SY89837UMG - 2GHz 1:8 LVPECL Fanout Buffer | Microchip
部品番号: SY89837UMG ✓ 生産中SY89837UMG 概要
A clock fanout buffer is a digital interface IC belonging to the clock and timing IC hierarchy. It provides multiple low-jitter copies of a clock rather than changing the clock frequency. Clock buffers and drivers are used to extend reach, isolate loads, reduce skew, and improve clock distribution in communications, industrial, server, and test systems. The SY89837UMG adds a redundant-input multiplexer intended for systems where a second clock source may take over when the primary source fails.
The 1:8 fanout architecture provides eight outputs from one selected input pair. A maximum operating frequency of 2 GHz supports high-speed digital clocking, while the 2:1 differential multiplexer supports source redundancy. The runt pulse eliminator is the defining functional feature: unlike an ordinary input multiplexer, it is designed to prevent short cycles or runt pulses from appearing at the outputs during switchover. This makes the device relevant to clock systems where an incorrect narrow pulse could create a functional fault downstream.
The outputs are 800 mV LVPECL-compatible and have guaranteed rise and fall times below 200 ps. LVPECL is a high-speed differential logic family commonly used where low voltage swing and controlled edge rates are useful. The input stage accepts CML, LVDS, and PECL signaling, allowing the device to operate in systems using different clock-source conventions. The 2.375 V to 3.6 V supply range covers both nominal 2.5 V and 3.3 V implementations, subject to the exact operating limits of each selected rail.
Typical applications include redundant server and telecommunications clock trees, industrial control systems, high-speed test equipment, network-interface clock distribution, and FPGA or ASIC clocking. The differential multiplexer is particularly useful when two potential clock sources must be combined without exposing downstream logic to runt pulses. The eight outputs can reduce the number of separate fanout stages required in a multi-branch clock architecture.
Designers should treat input selection, termination, differential routing, and output impedance as an integrated high-speed signal-integrity task. Keep the differential input and LVPECL output traces short, matched, and continuous over a suitable reference plane, and use the manufacturer pin-description table when assigning every terminal. Validate switchover timing in the complete system because the behavior of the selected clock source, receiver thresholds, and downstream logic affects the observable result.
This product summary organizes the SY89837UMG's fanout, multiplexer, logic-level, supply, frequency, package, and environmental characteristics into an application-focused guide. It also distinguishes confirmed device parameters from information that requires confirmation from the manufacturer datasheet before layout, replacement, or production qualification.
ドロップイン代替品: SY89837UMG — 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。
SY89837U
✅ ドロップイン📋 参考代替品（カタログ未掲載）
SY89837UMG 仕様
| Product Type | Clock fanout buffer with differential input multiplexer |
| Fanout Ratio | 1:8 |
| Maximum Frequency | 2 GHz |
| Input Multiplexer Ratio | 2:1 differential |
| Supported Input Levels | CML, LVDS, PECL |
| Output Level | LVPECL |
| 出力電圧 | 800 mV |
| Output Rise/Fall Time | Less than 200 ps |
| Output Compatibility | 100K LVPECL compatible |
| Supply Voltage Range | 2.375 V to 3.6 V |
| Nominal 2.5 V Supply Tolerance | Plus or minus 5% |
| Nominal 3.3 V Supply Tolerance | Plus or minus 10% |
| 動作温度範囲 | -40°C to +85°C |
| パッケージ | 32-VFQFN exposed pad |
| Package Family | VQFN surface-mount package family |
| Switchover Feature | Runt pulse eliminator input multiplexer |
| Application Category | Clock redundancy and distribution |
SY89837UMG vqfn surface-mount package family ピン配置ガイド
SY89837UMG (vqfn surface-mount package family 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: SY89837UMG.
詳細は データシート をご参照ください。
主な用途
SY89837UMG の用途: 6 件s: Redundant Server Clock Distribution, Telecommunications Redundant Clock Trees, FPGA and ASIC Clock Distribution, Industrial Test and Measurement Equipment, Network Interface Clock Fanout, High-Speed Instrumentation Clocking.
Redundant Server Clock Distribution
The SY89837UMG fits redundant server clock trees because it selects between two differential clock inputs and distributes the selected source to eight LVPECL outputs. Its 2:1 differential multiplexer includes a runt pulse eliminator intended to prevent short cycles during source switchover, while the maximum operating frequency of 2 GHz supports high-speed system clocks. The eight outputs reduce the number of separate fanout stages required for processor, FPGA, networking, and interface clock branches. For deployment, confirm source-compatible CML, LVDS, or PECL levels, maintain the specified 2.375 V to 3.6 V supply range, and validate switchover behavior with the actual clock sources and receiver thresholds.
おすすめ
Telecommunications Redundant Clock Trees
Telecommunications equipment benefits from the SY89837UMG's differential 2:1 source selection and eight-output fanout arrangement. The manufacturer describes the runt pulse eliminator as preventing short cycles or runt pulses during switchover, a useful distinction in equipment that must preserve clock continuity while transferring between redundant sources. Maximum frequency is 2 GHz, and the 800 mV LVPECL outputs have rise and fall times guaranteed below 200 ps. Design the input network for the selected CML, LVDS, or PECL source and use controlled-impedance routing for the eight differential outputs. Verify channel skew and receiver margins against the interface cards that consume the distributed clock.
おすすめ
FPGA and ASIC Clock Distribution
The SY89837UMG is appropriate when an FPGA or ASIC requires several clock branches and may need to switch between two source references. One selected differential pair feeds an eight-output LVPECL fanout, while the integrated 2:1 multiplexer can select the preferred redundant reference. The device operates up to 2 GHz and produces fast edges below 200 ps, supporting high-speed clock distribution where channel-to-channel skew and input thresholds have been validated. Designers should confirm the receiver's differential impedance, common-mode range, bias requirements, and maximum input frequency. Keep traces short and matched, and account for the package exposed pad when constructing the land pattern.
おすすめ
Industrial Test and Measurement Equipment
The SY89837UMG can distribute a selected differential clock to eight measurement or stimulus channels in industrial test equipment. Its 1:8 fanout reduces duplication in multi-channel systems, while the 2:1 multiplexer allows a redundant clock input when instrument continuity is important. A maximum frequency of 2 GHz accommodates high-speed test clocks, and the -40°C to +85°C industrial operating range supports controlled industrial environments. The LVPECL output stage provides fast rise and fall times below 200 ps, but cable, fixture, or PCB loss can still affect useful bandwidth. Validate the complete channel with its intended loading, termination, and switching sequence before production release.
おすすめ
Network Interface Clock Fanout
The SY89837UMG fits network-interface clock fanout where multiple high-speed logic domains require copies of one selected differential clock. Eight LVPECL outputs can feed compatible networking, switching, or line-card circuits without a cascade of individual buffer packages. If the equipment includes redundant oscillators or recovered clocks, the 2:1 differential multiplexer and runt pulse elimination add value beyond ordinary fanout. The device supports CML, LVDS, or PECL input sources and operates to 2 GHz. Layout must preserve differential symmetry and minimize discontinuities, while system validation should cover source amplitude, termination, clock duty cycle, and the behavior of downstream receivers during redundancy changes.
おすすめ
High-Speed Instrumentation Clocking
Precision instrumentation can use the SY89837UMG to create eight branches from one selected high-speed differential clock. The ultra-low-jitter, low-skew fanout function is useful when multiple converters, comparators, or acquisition sections require closely related clock edges. Maximum frequency is 2 GHz, and the LVPECL outputs deliver 800 mV with rise and fall times below 200 ps, enabling short trace routes in controlled printed-circuit layouts. The differential multiplexer is also applicable when two potential timing references must be selected. Confirm that each load presents the expected impedance and that the instrument's acquisition circuitry meets the LVPECL thresholds and timing budget before adopting the device.
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: SY89837UMG — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | SY89837U |
|---|---|---|
| Brand | Microchip Technology | Microchip Technology |
| Package | 32-VFQFN exposed pad | 32-VFQFN exposed pad - exact suffix confirmation required |
| Product Type | Clock fanout buffer with 2:1 input multiplexer | Precision 1:8 LVPECL fanout buffer with 2:1 RPE mux |
| Fanout Ratio | 1:8 | 1:8 |
| Maximum Frequency | 2 GHz | 2 GHz |
| Input Multiplexer | 2:1 differential | 2:1 differential |
| Input Logic Levels | CML, LVDS, PECL | CML, LVDS, PECL |
| Output Logic Level | 800 mV LVPECL | 800 mV LVPECL |
| Supply Voltage Range | 2.375 V to 3.6 V | 2.375 V to 3.6 V |
| Operating Temperature | -40°C to +85°C | -40°C to +85°C |
| Output Rise/Fall Time | Less than 200 ps | Less than 200 ps |
| Switchover Protection | Runt pulse eliminator | Runt pulse eliminator |
主な差別化要因
- Integrated protection against runt pulses during redundant clock switching （vs SY89837U)
- Eight 800 mV LVPECL outputs from one selected differential input （vs SY89837U)
- Broad input compatibility for redundant clock architectures （vs SY89837U)
設計ノート
Treat the SY89837UMG as a high-speed differential clock device. Route each input and output pair with matched geometry and a continuous reference plane, minimize stubs and layer transitions, and keep the multiplexer inputs symmetrical to avoid source-dependent timing differences. Use the manufacturer's package drawing and pin-description table for the 32-VFQFN land pattern, including the exposed-pad connection and thermal-via arrangement.
Validate input termination, biasing, and source amplitude against the manufacturer requirements for CML, LVDS, or PECL operation. Check the selected source's edge rate, duty cycle, and jitter at the actual receiver pins rather than at the oscillator. For the eight LVPECL outputs, confirm termination values, trace length balance, load capacitance, and downstream thresholds with the intended board construction.
Do not treat the SY89837UMG's 2:1 multiplexer as a generic logic multiplexer. Its special value is the runt pulse eliminator during redundant source switching. Reproduce the expected transition sequence in hardware, including source amplitude differences and receiver thresholds, and verify that no narrow invalid clock reaches downstream logic. Also confirm that the 2.375 V to 3.6 V supply range covers startup, steady-state, and tolerance conditions.
The exposed pad provides the primary path for heat removal from the 32-VFQFN package. Follow the manufacturer land-pattern guidance for exposed-pad vias and preserve enough surrounding copper for the intended switching activity. Because exact thermal resistance and total dissipation depend on the finished board, airflow, and clock activity, estimate junction temperature with the actual layout and operating conditions rather than assuming the package alone determines temperature.
コンプライアンス情報
The manufacturer product information identifies industrial-temperature operation from -40°C to +85°C but does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Confirm these attributes in the current manufacturer product documentation before regulated production use.
