SY89465UMY - 2:10 LVDS Clock Fanout | Microchip
料号： SY89465UMY ✓ 量产中SY89465UMY 概述
A clock multiplexer is a timing device that routes one of several input signals to a shared output path. Clock fanout extends one signal across multiple outputs so that all receivers see a closely related copy. The SY89465UMY combines these functions into one device: a 2:1 Runt Pulse Eliminator multiplexer first selects the required clock, and the 1:10 fanout then generates ten LVDS-compatible outputs. This integration reduces the number of separate clock-routing components required in a multi-load backplane or processor system.
The SY89465UMY operates from a 2.375 V to 2.625 V supply and supports input logic levels of CML, LVDS, and PECL. Its LVDS outputs use rise and fall times guaranteed to be less than 220 ps, as stated for the SY89465U family on the Microchip product page. The 2 GHz maximum frequency makes the device suitable for high-speed communications, networking, storage, and test-and-measurement clock trees.
The 44-VFQFN package provides 44 electrical positions and an exposed pad for thermal management in space-constrained designs. Microchip identifies the device as part of its Micrel Precision Edge high-speed product line. The combination of a runt-pulse-eliminating multiplexer and ten-output fanout allows a system designer to distribute a selected high-speed clock without using separate multiplexer and fanout stages.
Typical uses include network switch and router backplanes, telecommunications line cards, server clock distribution, high-speed test equipment, and clock trees for parallel data converters. The multiple output count supports several receivers connected at controlled distances, while the 2:1 selection function supports clock switching, redundancy, or source arbitration.
Careful layout is essential because LVDS clock signals depend on controlled differential impedance and short, symmetric routing. Place the decoupling capacitors close to the supply pins, route differential pairs over a continuous reference plane, and avoid introducing unmatched stubs. Confirm the output termination scheme and receiver loading against the system-level clock architecture before releasing the PCB layout.
This page combines the technical specifications, sourcing information, application context, and drop-in replacement analysis for the SY89465UMY. It also identifies design trade-offs that are not apparent from a distributor category listing, including fanout architecture, supported input standards, package thermal considerations, and practical LVDS routing constraints.
直接替换替代料： SY89465UMY ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
SY89465UMY-TR
✅ 直接替换📋 参考替代料（不在目录中）
SY89465UMGTR
✅ 直接替换📋 参考替代料（不在目录中）
SY89465U
✅ 直接替换📋 参考替代料（不在目录中）
SY89465UMY-TR-DG
✅ 直接替换📋 参考替代料（不在目录中）
SY89465UMY 规格参数
| Device Type | Clock Multiplexer IC with LVDS Fanout |
| Multiplexer Configuration | 2:1 Runt Pulse Eliminator Multiplexer |
| Fanout Configuration | 1:10 LVDS Fanout |
| Maximum Frequency | 2 GHz |
| Input Logic Levels | CML, LVDS, PECL |
| Output Logic Level | LVDS |
| Supply Voltage Range | 2.375 V to 2.625 V |
| Output Rise/Fall Time | Less than 220 ps |
| 工作温度范围 | -40 °C to +85 °C |
| 封装 | 44-VFQFN Exposed Pad, 44-MLF |
| 安装类型 | Surface Mount |
| 输出数量 | 10 |
| Number of Multiplexer Inputs | 2 |
| Product Line | Micrel Precision Edge |
SY89465UMY 44-vfqfn exposed pad, 44-mlf 引脚配置指南
SY89465UMY（44-vfqfn exposed pad, 44-mlf 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： SY89465UMY.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SY89465UMY 适用于 6 应用s: Network Switch Backplane Clock Distribution, Telecommunications Line Card Clock Trees, Parallel Data Converter Clocking, Server and Storage System Clock Trees, High-Speed Test and Measurement Equipment, Redundant Clock Source Selection.
Network Switch Backplane Clock Distribution
The SY89465UMY suits backplane clock trees that require one selected source to feed ten LVDS receivers. Its 2:1 Runt Pulse Eliminator multiplexer selects between two incoming clocks, while the 1:10 fanout creates ten LVDS-compatible outputs from the selected source. Operating up to 2 GHz, the device supports high-speed switching fabrics and line cards where a single reference must reach multiple serializers, PHYs, or fabric devices. The integrated architecture reduces the component count compared with a discrete multiplexer followed by a separate fanout. Board implementation still depends on controlled-impedance routing, receiver termination, and verification of the clock source's jitter and skew budget.
推荐
Telecommunications Line Card Clock Trees
Telecommunications line cards can use the SY89465UMY to select a primary or alternate clock and distribute it across ten LVDS loads. The 2:1 selection function supports source redundancy, while the runt-pulse-eliminating behavior helps prevent narrow pulse anomalies from propagating into the fanout section. Its stated operating range up to 2 GHz and 2.375 V to 2.625 V supply suit high-speed serial and parallel processing blocks. The ten outputs also allow clock distribution to multiple converters, transceivers, or fabric engines without duplicating the source-selection stage. Exact jitter, skew, and insertion-delay limits must be confirmed from the manufacturer datasheet for the deployed system topology.
推荐
Parallel Data Converter Clocking
The SY89465UMY can provide a selected low-jitter clock to multiple parallel data converters, sampling networks, or acquisition channels. Its 1:10 fanout supports ten destinations from one clock-selection point, which simplifies branch control when several converters must operate from the same source. The 2 GHz maximum frequency is suitable for high-speed digital conversion architectures, while CML, LVDS, and PECL input support allows the upstream source to use common differential signaling formats. The device is most useful when system skew must be controlled and a discrete fanout would add another stage. Source jitter, channel-to-channel skew, and the exact output timing relationship should be evaluated before assigning the ten outputs to critical converter sample clocks.
推荐
Server and Storage System Clock Trees
The SY89465UMY is applicable to server and storage systems that need clock selection followed by fanout to multiple interface controllers. Two input clocks can be presented to the 2:1 Runt Pulse Eliminator multiplexer, and the selected clock can be distributed to ten LVDS-compatible outputs. This arrangement can support switching among operating modes while preserving a single defined distribution point. The 44-VFQFN exposed-pad package keeps the implementation compact, and the 2.375 V to 2.625 V supply aligns with 2.5 V clocking environments. Designers should still consider return-loss effects over long PCB routes, ground partitioning around the multiplexer, and the jitter contribution of the upstream oscillator or PLL when establishing the final clock budget.
推荐
High-Speed Test and Measurement Equipment
High-speed test equipment often requires one source to clock several acquisition, pattern-generation, or comparison channels. The SY89465UMY combines source selection with ten-way LVDS fanout, avoiding a separate multiplexer and fanout in space-constrained instruments. Its 2 GHz capability and rise and fall times below 220 ps, as stated for the SY89465U family, suit high-speed stimulus and measurement architectures. Because instrument channels often have unequal cable or fixture loading, careful output assignment and controlled-impedance routing remain essential. The manufacturer documentation should be consulted for per-output timing, output current, and recommended termination details before establishing channel-to-channel skew limits for precision instruments.
推荐
Redundant Clock Source Selection
The SY89465UMY can select between two clock sources before distributing the chosen signal to ten loads, making it useful in systems that require source switching or redundancy. The Runt Pulse Eliminator function is intended to suppress runt-pulse conditions at the multiplexer stage, helping protect downstream receivers from narrow glitches on the selected clock. Its 2:1 selection and 1:10 fanout provide a compact implementation for dual-source clock trees. Source-switchover behavior, control timing, and system-level holdover requirements are not established by the distributor catalog information and should be confirmed in the manufacturer datasheet. Test both sources with representative loading and verify downstream lock acquisition before relying on automatic or manual switching.
推荐
推荐产品汇总
工程参考数据： SY89465UMY ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | SY89465UMY-TR | SY89465UMGTR | SY89465U | SY89465UMY-TR-DG |
|---|---|---|---|---|---|
| Package | 44-VFQFN Exposed Pad, 44-MLF | 44-VFQFN Exposed Pad, 44-MLF | 44-VFQFN Exposed Pad, 44-MLF | 44-VFQFN Exposed Pad, 44-MLF | 44-VFQFN Exposed Pad, 44-MLF |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Multiplexer Configuration | 2:1 Runt Pulse Eliminator Multiplexer | 2:1 Runt Pulse Eliminator Multiplexer | 2:10 Clock Mux Configuration | 2:1 Multiplexer with LVDS Fanout | 2:1 Runt Pulse Eliminator Multiplexer |
| Fanout Ratio | 1:10 LVDS Fanout | 1:10 LVDS Fanout | 2:10 Clock Mux Configuration | 1:10 LVDS Fanout | 1:10 LVDS Fanout |
| Maximum Frequency | 2 GHz | 2 GHz | 2 GHz | 2 GHz | 2 GHz |
关键差异点
- Integrated clock selection and ten-output distribution （对比 SY89465UMY-TR)
- High-speed LVDS output edge rate （对比 SY89465U)
- Multi-format high-speed input support （对比 SY89465UMGTR)
设计说明
Route every LVDS output as a tightly coupled differential pair over a continuous reference plane, and match the pair geometry to the board's controlled-impedance rules. Keep the two inputs, selected-clock path, and output lanes away from noisy switching nodes. Avoid stubs, test pads without termination planning, and right-angle transitions because these structures can create reflections that appear as clock-timing errors at the 2 GHz operating limit.
Decouple the 2.5 V supply locally and use a quiet return path for the clock circuitry. Place the bulk and high-frequency capacitors close to the device's supply and ground pins, then verify that the exposed pad is connected to the ground plane according to the manufacturer land pattern. Because a single low-noise clock rail can mix switching and sensitive logic currents, keep regulator and clock-supply connections separated where practical and check supply ripple at the device pins.
Confirm the receiver termination arrangement and output loading against the manufacturer application guidance before assigning all ten fanout outputs. Keep channel lengths balanced where channel-to-channel skew matters, and measure the selected input and fanout outputs with a high-impedance probe at the intended receiver locations. Edge rates below 220 ps make probe loading and fixture reflections more significant, so validate the complete clock path rather than relying only on source-side measurements.
Do not treat the SY89465UMY and SY89465UMY-TR as different electrical designs solely because their ordering codes differ. The published cross-reference describes consistent performance, terminals, and package, but the correct tape orientation, tray or reel configuration, and manufacturer ordering code must still match the assembly process. Also avoid assigning clock outputs without checking their intended fanout relationships and any unused-output handling specified in the manufacturer documentation.
合规信息
The product information identifies industrial-temperature operation from -40 °C to +85 °C but does not state RoHS, REACH, halogen-free, conflict-minerals, or automotive-qualification status. A non-AEC-Q100 timing device is not applicable to automotive qualification.
