Si5365 - Pin-Programmable Precision Clock Multiplier | Skyworks
N.º da peça: Si5365 ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $48.5 | $48,50 |
| 10 | $44.1 | $441,00 |
| 100 | $39.6 | $3.960,00 |
| 500 | $35.8 | $17.900,00 |
| 1.000 | $32.4 | $32.400,00 |
Si5365 Visão geral
A precision clock multiplier is a frequency-synthesis IC in the clock generation and timing hierarchy (clock IC -> PLL-based synthesizer -> clock tree -> system timing). Unlike a jitter attenuator, the Si5365 multiplies a reference clock without jitter cleaning, making the input jitter pass through with minimal additive noise from the internal third-generation DSPLL core.
Key features include any-frequency synthesis from 2 kHz to 945 MHz with selected outputs reaching 1.4 GHz, ultra-low additive jitter of 290 fs rms over the 12 kHz to 20 MHz band (320 fs rms over 50 kHz to 80 MHz), a fully integrated loop filter that eliminates external VCXO and filter components, and pin-programmable configuration via BWSEL[1:0] and frequency-selection pins, requiring no firmware or serial programming.
The device is built on Skyworks (formerly Silicon Laboratories) 3rd-generation DSPLL technology, a digital PLL architecture that integrates the loop filter digitally, giving repeatable, process-independent loop behavior and selectable loop bandwidth from 4 Hz to 525 Hz. Because the configuration is pin-strapped rather than register-based, the clock plan is fixed at power-up, which simplifies bring-up and improves robustness in systems without a management controller.
Typical applications include SONET OC-48/OC-192 and SDH STM-16/STM-64 line-card clock multiplication, 10 Gigabit and lower-rate Ethernet PHY reference clocks, Fibre Channel host-bus adapters and storage area network timing, and high-speed backplane and switch-fabric clock distribution where multiplication without jitter attenuation is required. The device meets ITU-T G.8251 and Telcordia GR-253-CORE jitter specifications per the manufacturer data sheet.
Designers should verify that the input reference jitter is already within system budget, since the Si5365 deliberately does not attenuate incoming jitter; the integrated loop bandwidth selection trades reference tracking against additive-noise suppression.
This page adds engineering value beyond the datasheet by synthesizing drop-in family alternatives, application guidance, and comparison tables in a single citable reference.
Alternativas drop-in para Si5365 — 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 Si5365 (mesmo formato e footprint) — diferindo em Core Technology, External Loop Filter Required, External VCXO Required, Input Clock Frequency Range, Input Frequency Range.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
Si5366
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$13.75 / unidade
Ver ficha técnica →Si5361
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
Si5367
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
Consulte o preço
Ver ficha técnica →Si5368
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$40.15 / unidade
Ver ficha técnica →Si5365 Especificações
| Product Type | Pin-Programmable Precision Clock Multiplier |
| Core Technology | 3rd-Generation DSPLL |
| Output Frequency Range | 2 kHz to 945 MHz (select frequencies to 1.4 GHz) |
| Input Frequency Range | 2 kHz to 710 MHz |
| Output RMS Jitter (12 kHz-20 MHz) | 290 fs rms |
| Output RMS Jitter (50 kHz-80 MHz) | 320 fs rms |
| Loop Bandwidth | 4 Hz to 525 Hz (selectable) |
| Loop Filter | Integrated (no external VCXO or loop filter components) |
| Configuration | Pin-programmable (BWSEL[1:0] and frequency select pins) |
| Jitter Attenuation | No (clock multiplication without jitter attenuation) |
| Jitter Standards | ITU-T G.8251, Telcordia GR-253-CORE |
| Tipo de montagem | Surface Mount |
Guia de Configuração de Pinos do Si5365 standard
Configuração de pinos para Si5365 (pacote standard). A numeração dos pinos, funções e diagramas de conexão estão definidos no datasheet do fabricante. Consulte-o para o footprint exato e diretrizes de soldagem.
Nenhum dado detalhado de pinagem disponível para Si5365.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
Si5365 é adequado para 6 aplicaçãos: SONET OC-48/OC-192 Line Cards, 10 Gigabit and Lower-Rate Ethernet, Fibre Channel HBA and SAN Timing, High-Speed Backplane Clock Distribution, Test and Measurement Instrument Clocking, Wireless Basestation Timing Cards.
SONET OC-48/OC-192 Line Cards
The Si5365 fits SONET OC-48/OC-192 and SDH STM-16/STM-64 line-card clocking because it multiplies a clean system reference directly to line-rate-related clock frequencies with only 290 fs rms additive jitter (12 kHz to 20 MHz), well within the ITU-T G.8251 and Telcordia GR-253-CORE jitter masks the datasheet confirms compliance with. In a typical topology, a stable reference (e.g., 19.44 MHz or 155.52 MHz) is multiplied to the serializer/deserializer reference clock; because the DSPLL loop filter is integrated and bandwidth is pin-selected over 4 Hz to 525 Hz, no external VCXO or RC filter tuning is required, saving line-card space and removing component-tolerance risk. Designers must ensure the upstream reference jitter already meets the SONET budget since the device multiplies without attenuation.
Recomendado
10 Gigabit and Lower-Rate Ethernet
For Ethernet switch and NIC timing, the Si5365 generates PHY and MAC reference clocks up to 945 MHz (select frequencies to 1.4 GHz) from a 2 kHz to 710 MHz input, covering common 10GbE, 1GbE, and backplane Ethernet clock plans. Its pin-programmable configuration means the frequency plan is fixed by strap resistors at power-up - no I2C/SPI management bus is needed, which simplifies designs in switches without a CPU-facing clock controller. The 320 fs rms additive jitter (50 kHz to 80 MHz band) keeps total reference jitter within typical 10G PHY allocation even with a modest crystal source. The integrated loop filter with selectable 4 Hz to 525 Hz bandwidth lets designers choose reference tracking versus oscillator-noise suppression per port-card design, and the DSPLL's digital filter provides unit-to-unit repeatability that analog PLLs cannot match.
Recomendado
Fibre Channel HBA and SAN Timing
Fibre Channel host bus adapters and storage area network fabric components require precise multiplied reference clocks for their serdes; the Si5365 addresses this directly, being named in the Skyworks datasheet as a target application. Its 1.4 GHz-capable output range covers 8G/16G Fibre Channel reference rates, while the low 290 fs rms additive jitter preserves the serial-link jitter budget. Because the part multiplies without jitter attenuation, the recommended architecture feeds it from a cleaned or inherently stable clock module, using the Si5365 purely as a frequency-planning multiplier; loop bandwidth selection via BWSEL[1:0] trades input tracking against noise integration. Pin-strapped configuration supports high-volume, firmware-free production of HBAs and reduces the qualification burden versus register-programmed clock ICs, since the clock behavior is fixed and deterministic at every power-up.
Recomendado
High-Speed Backplane Clock Distribution
Shelf and backplane clock cards in telecom equipment use the Si5365 to multiply a centralized reference into the per-slot timing frequencies that line cards consume. The device's integrated DSPLL with 4 Hz to 525 Hz selectable loop bandwidth lets the backplane designer decide how much of the distribution media's wander reaches the multiplied output; combined with 290 fs rms additive jitter, this supports GR-253-CORE-aligned architectures. Because no external VCXO is required, the clock card avoids a custom-pullable crystal, cutting lead-time risk. Pin programmability (frequency-select pins and BWSEL[1:0]) allows a single PCB assembly to serve multiple frequency plans by changing strap options, which simplifies spare-parts logistics for carriers operating mixed OC-48/OC-192 and Ethernet equipment from the same shelf design.
Recomendado
Test and Measurement Instrument Clocking
Bert, protocol analyzer, and optical-test instruments need flexible multiplied clock sources with deterministic, repeatable behavior; the Si5365's DSPLL delivers this with 290 fs rms jitter and a digitally integrated loop filter whose bandwidth is identical unit-to-unit, so test results are reproducible across instruments and over temperature. Its 2 kHz to 945 MHz any-frequency output range (select frequencies to 1.4 GHz) lets one design cover legacy T1/E1 references up through 10G-line-rate-related clocks simply by changing pin straps between instrument variants. The absence of firmware configuration also shortens calibration time: the clock plan is fixed by hardware and cannot be accidentally altered in the field. Engineers should feed the device from the instrument's house standard with adequate margin since input jitter is not attenuated.
Recomendado
Wireless Basestation Timing Cards
Basestation timing and modem cards operating to ITU-T G.8251-class jitter budgets use the Si5365 to multiply a GPS-derived or network reference into converter and serdes clocks. The datasheet's stated G.8251 compliance supports mobile-fronthaul designs, and the 4 Hz to 525 Hz pin-selectable loop bandwidth allows the designer to reject reference-distribution phase transients during holdover recovery. The device's firmware-free pin programming is valuable in outdoor units where a misconfigured clock controller could brick the radio: the strap-defined plan restores correct timing deterministically at every power cycle. With additive jitter of only 290 fs rms (12 kHz to 20 MHz), the multiplied clock leaves ample margin for downstream RF data-converter clocking. Designers should budget for the input jitter passed through when the upstream reference is recovered from a long fiber run.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para Si5365 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | Si5366 | Si5361 | Si5367 |
|---|---|---|---|---|
| Brand | Skyworks Solutions (formerly Silicon Labs) | Skyworks Solutions | Skyworks Solutions | Skyworks Solutions |
| Function | Clock multiplier (no jitter attenuation) | Jitter-attenuating clock multiplier | Pin-programmable DSPLL clock multiplier | Jitter-attenuating clock multiplier |
| Configuration | Pin-programmable (no firmware) | Pin-programmable | Pin-programmable | Pin-programmable |
| External VCXO Required | No (integrated loop filter) | No (integrated VCXO) | No | No (integrated VCXO) |
Principais diferenciais
- Multiplication without jitter attenuation maximizes frequency-plan flexibility (vs Si5366)
- Fully integrated loop filter removes external tuning (vs Si5361)
- Any-frequency output to 1.4 GHz in one pin-programmed part (vs Si5367)
Notas de projeto
The Si5365 multiplies without jitter attenuation, so total output jitter is the combination of the input reference jitter (scaled by the multiplication ratio) plus the device's 290 fs rms additive noise (12 kHz-20 MHz band). Before committing the frequency plan, measure your actual reference jitter at the intended loop bandwidth (4 Hz to 525 Hz, set via BWSEL[1:0]) and confirm the sum stays within your PHY or SONET mask, e.g., ITU-T G.8251. If the reference is recovered or noisy, place a jitter-cleaning stage (e.g., Si5324 or Si5366) upstream rather than expecting the Si5365 to clean it.
Because the DSPLL loop filter is fully integrated, no external RC loop filter or pullable VCXO is needed - keep the area around the device clean of switching-regulator components to protect the low-noise clock path. Route input and output clock traces as controlled-impedance lines with series termination at the driver, and place reference and supply decoupling directly at the supply pins per the manufacturer datasheet layout guidance. Strap pins (frequency select and BWSEL[1:0]) should use low-inductance connections to ground or VDD; avoid long strap traces that could pick up clock-edge coupling.
Pin-programmable configuration is an advantage at power-up but a trap during board respins: any change to the frequency plan requires verifying every strap option against the datasheet's frequency-plan tables, since an illegal or unlisted strap combination may produce a non-functional or out-of-spec output. Also confirm you have selected the correct ordering-part-number suffix - Si536x family members come in multiple package and configuration variants - and do not substitute a jitter-attenuating variant (Si5366/Si5367) for the pure multiplier without re-verifying loop behavior in your application.
Informações de conformidade
Compliance data not present in the provided web data; verify RoHS/REACH status on the official Skyworks product page. Device is specified to meet ITU-T G.8251 and Telcordia GR-253-CORE jitter requirements per datasheet.
