SY87739LHG - 729 MHz Fractional-N Synthesizer | Microchip Technology
MPN: SY87739LHG ✗ انتهى عمره الإنتاجيSY87739LHG نظرة عامة
A fractional-N frequency synthesizer is a clock-generation IC that uses a phase-locked loop to produce an output frequency derived from a reference clock. Its fractional division capability permits frequency synthesis between integer division ratios, making this device category useful when an exact output frequency is required without changing the external reference. In the system hierarchy, the SY87739LHG is a PLL-based clock synthesizer, a specialized member of clock and timing integrated circuits and a semiconductor.
The key documented features are a maximum output frequency of 729 MHz, differential PECL input and output interfaces, a 1:1 input-to-output ratio, and operation from a 3.3 V supply identified in the available product data. The listed frequency range extends from 10 MHz to 729 MHz. Its differential clocking architecture is intended to support high-speed data transport systems where signal integrity and clock quality are important design considerations.
The SY87739LHG belongs to Microchip Technology's AnyClock family and uses a fractional-N synthesis architecture. The available product listing identifies the PLL feature and one output circuit. The 32-pin TQFP package with an exposed pad provides a defined surface-mount footprint for equipment requiring high-frequency clock generation in a moderately compact package.
Typical applications include Ethernet line cards, Fibre Channel systems, SONET/SDH transport equipment, ATM networks, and other high-performance data transport platforms. In these systems, the synthesizer can establish a required internal operating frequency from a stable reference while supporting high-speed differential clock distribution. Equipment designers should also account for reference quality, loop bandwidth, jitter, supply integrity, and output termination.
A key design consideration is that the listed device status is obsolete. Existing equipment can continue to use the documented SY87739LHG configuration, but new designs should not assume current production availability. The 7 x 7 mm exposed-pad package also requires a PCB footprint and thermal design consistent with the manufacturer's package drawing, particularly when the adjacent circuitry or exposed pad is used for heat removal.
This page combines the verified distributor and manufacturer-listing information with application guidance, lifecycle context, a specification-gap inventory, and transparent replacement analysis. Because the supplied cross-reference results identify search tools but do not name a verified pin-compatible substitute, it does not present unverified parts as drop-in replacements.
بدائل مباشرة لـ SY87739LHG — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
لا تتوفر بدائل متوافقة تمامًا لهذا المنتج.
اطلب بدائلSY87739LHG المواصفات
| Product Type | Fractional-N frequency synthesizer |
| Series | AnyClock |
| Maximum Output Frequency | 729 MHz |
| Minimum Frequency | 10 MHz |
| Input Interface | Differential PECL |
| Output Interface | Differential PECL |
| عدد المخارج | 1 output |
| Input-to-Output Ratio | 1:1 |
| Differential Input | Yes |
| Differential Output | Yes |
| جهد التغذية | 3.3 V |
| PLL | Yes |
| Number of Circuits | 1 |
| العلبة | 32-TQFP-EP (7 x 7 mm) |
| عدد الأطراف | 32 pins |
| نوع التركيب | Surface mount |
| Primary Applications | Ethernet, Fibre Channel, SONET/SDH, and ATM |
| Part Status | Obsolete |
دليل تكوين أطراف SY87739LHG 32-tqfp-ep (7 x 7 mm)
تكوين الأطراف لـ SY87739LHG (حزمة 32-tqfp-ep (7 x 7 mm)). يتم تعريف ترقيم الأطراف والوظائف ومخططات التوصيل في ورقة البيانات الفنية من الشركة المصنعة. راجعها للحصول على البصمة الدقيقة وإرشادات اللحام.
لا تتوفر بيانات مفصلة لمخطط التوصيلات لـ SY87739LHG.
راجع ورقة البيانات للحصول على تكوين الأطراف الكامل.
التطبيقات النموذجية
SY87739LHG مناسب لـ 6 التطبيقs: Ethernet Data Transport Equipment, Fibre Channel Clocking, SONET/SDH Transport Systems, ATM Network Interface Equipment, High-Speed Serial Backplane Clocking, Industrial Network Interface Cards.
Ethernet Data Transport Equipment
The SY87739LHG is suitable for Ethernet equipment requiring a low-jitter, high-frequency clock derived from a stable reference. Its documented maximum output of 729 MHz and differential PECL interface place it within the operating class of high-speed data transport systems, while the fractional-N architecture supports synthesis between integer division ratios. In a line-card design, the device can generate the timing required by a serial interface or digital processing section when configured with the appropriate reference and loop settings. The design must still validate reference phase noise, output jitter, clock termination, and margin against the Ethernet PHY or serializer requirements.
Fibre Channel Clocking
The SY87739LHG is identified as a clock synthesizer for Fibre Channel and related high-speed transport systems. A differential PECL output provides a suitable physical signaling form for many legacy high-speed designs, while the 729 MHz maximum output allows the synthesizer to support demanding clock-generation points. The fractional-N behavior can help engineers create a required clock from a fixed reference without changing that reference frequency. Actual deployment requires a complete assessment of accumulated jitter, reference-to-output isolation, supply sensitivity, and the timing requirements of the Fibre Channel transceiver or controller being clocked.
SONET/SDH Transport Systems
SONET/SDH equipment commonly depends on precise internal timing for high-speed line processing, making the documented SY87739LHG use case directly relevant. Its fractional-N synthesizer architecture, differential PECL interfaces, and 729 MHz upper frequency provide a foundation for generating a transport-derived operating clock from a stable reference. A telecom-oriented implementation must include reference-quality analysis, loop-bandwidth review, loss-of-reference behavior, and compliance testing under the applicable system specifications. Those detailed jitter and timing limits are not present in the supplied excerpts and should be taken from the complete manufacturer documentation and relevant interface standards.
ATM Network Interface Equipment
The SY87739LHG is explicitly associated with ATM networks and can serve as the timing element in legacy or maintenance-oriented transport hardware. Its 1:1 input-to-output ratio, differential PECL interface, and output frequency capability up to 729 MHz support the clocking needs of high-performance communication equipment when configured correctly. For an ATM interface design, engineers should verify the required cell-processing clock, upstream timing relationship, and reference architecture. Because the component is obsolete, procurement traceability and long-term maintenance support are as important as nominal frequency capability when deciding whether to reuse it in a new ATM platform.
High-Speed Serial Backplane Clocking
The 729 MHz maximum output and differential PECL output make the SY87739LHG applicable to high-speed serial backplane clock distribution in equipment already designed around this family. A board designer can use the fractional-N output to create a required internal clock while retaining a fixed external reference, and the differential interface helps reduce sensitivity to common-mode noise. Practical implementation requires controlled-impedance routing, correct source and load termination, separation from noisy data paths, and thermal awareness of the exposed-pad package. The complete clock-tree budget must be evaluated for additive jitter and power-supply rejection because those values are not included in the supplied source excerpts.
Industrial Network Interface Cards
Industrial interface cards can use the SY87739LHG when an existing platform requires a 729 MHz-capable fractional-N clock with differential PECL signaling. The part's documented Ethernet and data-transport positioning supports this use, and the exposed-pad 32-TQFP package permits integration into a conventional multilayer PCB. However, industrial longevity requirements make the obsolete status a significant constraint. New equipment should generally use an active alternative with verified long-term availability, while maintenance of installed cards may justify continued use only with authorized sourcing, traceability, and thermal verification of the exposed-pad land pattern.
بيانات مرجعية هندسية لـ SY87739LHG — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج |
|---|---|
| Package | 32-TQFP-EP (7 x 7 mm) |
| Brand | Microchip Technology |
| Product Type | Fractional-N frequency synthesizer |
| Maximum Output Frequency | 729 MHz |
| — | 10 MHz |
| Supply Voltage | 3.3 V |
| Input Interface | Differential PECL |
| Output Interface | Differential PECL |
| Number of Outputs | 1 output |
| Lifecycle Status | Obsolete |
أبرز الفروقات
- Documented high-frequency fractional-N clock synthesis (مقابلNo verified alternative MPN)
- Differential clock interface (مقابلNo verified alternative MPN)
- Defined surface-mount footprint and thermal land (مقابلNo verified alternative MPN)
ملاحظات التصميم
Route the differential PECL clock as a controlled-impedance pair and keep it away from switching nodes and high-current return paths. Place termination close to the receiving device and use matched-length routing so the differential signal remains well behaved at 729 MHz. The supplied evidence does not include the complete pinout or recommended termination values, so these must be taken from the manufacturer documentation rather than inferred from the interface name.
Treat the exposed pad as part of the thermal and electrical design of the 32-TQFP-EP footprint. Use the package drawing and land-pattern guidance to determine whether the pad is connected to a supply or ground plane and whether a thermal via array is required. Because operating-temperature limits, power dissipation, and theta_JA are absent from the supplied data, a thermal calculation cannot be completed without the full datasheet and the actual board construction.
Do not substitute a broadly similar PLL solely because its output frequency and supply voltage appear close. A genuine replacement must preserve the 32-TQFP-EP footprint, pin functions, reference-input requirements, differential PECL levels, fractional-N programming method, output configuration, and relevant timing performance. The supplied cross-reference results contain tools but no verified replacement MPN, and the target is obsolete, making accidental substitution especially risky.
Provide a clean 3.3 V supply and follow the manufacturer's recommended input and output decoupling arrangement. Reference-clock quality can dominate synthesizer jitter, so use a low-noise source and short, well-controlled routing between the reference source and the device. The verified excerpts do not provide supply-noise rejection, reference amplitude, or capacitor recommendations, so those values must be confirmed in the full manufacturer datasheet before implementation.
معلومات الامتثال
The supplied verified text does not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals compliance for the SY87739LHG. No compliance claim has been inferred from the manufacturer name, package type, or obsolete status.
