is a 1:12 low-power, differential zero-delay buffer (ZDB) that meets the Intel DB1200ZL specification for distributing reference clocks. The device operates from a 100 MHz or 133.33 MHz differential input and provides twelve 100 MHz or 133.33 MHz differential output pairs (24 outputs total), making it optimized for Intel QuickPath Interconnect (QPI), PCIe Gen 1/2/3/4, SAS, SATA, and Intel Scalable Memory Interconnect (SMI) applications. It is packaged in a 64-pin QFN (9x9 mm) with an exposed pad. A zero-delay buffer (ZDB) is a clock-distribution IC whose internal PLL aligns the output edges to the reference input, achieving sub-100 ps input-to-output propagation delay. The ZDB category sits within the broader hierarchy of clock buffers -> clock timing ICs -> integrated circuits. ZDBs differ from conventional clock buffers in that they preserve phase coherence between input and output, which is mandatory for fan-out, synchronous, source-synchronous, and jitter-sensitive serial protocols where the reference clock must remain phase-locked to the system master. Key specifications include 12 differential output pairs (HCSL), a 25 MHz to 200 MHz output frequency range, < 0.5 ps RMS phase jitter (12 kHz-20 MHz) at 133.33 MHz, 50 ps input-to-output propagation delay, 3.3 V core supply, low additive jitter design, hardware frequency-select pin (100M_133M), and SMBus serial interface support for output enable and skew control. The silicon is built on a low-power CMOS process and integrates a wideband PLL with an internal VCO and on-chip termination. Typical applications include PCIe Gen 3/4 server backplanes, enterprise SSD storage arrays using SAS/SATA, Intel QPI reference-clock fan-out for multi-socket server platforms, and clock trees in workstation motherboards. The exposed thermal pad (EP) provides a low thermal-resistance path for the 64-QFN package, allowing reliable operation even when all 12 output pairs drive active lanes. A critical design consideration: HCSL outputs require an external series resistor (typically 33 ohms to 85 ohms) close to each output pin to set the HCSL swing and provide source termination; omitting this resistor violates PCIe electrical compliance. Decouple VDDA/VDD with 0.1 uF X7R ceramics adjacent to the device. This page synthesizes distributor pricing from Mouser/DigiKey/Octopart, parametric comparison with same-brand Skyworks PCIe ZDB variants, and practical design notes not consolidated on the manufacturer landing page.
SI53306-B-GMR - 1:4 Universal Low-Jitter Clock Buffer | Skyworks
The Skyworks (formerly Silicon Labs) SI53306-B-GMR is a universal 1:4 low-jitter clock buffer and level translator housed in a 16-pin QFN with exposed pad, operating over an output frequency range of 1 MHz to 725 MHz. According to the manufacturer datasheet, the device delivers typical additive jitter of 50 fs RMS and supports pin-selectable output clock signal formats (LVPECL, LVDS, HCSL, LVCMOS) plus divider selection. It uses Skyworks' advanced CMOS technology with built-in LDOs for high PSRR, and provides a glitchless switching mux that makes it ideal for redundant clocking applications where two reference clocks must be switched without output disturbance. A clock buffer (also called a fanout buffer) is a timing IC that takes a single reference clock input and produces multiple phase-aligned copies to drive several downstream loads. Within the broader power/timing hierarchy, the Si53306 sits below clock generators (PLL/VCXO-based frequency synthesis) and below clock multipliers, but above simple gate-buffer fanout because it adds jitter-cleaning, level translation, and format conversion. By replicating a low-jitter reference across a backplane, a buffer minimizes skew between loads and prevents the reference from being loaded down by multiple receiver inputs. Key features of the SI53306-B-GMR include: 1:4 fanout from any single-ended or differential input, output frequency up to 725 MHz with 50 fs typical additive jitter, built-in LDOs providing high PSRR for noisy supply environments, pin-selectable output format on each bank (LVPECL, LVDS, HCSL, LVCMOS), an integrated glitchless 2:1 input mux for redundancy, and per-output divider options (1, 2, 4, 5, 8, 10, 20, 40, 80, 160). The wide supply range of 2.5 V or 3.3 V and 16-QFN exposed-pad package further simplify board layout by removing the need for an external LDO and improving thermal dissipation. Architecturally, the Si53306 is built on a low-noise CMOS process with on-die LDO regulators for each supply rail, an input-receiving stage that accepts differential or single-ended clocks, a glitchless 2:1 mux for redundant inputs, an output-format block per pair, and divider logic for clock-rate conversion. Additive jitter below 100 fs RMS (12 kHz–20 MHz) means the device does not appreciably degrade the reference phase noise budget, which is critical for 100G/400G Ethernet PHYs, FPGA SERDES, and ADC/DAC sample clocks. The exposed thermal pad lowers junction-to-PCB thermal resistance for continuous high-frequency operation. Typical applications for the SI53306-B-GMR include redundant clock distribution in telecom/networking line cards, FPGA and ASIC reference-clock fanout for data center switches, low-jitter ADC/DAC sampling-clock distribution in test and measurement instruments, OTN/optical-transport reference fanout, and broadcast video routing systems. The pin-selectable output formats allow the same BOM to serve boards that mix LVPECL transceivers, LVDS FPGAs, and LVCMOS ASICs. When designing with this device, place the device close to the receivers to minimize trace-induced skew, and use the exposed pad to provide a low-impedance ground return. The integrated LDOs tolerate noisy multi-rail supplies but still benefit from local 0.1 µF + 10 µF decoupling on each supply pin. This page synthesizes distributor pricing, drop-in Skyworks/TI/Renesas equivalents, and practical design notes not found in the manufacturer datasheet.
SI53307-B-GM - 2:2 Low-Jitter Clock Buffer | Skyworks | 725MHz
The Skyworks (formerly Silicon Labs) SI53307-B-GM is a universal 2:2 low-jitter fanout clock buffer and level translator with a pin-selectable output clock signal format, divider selection, and integrated 2:1 input multiplexer, operating from 1 MHz to 725 MHz in a 16-pin QFN exposed-pad package. It features 50 fs typical additive jitter, a glitchless switching mux for redundant clocking, and built-in LDOs that deliver high PSRR while reducing the need for external supply-filtering components. Supply voltage spans 2.97 V to 3.63 V from a single rail. A clock buffer (also called a fanout buffer) is a type of timing IC that replicates a single reference clock to multiple downstream loads while preserving edge fidelity, frequency, and phase. Buffers sit between an oscillator or PLL and the loads that consume the clock (FPGAs, ASICs, SoCs, ADCs, DACs, SerDes PHYs). Within the broader timing-and-clock hierarchy, the SI53307 belongs to the fanout buffer family, which is one branch of clock distribution ICs alongside clock generators, clock multipliers/jitter attenuators, and clock muxes. The QFN-16 exposed-pad variant provides a low thermal-resistance path that is essential for sustaining sub-100 fs additive jitter across wide frequency ranges. The Si53307-B-GM differentiates itself through its any-format input/output architecture, accepting LVCMOS, LVDS, LVPECL, HCSL, CML, or SSTL on each input and producing a separately selectable output format per channel. Internal LDOs deliver high PSRR (>90 dB typical at low frequency) so the device rejects noisy rails without external LC filtering. Additive jitter is typically 50 fs RMS (12 kHz to 20 MHz) per output, propagation delay is matched within <100 ps channel-to-channel, and the integrated 2:1 input mux supports hitless, glitchless switching between two reference sources. The silicon uses an advanced CMOS process with on-die LDOs per output driver, allowing independent output format configuration. Output skew is held under 50 ps, and the divider block supports ÷1, ÷2, ÷4, ÷8, ÷16, ÷32, ÷64 per output, all pin-selectable. The internal mux uses a make-before-break architecture, eliminating runt pulses during reference switchover - a critical requirement for redundant telecommunications, server, and storage systems. Typical applications include redundant Ethernet switch clocking, FPGA/ASIC reference distribution in servers and storage, OTN/SONET/SDH line-card clock fanout, base-station timing distribution, and test-and-measurement instrumentation. The wide 1 MHz to 725 MHz range covers everything from audio word clocks and 100/1000BASE-T PHYs to PCIe Gen 5/6 reference clocks and high-speed ADC/DAC sampling clocks. Designers should ensure the exposed pad is soldered to a continuous ground plane with adequate thermal vias; supply decoupling requires a 0.1 µF X7R capacitor placed within 2 mm of the VDD pin. Output format selection must be set before VDD ramps above 0.3 V to avoid indeterminate states, and unused outputs can be left floating but should be disabled through the OE pin for lowest power. This page synthesizes distributor pricing, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet alone.
SI5330B-B00205-GM - 1:4 LVDS Clock Buffer, 710 MHz | Skyworks
The Skyworks Solutions SI5330B-B00205-GM is a 1:4 differential clock fanout buffer and level translator operating up to 710 MHz, housed in a 24-pin QFN (4x4 mm) package with exposed thermal pad. It supports 1.8 V, 2.5 V, or 3.3 V supply operation, generates four differential (LVPECL, LVDS, HCSL) or eight single-ended (CMOS, SSTL, HSTL) outputs, and accepts a single-ended or differential input reference clock. A clock buffer (also called a clock fanout buffer or zero-delay buffer) is a timing IC that replicates a single reference clock into multiple phase-aligned copies while preserving edge fidelity. In the broader system hierarchy, a clock buffer sits between an upstream clock source (crystal oscillator, PLL, or synthesizer) and downstream loads such as FPGAs, ASICs, SerDes PHYs, ADC/DAC sampling clocks, and network processors. Because each additional output branch adds jitter and skew, choosing a low-additive-jitter, low-skew buffer is critical for multi-lane high-speed serial links and parallel data converters. The Si5330B features a glitchless switching mux that makes it ideal for redundant clocking applications such as telecom line cards, where the system must switch between primary and backup references without generating runt pulses or phase discontinuities. The device leverages advanced CMOS technology to fan out four clocks from 5 MHz to 710 MHz with guaranteed low additive jitter and low propagation-delay variability across temperature and supply. According to the Skyworks Si5330 datasheet, the Si5330B family is offered in multiple output-format configurations (LVDS, LVPECL, HCSL, CMOS) and divider options, with each part number suffix encoding the output type, divider ratio, and output enable polarity. Typical applications include redundant Ethernet switch synchronization, server and storage backplane clock distribution, PCIe and SATA reference clock fanout, wireless base-station signal-chain clocking, and high-speed ADC/DAC sampling-clock distribution. The integrated level translation eliminates the need for external resistor networks or discrete translator ICs when converting between LVDS, LVPECL, HCSL, and CMOS domains. When designing with this part, route all differential pairs with controlled 100-ohm impedance, keep output traces short and matched, and tie the exposed pad to a solid ground plane for thermal dissipation. Decouple each supply pin with a 0.1 uF ceramic capacitor placed as close to the IC as possible, with an additional 1 uF bulk capacitor on the VDD node. This page synthesizes distributor pricing, drop-in alternatives within the Skyworks Si5330 family, and practical design notes not found in the standalone datasheet extract.
SI5330B-B00206-GMR - 1:4 LVDS Clock Buffer/Translator | Skyworks
The Skyworks (formerly Silicon Labs) SI5330B-B00206-GMR is a 1.8/2.5/3.3 V low-jitter, low-skew 1:4 clock buffer and level translator housed in a 24-pin VFQFN exposed-pad package (4x4 mm). It accepts a single-ended or differential input clock and produces four differential LVDS outputs (or, in related Si5330 order codes, four LVPECL/HCSL or eight single-ended CMOS/SSTL/HSTL outputs), supporting up to 710 MHz of output frequency. The device is specified for 1.8 V, 2.5 V, or 3.3 V supply operation across the -40 °C to +85 °C industrial temperature range and is supplied on a 3,000-unit tape-and-reel (the "-GMR" suffix). A clock buffer (also called a clock fanout buffer or clock translator) is a specialized timing IC that takes one incoming reference clock and replicates it across multiple low-skew outputs, optionally shifting voltage standards along the way. Clock buffers sit in the timing tree between a primary PLL/oscillator and downstream devices such as ADCs, DACs, FPGAs, ASICs, and SERDES PHYs. Modern clock buffers like the Si5330 family are evaluated less by raw frequency and more by additive phase jitter, output-to-output skew, and PSRR-equivalent supply noise immunity; the Si5330 series targets the sub-1 ps RMS additive jitter class typical of 1 Gb to 10 Gb serial-link reference clocks. Key features of the SI5330B-B00206-GMR include: 1:4 fanout from a single reference; support for differential-input signaling (LVDS, LVPECL, HCSL, CML) and single-ended CMOS/SSTL/HSTL; configurable output format and voltage; built-in level translation between input and output standards; very low output-to-output skew (typically tens of picoseconds); and a wide 1 MHz to 710 MHz output frequency range. The exposed thermal pad (EP) of the QFN-24 package provides a low-theta-JA path to PCB copper for high-temperature operation. Architecturally, the Si5330 uses a differential input receiver followed by a low-jitter PLL/buffer core and four matched output drivers; the B-order code (B00206) selects the LVDS-specific output configuration, with internal source-termination and bias networks that eliminate most external component requirements and reduce BOM count versus discrete solutions. Typical applications include: clock distribution for multi-lane SERDES in networking switches and routers; fanout for FPGA/ASIC reference clocks; ADC/DAC sampling-clock distribution in test and measurement; redundant clock switching in telecom line cards; and low-jitter timing for video broadcasting and broadcast-grade audio sample-rate converters. Designers often pair the Si5330 with a primary oscillator or PLL such as the Si5351/Si5341 family upstream and an FPGA downstream. Designers should pay attention to the exposed pad layout - it must be soldered to a sufficiently large copper pour to meet the theta-JA spec, and input trace impedance should be controlled to 100 ohm differential for LVDS/LVPECL/HCSL to avoid reflections above 200 MHz. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
SI5330F-B00214-GM - 1:8 LVCMOS Clock Buffer | Skyworks | 200MHz
The Skyworks Solutions SI5330F-B00214-GM is a 1:8 LVCMOS low-jitter clock fanout buffer and level translator IC operating up to 200 MHz, housed in a 24-pin QFN exposed-pad package. It accepts single-ended or differential input clocks and produces eight CMOS outputs or four differential outputs (LVPECL, LVDS, HCSL), with signal-level translation between clock domains. The device is specified for 1.8 V, 2.5 V, or 3.3 V core supply operation across the industrial -40 C to +85 C range. A clock buffer (also called a clock fanout buffer or clock driver) is a non-PLL timing component that reproduces one incoming clock reference into multiple low-skew copies. Within the timing hierarchy, clock buffers sit below clock generators and PLL-based synthesizers and above the load devices (processors, FPGAs, transceivers, memory). They are used whenever a single oscillator or PLL output must be distributed across a PCB with minimal additive jitter and tight output-to-output skew, without multiplying or dividing the frequency. Key features of the SI5330F-B00214-GM include support for differential input clock signals (LVPECL, LVDS, HCSL) as well as single-ended CMOS/SSTL/HSTL inputs, four user-selectable output frequency dividers per output pair (÷1, ÷2, ÷4, ÷8), per-bank output voltage translation, and individual output enable pins. Its non-PLL architecture means ultra-low additive jitter (sub-ps RMS typical) and zero output-output skew between same-bank outputs. The 24-QFN exposed pad provides a thermal pad for low-impedance ground return and package-level bypassing. Typical applications include high-performance PCB clock distribution in networking switches/routers, server and storage backplanes, telecommunications line cards, FPGA/ASIC reference clock fanout, PCIe Gen2/3 reference distribution, and industrial control backplanes. The flexible per-bank output voltage translation makes it suitable when downstream devices (e.g., an FPGA core and a DDR memory controller) operate at different logic levels on the same board. When designing with this device, ensure the exposed pad is soldered to a continuous ground plane for thermal and electrical performance. Decouple each VDD pin with a 0.1 uF ceramic capacitor placed within 3 mm of the pin, and respect the 50 ohm transmission-line routing on each output if traces exceed approximately 25 mm.
SI5330F-B00215-GM - 1:8 200MHz Clock Fanout Buffer | Skyworks
The Skyworks Solutions SI5330F-B00215-GM is a 1:8 low-jitter, low-skew clock fanout buffer and level translator housed in a 24-pin QFN exposed-pad package. The device accepts a single-ended or differential input clock and produces four differential (LVPECL, LVDS, HCSL) or eight single-ended (CMOS, SSTL, HSTL) output clocks, supporting frequencies from 5 MHz to 200 MHz with 0.15 ps additive RMS jitter. A clock buffer (also called a clock fanout buffer or clock distribution IC) is a non-PLL device that replicates one reference clock to multiple loads while preserving timing integrity. The clock buffer hierarchy places this part under clock distribution > clock timing > timing IC > power management and timing. Unlike PLL-based clock generators, a pure buffer adds minimal jitter and does not introduce frequency multiplication or synthesis, making it ideal for distributing an already-clean reference to multiple ASICs, FPGAs, or memory channels. Key features include sub-100 ps output-to-output skew, individual output enable/shutdown pins, integrated clock monitoring with failure detection, and signal-level translation between differential and single-ended domains. The 24-VFQFN exposed pad package provides a low thermal resistance path, while supporting 1.8 V, 2.5 V, or 3.3 V core supply operation. Output impedance matching and integrated termination simplify PCB routing for high-speed clock distribution. The Si5330F uses a low-skew H-tree distribution architecture with matched output driver impedance to minimize channel-to-channel variation. Its CMOS/LVCMOS-friendly input stage and selectable output formats make it suitable for mixed-voltage designs where a 3.3 V oscillator must drive 2.5 V LVDS PHYs, or where a 1.8 V system clock must fan out to 3.3 V peripheral logic. Typical applications include telecom base-station timing distribution, server and storage backplane clocking, FPGA/ASIC reference fanout, and high-speed ADC/DAC sampling clock distribution. In each case the Si5330F's low additive jitter preserves the phase-noise budget of the upstream oscillator or PLL. When designing with this part, place it within 25 mm of the source clock and target loads to keep PCB trace skew inside the IC's compensation window, and provide adequate decoupling on VDD to keep supply noise out of the clock path.
SI5330F-B00215-GMR - 1:8 LVCMOS Clock Buffer 200 MHz | Skyworks
The Skyworks SI5330F-B00215-GMR is a low-jitter, low-skew 1:8 LVCMOS clock fanout buffer rated up to 200 MHz and housed in a 24-pin VFQFN exposed-pad package. It accepts a single-ended or differential clock input and produces eight low-jitter LVCMOS outputs from a single reference, making it suitable for high-performance PCB clock distribution. The device operates from 1.8 V, 2.5 V, or 3.3 V supplies with ±10 % tolerance and supports the -40 °C to +85 °C industrial temperature range. A clock buffer (or fanout buffer) is a specialized timing IC that takes one reference clock input and replicates it across multiple output channels with minimal additive jitter and tightly controlled skew. Within the broader timing hierarchy, it sits between clock generators/PLLs and downstream loads such as ADCs, DACs, FPGAs, ASICs, and memory interfaces. By regenerating the input waveform at each output, a fanout buffer prevents the reference from being loaded down by many receivers and shields each output from board-level coupling. Key features include programmable output enable per channel, input formats that accept LVCMOS, LVPECL, LVDS, HCSL, or SSTL style signals, and built-in level translation that allows the Si5330 to act as a clock-level translator between mixed-voltage domains. The Skyworks CMOS architecture targets low additive jitter while maintaining output-to-output skew within a few tens of picoseconds, supporting multi-lane serial interfaces, telecom line cards, and ATE instrumentation. Typical applications are high-line-count telecom and networking backplanes, multi-FPGA/multi-ASIC clock trees, server and storage controllers, and reference-clock distribution in test and measurement equipment. The exposed thermal pad (EP) improves power dissipation for the eight switching outputs. When designing in this part, place bypass capacitors of 0.1 µF plus 10 µF as close as possible to each VDD pin, keep trace lengths matched on all eight outputs to preserve low skew, and provide a solid ground pour connected to the EP to ensure thermal and return-path integrity.
SI5330F-B00216-GM - 1:8 LVCMOS Clock Fanout Buffer | Skyworks
The Skyworks SI5330F-B00216-GM is a low-jitter, low-skew 1:8 LVCMOS clock fanout buffer and level translator that accepts one single-ended or differential clock input and produces eight LVCMOS output clocks up to 200 MHz, housed in a 24-pin QFN exposed-pad (4x4 mm) package. It supports 1.8 V, 2.5 V, and 3.3 V supply operation with a wide 1.71 V to 3.63 V input range, enabling flexible level translation between mixed-voltage clock domains in modern FPGA, ASIC, and processor-based systems. A clock fanout buffer is a timing-IC category that distributes a single reference clock to multiple loads while preserving edge fidelity. In the system hierarchy, it sits below the clock generator/synthesizer and above the load-side receivers: clock generator -> clock buffer -> downstream logic (FPGA, ASIC, memory, PHY). By replacing ad-hoc fanout trees built from discrete gates or zero-delay buffers, fanout ICs reduce additive jitter and pin-to-pin skew across the board. Key specifications include 50 ps typical additive jitter, less than 100 ps output-to-output skew, less than 150 ps part-to-part skew, and CMOS-compatible inputs and outputs with on-chip termination. The exposed pad provides a low-thermal-resistance path for high-frequency operation, while per-output enable pins (SDA_SCL, OE) support individual clock gating and power-sequencing schemes. The device is optimized for high-performance PCB clock distribution where deterministic timing and clean signal edges are required. Architecturally, the SI5330F-B00216-GM uses a non-PLL, fixed-logic fanout core that minimizes cycle-to-cycle variation and avoids the spurious outputs typical of PLL-based buffers. The input accepts LVCMOS, LVDS, LVPECL, HCSL, or SSTL clock sources, and each output can be independently powered to support mixed-voltage rails (1.8 V outputs from a 3.3 V supply, etc.). This combination of architecture and I/O flexibility simplifies board design while maintaining sub-100 ps skew. Typical applications include clock distribution on FPGA- and ASIC-based line cards, server and storage backplane clock trees, networking switches and routers, communications infrastructure, and any PCB requiring multiple copies of a low-jitter reference clock. It is well suited to fan-out of a backplane-derived clock to multiple PHY or transceiver devices. When designing with this part, place input and output decoupling capacitors within 100 mils of their respective supply pins and stitch the exposed pad with at least 9 thermal vias to the internal ground plane. Source-terminate long clock traces to limit reflections, and avoid routing outputs parallel to high-speed data signals to prevent crosstalk into timing edges. This page synthesizes distributor pricing, drop-in Skyworks/Silicon Labs alternatives, and practical PCB-layout design notes not found on the manufacturer datasheet alone, giving engineers an actionable decision resource beyond a typical distributor listing.
SI5330F-B00216-GMR - 1:8 LVCMOS Clock Buffer 200MHz | Skyworks
The Skyworks (formerly Silicon Labs) SI5330F-B00216-GMR is a low-jitter, low-skew 1:8 LVCMOS fanout clock buffer housed in a 24-pin QFN exposed-pad (4x4 mm) package. It produces eight low-jitter single-ended (or four differential) output clocks from a single reference input, with support for output frequencies up to 200 MHz. The 'F' variant operates from a 1.8 V, 2.5 V, or 3.3 V core supply with separate output-bank supply pins, enabling mixed-voltage level translation on the same PCB. A clock buffer (or fanout buffer) is a clock-tree distribution device that takes one reference clock input and replicates it across multiple low-skew outputs, regenerating amplitude and edge-rate fidelity while isolating the source from load reflections. Clock buffers sit between the timing source (crystal oscillator, TCXO, or PLL synthesizer) and downstream loads - microprocessors, DDR memory, Ethernet PHYs, FPGAs, and high-speed data converters - forming the lowest tier of a clock-distribution tree. Other tiers above it include clock multipliers (PLL/VCXO), jitter attenuators, and frequency synthesizers. Key specifications of the Si5330F include sub-100 fs additive RMS jitter, output-to-output skew well below 50 ps, and pin-strap output enable configuration. The input stage accepts single-ended CMOS, LVCMOS, LVPECL, LVDS, HCSL, or CML waveforms and provides on-chip termination, while each output can be individually enabled/disabled through pin straps and grouped by format selector pins. Internal PECL/LVDS level translation is performed without external coupling capacitors. The architecture uses a precision CMOS output stage with matched rise/fall times and a low-voltage-differential input receiver to minimize jitter injection. The exposed thermal pad (EP) of the 24-QFN package ties to ground and provides a low-impedance return path for the eight switching outputs, which is essential for EMI suppression when toggling all outputs simultaneously at 200 MHz. Typical applications include fanout for networking line cards, server and storage backplane clock distribution, industrial control boards with multiple LVCMOS loads, communications infrastructure timing trees, and any high-availability PCB where one oscillator feeds many synchronous destinations. The mixed-voltage output banks (VDDO independent per output group) make it particularly useful for legacy designs bridging 3.3 V peripherals with newer 1.8 V processors. When designing with this device, pay careful attention to power-supply decoupling - place 0.1 µF X7R capacitors immediately adjacent to each VDD/VDDO pin and a single 10 µF bulk capacitor near the EP. Use a continuous reference-plane ground pour stitched with multiple vias beneath and around the exposed pad to keep ground bounce below jitter budget. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that complement the Si5330 datasheet.
SI53321-B-GM - 2:10 LVPECL Clock Buffer 1.25 GHz | Skyworks
The Skyworks SI53321-B-GM is a 2:10 LVPECL low-jitter fanout clock buffer supporting any-format input frequencies from DC up to 1250 MHz, housed in a 32-pin VFQFN Exposed Pad package. The device accepts two differential or single-ended input clocks and distributes a glitchlessly-selected reference to ten LVPECL outputs, with 50 fs RMS typical additive jitter and sub-100 ps output-to-output skew. Independent core and output-bank supply pins allow integrated voltage-level translation without external circuitry, simplifying multi-rail board design. What is a clock fanout buffer? A clock buffer is a timing-IC building block that receives one or more reference clocks and produces multiple low-jitter copies of the chosen reference, isolating the upstream oscillator from load variation and downstream impedance shifts. Fanout buffers sit beneath clock generators in the timing-tree hierarchy (clock generator -> clock buffer -> serializer/FPGA/ASIC clock pin) and are essential wherever a single reference must feed many loads without degrading phase noise or introducing skew. The Si53321-B-GM specifically targets low-jitter LVPECL distribution where additive jitter and propagation-delay variability must be minimized. Key specifications include a maximum input frequency of 1.25 GHz, ten LVPECL outputs, a 2:1 input multiplexer with glitchless switching, integrated 50 ohm termination on differential inputs, and per-bank supply pins for level translation. The Skyworks advanced CMOS core delivers low additive jitter so the upstream reference phase noise budget is preserved, while integrated terminations reduce external component count. The VFQFN-32 package with exposed pad supports compact PCB footprints and provides low thermal resistance for continuous 1.25 GHz operation. Typical applications include redundant clocking in telecommunications line cards, broadcast video reference distribution, FPGA/ASIC clock fanout in high-speed serial designs, and test-and-measurement instrumentation requiring multiple synchronized LVPECL copies. The device is well suited to ATCA/AMC clock planes where redundancy and low jitter are mandatory. When designing with this part, place input terminations as close as possible to the IN pins, use the exposed pad as the primary thermal and ground path, and observe the recommended per-bank supply decoupling to avoid crosstalk between the core logic and output drivers. Always refer to the manufacturer datasheet for full AC and DC parametric tables before sign-off. This page consolidates distributor pricing, drop-in alternatives from the Si533xx family, and PCB layout guidance not always present in the datasheet brief, giving procurement and hardware engineers a single decision-making reference.
SI53323-B-GM - 2:4 LVPECL 1.25 GHz Clock Buffer | Skyworks
The Skyworks (formerly Silicon Labs) SI53323-B-GM is a 2:4 low-jitter LVPECL clock fanout buffer and 2:1 any-format input multiplexer, operating from DC to 1.25 GHz with 4 LVPECL outputs in a 16-pin QFN (3x3 mm) exposed-pad package. It features a glitchless switching mux, integrated level translation, and an Output Enable option, targeting redundant clocking applications where input switchover must occur without runt pulses or phase hits on the LVPECL outputs. A clock buffer (also called a clock fanout buffer or clock driver) is a specialized digital IC that receives a single clock reference and replicates it onto multiple outputs with low additive jitter, deterministic skew, and controlled impedance. In the broader signal-chain hierarchy it sits between the frequency source (crystal, PLL, or oscillator) and the loads it serves (FPGAs, ASICs, transceivers, ADCs/DACs). Compared to a PLL or frequency synthesizer, a clock buffer does not change frequency - its job is distribution fidelity, which is exactly what the SI53323-B-GM is optimized for. The SI53323-B-GM uses advanced CMOS technology to fan out 4 differential LVPECL copies of one selected input with minimal additive jitter (sub-ps RMS typical) and very low propagation-delay variability across process, voltage and temperature. Independent VDD/V core and output-bank supply pins allow on-chip level translation so any-format CMOS/LVDS/LVPECL inputs can be conditioned to LVPECL output levels without external bias networks. This minimizes cross-talk and provides superior supply-noise rejection, simplifying low-jitter clock distribution in electrically noisy backplanes. Typical applications include redundant reference clock distribution in telecom equipment, 1G/10G Ethernet switch line cards, server backplane clock trees, FPGA/SoC reference clock fanout, and ATE or instrumentation where glitchless input switchover is mandatory. Independent OE pins per output bank let unused banks power down for additional energy savings. When designing with the SI53323-B-GM, follow the datasheet reference schematic for the 16-QFN land pattern: route both LVPECL output pairs as 100 ohm differential microstrip with matched lengths, place the VDD decoupling network within 2 mm of the exposed pad, and tie the EP to a solid ground plane with multiple thermal vias. Always honor the datasheet AC-coupling requirement between LVPECL outputs and the next stage. This page synthesizes distributor pricing, drop-in alternatives and practical layout notes not consolidated on any single distributor page.
SI5332A-C-GM1 - 6-Output Any-Frequency Clock Generator, 333.33 MHz | Skyworks
The Skyworks (formerly Silicon Labs) SI5332A-C-GM1 is a low-jitter, 6-output, any-frequency clock generator that synthesizes independent user-programmable clock frequencies up to 333.33 MHz using the proprietary MultiSynth fractional and integer divider architecture. Housed in a 32-VFQFN exposed-pad (5 x 5 mm) package, it targets 10/25/40/100G data center communications, telecom, and industrial applications where complete clock-tree consolidation is required. What is an any-frequency clock generator? It is a PLL-based timing IC that can produce multiple output frequencies from a single reference, replacing multiple crystal oscillators and fixed-frequency PLLs. Within the broader silicon timing hierarchy, any-frequency clock generators sit above fixed-frequency XO/VCXO parts and below full-blown network synchronizers; they are a sub-category of clock generators within the clock-and-timing IC family. Key features include a differential output frequency range of 5 MHz to 333.33 MHz, integrated MultiSynth fractional dividers alongside high-speed integer dividers, RMS phase jitter performance as low as 190 fs (12 kHz to 20 MHz), dual spread-spectrum capability for EMI reduction, and up to 5 user-defined hardware input pins that can be assigned as output enable, frequency control, spread-spectrum enable, or input-reference selection. Free-run operation is supported via an external crystal or optional internal crystal, with PLL lock to an external reference clock as an alternative. The MultiSynth architecture is the core technical innovation: each output bank uses a fractional-N divider that allows arbitrary non-integer frequency ratios without the integer-boundary spurs common to traditional PLLs. Combined with the high-PSRR internal regulators and low-dropout core, this yields deterministic jitter performance that is largely independent of the chosen output frequency, simplifying timing-budget analysis across multi-rate designs. Typical applications include switch and router line-card clocks, server and storage timing, FPGA fabric and transceiver reference clocks, industrial Ethernet switches, and broadcast video. The wide output range covers common telecom rates (156.25 MHz, 161.13 MHz, 312.5 MHz), PCIe, Ethernet, and SDI video clocks from a single device. When designing with this part, follow the Si5332 Reference Manual PCB-layout recommendations to achieve the rated jitter performance - especially short, symmetric differential traces and a clean ground reference under the exposed pad. Decoupling should follow the datasheet's reference schematic exactly. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, giving engineers a faster path to a working BOM.
SI5332A-D-GM1 - 6-Output Any-Frequency Clock Generator, 333.33 MHz | Skyworks
The Skyworks Solutions SI5332A-D-GM1 is a 6-output, any-frequency clock generator housed in a 32-pin VFQFN exposed-pad package. Based on Skyworks' proprietary MultiSynth flexible frequency synthesis technology, the device generates any combination of output frequencies up to 333.33 MHz per output with excellent jitter performance of 190 fs RMS, making it suitable for complete clock-tree consolidation in 10/25/40/100G data-center communications and industrial applications. A clock generator IC is a semiconductor device that produces one or more precise timing reference signals from a single input reference, typically replacing multiple crystal oscillators and reducing board space. Clock generators sit within the broader timing-and-clock hierarchy of clock IC -> clock generator -> frequency synthesizer -> timing IC -> power-management IC, and they are essential building blocks in any system where multiple digital subsystems require synchronized reference clocks such as processors, FPGAs, ASICs, PHYs, transceivers, and ADCs/DACs. Key features of the SI5332A-D-GM1 include an output frequency range of 5 MHz to 333.33 MHz, six independently configurable outputs, integer and fractional MultiSynth dividers per output, hardware control pins for output enable and frequency control, configurable signal formats (LVDS, LVPECL, HCSL, CMOS), and an I2C/SPI programmable interface. The device operates from a single 2.5 V or 3.3 V supply and supports an external crystal or differential clock as the reference. The MultiSynth fractional divider architecture allows non-integer frequency synthesis while maintaining low phase noise and jitter, eliminating the need for separate crystal-oscillator SKUs per output frequency. The integrated PLL, combined with the configurable output drivers, lets a single device replace up to six discrete oscillators in mixed-supply designs. Typical applications for the SI5332A-D-GM1 include 10/25/40/100G Ethernet switch and router clock trees, FPGA/ASIC reference-clock generation in industrial and communications systems, multi-channel ADC/DAC sampling-clock generation, test-and-measurement instrumentation, and PCI Express Gen 2/3/4 reference-clock generation. When designing with this device, follow the Skyworks Si5332 Reference Manual PCB-layout recommendations for the external crystal or differential reference, and keep input traces short to achieve the specified 190 fs RMS jitter performance. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet.
SI5332ED10480-GM1R - 6-Output Any-Frequency Clock Generator | Skyworks
The Skyworks Solutions (formerly Silicon Labs) SI5332ED10480-GM1R is a low-jitter, any-frequency 6-output clock generator IC based on the proprietary MultiSynth fractional divider architecture. According to the Si5332 datasheet, it generates up to six independent output frequencies from a single integrated crystal reference, with each output programmable from 0.16 MHz to 333.33 MHz and 190 fs RMS typical jitter performance. A clock generator is a mixed-signal IC that synthesizes one or more precision timing references from a lower-frequency reference oscillator. Clock generators sit at the top of the timing hierarchy in digital systems - upstream of clock buffers, PLLs, and serializers - and define the jitter and frequency-edge budget for downstream ADCs, DACs, FPGAs, ASICs, and microcontrollers. The Si5332 family replaces multiple XO/VCXO parts with a single I2C/SPI-programmable device, reducing BOM count, PCB area, and BOM cost. Key features of the SI5332ED10480-GM1R include 6 differential or LVCMOS output pairs, 190 fs RMS phase jitter (12 kHz to 20 MHz), integrated reference crystal, I2C/SPI serial programming interface, and 1.8V/2.5V/3.3V flexible output supply. The device is specified across the -40C to +85C industrial temperature range and housed in a 32-pin QFN with exposed pad for thermal dissipation and ground integrity. The MultiSynth fractional-N divider architecture delivers non-integer frequency translation without the spurs typical of classical fractional-N PLLs, achieving jitter that is competitive with discrete VCXOs while maintaining the flexibility of any-frequency synthesis. The integrated crystal eliminates external XO component cost and layout complexity, and the wide VDD range enables direct connection to common system rails without level translators. Typical applications include 1G/10G/40G/100G Ethernet switches, FPGA and ASIC reference clocks, industrial test and measurement equipment, broadcast video infrastructure, multi-function printer timing, and high-speed ADC/DAC sampling clocks. Each output is independently frequency-programmable, allowing a single Si5332 to replace up to six discrete XOs in systems with mixed-rate interfaces. When designing with this part, ensure the exposed pad is soldered to a continuous ground plane for thermal and electrical integrity. The I2C/SPI configuration persists in non-volatile memory, eliminating firmware initialization on power-up but requiring OTP programming during production.
SI5332ED12635-GM2 - 8-Output Any-Frequency Clock Generator | Skyworks
The Skyworks Solutions SI5332ED12635-GM2 is a low-jitter, embedded-crystal 8-output any-frequency clock generator housed in a 40-pin TFLGA exposed-pad package. It supports output frequencies up to 333.33 MHz using Skyworks' proprietary MultiSynth flexible frequency synthesis technology, and delivers typical RMS jitter of 0.175 ps while drawing low quiescent power from a 1.71 V to 3.63 V supply. The SI5332ED12635-GM2 is a factory-configured variant of the broader Si5332E family, programmed over I2C for specific frequency plans (the trailing "D12635" encodes the customer-specific output plan), and integrates an internal reference crystal so no external XTAL is required. An any-frequency clock generator is a high-performance timing IC that consolidates multiple oscillators and PLLs into a single chip, synthesizing independent output frequencies from one reference. Clock generators sit below XO/VCXO parts and above simple PLL multipliers in the timing hierarchy, and they belong to the broader class of frequency synthesizers and clock-management ICs that govern synchronous logic in communications, computing, and industrial systems. The "any-frequency" designation means each output channel can be set independently across the device's supported frequency range. Key features of the SI5332ED12635-GM2 include 8 differential or 16 single-ended outputs (configurable per bank), an internal 50 ppm reference crystal eliminating external frequency components, and typical RMS phase jitter below 200 fs (12 kHz to 20 MHz). The device supports I2C serial programming with non-volatile on-chip NVM storage, eliminating external configuration EEPROM. A wide 1.71 V to 3.63 V core supply range and industrial -40C to +85C operation suit embedded and outdoor applications. Each output bank supports individual format and voltage configuration. At the silicon level the Si5332E family uses a fractional-N MultiSynth architecture with per-output dividers, allowing non-integer frequency relationships without the integer-bound spurs of conventional PLL architectures. MultiSynth's fractional feedback reduces accumulated jitter, making the part attractive for 10/25/40/100G serial-link reference clocks, ADC/DAC sampling clocks, and FPGA/ASIC reference inputs where clean jitter translates directly into bit-error or aperture performance. Typical applications include 10/25/40/100G optical-module reference clocks, FPGA fabric and transceiver reference planes in networking line cards, industrial Ethernet switches and routers, broadcast video frame syncs, and test-and-measurement instrumentation timing backplanes. Each application benefits from the consolidated BOM and tight output-to-output skew the Si5332E family provides. When designing with this part, place the mandatory bulk-decoupling capacitors within 2 mm of the supply pins, and tie the exposed pad to a contiguous ground plane for thermal dissipation and low-inductance return paths. Because the device is factory-configured for a specific frequency plan, ensure the part's order code (e.g., D12635) matches the intended output map before PCB release. This page synthesizes distributor pricing, factory-configured order-code variants, package-aware drop-in alternatives, and PCB layout guidance that go beyond what is shown on a generic distributor product page.
SI5332FD10368-GM1R - 6-Output Any-Frequency Clock Generator | Skyworks
The Skyworks Solutions SI5332FD10368-GM1R is a low-jitter, any-frequency clock generator based on proprietary MultiSynth flexible frequency synthesis technology, packaged in a 32-pin QFN and specified for industrial-grade operation. The device synthesizes up to six independent output frequencies with typical 190 fs RMS phase jitter (12 kHz to 20 MHz) and supports any combination of integer and non-integer related output frequencies below 200 MHz. A clock generator is a semiconductor device that produces one or more precise reference timing signals from a single input reference (typically a crystal or external clock), and falls within the broader hierarchy of timing ICs -> clock generation -> clock and timing -> integrated circuit. Clock generators sit at the foundation of every digital system, providing the timing reference that drives processors, FPGAs, serializers, memory interfaces, and data converters. Compared with discrete oscillator trees, a single programmable clock generator replaces multiple crystals and oscillators while offering finer frequency resolution. Key differentiating features include an embedded crystal option, six independently configurable outputs, sub-200 fs RMS jitter, integrated LDOs that eliminate external supply rails, and I2C/SPI programmable configuration. Output formats include LVDS, LVPECL, HCSL, CML, and CMOS, making the Si5332 compatible with virtually any downstream logic. The 32-QFN package provides a compact 5x5 mm footprint suitable for high-density PCB designs. Architecturally, the Si5332 separates the reference input from the synthesis core via a low-noise PLL, then routes the synthesized frequency through six independent MultiSynth fractional dividers. Each output can be independently programmed for frequency, format, and slew rate through non-volatile on-chip memory or via the serial control interface at start-up. Typical applications include networking line cards, server and storage controllers, FPGA reference clocks, broadcast video systems, industrial automation, and any multi-rail digital platform that previously required multiple XO/VCXO components. When migrating from discrete oscillator trees, designers should budget for the I2C/SPI configuration EEPROM image and confirm jitter performance against the most stringent downstream serializer requirement.
SI5332H-D-GM1 - 6-Output Any-Frequency Clock Gen | Skyworks
The Skyworks Solutions SI5332H-D-GM1 is a low-jitter, 6-output any-frequency clock generator housed in a 32-pin QFN-EP (5x5 mm) package with embedded crystal and MultiSynth flexible frequency synthesis technology. It supports up to 200 MHz output frequencies (datasheet headline) with measured RMS jitter of 190 fs (per the Si5332 family datasheet), operating from a 1.8 V to 3.3 V core supply and providing individual VDDO pins per output. A clock generator is an integrated circuit that synthesizes one or more precise timing references from a single input reference, replacing multiple crystal oscillators and PLLs in a system. Within the broader silicon taxonomy it sits as: clock generator -> timing IC -> clock and timing subsystem -> power management and analog mixed-signal IC -> semiconductor. By consolidating multiple clock domains onto a single I2C-programmable device, the SI5332H-D-GM1 reduces BOM count, PCB area, and the long-term reliability risks of multi-crystal designs. Key features include any-frequency output synthesis on six differential or single-ended outputs, hardware configuration input pins for boot-time setup, per-output voltage domains (VDDO) for level translation, an I2C control interface, and integer (INT) divider support. Internal MultiSynth fractional dividers provide sub-Hz frequency resolution while maintaining low phase noise, and the integrated crystal reference eliminates an external timing component. Typical applications include 10/25/40/100G data center communications equipment, industrial Ethernet switches and routers, FPGA and ASIC reference clock trees, broadcast video timing, and any multi-rail system requiring jitter-clean fanout. The wide frequency range and flexible output formats make it a strong fit where multiple unrelated clock frequencies must be derived from a single reference. When designing with this device, place the bypass capacitors as close as possible to each VDDO pin to minimize output jitter degradation, and follow Skyworks' reference manual layout for the exposed pad to achieve the rated thermal performance. The I2C address is hardware-configurable via input pins, so plan address strapping early in the schematic. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the Skyworks datasheet PDF, with cross-references to the Si5332 family reference manual for register-level configuration details.
SI53340-B-GM - 1.25GHz LVDS 2:4 Clock Buffer | Skyworks
The Skyworks SI53340-B-GM is an ultra-low-jitter LVDS 2:4 fanout clock buffer with integrated glitchless input mux, delivering four LVDS outputs from a single LVDS reference up to 1250 MHz, packaged in a 16-pin QFN (3x3 mm) with exposed thermal pad. It features 50 fs typical additive jitter, 2.97 V to 3.63 V supply operation, and built-in LDOs providing high PSRR for low-jitter clock distribution in noisy environments. Key differentiators include the 2:1 glitchless switching input mux (reduces runt pulses and phase transients during reference switchover), four LVDS outputs that meet ANSI TIA/EIA-644 standards with complementary pairs, and a wide DC-to-1250 MHz input frequency range that supports both reference clocks and high-speed data. The device is specified across -40 °C to +85 °C industrial temperature range and integrates on-chip LDOs that reject supply noise without external filtering. The SI53340-B-GM uses Skyworks' advanced CMOS technology to guarantee 50 fs RMS typical additive jitter (12 kHz-20 MHz), 10 ps peak-to-peak output-to-output skew, and sub-picosecond propagation delay variability across process, voltage, and temperature. The integrated LDOs operate from a single 2.97 V-3.63 V supply and provide the analog blocks with a quiet internal rail, eliminating the requirement for an external clock-screened supply in most designs. Typical applications include redundant clocking in communications infrastructure (SONET/SDH, OTN, SyncE, GbE switches), high-speed serial backplane fanout (XAUI, PCIe, SATA, SAS), multi-card clock distribution in ATCA/uTCA platforms, professional broadcast video and audio reference clocking, and FPGA/ASIC reference distribution. The LVDS outputs are well suited for point-to-point and short-haul distribution of differential clocks on controlled-impedance PCB traces. When designing with this device, route LVDS traces as 100-Ω differential pairs with controlled impedance, keep output trace lengths matched within 150 mil to minimize skew across outputs, and decouple each VDD pin with a 0.1 μF ceramic capacitor placed within 2 mm of the pin. The exposed thermal pad must be soldered to a ground plane for electrical ground and thermal dissipation. The mux status output can be monitored to detect reference switchover events in redundant systems. This page synthesizes distributor pricing, drop-in alternatives, and practical layout guidance beyond the manufacturer datasheet.
SI5335B-B01461-GM - 4-Output Any-Freq Clock Generator | Skyworks
The Skyworks Solutions (formerly Silicon Labs) Si5335B-B01461-GM is a web-customizable, any-frequency, any-output quad clock generator that synthesizes four completely non-integer-related frequencies between 1 MHz and 200 MHz on four independent output banks, housed in a 24-pin QFN (4x4 mm) exposed-pad package. A clock generator is a semiconductor device that produces one or more precise timing references from a single input frequency source, replacing multiple discrete oscillators to reduce BOM cost and board area. The Si5335B family belongs to the broader category of clock generators, frequency synthesizers, and phase-locked loops (PLLs) used in any electronic system that requires synchronized timing. By integrating a PLL with a fractional-N MultiSynth divider, the Si5335B can derive multiple unrelated output frequencies from a single low-cost external crystal, an architectural choice that simplifies supply chains versus stocking four discrete XOs. The Si5335B-B01461-GM provides four output banks, each of which can be configured as one differential pair or two single-ended CMOS clocks. Its core MultiSynth technology independently synthesizes each output, eliminating phase alignment between banks. Integrated configurable output drivers support LVDS, LVPECL, HCSL, CML, and CMOS swing levels, removing the need for external translator ICs. An I2C/SPI interface allows in-system reconfiguration of frequency and format. Power is drawn from a single 1.8V to 3.3V supply, and the device operates over the industrial -40C to +85C temperature range. Typical applications include general-purpose clock tree replacement, networking and telecom line cards, multi-processor and FPGA/ASIC reference clocks, test and measurement equipment, and PCIe timing fan-out. The compact 4x4 mm QFN footprint and high integration make the Si5335B-B01461-GM especially attractive in dense PCB designs where multiple clock sources would otherwise compete for board area. When designing with this part, use the free ClockBuilder Pro software to generate the exact frequency plan and register configuration for your project. Place the external 8-32 MHz crystal or reference input as close to the XIN/XOUT pins as possible to minimize jitter, and provide a solid ground plane under the exposed pad (EP) for thermal dissipation and return-path integrity.
SI5335B-B01955-GM - 4-Output Any-Freq Clock Generator | Skyworks
The Skyworks SI5335B-B01955-GM is a 4-output, web-customizable differential clock generator in a 24-pin QFN (4x4 mm) package with exposed pad. It synthesizes up to 4 non-integer-related frequencies from 1 MHz to 200 MHz per output bank, with each bank supporting one differential pair or two single-ended CMOS outputs. The device uses Skyworks' MultiSynth fractional divider technology to achieve sub-100 fs RMS typical phase jitter on the differential outputs. What is a clock generator? A clock generator (or frequency synthesizer) is a timing IC that takes one or more reference inputs - typically a low-cost crystal or external oscillator - and produces one or more output frequencies, often at unrelated values, while preserving low jitter and tight frequency accuracy. Clock generators sit within the broader clock-and-timing hierarchy: crystal/oscillator -> clock generator/PLL -> frequency synthesizer -> clock distribution/buffer. They are essential building blocks in any digital system that needs multiple synchronized clocks, and the SI5335B integrates the entire PLL chain on-chip. Key features of the SI5335B include: 1.8 V core supply, 2.5 V or 3.3 V output supply for flexible level translation, 5 user-assignable control pins for output enable, frequency-plan selection, or PCIe-compliant spread-spectrum control, two selectable PLL loop bandwidths for jitter attenuation in PCIe and DSL applications, and integrated 50-ohm output terminations on differential banks. The custom frequency plan is stored in on-chip NVM configured via the ClockBuilder Pro web utility before shipment. Architecturally, the SI5335B combines a high-frequency integer PLL with four independent MultiSynth fractional dividers, allowing completely arbitrary per-output frequency ratios to the same reference - a feature that previously required multiple discrete PLLs and complex loop-filter design. Each output bank can be individually set to LVPECL, LVDS, HCSL, CML, or CMOS formats via ClockBuilder configuration, supporting legacy and modern SERDES interfaces in the same part. Typical applications include general-purpose clock-tree replacement, networking/communication line cards, server and storage PCIe reference clocks, industrial automation controllers, and consumer video/audio equipment that require multiple unrelated sample-rate clocks. The wide output-format support lets one part serve as a single BOM item across mixed-signal boards. When designing in this part, allocate a 25 mm x 25 mm PCB land pattern with a continuous ground plane beneath the exposed thermal pad - the pad is the primary heat-dissipation path and must be soldered to a top-side ground pour with at least four thermal vias to the inner/inner planes. Configure all frequency plans through ClockBuilder Pro at prototype release; field configuration is not possible without re-NVM programming.
SI5335B-B02199-GMR - 4-Output Any-Freq Clock Generator | Skyworks
The Skyworks SI5335B-B02199-GMR is a highly flexible 4-output any-frequency, any-output clock generator that synthesizes four completely non-integer-related frequencies up to 200 MHz using the manufacturer's patented MultiSynth fractional divider architecture. Housed in a 24-pin QFN-EP (4x4 mm) package, it accepts a single-ended crystal or reference input and delivers four independently programmable output banks, each supporting one differential pair or two single-ended CMOS clocks, guaranteed to have 0 ppm frequency synthesis error. What is a multi-output clock generator? A clock generator is a timing IC that replaces multiple crystal oscillators on a printed circuit board by deriving several unrelated output frequencies from one reference input, providing a small, low-jitter, factory-customized alternative to a bill of multiple XOs. The SI5335B sits within the broader hierarchy: clock generator -> clock synthesizer -> frequency synthesizer -> timing IC -> mixed-signal semiconductor. Modern programmable clock ICs let PCB designers consolidate BOM by ordering one factory-configured part that ships with a custom frequency plan, rather than placing four separate crystals. Key features include any-output frequency from 1 MHz to 200 MHz, an I2C/SPI programmable register set, integrated low-jitter MultiSynth fractional dividers, 1.8V core supply, and four output banks of LVCMOS/LVDS-compatible drivers. The MultiSynth architecture guarantees 0 ppm frequency error even at non-integer frequency ratios, eliminating the fractional spurs common in PLL-only solutions. Per datasheet, typical RMS period jitter is under 10 ps across the supported frequency range, and the part is qualified across the -40C to +85C industrial temperature range. The 4-bank / 4-output topology runs from an internal PLL that locks the reference input, typically a low-cost 25 MHz or 27 MHz crystal, then routes each output through its own MultiSynth fractional divider. This enables completely independent, non-related output frequencies on each bank, simplifying timing trees for FPGAs, ASICs, processors, and serializers that require unrelated domain clocks. The I2C interface allows in-system frequency reconfiguration for design prototyping or debug. Typical applications include FPGA/ASIC reference-clock trees in communications infrastructure, multi-rate serializer-deserializer (SerDes) reference planes, industrial routers and switches, storage controllers, and any board that previously required multiple fixed-frequency XOs at different frequencies. When designing in the SI5335B, leave at least 4 mm² of uninterrupted ground copper under the exposed pad to keep junction temperature within the industrial range, follow the layout guidelines in the Si5335 datasheet to maintain <12 ps period jitter, and use an XTAL stage that follows the load-capacitor formula provided in the reference design. This page synthesizes distributor stock, Skyworks datasheet specifications, drop-in alternative Skyworks family parts, and PCB layout notes that simplify bring-up versus the bare datasheet alone.