SY89426JY - 622.08MHz SONET Clock Synthesizer | Microchip
N.º de pieza: SY89426JY ✓ ActivoSY89426JY Descripción general
A clock synthesizer is a timing IC that generates, multiplies, or distributes clock signals according to a defined frequency relationship. In the broader semiconductor hierarchy, this product is a clock and timing IC, then a frequency synthesizer, and finally a SONET line-rate clock-generation component. This classification matters because telecom designs require deterministic relationships among reference, payload, and line clocks rather than a general-purpose oscillator. The SY89426JY targets the 51.84MHz, 155.52MHz, 311.04MHz, and 622.08MHz SONET domain through its supported generation function.
Verified source data identifies one clock circuit, no PLL, a TTL reference input, PECL and TTL outputs, a maximum frequency of 622.08MHz, and a 28-LCC package. The absence of a PLL is a defining architectural constraint: the synthesizer relies on a supplied reference rather than a phase-locked loop. Distributor descriptions further identify the part as lead-free and intended for industrial-temperature operation, but the supplied evidence does not expose voltage limits, supply current, jitter, output levels, pin names, or complete timing tables.
The device is suitable for SONET OC-3 and OC-12 transport equipment, optical-network terminals, line cards, clock-distribution modules, and test equipment that require a 622.08MHz clock. Its multiple logic interfaces allow integration where the next stage accepts PECL or TTL. Because high-speed edges and propagation delays can affect timing integrity, the PCB must provide controlled impedance, short traces, solid return paths, and clean separation between clock and data or noisy power circuitry.
When designing around SY89426JY, verify every supply rail, logic threshold, decoupling value, and output termination against the manufacturer datasheet before schematic release. Do not assume generic PECL or TTL termination because device-specific output topology and board-level loading are not present in the supplied data. Differential-clock standards, such as the CML interface referenced by the retrieved datasheet result, may not be available from this part even though CML is common in related SONET devices.
This page combines verified distributor specifications, source-qualified data gaps, application context, and replacement constraints. It also distinguishes a true drop-in replacement from a merely functional clock synthesizer, since same-package status, pin compatibility, electrical ranges, and lifecycle availability must all be confirmed before substitution.
Alternativas directas para SY89426JY — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
No hay alternativas directas disponibles para este producto.
Solicitar alternativasSY89426JY Especificaciones
| Product Type | Clock/Frequency Synthesizer IC |
| Maximum Frequency | 622.08 MHz |
| Input Frequency Range | 38.88 MHz to 77.76 MHz |
| Input Interface | TTL |
| Output Interface | PECL, TTL |
| Number of Circuits | 1 |
| PLL | No |
| SONET Application | OC-12/OC-3 Clock Synthesizer |
| Encapsulado | 28-LCC (J-Lead) |
| Recuento de pines | 28 pins |
| Tipo de montaje | Surface mount |
| Temperature Grade | I Temp |
| Lead-Free Status | Lead-free |
| Series | Precision Edge |
Guía de configuración de pines de SY89426JY 28-lcc (j-lead)
Configuración de pines para SY89426JY (encapsulado 28-lcc (j-lead)). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para SY89426JY.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
SY89426JY es adecuado para 6 aplicacións: SONET OC-12 Line Cards, OC-3 Optical Transport Modules, Telecommunications Clock Distribution, Optical Network Terminals, Telecom Test Equipment, Legacy Network Upgrade Platforms.
SONET OC-12 Line Cards
The Microchip Technology SY89426JY fits an OC-12 line-card clocking stage because its verified input range is 38.88MHz to 77.76MHz and its maximum output frequency is 622.08MHz. It can derive the high-rate SONET clock needed by optical transport and timing-recovery blocks without an internal PLL. Place it close to the line-rate receiver or transmitter interface, and provide controlled-impedance routing for its PECL or TTL clock output. The principal design trade-off is that the device contains no PLL, so the reference signal itself must meet the frequency stability and noise expectations of the SONET interface.
Recomendado
OC-3 Optical Transport Modules
The SY89426JY is suitable for OC-3 transport modules that require a 622.08MHz-class clock derived from a lower SONET reference. Its single-circuit, no-PPLL architecture gives designers a straightforward frequency-conversion block when the source clock is already clean and stable. The TTL reference input supports integration with compatible digital timing logic, while the documented PECL and TTL outputs provide interface choices for downstream circuitry. Layout must keep clock traces short, provide an uninterrupted ground reference, and use terminators selected from the actual output topology specified by the manufacturer.
Recomendado
Telecommunications Clock Distribution
For telecommunications clock-distribution boards, the SY89426JY can centralize generation of up to 622.08MHz clocks from a 38.88MHz-to-77.76MHz reference. Its PECL and TTL outputs let an engineer match different downstream logic interfaces, subject to the voltage and termination details in the datasheet. Because the device has no PLL, multiple boards must still share a suitably disciplined source rather than relying on this IC to correct long-term reference drift. Validate output timing and jitter against each recipient IC before committing to a fanout topology.
Recomendado
Optical Network Terminals
The SY89426JY can support clock generation inside an optical network terminal that terminates or transports SONET OC-3/OC-12 streams. Its maximum 622.08MHz output aligns with the high-speed clocking needs of contemporary line-card datapaths, while the 28-LCC package supports equipment with legacy leaded-component layouts. The design should separate the clock path from switching power nodes and use a defined reference plane beneath high-speed traces. Unverified jitter and output-level specifications must be obtained before release, especially when the terminal uses cascaded retimers or threshold-sensitive logic.
Recomendado
Telecom Test Equipment
The SY89426JY is applicable to SONET test equipment that must reproduce a predictable high-rate reference-clock relationship. Feeding a supported 38.88MHz-to-77.76MHz TTL source produces a clock capable of reaching 622.08MHz, enabling line-rate interface tests without relying on a general-purpose signal generator for every operating mode. The no-PLL design reduces circuitry when the test system already supplies an accurate reference. Engineers should still budget for connector, cable, fixture, and return-path effects because the supplied evidence does not specify AC timing margins or output jitter.
Recomendado
Legacy Network Upgrade Platforms
The SY89426JY can be used when maintaining or cloning a legacy 28-LCC telecom design rather than starting a new high-density SONET platform. Existing boards may depend on a non-PLL clock synthesizer that accepts a 38.88MHz-to-77.76MHz reference and provides PECL or TTL outputs up to 622.08MHz. In such a design, the safest replacement is an exact-ordering or manufacturer-approved substitute with verified land pattern and pin mapping. The package drawing, schematic symbol, and timing characteristics must be checked together; matching only the maximum frequency does not establish interchangeability.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para SY89426JY — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Notas de diseño
Treat the 622.08MHz clock as a controlled-impedance signal rather than a general-purpose low-frequency net. Use the shortest practical route, a continuous reference plane, minimized stubs, and terminators selected from the device's actual output schematic. The supplied sources label the outputs PECL and TTL but do not provide voltage levels or termination values, so do not assume that the same network suits both interfaces.
Place the SY89426JY near the circuit that consumes its highest-frequency clock, while keeping the 38.88MHz-to-77.76MHz reference path away from switching inductors and high-current return paths. Route over an uninterrupted ground or supply plane with no plane splits beneath clock traces. Obtain the 28-LCC mechanical drawing before placing lands because the verified snippets do not provide pitch, body size, or footprint details.
Do not infer pin compatibility from the J-Lead or PLCC description alone, and do not confuse the SY89426JY with SY89426JY-TR without checking the ordering code. The supplied data does not establish whether the -TR suffix changes temperature grade or shipment packaging. Before substitution, compare every pin, supply rail, input threshold, output interface, frequency limit, and lifecycle status against the current Microchip or Micrel documentation.
Información de cumplimiento
The verified Jotrin listing identifies SY89426JY as lead-free. RoHS, REACH, halogen-free, conflict-minerals, and AEC-Q100 data were not supplied, so those statuses remain unknown or not applicable rather than assumed.