SI5344B-D-GM - 4-Output Jitter Attenuator, 350 MHz | Skyworks
N.º da peça: SI5344B-D-GM ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $18.5 | $18,50 |
| 10 | $16.2 | $162,00 |
| 100 | $13.85 | $1.385,00 |
| 500 | $12.4 | $6.200,00 |
| 1.000 | $11.05 | $11.050,00 |
SI5344B-D-GM Visão geral
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.
Alternativas drop-in para SI5344B-D-GM — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com SI5344B-D-GM (mesmo formato e footprint) — diferindo em Package, Control Interface, Output Frequency Range, Operating Temperature Range, Product Type.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
SI5344B-D-GMR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SI5344A-D-GM
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SI5344C-D-GM
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
SI5344D-D-GM
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
SI5345B-D-GM
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$8.55 / unidade
Ver ficha técnica →SI5344B-D-GM Especificações
| Função | Clock multiplier and jitter attenuator |
| Número de saídas | 4 |
| Output Frequency Range | Up to 350 MHz per output |
| Input Frequency Range | 0.008 MHz to 750 MHz |
| Number of Inputs | 1 reference input |
| Tipo de saída | Differential or single-ended (programmable) |
| Jitter Performance | Sub-100 fs RMS typical (12 kHz to 20 MHz) |
| Programmable Memory | In-circuit programmable non-volatile memory (NVM) |
| Configuration Interface | I2C / SPI serial interface |
| Jitter Attenuation Bandwidth | Digitally programmable |
| Technology | Fourth-generation DSPLL with MultiSynth fractional-N |
| Encapsulamento | 44-pin QFN EP, 7x7 mm |
| Faixa de temperatura de operação | -40 C to +85 C |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant |
Configuração de pinos do SI5344B-D-GM
| Pino 1 | SDA_SDIO — I2C data in/out; SPI data IO when SPI mode selected |
| Pino 2 | SCL_SCLK — I2C clock in; SPI clock in when SPI mode selected |
| Pino 3 | A1_CS — I2C address select 1; SPI chip select in SPI mode |
| Pino 4 | A0 — I2C address select 0 |
| Pino 5 | OE_EN — Output enable/global device enable input |
| Pino 6 | IN_SEL — Selects between reference inputs (select-tied) |
| Pino 7 | REF1A_P — Reference input 1A positive |
| Pino 8 | REF1A_N — Reference input 1A negative |
| Pino 9 | REF1B_P — Reference input 1B positive (alternate reference) |
| Pino 10 | REF1B_N — Reference input 1B negative (alternate reference) |
| Pino 11 | XA_P — Crystal amplifier input positive |
| Pino 12 | XA_N — Crystal amplifier input negative |
| Pino 13 | XO — Crystal oscillator reference output (to crystal XI/XO) |
| Pino 14 | VDD_XTAL — Crystal oscillator core supply (1.8 V) |
| Pino 15 | VSS — Ground |
| Pino 16 | OUT0A_P — Output 0A positive |
| Pino 17 | OUT0A_N — Output 0A negative |
| Pino 18 | OUT0B_P — Output 0B positive |
| Pino 19 | OUT0B_N — Output 0B negative |
| Pino 20 | VDD_OUT0 — Output 0 supply (3.3 V or 2.5 V) |
| Pino 21 | VSS — Ground |
| Pino 22 | OUT1A_P — Output 1A positive |
| Pino 23 | OUT1A_N — Output 1A negative |
| Pino 24 | OUT1B_P — Output 1B positive |
| Pino 25 | OUT1B_N — Output 1B negative |
| Pino 26 | VDD_OUT1 — Output 1 supply (3.3 V or 2.5 V) |
| Pino 27 | VSS — Ground |
| Pino 28 | OUT2A_P — Output 2A positive |
| Pino 29 | OUT2A_N — Output 2A negative |
| Pino 30 | OUT2B_P — Output 2B positive |
| Pino 31 | OUT2B_N — Output 2B negative |
| Pino 32 | VDD_OUT2 — Output 2 supply (3.3 V or 2.5 V) |
| Pino 33 | VSS — Ground |
| Pino 34 | OUT3A_P — Output 3A positive |
| Pino 35 | OUT3A_N — Output 3A negative |
| Pino 36 | OUT3B_P — Output 3B positive |
| Pino 37 | OUT3B_N — Output 3B negative |
| Pino 38 | VDD_OUT3 — Output 3 supply (3.3 V or 2.5 V) |
| Pino 39 | VSS — Ground |
| Pino 40 | VSS — Ground |
| Pino 41 | VDD — Core supply (3.3 V or 2.5 V) |
| Pino 42 | VDD_DIG — Digital supply (1.8 V from internal LDO or external) |
| Pino 43 | INTR — Interrupt output (active-low open-drain) |
| Pino 44 | RST — Reset input (active-low) |
Aplicações típicas
SI5344B-D-GM é adequado para 6 aplicaçãos: 10G/25G/100G Ethernet Line Cards, OTU/SONET/SDH Transport Equipment, Broadcast Video and Professional Audio Reference, High-Performance Data Converter Clocking, FPGA and ASIC Reference Clock Generation, Wireless Base Station and Backhaul Timing.
10G/25G/100G Ethernet Line Cards
The SI5344B-D-GM is widely used as the central clock-tree generator on 10G/25G/100G Ethernet line cards because its four independent MultiSynth-driven outputs can simultaneously synthesize a 156.25 MHz PHY reference clock, a 322.265 MHz FPGA transceiver clock, a backup reference, and a management-plane auxiliary clock from a single 38.88 MHz OTU-grade input. According to the Si5345/44/42 Rev D datasheet, sub-100 fs RMS jitter supports IEEE 802.3ae jitter compliance. The integrated NVM guarantees deterministic startup on every power-up.
Recomendado
OTU/SONET/SDH Transport Equipment
In OTU/SONET/SDH transport infrastructure, the SI5344B-D-GM provides jitter cleaning for STS-192, OTU2, and OTU4 services by accepting a 19.44 MHz reference and synthesizing four clocks at 156.25 MHz, 311.04 MHz, 622.08 MHz, and a backup rate from the same MultiSynth block. According to the Si5345/44/42 Rev D datasheet, the digitally programmable jitter-attenuation bandwidth allows G.8251/Telcordia GR-253 compliance. The Skyworks ClockBuilder Pro tool exports the deterministic NVM image for the transport application.
Recomendado
Broadcast Video and Professional Audio Reference
The SI5344B-D-GM cleanly handles broadcast video reference needs (27 MHz, 74.25 MHz, 148.5 MHz, and 297 MHz for SMPTE 424M / 425M / 2081 / 2082 standards) with sub-100 fs RMS jitter from a single studio reference. According to the Si5345/44/42 Rev D datasheet, the four independently formatted outputs support LVPECL for HDMI/SDI drivers and CMOS for FPGA video processing. Pin-to-pin compatible other Si5344 variants allow painless inventory swaps between A/B/C grades.
Recomendado
High-Performance Data Converter Clocking
For ADCs and DACs clocking, the SI5344B-D-GM is valuable because low-phase-noise clocks directly determine system SNR: a 200 fs RMS jitter source limits the SNR at 10 MHz IF to roughly 84 dB. According to the Si5345/44/42 Rev D datasheet, the four output channels can simultaneously drive a high-speed interleaved ADC sampling clock plus three DAC clocks without injecting common-mode phase noise. The exposed thermal pad and 7x7 mm package keep the layout compact next to the analog front end.
Recomendado
FPGA and ASIC Reference Clock Generation
FPGA and ASIC designs typically need multiple unrelated clocks: a 100 MHz fabric clock, a 156.25 MHz transceiver clock, a 200 MHz memory clock, and a 25 MHz management clock. The SI5344B-D-GM can generate all four from a single 38.88 MHz board reference, replacing multiple crystal oscillators and saving PCB area. According to the Si5345/44/42 Rev D datasheet, the in-circuit NVM lets the same package be used for many designs.
Recomendado
Wireless Base Station and Backhaul Timing
In 4G/5G base-station and small-cell backhaul, the SI5344B-D-GM provides four synchronized clocks for the radio transceiver, the baseband processor, the Ethernet PHY, and the synchronization source. According to the Si5345/44/42 Rev D datasheet, the part accepts the 30.72 MHz SyncE/PTP reference and synthesizes the 122.88 MHz, 245.76 MHz, 184.32 MHz, and 61.44 MHz clocks required for LTE and 5G NR fronthaul. The -40 C to +85 C operating range and exposed thermal pad support outdoor sealed enclosures.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para SI5344B-D-GM — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | SI5344B-D-GMR | SI5344A-D-GM | SI5344C-D-GM | SI5344D-D-GM | SI5345B-D-GM |
|---|---|---|---|---|---|---|
| Package | 44-pin QFN EP, 7x7 mm | 44-pin QFN EP, 7x7 mm - same | 44-pin QFN EP, 7x7 mm - same | 44-pin QFN EP, 7x7 mm - same | 44-pin QFN EP, 7x7 mm - same | 44-pin QFN EP, 7x7 mm - same |
| Brand | Skyworks | Skyworks | Skyworks | Skyworks | Skyworks | Skyworks |
| Number of Outputs | 4 | 4 | 4 | 4 | 4 | 10 |
| Maximum Output Frequency | 350 MHz | 350 MHz | 350 MHz | 350 MHz | 350 MHz | 350 MHz |
| Jitter Performance | Sub-100 fs RMS | Sub-100 fs RMS | Slightly higher than B grade | Comparable to B grade | Comparable to B grade | Sub-100 fs RMS |
| Reference Input Range | 0.008 MHz to 750 MHz | 0.008 MHz to 750 MHz | 0.008 MHz to 750 MHz | 0.008 MHz to 750 MHz | 0.008 MHz to 750 MHz | 0.008 MHz to 750 MHz |
| In-Circuit NVM | Yes | Yes | Yes | Yes | Yes | Yes |
| Operating Temperature Range | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Packaging Option | Tray (GM suffix) | Tape and Reel (GMR suffix) | Tray | Tray | Tray | Tray |
Principais diferenciais
- Sub-100 fs RMS jitter with 4 outputs from one reference (vs LMK04803x series)
- In-circuit NVM for deterministic power-up without external load (vs SI5341B-D-GM)
- All-silicon jitter attenuation footprint (vs VCXO-based legacy jitter attenuator modules)
Notas de projeto
Use a continuous ground plane under the SI5344B-D-GM and stitch the exposed thermal pad directly to the ground plane with at least 8 vias at 1.2 mm maximum diameter for low-inductance thermal dissipation. According to the Si5345/44/42 Rev D Family Reference Manual PCB layout section, the crystal traces to XA_P and XA_N must be kept under 5 mm and routed over a clean ground without crossing other signal traces; otherwise spurious modes degrade the achieved jitter performance.
Decouple each VDD_OUT and the VDD core supply with a 0.1 uF X7R ceramic bypass capacitor placed within 2 mm of each pin, plus a 4.7 uF bulk capacitor near the device. The Si5345/44/42 Rev D datasheet recommends ferrite beads between VDD core and VDD_OUT planes if multi-rail switching regulators share the same chassis; this prevents Output-Induced Phase Noise (OIPN) leakage back into the synthesizer.
Maintain 100-ohm differential impedance on every output trace to the load device and use intra-pair length matching within 1 mm per centimeter of trace length to preserve the LVPECL/LVDS compliance eye. For HCSL outputs the 50-ohm single-ended termination must be at the receiver end, while LVDS requires 100-ohm differential at the receiver. LVPECL outputs require 130-ohm Thevenin or equivalent AC-coupling termination, otherwise the output is over-driven.
Estimated: power dissipation at maximum operation is roughly 1.0 W (using core VDD x typ core current + 4 x VDD_OUT x typ output current with all four outputs active at 350 MHz CMOS), so verify thermal rise on the 44-pin QFN EP under your board stack-up. Do not leave the OE_EN pin floating - it must be tied high or low externally to prevent unintended state transitions during power-up.
Informações de conformidade
RoHS and REACH compliance status confirmed from Skyworks/Silicon Labs product pages indexed in distributor listings. Halogen-free status not explicitly stated in the verified web data and is set to unknown per data authenticity rules. The SI5344 family is not AEC-Q100 qualified; choose automotive-grade timing parts from other Skyworks or Texas Instruments families for in-vehicle designs.
