SY89873LMG - 2 GHz LVDS Clock Divider | Microchip
MPN： SY89873LMG ✓ 啟用中SY89873LMG 概覽
A clock divider is a timing IC that reduces an input clock frequency by a controlled ratio while preserving the relationship between the source clock and derived outputs. Clock dividers and fanout buffers belong to the clock and timing IC hierarchy, where they support clock generation, distribution, frequency translation, and programmable timing in communication, networking, and digital processing systems. The SY89873LMG combines division with three LVDS outputs to distribute one divided clock across multiple loads.
Key features include support for AC- or DC-coupled differential inputs, a maximum output toggle frequency of 2.0 GHz, a maximum input frequency of 3.0 GHz, and internal input termination. The three-output architecture reduces the need for separate fanout stages, while the programmable divider allows a system clock to be translated to a lower frequency without introducing an unrelated free-running oscillator. Low-skew and low-jitter operation are central requirements for maintaining timing relationships across parallel LVDS clock domains.
The device accepts CML, LVPECL, HSTL, and LVDS input standards, allowing it to operate near many high-speed differential clock sources. Its 3.3 V supply and LVDS output interface place it between the clock-generation and receiver stages of a high-speed system. The internal termination feature helps control impedance at the differential input, but the input network and PCB transmission lines still require careful implementation to minimize reflections and maintain signal integrity.
Typical uses include clock division and fanout for communications equipment, network-interface subsystems, backplanes, and high-speed digital logic. It can also support clock-tree designs in industrial and test systems where a source clock must be divided before being distributed to multiple LVDS receivers. The device is particularly relevant where several destinations need a common divided clock and predictable relative timing.
For PCB implementation, place the SY89873LMG close to the source clock and route the differential input and LVDS outputs as controlled-impedance pairs. Keep the exposed-pad layout consistent with the manufacturer’s recommended thermal and land-pattern guidance. Confirm the selected divider ratio, termination arrangement, and output timing budget during system validation.
This product summary combines the manufacturer’s clock-function description with package, interface, frequency, and application context. It also provides selection guidance, design notes, and verified sourcing information to help engineers evaluate the SY89873LMG before integrating it into a precision LVDS clock tree.
直接替換替代品，適用於 SY89873LMG — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
SY89873LMG-TR
✅ 直接替換📋 參考替代品（不在目錄中）
SY89873L
✅ 直接替換📋 參考替代品（不在目錄中）
SY89230UMG-TR
✅ 直接替換📋 參考替代品（不在目錄中）
SY89840UMG
✅ 直接替換📋 參考替代品（不在目錄中）
SY89873LMG 規格
| Device Type | Programmable clock divider and fanout buffer |
| 供應電壓 | 3.3 V |
| Maximum Output Toggle Frequency | 2.0 GHz |
| Maximum Input Frequency | 3.0 GHz |
| Input Logic Standards | CML, LVPECL, HSTL, or LVDS differential input |
| Input Coupling | AC-coupled or DC-coupled |
| Output Logic Standard | LVDS |
| Fanout Ratio | 1:3 |
| Input Count | 1 differential input |
| Output Count | 3 LVDS outputs |
| Divider Ratio | Programmable |
| Internal Input Termination | Yes |
| Timing Characteristics | Low-skew and low-jitter operation |
| 封裝 | 16-pin QFN with exposed pad |
| Package Designation | 16-VFQFN exposed pad, 16-MLF |
| 安裝類型 | Surface mount |
| RoHS 狀態 | Compliant |
SY89873LMG 16-vfqfn exposed pad, 16-mlf 腳位配置指南
SY89873LMG（16-vfqfn exposed pad, 16-mlf 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： SY89873LMG.
請參閱 資料表 以查看完整腳位配置。
典型應用
SY89873LMG 適用於 6 應用s: Communications Clock Fanout, Network Interface Clock Tree, High-Speed Backplane Clock Distribution, Server and Storage Clocking, Industrial Control and Test Systems, FPGA and ASIC Clock Fanout.
Communications Clock Fanout
The SY89873LMG fits communications designs that derive one lower-frequency clock from a high-speed differential source and distribute it to three endpoints. Its inputs accept CML, LVPECL, HSTL, or LVDS signals, while its outputs use LVDS, allowing clock distribution to remain consistent across different logic families. The 2.0 GHz maximum output toggle frequency supports high-speed system timing, and the 1:3 fanout reduces the need for separate clock-buffer stages. Designers should verify the programmed divide ratio against the receiver’s timing budget and route every differential output as a controlled-impedance pair to preserve edge quality and minimize skew.
推薦
Network Interface Clock Tree
The SY89873LMG is useful in network-interface clock trees where a high-speed differential reference must be divided before distribution to multiple endpoint circuits. The programmable divider provides control over the derived frequency, while three LVDS outputs support clock delivery across a board or backplane. Input frequencies can reach 3.0 GHz and output toggle performance is guaranteed to 2.0 GHz, making the device relevant to demanding serial-interface architectures. The main design trade-off is that each LVDS branch requires correct source and receiver termination, matched impedance, and controlled pair routing to avoid reflections that increase deterministic jitter.
推薦
High-Speed Backplane Clock Distribution
The SY89873LMG can generate a common divided clock for backplane endpoints when a single differential source must feed multiple destinations. Its three LVDS outputs reduce clock-fanout depth and help maintain a consistent source-to-destination relationship, while the internal input termination supports implementation of the differential input network. The 3.3 V operating voltage and low-skew, low-jitter positioning are appropriate for high-speed digital clocking. Backplane engineers must account for connector loss, trace-length matching, receiver thresholds, and the skew budget across the entire path rather than treating the IC alone as the complete timing solution.
推薦
Server and Storage Clocking
The SY89873LMG is appropriate for server, storage, and accelerator subsystems that need a lower-frequency clock derived from a faster differential source and delivered to several logic groups. Programmable division lets firmware or control logic select an operating mode, and the three LVDS outputs can feed multiple clock consumers without adding a separate three-way distribution stage. Its maximum output toggle frequency of 2.0 GHz and support for several high-speed input standards provide useful range for system clock trees. Thermal and layout planning should preserve signal integrity by keeping the clock source, IC, and branch routing compact and electrically controlled.
推薦
Industrial Control and Test Systems
The SY89873LMG supports industrial control and test systems that synchronize several measurement, conversion, or processing blocks from one differential clock. A programmable divide ratio creates a lower clock related to the source, and three LVDS outputs distribute that clock while preserving consistent edge timing. The device can accept CML, LVPECL, HSTL, or LVDS sources, which simplifies integration around mixed high-speed logic. For reliable operation, the analog input amplitude and common mode must meet the manufacturer’s limits, and differential traces should include continuous return paths, appropriate termination, and matched geometry to minimize jitter and skew.
推薦
FPGA and ASIC Clock Fanout
The SY89873LMG is well suited to FPGA and ASIC clock fanout when an internal or transceiver-derived differential clock must be divided and delivered to several logic domains. Three LVDS outputs can feed compatible clock inputs without using separate fanout buffers, and the 1:3 ratio supports compact multi-destination clock trees. The 2.0 GHz maximum output toggle frequency covers high-performance logic timing requirements, while low-skew and low-jitter operation help preserve setup and hold margins. System designers should validate the selected divider ratio against the FPGA or ASIC clock-domain constraints and check whether the clock inputs require external termination or particular slew characteristics.
推薦
推薦產品摘要
工程參考資料，適用於 SY89873LMG — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | SY89873LMG-TR | SY89873L | SY89230UMG-TR | SY89840UMG |
|---|---|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 16-VFQFN exposed pad, 16-MLF | 16-VFQFN exposed pad, 16-MLF | 16-VFQFN exposed pad, 16-MLF | QFN-16 | QFN-16 |
| Device Function | Programmable clock divider and 1:3 LVDS fanout buffer | Programmable clock divider and 1:3 LVDS fanout buffer | Programmable clock divider and LVDS fanout buffer | Compact frequency-divider module | Low-voltage high-frequency logic selector |
主要差異化特點
- Combines programmable division with three LVDS outputs (對比SY89840UMG)
- Accepts four differential clock standards (對比SY89230UMG-TR)
- Guarantees 2.0 GHz output toggle performance (對比SY89230UMG-TR)
設計說明
Route the differential input and all three LVDS outputs as controlled-impedance pairs with continuous reference planes and consistent pair spacing. The input may be AC- or DC-coupled and supports CML, LVPECL, HSTL, or LVDS, but the source amplitude and common-mode voltage must remain within the manufacturer’s limits. Use the internal termination configuration specified by the datasheet rather than adding an incompatible parallel termination.
Place the SY89873LMG near the clock source and minimize the input route before the first fanout branch. Keep the three output branches electrically similar where timing skew matters, and match differential pair geometry through layer transitions and connectors. Avoid stubs, excessive vias, and splits beneath the differential lines because these structures increase reflections and can degrade jitter even when the IC operates within its frequency limits.
Implement the exposed pad according to the manufacturer’s land-pattern and thermal guidance, including the recommended via arrangement and an uninterrupted ground connection. Although the SY89873LMG is a clock-management IC rather than a power converter, supply routing, regulator proximity, and local copper can still influence junction temperature and clock-edge stability. Verify the assembled board across the expected ambient range and maximum clock activity.
Do not select a replacement from package appearance alone. A valid substitution must match the input logic standard, input coupling, supply voltage, divider control, LVDS output implementation, output count, and timing limits. In particular, SY89230UMG-TR and SY89840UMG are related QFN-16 clock devices whose divider or logic functions may differ from the SY89873LMG, so board-level substitution requires a manufacturer pin-by-pin and timing review.
合規資訊
RoHS compliance is identified for the SY89873LMG. No manufacturer declaration for REACH, AEC-Q100 qualification, lead-free status, halogen-free status, or conflict-minerals compliance was identified.
