SY89426JI - 622.08MHz SONET Clock Synthesizer | Microchip
料号： SY89426JI ✗ 停产SY89426JI 概述
A clock synthesizer is a timing IC that derives one or more internally regulated clock outputs from an external reference. Clock synthesizers belong to the clock and timing IC hierarchy, where they support communication links, network equipment, and test systems by distributing frequencies with controlled phase and jitter. In a SONET design, accurate clocks are essential because transmit and receive hardware must process high-speed serial data within defined timing margins.
The SY89426JI provides a single-chip source for both 622.08 MHz and 155.52 MHz clock frequencies. The verified device description identifies SONET-compliant jitter performance of 0.01 UI. Differential PECL at 622.08 MHz is suited to high-speed serial links, while the single-ended PECL output at 155.52 MHz supports parallel or lower-rate clocking requirements. TTL/CMOS-compatible inputs and a reference output simplify integration with external oscillators and system clock-distribution networks.
Available verified data does not specify the complete electrical limits, supply-voltage range, power dissipation, temperature range, or detailed pin assignments. Those parameters remain marked as data-needed rather than inferred from the device category. Likewise, no manufacturer datasheet URL appears in the supplied search results, so a distributor or indexed datasheet page is retained only as a source reference rather than represented as an official Microchip PDF.
Typical uses include SONET optical network equipment, telecommunications line cards, high-speed clock-distribution assemblies, and instrumentation that needs related OC-12 and OC-3 clock domains. The principal design consideration is interface compatibility: downstream circuits must support differential or single-ended PECL levels, and any unused output or supply pins must be terminated exactly as directed by the complete datasheet.
This product page consolidates the verified clock frequencies, logic families, SONET jitter claim, package format, source links, and engineering cautions. It also distinguishes documented functions from unspecified parameters, helping designers evaluate the SY89426JI without converting category-level assumptions into unsupported component specifications.
直接替换替代料： SY89426JI ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料SY89426JI 规格参数
| Device Type | Clock/Frequency Synthesizer IC |
| Primary Clock Frequency | 622.08 MHz |
| Secondary Clock Frequency | 155.52 MHz |
| 622.08 MHz Output Configuration | Differential PECL |
| 155.52 MHz Output Configuration | Single-ended PECL |
| Input Compatibility | TTL/CMOS-compatible |
| Reference Output | Available |
| Jitter Performance | 0.01 UI, SONET compliant |
| Target Standards | SONET OC-12 and OC-3 |
| 封装 | 28-LCC (J-Lead) |
| 安装类型 | Surface Mount |
| 引脚数量 | 28 pins |
SY89426JI 28-lcc (j-lead) 引脚配置指南
SY89426JI（28-lcc (j-lead) 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： SY89426JI.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SY89426JI 适用于 6 应用s: SONET OC-12 Optical-Line Clocking, SONET OC-3 Line-Card Timing, Telecommunications Backplane Clock Distribution, High-Speed Test and Measurement Equipment, Optical Transport Module Clocking, Industrial Communication Timing Reference.
SONET OC-12 Optical-Line Clocking
The SY89426JI fits an OC-12 clock tree because it generates the documented 622.08 MHz differential PECL output required by high-speed SONET equipment and reports SONET-compliant jitter performance of 0.01 UI. Place the device near the master reference distribution point, route the 622.08 MHz pair on controlled-impedance PCB traces, and follow the complete datasheet for PECL termination. The second 155.52 MHz single-ended PECL output can support a related lower-rate clock domain. System-level compliance still depends on reference quality, trace loss, loading, power integrity, and measurement setup.
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SONET OC-3 Line-Card Timing
The SY89426JI is suitable as a single-chip source for both 622.08 MHz and 155.52 MHz clocks in an OC-3 timing architecture. The 622.08 MHz output is differential PECL, while the 155.52 MHz output is single-ended PECL, allowing one device to feed interfaces with different physical clock-output formats. Engineers should use the manufacturer documentation to confirm reference configuration, output-enable states, and supply requirements. PCB implementation must preserve signal integrity at the differential output and provide the biasing and termination required by PECL receivers.
推荐
Telecommunications Backplane Clock Distribution
Use the SY89426JI when a telecommunications backplane needs locally derived SONET-related clocks close to high-speed circuitry. Its dual-frequency capability reduces the number of distinct clock sources, while the differential 622.08 MHz output helps maintain signal integrity over a controlled-impedance route. The 155.52 MHz single-ended PECL output is available for compatible downstream logic. Because the verified data does not provide drive-strength, output-disable, or supply details, the complete datasheet must be checked before setting trace lengths, receiver terminations, and backup-clock switching behavior.
推荐
High-Speed Test and Measurement Equipment
The SY89426JI can serve test equipment that derives established SONET clock frequencies from a common reference instead of relying on multiple independent oscillators. The 622.08 MHz differential PECL output is appropriate for driving compatible high-speed detectors or counters, and the 155.52 MHz single-ended output provides a second measurement domain. Account for cable and fixture loss during frequency-amplitude margin testing, and confirm the output amplitude and termination requirements in the full datasheet. The documented 0.01 UI jitter figure provides useful context but is not a complete test-system jitter budget.
推荐
Optical Transport Module Clocking
The SY89426JI can support timing functions inside an optical transport module or its line-card electronics when those blocks operate at SONET-related frequencies. Its dual output formats let compatible serializer, transceiver, or test circuits receive either differential or single-ended PECL timing. Keep the reference distribution short and isolate noisy switching supplies from the clock source, since supply disturbance can influence jitter. The available evidence does not confirm radiation, temperature, or automotive qualifications, so those requirements must be verified separately rather than inferred from the SONET positioning.
推荐
Industrial Communication Timing Reference
The SY89426JI may fit legacy or specialized industrial communication equipment that retains SONET-derived timing architecture. Its TTL/CMOS-compatible reference inputs and reference output can help organize a local clock hierarchy, while 622.08 MHz and 155.52 MHz outputs address high-speed and lower-rate domains. Before adoption, confirm that the operating temperature, supply range, aging expectations, and lifecycle status satisfy the industrial requirement; these details are unavailable in the supplied verified snippets. Thermal design and long-term sourcing should therefore be treated as unresolved engineering gates.
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推荐产品汇总
工程参考数据： SY89426JI ——对比、设计指导和合规信息。
选型指南
关键差异点
- Dual SONET-related clock outputs from one IC （对比 General-purpose single-output frequency synthesizer)
- Supports two PECL output configurations （对比 Single-ended-only clock output)
- Documented SONET jitter target （对比 Unspecified general-purpose clock generator)
设计说明
Treat the 622.08 MHz output as a high-speed differential clock. Use a matched, continuously referenced-impedance route with symmetrical geometry, avoid stubs and unnecessary layer transitions, and implement the PECL termination and biasing network specified in the complete datasheet. The supplied data identifies differential PECL but does not provide output amplitude, rise/fall time, or recommended trace geometry, so those values must not be guessed.
Confirm the device's supply voltage, current, and decoupling requirements from the authoritative datasheet before schematic release. Keep the reference input and clock outputs away from noisy return-current paths, and provide local bypass connections according to the manufacturer's layout guidance. No supply values are present in the verified search data, so choosing a regulator or capacitor set from assumptions could compromise operation or reliability.
Do not substitute SY89426JI-TR for SY89426JI solely because both distributor results use a 28-LCC package. The suffix may denote a different packaging or ordering code, and the supplied evidence does not confirm identical pins, temperature grade, or electrical limits. Request the manufacturer ordering table and full data sheets, then compare every connected pin and operating condition before treating either order code as interchangeable.
合规信息
The supplied verified web data contains no substantiated RoHS, REACH, halogen-free, lead-free, or conflict-minerals statements. AEC-Q100 is marked not_applicable because no automotive qualification is identified and the device is positioned as a SONET clock synthesizer.