SY75576LKY - 267 MHz 1:4 HCSL Clock Fanout Buffer
部品番号: SY75576LKY ✓ 生産中SY75576LKY 概要
A clock fanout buffer is a clock-and-timing IC that receives a differential reference clock and generates multiple synchronized copies for separate loads. Within the broader hierarchy of semiconductor timing devices, a fanout buffer sits between a clock source and the circuits requiring low-skew clock distribution. Its purpose is to isolate loads, reproduce a high-quality differential waveform, and prevent downstream loading from degrading source jitter or edge timing.
The SY75576LKY is optimized for PCI Express clock-distribution requirements. Its 1:4 differential architecture provides one input pair feeding four output pairs, allowing a PCIe source to drive multiple endpoints while maintaining controlled skew. The stated 137 fs phase jitter and 50 ps maximum output-to-output skew are particularly useful in high-speed serial links where timing uncertainty can reduce eye margin.
The output stage supports HCSL and LVDS signaling, as identified in the product documentation, and operates from a 3.135 V to 3.465 V supply. The industrial temperature range extends from -40 °C to +85 °C. Because the device is intended for high-speed differential distribution, PCB construction, controlled impedance, return paths, and connector or package transition geometry are as important as the nominal clock frequency.
Typical uses include PCI Express endpoint and root-complex clock distribution, high-speed serializer input clocks, networking equipment clock trees, and test-and-measurement systems requiring multiple low-skew copies of one reference. It can also serve as a jitter-isolating fanout stage when placed close to the receiving loads.
For implementation, follow the manufacturer’s recommended decoupling and high-speed layout guidance, keep differential traces impedance-controlled, and avoid adding unnecessary stubs or test pads on the clock path. Validate source, output, and receiver termination requirements across voltage and temperature before releasing the layout.
This page combines the documented clock-performance characteristics, package details, application guidance, and engineering design notes to provide practical selection and layout context beyond a basic distributor parameter list.
ドロップイン代替品: SY75576LKY — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
この製品に利用可能なドロップイン代替品はありません。
代替品をリクエストSY75576LKY 仕様
| Product Type | Fully differential clock fanout buffer |
| Fanout Ratio | 1:4 |
| 最大クロック周波数 | 267 MHz |
| 出力数 | 4 identical differential outputs |
| Output-to-Output Skew | 50 ps maximum |
| Phase Jitter | 137 fs |
| Supply Voltage Range | 3.135 V to 3.465 V |
| 動作温度範囲 | -40 °C to +85 °C |
| Output Signaling | HCSL/LVDS |
| Input Architecture | Fully differential |
| パッケージ | 20-pin TSSOP |
| Package Width | 4.40 mm (0.173 inch) |
| 実装タイプ | Surface mount |
| Primary Application | PCI Express clock distribution |
SY75576LKY 4.40 mm (0.173 inch) ピン配置ガイド
SY75576LKY (4.40 mm (0.173 inch) パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: SY75576LKY.
詳細は データシート をご参照ください。
主な用途
SY75576LKY の用途: 6 件s: PCI Express Reference-Clock Distribution, Networking Equipment Clock Tree, High-Speed Serializer Interface Clocking, Industrial Test and Measurement Equipment, Low-Jitter Clock Fanout Stage, High-Speed Backplane Clock Distribution.
PCI Express Reference-Clock Distribution
The SY75576LKY fits PCI Express clock trees because one fully differential source can feed four identical outputs at up to 267 MHz. Its 137 fs phase jitter and 50 ps maximum output-to-output skew help control timing variation among PCIe destinations while preserving the differential signaling needed for high-speed clock links. Place the device near the branching point, use controlled-impedance routing, and apply the termination scheme required by the transmitter and receiver interfaces.
おすすめ
Networking Equipment Clock Tree
A networking chassis can use the SY75576LKY to distribute one low-jitter differential reference to four clock-consuming circuits without allowing each load to disturb the source. The 1:4 fanout topology reduces the number of separate clock branches, while the 50 ps maximum output-to-output skew establishes a useful lane-to-lane timing relationship. The 3.135 V to 3.465 V supply range suits a regulated 3.3 V rail, subject to system-level noise and power-distribution checks.
おすすめ
High-Speed Serializer Interface Clocking
The SY75576LKY is appropriate when a high-speed serializer requires a clean reference delivered to several internal clock domains. Four differential outputs support separated local routing and can reduce sensitivity to unequal loading, provided each branch uses matched impedance and termination. Its 137 fs phase jitter is a useful timing metric for link-margin analysis, while the 267 MHz rating supports demanding clock rates. System-level reference quality and loss must also be included in the eye-budget calculation.
おすすめ
Industrial Test and Measurement Equipment
The SY75576LKY can distribute a common differential clock to multiple acquisition, synthesis, or calibration channels in industrial test equipment. Tight output-to-output skew supports repeatable sampling relationships, and the -40 °C to +85 °C rating fits equipment intended for controlled industrial environments. Designers should account for long trace losses, connector transitions, and channel-to-channel loading. Short clock branches, solid ground references, and decoupling close to the supply pins improve implementation quality.
おすすめ
Low-Jitter Clock Fanout Stage
The SY75576LKY can be used as a final fanout stage when oscillator or synthesizer outputs require four isolated copies with predictable relative timing. Its low 137 fs phase jitter and maximum 50 ps output-to-output skew help preserve the quality of the reference while providing separate outputs for clock-consuming blocks. For best results, keep the device close to the loads, avoid unnecessary route stubs, and preserve continuous reference planes beneath all differential clock traces.
おすすめ
High-Speed Backplane Clock Distribution
A backplane requiring several synchronized differential clock destinations can use the SY75576LKY to establish a controlled fanout relationship. The 50 ps maximum output-to-output skew provides a defined budget across the four outputs, while the HCSL/LVDS-capable interface supports high-speed differential routing. Backplane implementation remains sensitive to loss, reflections, and connector transitions, so engineers should validate the complete channel and avoid assuming that the buffer compensates for poor physical-layer design.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: SY75576LKY — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
Do not select it merely because it is a clock buffer. Confirm that four differential outputs are required, the HCSL/LVDS interface matches the connected receivers, and the 50 ps skew target satisfies the system timing budget. PCB loss, impedance discontinuities, termination, and clock-source jitter can dominate practical performance even when the IC meets its nominal specifications.
A qualified replacement should match the 20-pin TSSOP footprint, pin configuration, 1:4 differential architecture, supply range, output electrical characteristics, temperature grade, and lifecycle requirements. The available cross-reference results identify the SY75576L family but do not establish enough verified drop-in substitute order codes for a five-part replacement list. Validate any proposed alternative against the manufacturer datasheet and the complete system requirements before releasing a PCB revision.
代替品との比較
| パラメータ | この製品 |
|---|---|
| Product Type | Fully differential clock fanout buffer |
| Brand | Microchip Technology |
| Package | 20-pin TSSOP |
| Fanout Ratio | 1:4 |
| Maximum Frequency | 267 MHz |
| Phase Jitter | 137 fs |
| Maximum Output-to-Output Skew | 50 ps |
| Supply Voltage Range | 3.135 V to 3.465 V |
| Operating Temperature Range | -40 °C to +85 °C |
| Output Signaling | HCSL/LVDS |
主な差別化要因
- Low phase jitter for a four-output differential clock buffer （vs Generic multi-output clock buffer)
- Purpose-built one-to-four differential distribution （vs Single-output or non-differential clock driver)
- PCI Express-oriented performance （vs General-purpose low-frequency fanout buffer)
設計ノート
Route the differential clock pairs as coupled, impedance-controlled traces with a continuous reference plane and avoid layer transitions wherever possible. Keep the fanout junction compact and make the four branches electrically similar so that unequal loading does not consume the 50 ps output-to-output-skew budget. Do not add unused stubs, test pads, or long coupled test-point structures directly to high-speed clock nets without simulating their loading.
Place the manufacturer-recommended bypass capacitors close to the supply and ground pins, with short, low-impedance connections and an uninterrupted ground return. The documented operating range is 3.135 V to 3.465 V, so verify the system rail remains within this interval during startup, load transients, and temperature extremes. Avoid routing supply current through clock-trace return paths because clock-edge timing and supply noise can otherwise become coupled.
Use the exact differential input and output termination scheme specified by the manufacturer and connected receivers. Account for the interconnect loss between the buffer and every load, including connector transitions and PCB escape paths. Validate rise time, reflection, differential voltage, and timing at the receiver rather than relying only on the 267 MHz frequency rating, because those parameters establish whether the complete clock channel remains usable.
コンプライアンス情報
No RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive-qualification declaration was identified in the manufacturer product listing or indexed datasheet summaries. The SY75576LKY is an industrial-temperature clock IC, not an automotive-qualified device.