SY87729LHI - 365MHz Fractional-N Clock Synthesizer | Microchip
MPN: SY87729LHI ✓ NakahandaSY87729LHI Ulas
A clock synthesizer is a clock-and-timing semiconductor that converts one or more reference inputs into synchronized output clock signals. Fractional-N architectures divide an integer reference frequency by an integer and a fractional ratio, allowing fine output-frequency resolution without changing the crystal reference itself. Within the broader semiconductor hierarchy, this device is a clock generator and timing IC used to support communication infrastructure, network equipment, and data-transmission systems.
The verified product information identifies a 27 MHz reference input, operation up to 365 MHz, one output, PECL input and output interfaces, and a narrow 3.15 V to 3.45 V operating-supply range. Its operating temperature range is -40°C to 85°C. These characteristics make the device applicable where a conventional integer-N divider cannot provide the required output-frequency resolution.
The fractional-N synthesis architecture supports programmable clock ratios while retaining an externally supplied reference. PECL signaling is intended for high-speed clock distribution in telecommunications equipment, although interface amplitude, termination, and routing require board-level verification. The 32-pin TQFP exposed-pad package provides a defined thermal path when the device is mounted with its exposed pad soldered according to the manufacturer land pattern.
Typical uses include line-card clock generation, Ethernet and Fibre Channel interface modules, SONET or SDH transport equipment, and ATM-based network systems. In each case, the 365 MHz maximum output supports high-rate clock generation while the fractional division capability allows the output frequency to be adjusted more closely to the system requirement than an integer-only divider.
Designers should verify all divider settings, output-drive strength, jitter, reference purity, and loop-bandwidth requirements against the manufacturer datasheet before production release. The 3.15 V to 3.45 V supply range requires a regulator or rail capable of maintaining the specified voltage, and the exposed pad needs careful PCB layout for effective heat removal.
This page consolidates the verified SY87729LHI operating limits, package information, cross-reference results, procurement caveats, and engineering guidance. It also separates confirmed manufacturer-grade facts from unavailable details so designers can identify what must still be checked in the official SY87729LHI datasheet before schematic release.
Mga alternatibo na pwedeng ilagay na SY87729LHI — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Variante sa Seri na ito
Katulad na modelo sa serye na katugma sa pagpasok SY87729LHI (parehas na form factor at footprint) — pagkakaiba sa Package.
SY87729LHY
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →SY87729LHI Mga Spesipikasyon
| Product Type | Fractional-N clock synthesizer IC |
| Reference Input Frequency | 27 MHz |
| Maximum Output Frequency | 365 MHz |
| Bilang ng Outputs | 1 output |
| Input Interface | PECL |
| Output Interface | PECL |
| Operating Supply Voltage Range | 3.15 V to 3.45 V |
| Hanay ng Temperature na Operasyon | -40°C to 85°C |
| Packhaging | 32-pin TQFP exposed pad |
| Device Category | Clock generator |
| Synthesis Architecture | Fractional-N |
| Minimum Operating Supply Voltage | 3.15 V |
| Maximum Operating Supply Voltage | 3.45 V |
| Minimum Operating Temperature | -40°C |
| Maximum Operating Temperature | 85°C |
| Exposed Thermal Pad | Yes |
Gabay sa Pin Configuration ng SY87729LHI 32-pin tqfp exposed pad
Pin configuration para sa SY87729LHI (32-pin tqfp exposed pad package). Ang pagnunumero ng pin, mga function, at connection diagram ay tinukoy sa datasheet ng manufacturer. Sumangguni dito para sa eksaktong footprint at mga alituntunin sa soldering.
Wala ng detalyadong pinout data na magagamit para sa SY87729LHI.
Sumangguni sa datasheet para sa buong pin configuration.
Tipikal na mga Gamit
SY87729LHI ay nararapat para sa 6 aplikasyons: Ethernet Line-Card Clock Generation, Fibre Channel Interface Clocking, SONET and SDH Transport Modules, ATM Network Equipment, Telecommunications Backplane Clocking, Instrumentation and Test Equipment Clocks.
Ethernet Line-Card Clock Generation
The SY87729LHI fits Ethernet line-card clock generation because it combines a 27 MHz reference input with fractional-N synthesis up to 365 MHz and one PECL output. A fractional divider can bring the reference-derived output closer to a required communication clock than an integer-only divider. The device should be placed beside the transceiver or ASIC that consumes the clock, with short controlled-impedance routes and terminations matched to the PECL interface. Because only one output is verified, designs needing multiple independent clocks require another synthesis or distribution stage. Confirm divider ratios, output amplitude, jitter, and reference specifications in the official datasheet before using it in a production Ethernet interface.
Inirekomenda
Fibre Channel Interface Clocking
The SY87729LHI is applicable to Fibre Channel interface clocking because its fractional-N architecture supports flexible frequency division from a 27 MHz reference to as much as 365 MHz. That capability can support a single high-speed serial interface clock without replacing the reference source whenever a fractional ratio offers sufficient resolution. The PECL output is intended for high-speed clock distribution, but the exact drive level and receiver termination must be checked against the transceiver interface. PCB routing should minimize stub length and preserve controlled impedance. The supplied data does not state RMS jitter or phase-noise limits, so those specifications must be verified before sign-off for Fibre Channel compliance.
Inirekomenda
SONET and SDH Transport Modules
The SY87729LHI fits SONET and SDH transport modules that derive an internal clock from a fixed 27 MHz reference. Fractional-N synthesis permits a more closely tailored output than integer division alone, while the verified 365 MHz maximum output covers high-speed timing requirements. Its 3.15 V to 3.45 V operating range calls for a local regulator with adequate transient performance, and the exposed thermal pad requires proper PCB copper and thermal vias. Before deployment, verify the required line-rate reference plan, jitter transfer, wander behavior, and clock-quality margins. Those parameters are not present in the supplied data and cannot be inferred from the frequency range alone.
Inirekomenda
ATM Network Equipment
The SY87729LHI is identified in verified product information as an ATM fractional synthesizer, making it relevant to legacy and specialized ATM network equipment. A 27 MHz reference and programmable fractional ratio allow the interface clock to be aligned with the system timing plan without changing the physical reference source. The single PECL output can feed a local endpoint when additional clock branches are not required. Designers should treat this use as an application category rather than a standards-compliance claim: output jitter, wander, reference purity, and fail-safe behavior remain unspecified in the supplied records and must be checked against the ATM system requirement.
Inirekomenda
Telecommunications Backplane Clocking
The SY87729LHI can support a telecommunications backplane clock node when the design requires local synthesis from a 27 MHz reference. Its fractional-N operation offers finer output-frequency selection than integer-N division, and the single 365 MHz-capable PECL output can feed a selected load or distribution stage. Placement is especially important: the clock route should be short, referenced to a continuous ground plane, and terminated according to the verified PECL interface requirements. The device's 3.15 V to 3.45 V range and -40°C to 85°C operating range must be accommodated across the enclosure environment. Because skew, jitter, and channel-count requirements were not supplied, they require explicit validation before installation in a backplane clock tree.
Inirekomenda
Instrumentation and Test Equipment Clocks
The SY87729LHI may be used in instrumentation or test equipment that needs a programmable rational clock derived from a stable 27 MHz reference. Fractional-N synthesis provides practical frequency selection flexibility, and the 365 MHz maximum output is suitable for driving high-speed digital subsystems when the required jitter and drive parameters meet the system specification. The fixed 3.15 V to 3.45 V supply range should be regulated close to the device, while decoupling and return paths must follow the official layout guidance. The supplied data does not provide tuning range, programming interface details, phase-noise curves, or calibration behavior, so suitability for precision measurement cannot be confirmed without those documents.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for SY87729LHI — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | SY87729LHY |
|---|---|---|
| Brand | Microchip Technology | Microchip Technology |
| Package | 32-pin TQFP exposed pad | 32-pin TQFP exposed pad |
| Product Type | Fractional-N clock synthesizer IC | Clock generator |
| Reference Input Frequency | 27 MHz | 27 MHz |
| Maximum Output Frequency | 365 MHz | 365 MHz |
Pangunahing mga Pagkakaiba
- Fractional-N clock synthesis from a 27 MHz reference (kumpara saSY87729LHY)
- Single high-speed PECL output (kumpara saSY87729LHY)
- Defined industrial temperature range (kumpara saSY87729LHY)
Talaan ng Disenyo
The SY87729LHI operates from 3.15 V to 3.45 V, so the supply rail must remain inside that interval under temperature, tolerance, and transient conditions. Place the device's decoupling capacitors at the supply and ground pins using the official recommended layout. Avoid routing the 3.3 V rail through long or shared paths susceptible to clock-edge noise. Absolute maximum voltage, current consumption, power dissipation, and allowable decoupling values are not present in the supplied data and must be obtained from the manufacturer datasheet.
The 32-pin TQFP includes an exposed pad, but its electrical connection and recommended solder pattern must be confirmed from the official package drawing. Implement the land pattern with adequate ground-plane connection and thermal vias, then assess copper spreading under the highest expected ambient temperature and output activity. A thermal estimate cannot be produced from the supplied data because power dissipation, thermal resistance, and exposed-pad geometry are not provided. Validate the assembled thermal path using the manufacturer guidelines rather than relying on the nominal package name alone.
Treat the 27 MHz reference and PECL clock output as high-speed signals. Use short routes, a continuous reference plane, manufacturer-recommended termination, and minimal test-point stubs. Maintain a defined return path beneath each clock trace and keep switching power-supply paths away from the reference network. The supplied data confirms PECL interfaces but does not provide input thresholds, output amplitude, edge rate, or recommended termination values, so those details must be taken directly from the official datasheet before layout release.
Do not substitute a similar ordering code solely because its frequency and package descriptions match. The SY87729LHY is reported as a drop-in candidate, but qualification grade, programming compatibility, lifecycle status, divider implementation, and electrical limits must still be reconciled with the original SY87729LHI design. The supplied data does not contain a complete pinout, register map, jitter specification, or programming procedure. Treat the cross-reference result as a starting point for engineering review, not as a complete production-equivalence approval.
Impormasyon ng Pagsunod sa Kautusan
The supplied web data contains no verified environmental or material-compliance declarations for the SY87729LHI. Compliance status must be confirmed using the exact manufacturer ordering code and current material-declaration records. The part is a clock-and-timing IC rather than an automotive-qualified device in the supplied evidence.
