SY75572LMG - 267MHz Differential Clock Fanout | Microchip
N.º de pieza: SY75572LMG ✓ ActivoSY75572LMG Descripción general
A clock fanout buffer is a timing IC that receives one differential clock source and reproduces it across multiple output paths. This architecture helps maintain consistent clock timing across widely separated circuits while reducing load-dependent distortion at the source. The SY75572LMG extends this concept with a 2:1 input MUX, allowing two differential input choices to be selected for the two identical output copies.
HCSL and LVDS logic levels are supported for input and output operation according to the manufacturer product description. These high-speed differential signaling levels are commonly used in clock links associated with PCI Express systems, where low jitter, controlled skew, and reliable signal transmission are important. The device operates from a 3.3 V ±5% power supply, as stated in the manufacturer datasheet listing.
The principal performance characteristics are the 267 MHz operating frequency, 137 fs phase jitter, and 50 ps maximum output-to-output skew. The differential clock architecture provides two matching output copies, while the integrated multiplexer enables source selection in systems that need flexible clock routing or redundancy. Its 16-VFQFN exposed-pad package is intended for compact surface-mount designs requiring careful high-speed layout practices.
Typical uses include PCI Express reference-clock distribution, server and workstation clock trees, communications equipment, test and measurement systems, and other high-speed digital platforms. The exposed pad provides a thermal connection to the PCB copper, allowing heat to be transferred away from the device when the board layout includes suitable thermal vias and copper area.
For implementation, route differential clock pairs as controlled-impedance nets on a multilayer PCB, keep the input and output paths short, and place decoupling capacitors close to the supply pins. Follow the pin-description table and recommended layout in the manufacturer datasheet when assigning tracks, terminating the differential network, and confirming the exposed-pad connection.
This page organizes the verified SY75572LMG specifications, pricing evidence rules, source links, and application guidance into an engineering-focused reference. It also distinguishes confirmed device characteristics from parameters that require direct consultation of the manufacturer datasheet before schematic release or PCB implementation.
Alternativas directas para SY75572LMG — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
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| Product Type | Fully differential 1:2 clock fanout buffer |
| Input Multiplexer | 2:1 input MUX |
| Frecuencia de reloj máxima | 267 MHz |
| Phase Jitter | 137 fs |
| Maximum Output-to-Output Skew | 50 ps |
| Configuración de salida | Two identical differential output copies |
| Tensión de alimentación | 3.3 V ±5% |
| Supported Logic Levels | HCSL and LVDS |
| Primary Application | PCI Express clock distribution |
| Encapsulado | 16-VFQFN with exposed pad |
| Tipo de montaje | Surface mount |
| Differential Input Count | 2 differential inputs selected by the 2:1 MUX |
| Differential Output Count | 2 differential outputs |
| Output Skew Control | Maximum 50 ps output-to-output skew |
| Jitter Performance | 137 fs phase jitter |
| Operating Frequency | Up to 267 MHz |
| Thermal Pad | Exposed pad |
Guía de configuración de pines de SY75572LMG 16-vfqfn with exposed pad
Configuración de pines para SY75572LMG (encapsulado 16-vfqfn with exposed pad). 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 SY75572LMG.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
SY75572LMG es adecuado para 6 aplicacións: PCI Express Reference-Clock Distribution, Server Clock-Tree Fanout, PCIe-to-Ethernet Interface Timing, Communications Equipment Clock Fanout, Test and Measurement Clock Distribution, Industrial Control and Data Acquisition.
PCI Express Reference-Clock Distribution
The SY75572LMG fits PCI Express reference-clock trees because it distributes one selected differential clock into two identical copies while operating up to 267 MHz. Its 137 fs phase jitter and 50 ps maximum output-to-output skew help preserve timing quality across two destinations. The 2:1 input MUX provides source selection, which can support clock redundancy or routing between upstream sources. Use controlled-impedance differential routing and follow the datasheet's clock, termination, decoupling, and exposed-pad layout requirements.
Recomendado
Server Clock-Tree Fanout
The SY75572LMG can fan out a 267 MHz differential clock to two server or storage subsystems that require closely related timing. Two identical output copies reduce the risk that downstream devices receive materially different clock phases, while the 50 ps output-to-output skew specification establishes the maximum inter-output difference. The 3.3 V ±5% supply operation aligns with low-voltage server clock domains. Place the device near the clock source or split point and minimize stub length to preserve signal integrity.
Recomendado
PCIe-to-Ethernet Interface Timing
A SY75572LMG-based clock tree can provide matched differential clocks to PCI Express and Ethernet interface circuitry when both subsystems need repeatable phase relationships. Its 2:1 input multiplexer permits selection of two clock sources, while the 1:2 differential fanout produces two copies with a maximum 50 ps skew. The 137 fs phase-jitter figure supports timing margin in high-speed interfaces. Validate source amplitude, impedance, termination, and channel topology against the manufacturer guidelines before fabrication.
Recomendado
Communications Equipment Clock Fanout
The SY75572LMG is appropriate for communications equipment that distributes a high-speed differential clock to two processing or line-card sections. It combines a 267 MHz operating limit with low phase jitter, and its two outputs are specified as identical copies with no more than 50 ps skew between them. HCSL and LVDS support gives designers options for interoperating with clock interfaces. The 16-VFQFN package saves board area, but the exposed pad must be connected to the required PCB thermal and ground structure.
Recomendado
Test and Measurement Clock Distribution
The SY75572LMG can distribute a precise differential reference clock between two instruments, acquisition channels, or trigger-processing sections. Its 137 fs phase jitter and 50 ps maximum output-to-output skew provide useful timing characteristics for coherent multi-channel measurement. The 2:1 MUX allows the system to select between clocks when carrying out calibration or switching test sequences. Preserve signal integrity with short differential routes, symmetric geometry, controlled reference planes, and terminations selected from the datasheet's recommended application circuit.
Recomendado
Industrial Control and Data Acquisition
The SY75572LMG supports industrial control and data-acquisition systems where a common differential clock must reach two high-speed acquisition or processing chains. Its two identical outputs provide a straightforward fanout arrangement, and the maximum 50 ps output skew helps maintain a predictable relationship between synchronized channels. Operation from a 3.3 V ±5% supply simplifies integration with compatible logic rails. For factory equipment, confirm the device's specified temperature grade and any site-specific compliance requirements before release.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para SY75572LMG — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Diferenciadores clave
- Integrated low-skew clock fanout with source multiplexing (frente a A generic single-input differential clock buffer)
- PCI Express-oriented high-speed timing performance (frente a A lower-performance general-purpose clock buffer)
- Compact surface-mount implementation (frente a A through-hole or larger-outline clock buffer)
Notas de diseño
Route the differential clock inputs and outputs as short, symmetric, controlled-impedance pairs with a continuous reference plane. Avoid stubs, abrupt geometry changes, and routing the two clock copies through materially different paths. Use the differential impedance and spacing specified by the manufacturer application circuit, and keep return-current paths continuous beneath each pair to limit radiated emissions and susceptibility to adjacent high-speed signals.
Place the SY75572LMG close to the clock split point, decoupling capacitors close to its supply pins, and termination components close to the relevant driver or receiver pins according to the datasheet recommendations. The 16-VFQFN exposed pad is a thermal and electrical land, so connect it to the required ground or thermal structure with adequate via placement. Avoid placing noisy converters and high-current paths beside the differential clock inputs.
Do not substitute a generic differential clock buffer solely because its frequency rating is similar. Verify pin assignments, input MUX behavior, HCSL or LVDS compatibility, supply tolerance, output enable or configuration pins, and exposed-pad requirements. Also check whether the candidate preserves the SY75572LMG's 137 fs phase-jitter and 50 ps output-skew targets; a pin-compatible part with materially poorer timing can still change system-level margin.
Use the manufacturer's clock topology and termination arrangement when configuring inputs and outputs. Differential clock integrity depends on correct source impedance, receiver termination, pair symmetry, and loss management rather than frequency alone. If bypassing or multiplexing sources, account for switch insertion loss and timing perturbation, and confirm that the selected configuration still meets the downstream device's reference-clock requirements.
Información de cumplimiento
Compliance attributes were not explicitly stated in the retrieved product summaries. Review the manufacturer's product page and current material-declaration documentation before production release.
