Si5367 - uP-Programmable Precision Clock Multiplier | Silicon Labs
N.º de pieza: Si5367 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1.000 | $0 | $0,00 |
Si5367 Descripción general
A clock multiplier (also called a frequency synthesizer or clock generator) is a timing IC that produces higher-frequency clock signals from a lower-frequency reference. Within the power-management and timing hierarchy, clock multipliers sit alongside jitter attenuators, clock buffers, and oscillators as members of the broader clock and timing IC family. Multipliers differ from jitter cleaners: a multiplier converts frequency without reducing phase noise inherited from the input, whereas a jitter attenuator like the Si5317 actively cleans the clock.
The Si5367's headline features include any-rate frequency synthesis via Silicon Laboratories' 3rd-generation DSPLL technology, microprocessor programmability through an I2C or SPI interface, four selectable input references, and five independent outputs. DSPLL integration eliminates the need for an external VCXO and external loop filter components, dramatically reducing board area and BOM count compared with discrete PLL implementations.
Architecturally, the third-generation DSPLL implements an all-digital loop that synthesizes the output frequency from a programmable multiplication ratio relative to the selected input. Because both input frequency and multiplication ratio are register-programmable at runtime, a single Si5367 can support multiple line rates and standards in one design, simplifying inventory and enabling field reconfiguration.
Typical applications include line-card and network-synchronization clock synthesis in SONET/SDH and Ethernet equipment, frequency translation for FPGA and ASIC reference clocks, and test-and-measurement instrumentation requiring flexible multiplication ratios.
Design consideration: since the Si5367 multiplies without jitter attenuation, input jitter transfers to the outputs multiplied by the frequency ratio; use a clean reference or a dedicated jitter attenuator upstream when low-output jitter is critical.
This page adds distributor-linked data sources, same-family drop-in alternatives, and practical design notes not consolidated in the manufacturer datasheet.
Alternativas directas para Si5367 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con Si5367 (mismo factor de forma y huella) — difiere en Core Technology, External Loop Filter Required, External VCXO Required, Input Clock Frequency Range, Input Frequency Range.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
Si5365
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$32.4 / unidad
Ver hoja de datos →Si5366
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$13.75 / unidad
Ver hoja de datos →Si5368
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$40.15 / unidad
Ver hoja de datos →Si5367 variants
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
Si5367 Especificaciones
| Product Type | uP-Programmable Precision Clock Multiplier |
| Input Clock Frequency Range | 10 MHz to 707 MHz (4 inputs) |
| Output Clock Frequency Range | 2 kHz to 945 MHz (5 outputs); select frequencies to 1.4 GHz |
| Number of Clock Inputs | 4 |
| Number of Clock Outputs | 5 |
| Core Technology | Silicon Labs 3rd-generation DSPLL |
| Programming Interface | I2C or SPI (uP-programmable) |
| External VCXO Required | No (integrated DSPLL) |
| External Loop Filter Required | No (integrated DSPLL) |
| Jitter Attenuation | No (multiplication without jitter attenuation) |
| Package Type | TQFP |
| Tipo de montaje | Surface Mount |
| Tipo de salida | Frequency-multiplied clock, any-rate synthesis |
Guía de configuración de pines de Si5367 tqfp
Configuración de pines para Si5367 (encapsulado tqfp). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para Si5367.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
Si5367 es adecuado para 6 aplicacións: SONET/SDH Line Card Clock Synthesis, FPGA and ASIC Reference Clock Generation, Ethernet Equipment Frequency Translation, Test and Measurement Instrumentation, Multi-Rate Clock Inventory Consolidation, Broadcast Video and Audio Master Clock Generation.
SONET/SDH Line Card Clock Synthesis
The Si5367 fits SONET/SDH line-card designs that must derive multiple line-rate clocks from a single reference. Its four inputs spanning 10 MHz to 707 MHz accept standard synchronization references (such as 19.44 MHz or 155.52 MHz), while the five multiplied outputs reach 945 MHz to cover OC-x payload and fabric clocks. The any-rate DSPLL means one programmable device replaces multiple fixed-ratio PLLs, and the I2C/SPI interface lets a line card switch line rates in service. Because the part multiplies without jitter attenuation, the synchronization reference should already meet the system jitter budget, or a jitter attenuator such as the Si5368/Si5317 should be placed upstream so multiplied phase noise stays within allocation.
Recomendado
FPGA and ASIC Reference Clock Generation
FPGAs and high-speed ASICs frequently need several unrelated clock frequencies - core logic, transceiver reference, and interface clocks - derived from one crystal or backplane reference. The Si5367 addresses this by generating five independent outputs from 2 kHz to 945 MHz (select frequencies to 1.4 GHz), covering SerDes reference ranges while the I2C/SPI programmability lets firmware retarget frequencies during bring-up or mode changes. The integrated DSPLL removes the external VCXO and loop filter that a discrete solution would require, shrinking the clock tree. Designers should budget for the multiplication of reference phase noise into transceiver reference clocks, since the Si5367 does not attenuate jitter.
Recomendado
Ethernet Equipment Frequency Translation
Ethernet switches, routers, and carrier Ethernet equipment must translate a backplane or BITS reference into line-rate clocks for PHYs across many speeds. The Si5367's four selectable inputs let a chassis switch among redundant timing sources (10 MHz, 25 MHz, 125 MHz, 156.25 MHz), while its programmable multiplication ratio synthesizes the needed PHY references on the five outputs up to 945 MHz. Runtime reprogramming over I2C or SPI supports multi-rate designs - one board serving 1G/10G/25G/40G variants - reducing the number of unique clock ICs in inventory. As with all pure multipliers, output jitter is set by the reference quality times the ratio, so a clean synchronization source is recommended.
Recomendado
Test and Measurement Instrumentation
Bench instruments, arbitrary waveform generators, and protocol testers need flexible frequency synthesis across a very wide range, and the Si5367's 2 kHz to 945 MHz output span (select frequencies to 1.4 GHz) with any-rate multiplication matches this requirement directly. The four inputs let an instrument lock to external references of nearly any common rate, while the microprocessor interface lets instrument firmware compute and load a multiplication ratio on the fly - impossible with fixed-ratio PLLs. The DSPLL integration eliminates a tuned loop filter, so the instrument can cover its full frequency range without switching analog components, improving repeatability and calibration simplicity across test configurations.
Recomendado
Multi-Rate Clock Inventory Consolidation
Equipment vendors supporting multiple standards on one platform - for example SONET/SDH plus Ethernet plus OTN - historically populate several fixed-ratio PLLs, one per line rate. The Si5367 consolidates this inventory: its programmable input mapping and multiplication ratio let a single TQFP device produce 19.44 MHz-derived, 155.52 MHz-derived, or 156.25 MHz-derived families as required, reconfigured by firmware rather than a board spin. The five independent outputs serve several subsystems from one part, cutting BOM lines and qualification effort. Engineering teams should document each supported ratio's jitter transfer in validation, since multiplication scales reference noise by design and the DSPLL bandwidth shapes the resulting output spectrum.
Recomendado
Broadcast Video and Audio Master Clock Generation
Broadcast and professional AV systems require reference clocks at standards-defined rates (for example 27 MHz, 74.25 MHz, and 148.5 MHz families) derived from house sync. The Si5367 accepts house references from 10 MHz to 707 MHz on four inputs and multiplies them to the required video clocks on its five outputs, with the low-jitter DSPLL output suitable for SDI serializer references. Firmware programmability over I2C/SPI allows a single genlock card to support SD, HD, and 3G-SDI rates without component changes. Since the device multiplies without cleaning, the house reference generator quality determines the final output jitter; a jitter-attenuating stage is advisable where SDI eye masks must be guaranteed.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para Si5367 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | Si5365 | Si5366 | Si5368 |
|---|---|---|---|---|
| Package | TQFP | TQFP - same family footprint | TQFP - same family footprint | TQFP - same family footprint |
| Brand | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| Primary Function | Clock multiplication (no jitter attenuation) | Network synchronizer (jitter attenuating) | Network synchronizer (jitter attenuating) | Jitter-attenuating precision clock |
| PLL Technology | 3rd-generation DSPLL, no external VCXO/loop filter | DSPLL family | DSPLL family | DSPLL family |
| Jitter Attenuation | No | Yes | Yes | Yes |
Diferenciadores clave
- Pure multiplication without attenuation (frente a Si5368)
- Integrated DSPLL removes external VCXO and loop filter (frente a Discrete PLL implementations)
- Trade-off: no jitter cleaning (frente a Si5317)
Notas de diseño
The most common Si5367 misapplication is expecting jitter attenuation. The datasheet explicitly positions this part for multiplication WITHOUT jitter attenuation; any input reference noise is transferred (and effectively scaled by the frequency ratio) to the outputs. If your output jitter budget was computed assuming a cleaning loop, substitute the Si5368 or add an Si5317 upstream, or guarantee a low-noise reference source.
Decouple the DSPLL supplies with low-ESR ceramic capacitors placed directly at the supply pins, and keep the analog/PLL supply domain separated from noisy digital rails when possible. Phase noise on the supply converts to output clock spurs; follow the supply recommendations in the Si5367 datasheet and Reference Manual rather than reusing generic decoupling from other PLL circuits.
Keep the input reference traces short and route them away from the five high-slew-rate outputs, which can capacitively couple into inputs and produce spurs. Use a solid ground plane under the clock section and match output trace lengths for groups feeding synchronous loads. Validate the configuration by loading the intended multiplication ratio over I2C/SPI and measuring phase noise at each output, not just frequency accuracy.
Información de cumplimiento
Compliance status was not stated in the provided verified data; consult the Skyworks/Silicon Labs product page or distributor listings for current RoHS/REACH declarations.
