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SY87739LHG - 729 MHz Fractional-N Synthesizer | Microchip Technology
SY87739LHG

SY87739LHG - 729 MHz Fractional-N Synthesizer | Microchip Technology

Microchip Technology SY87739LHG is a fractional-N frequency synthesizer designed for high-performance data transport systems, with a maximum output frequency of 729 MHz, PECL inputs and outputs, and a 32-TQFP-EP package measuring 7 x 7 mm. The device is assigned to the application-specific clock and timing category and supports Ethernet, Fibre Channel, SONET/SDH, and ATM clocking applications. 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 A key design consideration is that the listed device status is obsolete.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.

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SY87739LHI - 729MHz Fractional-N Synthesizer | Microchip
SY87739LHI

SY87739LHI - 729MHz Fractional-N Synthesizer | Microchip

Microchip Technology SY87739LHI is a protocol-transparent, 3.3 V fractional-N frequency synthesizer with one differential PECL output, an output-frequency range of 10 MHz to 729 MHz, and operation from a single 27 MHz reference source. The device is supplied in a 32-pin TQFP with exposed pad package, designated 32-TQFP-EP (7x7) by DigiKey. Its architecture provides rate-independent synthesis for communications equipment requiring exact frequencies associated with Ethernet, Fibre Channel, SONET/SDH, and ATM protocols. A fractional-N synthesizer is a clock-generation IC that derives an output clock from a stable reference while using fractional division to produce frequencies that are not limited to integer ratios of the reference. The SY87739LHI belongs to the broader clock and timing hierarchy: fractional-N frequency synthesizer, clock generator, timing IC, and integrated circuit. This makes it useful where a system requires a programmable or protocol-related clock while retaining the operational simplicity of a single-reference architecture. The primary electrical features include a 10 MHz to 729 MHz synthesis range, a maximum characterized output frequency of 729 MHz, one differential PECL output, and 3.3 V operation. A 27 MHz reference allows the synthesizer to generate exact frequencies used by common transport protocols, with or without forward-error correction. Protocol transparency is important because the generated frequency can follow the required clock relationship rather than being limited to a fixed integer divider ratio. The SY87739L integrates a complete rate-independent frequency-synthesis function in one IC. It is specified for Ethernet, Fibre Channel, SONET/SDH, and ATM clock-generation requirements, making it particularly relevant to optical transponders, line cards, clocking subsystems, and communications test equipment. Its differential PECL interface supports high-speed clock distribution, although board-level implementation still requires correct differential routing, controlled impedance, and power-supply decoupling. Typical uses include SONET/SDH transponder reference generation, Fibre Channel interface clocking, Ethernet equipment clock synthesis, ATM networking hardware, optical transport modules, and laboratory communication test systems. Designers should confirm that the selected output frequency, reference configuration, PECL termination, and thermal conditions match the exact datasheet operating requirements before releasing production hardware. PCB implementation requires careful treatment of the exposed pad and high-speed clock nets. The exposed pad should be connected to the ground plane through the manufacturer-recommended thermal-via pattern, while input, output, and supply connections should be kept short. PECL output biasing and any downstream termination must follow the reference circuit because incorrect termination can alter edge quality, current consumption, and clock amplitude. This product record combines the verified manufacturer and distributor data with practical selection criteria for protocol timing, package-aware alternatives, and implementation considerations. It highlights where verified electrical data is available and marks undisclosed electrical, lifecycle, pricing, and pin-level information explicitly rather than inferring values that are not supported by the supplied sources.

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SY87739LHY - 729MHz Fractional-N Synthesizer | Microchip
SY87739LHY

SY87739LHY - 729MHz Fractional-N Synthesizer | Microchip

The Microchip Technology SY87739LHY is a protocol-transparent fractional-N clock synthesizer that generates differential PECL output frequencies from 10MHz to 729MHz using a single 27MHz reference oscillator. The device is packaged in a 32-pin TQFP with exposed pad, providing one clock output and dedicated support for high-speed communication protocols. A fractional-N synthesizer is a phase-locked-loop timing device that derives an output frequency from a stable reference clock using programmable division ratios. The SY87739LHY belongs to the fractional-N synthesizer hierarchy, PLL-based clock generator family, and broader clock and timing IC category. Its protocol-transparent architecture allows a system to synthesize common data-transport reference rates without using a separate dedicated clock generator for every standard. The primary features include operation from a 3.3V supply, a 27MHz reference input, and output coverage extending to 729MHz. Two tandem PLL circuits provide the frequency synthesis functions: a modified fractional-N stage produces rational-ratio frequencies, while a second integer-ratio stage can adjust the resulting output. Differential PECL outputs are suited to high-speed optical, serial, and telecommunications systems requiring a low-noise clock reference. The device can generate exact reference frequencies used by common transport protocols, including configurations with or without forward error correction. The first PLL supports protocol rates except those containing FEC or digital-wrapper overhead, while the second PLL provides an additional output adjustment stage. This architecture offers design flexibility while preserving a single-reference-clock implementation, reducing the number of separate oscillator and divider chains required in a communication line card. Typical applications include Ethernet and Fibre Channel line interfaces, SONET/SDH/ATM transponders, optical communication modules, network timing subsystems, and high-speed serial backplanes. The 729MHz upper limit supports demanding serial links, while the 10MHz lower limit permits synthesis of lower-rate references for adjacent digital circuitry. PCB implementation should preserve short, impedance-controlled routes for the differential PECL clock outputs and provide a continuous ground reference beneath the exposed pad. Input and output return paths should avoid shared-current coupling with switching supplies. Decoupling capacitors should be placed directly across the device supply pins according to the manufacturer layout guidance, while the exposed pad requires thermal vias and adequate copper area. This page combines the manufacturer description with package, protocol, frequency, and sourcing details while separating engineering guidance from basic catalog data. It also identifies the verified pin-compatible family options and the unresolved qualification details that should be confirmed before production substitution.

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SY87813LHG - 3.3V Any-Rate 1.3Gbps CDR | Microchip
SY87813LHG

SY87813LHG - 3.3V Any-Rate 1.3Gbps CDR | Microchip

The Microchip SY87813LHG is a 3.3V any-rate clock and data recovery integrated circuit designed for NRZ data rates from 28Mbps to 1.3Gbps. It combines clock recovery and data retiming in a 32-pin TQFP package with an exposed pad. The device is identified by the Microchip Technology clock and timing product category and is listed as lead-free. A clock and data recovery IC, commonly called a CDR, is a timing integrated circuit that extracts or reconstructs a usable clock from a serial data stream and aligns the data for downstream processing. The CDR belongs to the broader clock and timing hierarchy, which includes clock buffers, clock generators, phase-locked loops, multipliers, and data-retiming devices. These circuits support the reliable transfer of high-speed information through serial communication, storage, networking, and test systems. The SY87813LHG supports an unusually broad 28Mbps-to-1.3Gbps operating range in a single device. Its any-rate architecture makes it useful when one board design must accommodate several serial link rates. The 3.3V supply requirement also simplifies power planning for conventional 3.3V digital systems. NRZ signaling compatibility is central to the device's ability to recover timing and retime data in high-speed serial paths. Technically, the SY87813LHG performs two related functions. Clock recovery separates timing information from the incoming data stream so that a stable clock can be reconstructed, while data retiming aligns the serial data with that recovered clock. This division of responsibility helps reduce accumulated timing uncertainty between transmitter and receiver. The combination is particularly valuable in links where source and destination circuits cannot share a sufficiently stable common clock. Typical applications include telecom and wireless communication equipment, SDH-based transport systems, network-interface equipment, optical-module electronics, and high-speed backplanes. A 1.3Gbps-capable CDR can also be evaluated for test and measurement systems, industrial control links, and embedded equipment that must recover clocking from received serial data. The exact interface standard and board-level signal integrity still require validation in the final system. A critical design consideration is that high-speed clock recovery depends on input signal quality as well as device capability. The data and clock inputs must be routed with controlled impedance, short return paths, and minimal discontinuity. Power and ground distribution must remain quiet because reference jitter and supply disturbance can affect recovery margin, especially when the installed link approaches the upper end of the supported range. This product page combines the identified electrical characteristics, package information, sourcing structure, and application guidance to help engineers evaluate the SY87813LHG for NRZ serial links. It also distinguishes verified component facts from design parameters that must be confirmed against the complete manufacturer datasheet and the specific channel implementation before layout release or production use.

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SY88803VKG - 155Mbps PECL Limiting Post Amplifier | Microchip
SY88803VKG

SY88803VKG - 155Mbps PECL Limiting Post Amplifier | Microchip

The Microchip Technology (formerly Micrel) SY88803VKG is a 3.3V/5V, 155Mbps PECL low-power limiting post amplifier with a TTL Loss-of-Signal (LOS) output, housed in a 10-pin MSOP package. It is designed specifically for fiber-optic receiver front ends that follow a transimpedance amplifier (TIA). A limiting post amplifier is the second stage in an optical receiver signal chain. The linear signal output from a TIA can contain significant amounts of noise and may vary widely in amplitude; a limiting amplifier converts this small, noisy differential signal into a clean, fixed-amplitude logic-level PECL data stream, restoring signal integrity before clock-and-data-recovery (CDR) circuitry. In the hierarchy of optical receiver electronics, it sits between the TIA and the CDR/serializer, and is a form of special-purpose high-speed amplifier IC. Key features include single 3.3V or 5V supply operation to 155Mbps, low-noise PECL differential data outputs, a chatter-free TTL Loss-of-Signal output, a TTL /EN enable input for power management, and a programmable LOS assertion threshold. Low power consumption suits compact optical modules such as OC-3/STM-1 and Fast Ethernet transceivers. Architecturally, the device uses a cascade of wideband differential gain stages with automatic offset compensation; the saturating output stages guarantee constant output swing regardless of input amplitude above sensitivity. The programmable LOS threshold lets designers match the trip point to the optical module sensitivity budget, and the chatter-free hysteresis design prevents false LOS toggling near threshold. Typical applications include 155Mbps fiber-optic receivers, SDH/SONET OC-3 line cards, Fast Ethernet (100Base-FX) optical modules, and industrial fiber links. It connects directly to typical TIAs, making it a drop-in signal-chain element. Design consideration: route the differential PECL outputs as 50-ohm controlled-impedance pairs and decouple the supply pins close to the package to keep jitter low; verify the LOS threshold setting against the TIA output amplitude range. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.

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SY88903KC - 1.25Gbps Limiting Post Amplifier | Microchip
SY88903KC

SY88903KC - 1.25Gbps Limiting Post Amplifier | Microchip

The Microchip Technology SY88903KC is a 1.25 Gbps high-speed limiting post amplifier designed for fiber-optic receivers, operating from a single 3.3 V power supply in a 10-pin MSOP package. Its differential PECL inputs accept signals as small as 5 mVp-p and produce stable, limited-amplitude data for downstream PECL-compatible devices. A limiting post amplifier is a special-purpose amplifier that provides high gain and wide bandwidth near the output of an optical receiver. Unlike a linear amplifier, it restores a consistent digital output amplitude after the photodiode, transimpedance amplifier, and clock-recovery stages have introduced attenuation and noise. The SY88903KC is intended to work with the related SY88902 and SY88904 receiver functions. Principal features include operation to 1.25 Gbps, differential PECL data inputs, a TTL enable input, low-noise amplification, and chatter-free loss-of-signal generation. The open-collector TTL LOS output allows the receiver system to detect an absence of incoming optical signal without mistaking brief signal interruptions for a hard failure. Because the output is open collector, an external pull-up resistor is required when the LOS function is used. The SY88903KC uses PECL-compatible signaling at its data inputs and outputs, a common high-speed logic standard in optical transport systems where short signal excursions are easier to maintain than CMOS swings. Its limiting behavior supplies a consistent output level for controllers, serializers, and clock-and-data-recovery circuits. The single-supply architecture simplifies the design of line cards and optical transceiver modules, although the input and output biasing networks must follow the manufacturer's reference circuit. Typical uses include 1.25 Gbps SONET and related fiber-optic links, optical network transceivers, PON equipment, and clock-recovery subsystems. The IC is particularly appropriate where a weak received signal must be restored without adding excessive pattern-dependent jitter or requiring a separate linear gain stage. In implementation, preserve the high-speed differential trace geometry, keep PECL input and output connections short, and place the LOS pull-up resistor close to the open-collector pin. Confirm the receiver's data rate, common-mode voltage, termination scheme, and power sequencing against the manufacturer datasheet before releasing a production layout. This page consolidates verified manufacturer and distributor information, interface characteristics, application guidance, and practical implementation notes for engineers evaluating the SY88903KC in 1.25 Gbps optical receiver designs.

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SY88913KC - 1.25Gbps Limiting Post Amplifier | Microchip
SY88913KC

SY88913KC - 1.25Gbps Limiting Post Amplifier | Microchip

The Microchip Technology SY88913KC is a 1.25Gbps high-speed limiting post amplifier packaged in a 10-MSOP and intended for receive-chain signal conditioning. Its principal functions are high-speed limiting amplification and programmable loss-of-signal detection. The device includes an LOSLVL control that adjusts the level-detect threshold through a resistor divider connected between VCC and VREF, allowing the receiver to distinguish a valid signal from an absent or degraded input. According to the manufacturer datasheet, the detected state can be returned to the receiver's /EN input to help maintain system stability when the signal is lost. A limiting post amplifier is a signal-conditioning IC within the broader optical-communication receiver chain. It receives a high-speed data signal that has already been converted into an electrical signal, restores the waveform to suitable logic levels, and provides a predictable output suitable for driving downstream circuitry. Its 1.25Gbps headline data rate places it in the class of high-speed line-rate interface amplifiers rather than low-frequency audio or instrumentation amplifiers. The SY88913KC includes several implementation-critical features. Programmable level detection allows the loss-of-signal threshold to follow a particular optical receiver's sensitivity, power budget, and system noise conditions. The documented output termination requirement calls for a 50-ohm load connected to VCC minus 2V, or an equivalent Thevenin termination, which helps establish the correct high-speed output environment. The manufacturer also emphasizes that PCB layout strongly affects performance. The device is supplied in a compact 10-MSOP package and identified as a commercial-temperature ordering option. In a typical optical-module or telecommunications receiver design, the SY88913KC can sit after the photodiode or transimpedance stage and before a clock-and-data-recovery circuit, serializer, or digital decision circuit. Its role is to provide limiting amplification and loss-of-signal information rather than to perform clock recovery or decoding. Careful signal-integrity layout is essential when using this amplifier. High-speed traces should be short, impedance-controlled, properly terminated, and kept away from unrelated clocks and switching nodes. The input, output, supply, and reference connections should follow the manufacturer layout guidance. Because the device relies on a defined termination network and adjustable level-detect threshold, substituting components without comparing pin functions, supply requirements, threshold behavior, and output termination can alter receiver performance. This page consolidates the verified 1.25Gbps limiting-amplifier description, programmable loss-of-signal behavior, package information, sourcing details, and practical implementation considerations into one engineering-focused reference. It also identifies where verified replacement data and detailed electrical limits are unavailable so engineers can distinguish documented facts from parameters requiring confirmation in the manufacturer datasheet.

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SY88923KC - 2.5Gbps Limiting Post Amplifier | Microchip
SY88923KC

SY88923KC - 2.5Gbps Limiting Post Amplifier | Microchip

The Microchip Technology SY88923KC is a 2.5Gbps high-speed limiting post amplifier with differential PECL inputs, a TTL enable input, and an open-collector TTL loss-of-signal output. The device accepts signals as small as 5mVp-p and is supplied in a 10-MSOP surface-mount package. A limiting post amplifier is a high-speed amplifier that increases the amplitude of small received signals and limits their swing to produce logic-compatible levels. Within the optical-communications hierarchy, the SY88923KC belongs to the limiting amplifier class of high-speed amplifier ICs used after photodetectors in fiber-optic receivers. Its principal role is signal conditioning between an optical receiver front end and a PECL-capable digital logic device. Key features include operation at data rates up to 2.5Gbps, low-noise amplification, differential PECL signal inputs, a TTL/EN input, and chatter-free loss-of-signal generation. The post amplifier can drive devices with PECL inputs while providing a separate open-collector TTL indication when the received signal falls below the selected detection level. The programmable level-detect function supports receiver supervision in optical-network equipment. The SY88923KC operates from either 3.3V or 5V and uses a single power supply. Differential signaling reduces sensitivity to common-mode noise when routing the recovered signal through a high-speed printed circuit board. The limiting architecture is intended to provide compatible output levels while preserving operation at multi-gigabit line rates. Its small 10-MSOP package also makes it practical for compact transceiver and line-card designs. Typical applications include 2.5Gbps fiber-optic receivers, optical network terminals, optical network units, digital cross-connect systems, and other PECL-based communication equipment. The verified source information specifically identifies the SY88922 and SY88905 as devices designed to work with the SY88923 family. These relationships can support complete receiver signal-chain designs rather than using the post amplifier as an isolated component. When laying out the circuit, keep the differential PECL traces short, continuous, and impedance controlled, with close placement of the required bypass and termination components. Verify input common-mode voltage, output termination, loss-of-signal polarity, and enable-logic levels against the manufacturer datasheet. Because the available evidence does not provide a complete verified pin table, component tolerances, or full electrical tables, those values should be confirmed before layout release. This product record combines the verified 2.5Gbps, 5mVp-p, 3.3V/5V, PECL, LOS, and 10-MSOP information with lifecycle status, sourcing links, and explicit engineering cautions. It also distinguishes verified functions from unverified specifications and avoids presenting generic cross-reference tools as proof of a pin-compatible replacement.

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SY89112UMY - 12-Output 3 GHz LVPECL Clock Buffer | Microchip
SY89112UMY

SY89112UMY - 12-Output 3 GHz LVPECL Clock Buffer | Microchip

The Microchip Technology SY89112UMY is a low-jitter, low-skew, high-speed LVPECL clock fanout buffer with a 1:12 differential fanout ratio and a 2:1 input multiplexer, supplied in a 44-pin VFQFN package with an exposed pad. It supports clock frequencies up to 3 GHz and operates from 2.5 V or 3.3 V supplies. The device distributes one selected differential clock to 12 outputs while supporting clock switchover between two input sources. A clock fanout buffer is a digital integrated circuit that reproduces a high-speed clock signal across multiple outputs. Clock buffers and drivers belong to the broader clock and timing IC family, where low jitter, low skew, deterministic propagation delay, and controlled output impedance determine whether timing relationships remain usable at system level. The SY89112UMY combines this distribution function with an integrated 2:1 multiplexer, reducing the need for separate switching components in redundant-clock and source-selection architectures. Its principal advantages are the 3 GHz maximum clock rate, 12 differential LVPECL outputs, and low-jitter, low-skew operation. The internal input termination and 2:1 multiplexer make the device suitable for systems that must switch between primary and backup clock sources. LVPECL outputs support high-speed point-to-point links over controlled-impedance interconnects, while low output jitter helps preserve timing margins in telecommunications, enterprise server, and other precision clock-distribution systems. The SY89112UMY is intended for telecom infrastructure, enterprise servers, network equipment, high-speed backplanes, and other systems requiring multiple synchronized LVPECL clock outputs. Differential routing between the buffer outputs and receivers is important because equal-and-opposite signals improve noise rejection and reduce susceptibility to common-mode interference. Board designers must also treat the exposed pad as a thermal and electrical feature rather than an unused lead. A key design consideration is transmission-line control. When connected to short PCB traces, the buffer still requires appropriate source and receiver termination to establish the intended LVPECL voltage and current. Longer interconnects should be routed as controlled-impedance differential pairs, with return-path continuity maintained through adjacent ground references. Decoupling, input reach, output isolation, and clock-switchover control must be evaluated together to avoid introducing excessive jitter or crosstalk. This product page combines the verified manufacturer identity and distributor descriptions with practical clock-distribution guidance. It also separates documented characteristics from parameters that require confirmation in the manufacturer datasheet, helping engineers evaluate SY89112UMY for high-speed telecom, server, and network-clock applications without assuming unsupported electrical or timing details.

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SY89113UMY - 1:12 LVDS Clock Fanout Buffer | Microchip
SY89113UMY

SY89113UMY - 1:12 LVDS Clock Fanout Buffer | Microchip

The Microchip Technology SY89113UMY is a 2.5 V low-jitter, low-skew 1:12 LVDS fanout buffer with a 2:1 input multiplexer, operating up to 1 GHz in a 44-MLF package with an exposed pad. It accepts two selectable clock inputs and distributes one selected clock across 12 LVDS outputs, providing switchover capability and high fanout in a compact package. A clock fanout buffer is a digital interface device that reproduces one input clock to multiple outputs while preserving signal timing relationships. The SY89113UMY belongs to the clock-buffer hierarchy, combining clock distribution, a 2:1 multiplexer, differential LVDS I/O, and internal input termination in one device. These functions are useful when a system must route a clock locally, isolate multiple destinations, or support redundant clock-source selection. The device provides a 1:12 fanout ratio, a 2:1 input multiplexer, and operation up to 1 GHz. Differential LVDS clocking reduces sensitivity to noise compared with single-ended distribution when the circuit is implemented with controlled impedance, short traces, and appropriate termination. The input mux permits a design to select between two clock sources, while the 12 outputs can feed multiple destination circuits from a common distribution point. The SY89113UMY operates from a 2.5 V supply, making it suitable for systems using a dedicated 2.5 V clock domain. Its specified low-jitter and low-skew characteristics are particularly relevant to communication, server, and test systems where timing consistency between distributed clocks affects data integrity, sampling margins, and clock-domain reliability. Typical uses include server backplane clock distribution, telecommunications equipment clock routing, high-speed backplane fanout, and test-and-measurement systems requiring selectable clock sources. In a switchover design, the two mux inputs can be driven by redundant clocks, with the selected source distributed to 12 endpoints. The exposed-pad package also provides a direct thermal path when the device operates in a high-density system. PCB implementation requires careful attention to differential impedance, return paths, input termination, and output routing. Place the decoupling capacitor close to the supply pin, connect the exposed pad to the appropriate ground plane using the manufacturer’s thermal and layout guidance, and avoid adding excessive stubs to clock outputs. The full pin assignment and layout guidance should be taken from the pin-description table and application diagrams in the manufacturer datasheet. This page combines the device’s stated architecture and operating characteristics with package details, sourcing guidance, drop-in replacement analysis, comparison parameters, and practical implementation notes. It is intended to help engineers determine where the SY89113UMY fits in a clock-distribution design and which compatibility checks must be completed before substituting another part.

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SY89221UHY - 2 GHz 2:15 LVPECL Clock Buffer | Microchip
SY89221UHY

SY89221UHY - 2 GHz 2:15 LVPECL Clock Buffer | Microchip

The Microchip Technology SY89221UHY is a 2 GHz, 2:15 precision clock fanout buffer, divider, and multiplexer IC with 15 LVPECL outputs in a 64-pin TQFP exposed-pad package. It operates from 2.5 V or 3.3 V and accepts differential clock inputs with phase-matched output banks configurable for pass-through, divide-by-2, or divide-by-4 operation. The SY89221UHY is designed for high-speed communications systems requiring accurate clock distribution and flexible frequency generation. A clock fanout buffer is a clock-and-timing IC that receives one or more high-speed clock signals and reproduces them across multiple low-skew output channels. Within the broader semiconductor hierarchy, this device combines a clock buffer, frequency divider, multiplexer, and LVPECL interface into one integrated timing component. Such consolidation reduces the number of separate clock-distribution stages while preserving predictable phase relationships between output banks. The SY89221UHY supports clocks up to 2 GHz and provides 15 LVPECL outputs organized into independently controlled output banks. Its four output banks can be configured for pass-through, divide-by-2, or divide-by-4 clock ratios. Differential input termination accepts AC-coupled or DC-coupled sources, including signals as small as 100 mV, or 200 mV peak-to-peak, without requiring an external termination-resistor network in the signal path. Micrel's three-pin differential input architecture is a central implementation feature of the device. It allows the clock source to connect directly to the differential input structure while supporting very small input amplitudes. The low-skew, low-jitter LVPECL outputs use fast transition rates suited to high-speed serial links, test equipment, optical-network infrastructure, and other communications timing systems. The exposed pad provides the package with a thermal conduction path for power dissipation. Typical applications include telecommunications backplanes, serial-interface clock distribution, network equipment, high-speed test and measurement systems, and communications modules requiring multiple related clocks. The integrated divider and multiplexer functions are particularly useful when a system needs both divided and pass-through clocks distributed across several LVPECL destinations. When designing around the SY89221UHY, preserve the differential input topology and controlled impedance of the clock traces. Treat the 64-pin TQFP exposed pad as a thermal and layout feature rather than an optional mechanical detail, and consult the manufacturer pin-description table when assigning every signal. Validate output timing, divider configuration, and termination at the intended operating frequency rather than relying only on nominal rise and fall-time specifications. This product data combines the Microchip product description, manufacturer-hosted family datasheet, distributor part identification, and package information into an engineering-oriented overview. It also identifies the practical limits of the available drop-in options, distinguishes documented functionality from parameters requiring design verification, and provides application and layout guidance for evaluating the SY89221UHY in high-speed clock architectures.

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SY89426JC - 622.08MHz SONET Clock Synthesizer | Microchip
SY89426JC

SY89426JC - 622.08MHz SONET Clock Synthesizer | Microchip

The Microchip SY89426JC is a clock and frequency synthesizer IC that generates 622.08 MHz and 155.52 MHz clocks for SONET OC-12 and OC-3 systems, with a maximum output frequency of 622.08 MHz and a 28-pin J-lead LCC package. A clock synthesizer is a timing IC that derives one or more precisely related output frequencies from an external reference clock. Within the hierarchy of clock and timing integrated circuits, it supports communication infrastructure requiring low deterministic jitter, consistent frequency relationships, and multiple logic-compatible outputs. The SY89426JC uses TTL/CMOS-compatible inputs and provides PECL clock outputs. The device provides a single-chip source for 622.08 MHz and 155.52 MHz clocks. Its 622.08 MHz output is differential PECL, while the 155.52 MHz output is single-ended PECL. It also includes a reference output and supports SONET-compliant jitter performance stated as 0.01 UI in the retrieved technical data. The SY89426JC is intended for telecommunications equipment operating at SONET OC-12 and OC-3 line rates. The 622.08 MHz and 155.52 MHz outputs support clock generation in line-card, transceiver, and network-interface designs where a local oscillator must provide both high-speed and divided timing signals. Use controlled-impedance routing for the differential 622.08 MHz output and provide compliant termination and decoupling close to the device. The 28-LCC package is a leaded ceramic package, so thermal performance and assembly compatibility should be checked against the PCB footprint and manufacturing process. This page consolidates verified distributor specifications, package information, datasheet links, and design-oriented guidance for the SY89426JC clock synthesizer.

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SY89426JI - 622.08MHz SONET Clock Synthesizer | Microchip
SY89426JI

SY89426JI - 622.08MHz SONET Clock Synthesizer | Microchip

The Microchip Technology SY89426JI is a clock and frequency synthesizer IC that generates 622.08 MHz and 155.52 MHz clocks for SONET OC-12 and OC-3 systems. Its primary high-speed output is differential PECL, its 155.52 MHz output is single-ended PECL, and it accepts TTL/CMOS-compatible reference inputs. The device is packaged in a surface-mount 28-LCC J-lead package. 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.

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SY89426JY - 622.08MHz SONET Clock Synthesizer | Microchip
SY89426JY

SY89426JY - 622.08MHz SONET Clock Synthesizer | Microchip

The Microchip Technology SY89426JY is a clock/frequency synthesizer IC engineered for SONET OC-3 and OC-12 clock generation. It accepts a 38.88MHz-to-77.76MHz reference input and produces a maximum 622.08MHz clock, with documented TTL input and PECL/TTL output interfaces. The device is packaged in a 28-pin leaded chip carrier, identified by distributors as 28-LCC (J-Lead). Its core role is to derive a high-speed, phase-aligned telecommunications clock from a lower-frequency reference while supporting high-speed digital interfaces. 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.

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SY89464UMY - 2:10 Clock MUX Fanout | Microchip Technology
SY89464UMY

SY89464UMY - 2:10 Clock MUX Fanout | Microchip Technology

The Microchip Technology SY89464UMY is a 2:10 clock multiplexer and 1:10 LVPECL fanout buffer operating up to 2 GHz in a 44-pin VFQFN exposed-pad package. It supports redundant-source switchover while providing ten 800 mV LVPECL outputs with rise and fall times guaranteed below 220 ps. A clock multiplexer is a timing IC that selects between multiple clock sources and routes the selected signal to downstream circuits. A clock fanout buffer combines that selection function with multiple low-voltage positive ECL outputs. Together, these devices form the clock and timing hierarchy within semiconductor, interface IC, and clock-and-timing component categories. The SY89464UMY is designed for systems that need controlled source switching, distribution, and low-skew clock delivery. The differential input architecture uses a three-pin internal termination arrangement that accepts AC- or DC-coupled signals as small as 100 mV, or 200 mV peak-to-peak, without external level-shifting or termination networks. Its ten LVPECL outputs are specified at 800 mV into 100-ohm-compatible loads. This combination makes the device useful where a compact, high-speed clock tree must tolerate small-amplitude source signals while producing standard high-speed differential-clock outputs. The SY89464UMY is identified as a low-jitter 2:1 differential-input multiplexer with 1:10 LVPECL fanout. Its operating frequency reaches 2 GHz, and the 44-VFQFN exposed-pad package provides a high pin count for separate clock outputs and power-management connections. The exposed thermal pad also supports heat transfer from the device when output-current and switching activity are significant. Typical uses include redundant reference-clock distribution, high-speed telecommunications timing, server and network-clock fanout, FPGA reference-clock systems, and instrumentation requiring selectable clock sources. In a redundant system, the multiplexer can switch between two independent inputs while the fanout section drives multiple destination devices without requiring a separate one-to-many distribution buffer. Designers should use the pin-description and typical-application tables in the manufacturer datasheet to assign inputs, enables, power rails, and output terminations. Differential routing should be short and symmetrical, and the exposed pad should be connected to the appropriate ground plane with sufficient thermal copper. Decoupling must follow the datasheet recommendations to preserve low-jitter behavior. This page organizes the SY89464UMY’s clock architecture, electrical characteristics, application fit, confirmed same-package alternative, and PCB considerations into an engineering-focused guide that extends beyond a basic catalog listing.

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SY89465UMY - 2:10 LVDS Clock Fanout | Microchip
SY89465UMY

SY89465UMY - 2:10 LVDS Clock Fanout | Microchip

The Microchip Technology SY89465UMY is a high-speed clock multiplexer and fanout device combining a 2:1 runt pulse eliminator multiplexer with a 1:10 LVDS fanout in a 44-VFQFN exposed-pad package. It operates up to 2 GHz and accepts CML, LVDS, or PECL inputs while providing LVDS-compatible outputs. The device is intended for clock distribution systems where one source must be selected between two clocks before being distributed to multiple destinations. A clock multiplexer is a timing device that routes one of several input signals to a shared output path. Clock fanout extends one signal across multiple outputs so that all receivers see a closely related copy. The SY89465UMY combines these functions into one device: a 2:1 Runt Pulse Eliminator multiplexer first selects the required clock, and the 1:10 fanout then generates ten LVDS-compatible outputs. This integration reduces the number of separate clock-routing components required in a multi-load backplane or processor system. The SY89465UMY operates from a 2.375 V to 2.625 V supply and supports input logic levels of CML, LVDS, and PECL. Its LVDS outputs use rise and fall times guaranteed to be less than 220 ps, as stated for the SY89465U family on the Microchip product page. The 2 GHz maximum frequency makes the device suitable for high-speed communications, networking, storage, and test-and-measurement clock trees. The 44-VFQFN package provides 44 electrical positions and an exposed pad for thermal management in space-constrained designs. Microchip identifies the device as part of its Micrel Precision Edge high-speed product line. The combination of a runt-pulse-eliminating multiplexer and ten-output fanout allows a system designer to distribute a selected high-speed clock without using separate multiplexer and fanout stages. Typical uses include network switch and router backplanes, telecommunications line cards, server clock distribution, high-speed test equipment, and clock trees for parallel data converters. The multiple output count supports several receivers connected at controlled distances, while the 2:1 selection function supports clock switching, redundancy, or source arbitration. Careful layout is essential because LVDS clock signals depend on controlled differential impedance and short, symmetric routing. Place the decoupling capacitors close to the supply pins, route differential pairs over a continuous reference plane, and avoid introducing unmatched stubs. Confirm the output termination scheme and receiver loading against the system-level clock architecture before releasing the PCB layout. This page combines the technical specifications, sourcing information, application context, and drop-in replacement analysis for the SY89465UMY. It also identifies design trade-offs that are not apparent from a distributor category listing, including fanout architecture, supported input standards, package thermal considerations, and practical LVDS routing constraints.

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SY89467UHY - 1:20 LVPECL Clock Fanout | Microchip
SY89467UHY

SY89467UHY - 1:20 LVPECL Clock Fanout | Microchip

The Microchip Technology SY89467UHY is a 2.5 V/3.3 V LVPECL clock fanout buffer with a 2:1 differential input multiplexer, 20 LVPECL outputs, and a maximum clock frequency of 2 GHz in a 64-TQFP exposed-pad package. It is designed for systems that must select between two differential clock sources and distribute the selected clock across multiple high-speed loads. A clock fanout buffer is a clock-and-timing integrated circuit that reproduces a high-speed differential clock with low skew and controlled impedance. This device combines that distribution function with a 2:1 input multiplexer. The resulting topology is useful when a serializer, transceiver, retimer, FPGA, or communication engine must switch between two clock domains while maintaining a consistent LVPECL interface. Within the product hierarchy, it is a clock buffer and clock multiplexer, both belonging to clock-and-timing ICs and ultimately to the broader semiconductor category. The SY89467UHY provides 2:1 differential input selection, a 1:20 output fanout ratio, and operation from a 2.5 V or 3.3 V supply. Its listed operating-temperature range is -40°C to +85°C, while distributor records identify the device as a 2 GHz, 64-TQFP exposed-pad clock fanout buffer with multiplexer functionality. These characteristics make the part relevant to high-speed digital systems requiring more output copies than a simple one-to-one clock buffer can supply. A particularly important feature is Fail-Safe Input protection. According to the Microchip Technology product page, the FSI function helps prevent metastable output conditions when the selected input clock fails to a DC voltage. This behavior supports dependable system operation during clock-source faults, although designers still need to evaluate startup, input biasing, and source-switching requirements against the complete manufacturer application guidance. Typical uses include high-speed serial links, parallel data converters, telecommunications equipment, test-and-measurement instrumentation, FPGA clock distribution, and data-converter clocking. The 20-output architecture can feed several parallel LVPECL destinations from one selected differential source, while the multiplexer permits redundancy or source selection without requiring two complete downstream clock trees. The main design consideration is that the exposed-pad package requires careful PCB layout for thermal and electrical performance. Place the device close to the clock source and destinations, keep high-speed traces short and impedance controlled, provide the required decoupling and termination, and connect the exposed pad to the recommended ground-plane construction. Confirm all pin assignments, LVPECL interface details, and unused-output termination against the manufacturer datasheet before fabrication. This product record combines the manufacturer's functional description with distributor electrical and package details, drop-in replacement information, a parameter comparison, and practical clock-distribution design guidance. It is intended to help engineers identify the correct voltage, package, fanout, multiplexer, and fault-tolerance requirements before integrating the SY89467UHY into a high-speed clock architecture.

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SY89468UHY - 2:20 1.5 GHz LVDS Clock Fanout | Microchip
SY89468UHY

SY89468UHY - 2:20 1.5 GHz LVDS Clock Fanout | Microchip

The Microchip Technology SY89468UHY is a 2:20 LVDS fanout buffer with a 2:1 differential input multiplexer, operating from a 2.5 V ±5% supply and supporting input clock frequencies up to 1.5 GHz. The device is packaged in a 64-pin TQFP with an exposed pad. It provides twenty LVDS-compatible clock outputs, accepts AC- or DC-coupled differential signals as small as 100 mV (200 mVPP), and guarantees output rise and fall times below 270 ps. A clock fanout buffer is a clock-management IC that distributes one or more source clocks to multiple destinations while preserving signal amplitude, edge timing, and clock polarity. The SY89468UHY belongs to the hierarchy of clock buffers and drivers, clock distribution ICs, timing-control devices, and broader semiconductor components. Its differential multiplexer allows a system to select between two clock inputs before distributing the selected clock across twenty outputs. The key features include a 2:1 differential input multiplexer, a 1:20 fanout ratio, LVDS-compatible outputs, and a maximum listed operating frequency of 1.5 GHz. The internal three-pin termination architecture allows small-amplitude differential inputs without an external termination resistor network in the signal path. Fail-Safe Input behavior is designed to prevent metastable output conditions when the selected differential input fails to a DC voltage. Internally, the part combines a selectable differential input stage, clock distribution circuitry, and twenty low-voltage differential outputs. The output stage is specified for rise and fall times below 270 ps, making it appropriate for high-speed clock-distribution networks. The 2.5 V ±5% supply requirement supports integration into compact, high-speed digital systems while the exposed pad provides a thermal path from the device to the PCB. Typical uses include telecommunications equipment, industrial control systems, data-conversion equipment, high-speed computing, network timing, and instrumentation. A single SY89468UHY can feed twenty clock destinations when one selected differential source is sufficient, while the multiplexer supports source redundancy or clock switching between two domains. Care is required to preserve LVDS signal integrity through controlled-impedance routing and correctly terminated differential clock networks. For PCB implementation, place the device close to the clock source, use matched routing for each differential pair, provide a continuous ground reference, and connect the exposed pad to the appropriate ground plane. Verify input amplitude, common-mode voltage, output termination, and downstream rise-time requirements before releasing the layout. This page combines the device function, verified timing and supply characteristics, sourcing guidance, and practical layout considerations to support clock-tree design. It also distinguishes the verified SY89468UHY ordering code from related manufacturer ordering and comparison candidates, helping engineers determine whether a proposed replacement preserves the required footprint and electrical behavior.

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SY89826LHY - 1 GHz 22-LVDS Fanout Buffer | Microchip
SY89826LHY

SY89826LHY - 1 GHz 22-LVDS Fanout Buffer | Microchip

The Microchip Technology SY89826LHY is a 3.3 V precision 1:22 LVDS fanout buffer and translator with a 2:1 input multiplexer, operating up to 1 GHz in a 64-TQFP exposed-pad package. It provides 22 differential LVDS output pairs for distributing precisely aligned, low-skew clock signals across multiple destinations. A clock fanout buffer is a clock-management IC that receives one source clock and generates multiple buffered copies. Clock buffers and drivers belong to the clock and timing IC family, where they provide fanout, translation, isolation, and signal conditioning. The SY89826LHY combines this function with differential signal translation and input multiplexing for systems requiring flexible clock-source selection. The principal features are a 1 GHz operating frequency, 1:22 fanout ratio, 22 differential LVDS output pairs, 2:1 input multiplexing, and a 3.3 V supply. These functions allow one device to select between two input sources and distribute the selected clock to a large number of LVDS receivers while maintaining consistent edge relationships across the output network. The device is intended for low-voltage 3.3 V clock-distribution systems where many receivers require differential clock inputs. Its LVDS outputs suit point-to-point interconnects on circuit boards, backplanes, and rack-level systems. The exposed pad beneath the 64-TQFP package provides a thermal connection to the PCB, while the multiplexed inputs reduce the number of separate source-selection components required in a multi-clock architecture. Typical applications include synchronized computing and networking equipment, communication backplanes, test and measurement systems, industrial control electronics, server clock distribution, and high-speed instrumentation. In each case, the central design objective is to provide many low-skew differential clock outputs from one or two incoming sources. Layout is critical because 22 differential outputs magnify trace-length, impedance, return-path, and crosstalk sensitivity. Follow the pin-description table and recommended decoupling arrangement in the Microchip datasheet, preserve controlled-impedance routing for LVDS pairs, and connect the exposed pad to a low-impedance thermal plane. Validate output skew and signal integrity on the finished board because package and routing effects can influence system-level timing margins. This product page combines the manufacturer's functional description with package, sourcing, comparison, and layout guidance. It also distinguishes true drop-in options from ordering-code variants and documents which electrical details require confirmation from the complete manufacturer datasheet before a production release.

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SY89828LHY - 1GHz Dual LVDS Fanout Buffer | Microchip
SY89828LHY

SY89828LHY - 1GHz Dual LVDS Fanout Buffer | Microchip

The Microchip Technology SY89828LHY is a 3.3 V precision LVDS clock fanout buffer and translator with a 1 GHz operating frequency, two 1:10 differential fanout channels, and twenty differential LVDS output pairs. It accepts two differential inputs through a 2:1 input multiplexer and is housed in a 64-pin TQFP package with an exposed pad. The device is intended for systems that require multiple precisely aligned, low-skew clock signals. A clock fanout buffer is a clock-management IC that reproduces one input signal across several outputs. The SY89828LHY belongs to the clock buffer and clock distribution hierarchy, where low-skew fanout helps preserve timing relationships among high-speed digital circuits. Its differential LVDS interface is designed for 3.3 V systems in which numerous destinations must receive coherent signals over controlled low-voltage differential connections. The principal feature is the combination of two 1:10 fanout paths and a 2:1 input multiplexer. According to the manufacturer product description, the part provides twenty differential LVDS output pairs, allowing a compact architecture to distribute clocks across as many as twenty receiver locations. A maximum operating frequency of 1 GHz supports demanding clock-routing requirements while the dual fanout structure reduces the number of separate clock-distribution devices required. The SY89828LHY also functions as an LVDS translator, allowing the buffered signals to be redistributed using the differential signaling format. This combination is useful when one source must feed multiple subsystems whose clocks must remain aligned. The exposed pad in the 64-pin TQFP package provides the primary thermal path for this high-output-count, 1 GHz device, making careful PCB thermal design important. Typical applications include communication equipment, parallel processing systems, test and measurement instrumentation, server or storage clock distribution, and high-speed backplane interfaces. It is particularly relevant where a single differential clock must reach many endpoints without introducing excessive skew between output pairs. System architects can select the active input through the multiplexer and distribute the selected clock across the available LVDS outputs. Layout should use controlled-impedance LVDS routing, symmetrical differential pairs, solid ground-plane continuity, and the exposed pad connected to a low-impedance thermal plane. Decoupling capacitors should be placed close to the supply and ground pins. Because this is a high-speed, high-output-count clock device, connector transitions, unequal pair lengths, and return-path discontinuities can degrade timing and signal integrity even when the nominal clock frequency remains below 1 GHz. This page combines the manufacturer’s device description, verified distributor identification, package details, application-oriented engineering guidance, and replacement availability analysis. It also distinguishes the core SY89828LHY function from the broader clock-buffer category and highlights design decisions that matter when distributing 1 GHz LVDS clocks across many destinations.

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SY89829UHY - 2 GHz Dual LVPECL Clock Driver | Microchip
SY89829UHY

SY89829UHY - 2 GHz Dual LVPECL Clock Driver | Microchip

The Microchip Technology SY89829UHY is a 2.5 V or 3.3 V high-performance dual LVPECL clock driver with dual 1:10 fanout, internal input termination, and redundant input switchover in a 64-pin TQFP exposed-pad package. It provides 20 outputs and supports operation up to 2 GHz for distributing precisely aligned, low-skew clock signals across complex digital systems. A clock driver is a specialized digital IC within the clock and timing hierarchy. It receives a reference clock, provides the electrical drive required by transmission lines, and fans that clock across multiple receivers. LVPECL clock drivers use differential positive-referenced emitter-coupled logic to support high-speed point-to-point links. The SY89829UHY combines this differential clock distribution function with multiplexing, internal termination, and redundant switchover in one device. The device can operate as a dual 1:10 fanout buffer or translator or as a single 1:20 arrangement. It accepts LVPECL or LVDS inputs, and its differential architecture is intended for systems requiring aligned outputs and controlled skew. The manufacturer identifies a maximum pin-to-pin skew of 50 ps and maximum part-to-part skew of 200 ps. Internal termination reduces the need for separate input matching components when the associated board-level network requires it. Redundant switchover gives the system two input paths and allows clock-source redundancy without implementing the multiplexing and fanout functions in separate ICs. This architecture can simplify board partitioning in telecom, networking, test equipment, and data-processing platforms. Compared with discrete clock trees, one integrated driver reduces device count, keeps the clock distribution topology centralized, and makes skew control easier to characterize across the complete output network. Typical uses include line-card clock distribution, redundant clock switching in communication equipment, synchronized backplane systems, high-speed test and measurement platforms, and parallel processing systems. At 2 GHz maximum operating frequency, the device is suited to demanding systems, but signal integrity still depends on correct source termination, controlled-impedance routing, appropriate return paths, and compliance with the layout guidance in the manufacturer datasheet. A critical design consideration is the exposed-pad thermal and return-path arrangement. Place the exposed pad on a solid ground plane with short thermal vias and preserve the high-speed differential topology recommended for the package. Account for power-supply noise, input common-mode behavior, output loading, and receiver termination when establishing the system clock budget. This page combines the manufacturer specifications, package details, sourcing structure, design guidance, and documented replacement information for engineers evaluating the SY89829UHY as a high-output-count LVPECL clock-distribution solution.

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SY89832UMG - 2.5V 1:4 LVDS Fanout Buffer | Microchip
SY89832UMG

SY89832UMG - 2.5V 1:4 LVDS Fanout Buffer | Microchip

Microchip Technology SY89832UMG is a 2.5 V, 1:4 differential LVDS fanout buffer/translator optimized for high-speed, low-skew clock distribution. The device provides greater than 2.0 GHz throughput, less than 570 ps input-to-output propagation delay, and guaranteed within-device skew below 20 ps across supply-voltage and temperature variation. It is packaged in a 16-VFQFN surface-mount package with an exposed pad and includes internal input termination. An LVDS fanout buffer is a clock-and-timing interface IC that receives one differential signal and reproduces it across four differential outputs. LVDS, or low-voltage differential signaling, supports high-speed data transfer through low-amplitude differential signaling and common-mode noise rejection. Within the broader semiconductor hierarchy, this device is a fanout buffer and translator, both of which fall under clock and timing ICs and support digital-interface clock distribution. The SY89832UMG is designed for applications in which predictable channel-to-channel timing is as important as high throughput. Its guaranteed within-device skew below 20 ps helps maintain alignment among the four outputs, while the less-than-570 ps input-to-Q propagation delay supports deterministic timing-budget analysis. The 2.5 V supply and 2 GHz-class performance suit communications, industrial control, test equipment, and high-speed digital backplane clock networks. Internal input termination reduces the external termination burden on AC-coupled or DC-coupled differential inputs. The device also includes a VREF-AC reference output for AC-coupled applications, as identified by Microchip for the SY89832U family. Because the outputs are generated internally with closely controlled skew, this buffer can reduce the need for external delay-line compensation when distributing a common differential clock. Typical applications include differential clock distribution for high-speed serializers, source-synchronous interface fanout, telecommunications backplanes, FPGA clock networks, and automated test equipment. In each case, system designers must preserve controlled trace geometry and provide a stable low-noise supply so the differential outputs retain their intended timing and signal-integrity behavior. PCB implementation should use symmetrical routing between each differential pair, maintain continuous reference planes, and place decoupling capacitors close to the supply pins. The exposed pad requires a thermal and return-path layout according to the manufacturer's package guidance. Differential input and output return paths should remain short, and test points should not introduce unequal loading across channels. This page combines the manufacturer's SY89832U technical information with application-oriented guidance for LVDS clock distribution, PCB implementation, timing-budget planning, and component selection. It highlights the SY89832UMG's 1:4 fanout, 2.5 V operation, 2 GHz-class throughput, internal termination, and less-than-20 ps within-device skew in a form useful to engineers evaluating high-speed clock architectures.

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SY89837UMG - 2GHz 1:8 LVPECL Fanout Buffer | Microchip
SY89837UMG

SY89837UMG - 2GHz 1:8 LVPECL Fanout Buffer | Microchip

Microchip Technology SY89837UMG is a 2 GHz precision clock fanout buffer with a differential 2:1 input multiplexer and eight LVPECL outputs, supplied in a 32-VFQFN exposed-pad package. It accepts CML, LVDS, or PECL inputs, operates from 2.375 V to 3.6 V, and is specified over -40°C to +85°C. Its principal function is to distribute one selected differential clock to eight outputs while rejecting short runt pulses during input switching. A clock fanout buffer is a digital interface IC belonging to the clock and timing IC hierarchy. It provides multiple low-jitter copies of a clock rather than changing the clock frequency. Clock buffers and drivers are used to extend reach, isolate loads, reduce skew, and improve clock distribution in communications, industrial, server, and test systems. The SY89837UMG adds a redundant-input multiplexer intended for systems where a second clock source may take over when the primary source fails. The 1:8 fanout architecture provides eight outputs from one selected input pair. A maximum operating frequency of 2 GHz supports high-speed digital clocking, while the 2:1 differential multiplexer supports source redundancy. The runt pulse eliminator is the defining functional feature: unlike an ordinary input multiplexer, it is designed to prevent short cycles or runt pulses from appearing at the outputs during switchover. This makes the device relevant to clock systems where an incorrect narrow pulse could create a functional fault downstream. The outputs are 800 mV LVPECL-compatible and have guaranteed rise and fall times below 200 ps. LVPECL is a high-speed differential logic family commonly used where low voltage swing and controlled edge rates are useful. The input stage accepts CML, LVDS, and PECL signaling, allowing the device to operate in systems using different clock-source conventions. The 2.375 V to 3.6 V supply range covers both nominal 2.5 V and 3.3 V implementations, subject to the exact operating limits of each selected rail. Typical applications include redundant server and telecommunications clock trees, industrial control systems, high-speed test equipment, network-interface clock distribution, and FPGA or ASIC clocking. The differential multiplexer is particularly useful when two potential clock sources must be combined without exposing downstream logic to runt pulses. The eight outputs can reduce the number of separate fanout stages required in a multi-branch clock architecture. Designers should treat input selection, termination, differential routing, and output impedance as an integrated high-speed signal-integrity task. Keep the differential input and LVPECL output traces short, matched, and continuous over a suitable reference plane, and use the manufacturer pin-description table when assigning every terminal. Validate switchover timing in the complete system because the behavior of the selected clock source, receiver thresholds, and downstream logic affects the observable result. This product summary organizes the SY89837UMG's fanout, multiplexer, logic-level, supply, frequency, package, and environmental characteristics into an application-focused guide. It also distinguishes confirmed device parameters from information that requires confirmation from the manufacturer datasheet before layout, replacement, or production qualification.

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SY89853UMG - 2:1 LVPECL Clock Multiplexer | Microchip
SY89853UMG

SY89853UMG - 2:1 LVPECL Clock Multiplexer | Microchip

Microchip Technology SY89853UMG is a precision, low-power dual 2:1 LVPECL clock multiplexer with a maximum operating frequency of 2.5 GHz, housed in a 32-pin VQFN exposed-pad package. It accepts CML, LVDS, or PECL inputs and provides LVPECL outputs, making it suitable for high-speed clock distribution, clock selection, and redundant clock routing systems. A clock multiplexer is an interface IC that selects one clock source from multiple inputs and forwards the selected signal to an output. Clock multiplexers belong to the broader clock and timing hierarchy, alongside clock buffers, clock generators, phase-locked loops, and clock-tree components. Their primary function is to route a stable high-speed clock while helping systems manage source redundancy, test modes, or multiple operating domains. The SY89853UMG combines two selectable 2:1 paths in one package. Its input circuitry supports CML, LVDS, and PECL formats, while its output uses LVPECL levels for compatible high-speed digital systems. The stated 2.5 GHz maximum frequency makes the device appropriate for communications equipment, network interfaces, clock-distribution fabrics, and test-and-measurement platforms operating with high-speed differential clock signals. Microchip describes the device as a precision, low-power dual 2:1 LVPECL multiplexer with internal termination. Differential clock signaling carries data as complementary signals, which helps reduce susceptibility to common-mode noise when the circuit is implemented with controlled impedance and correct termination. Internal termination is especially useful when it matches the transmission-line environment and avoids unnecessary external components. Typical applications include redundant-clock switching in telecommunications equipment, selectable synchronization for data converters, migration between functional blocks operating at different clock rates, and laboratory clock routing. The 32-pin VQFN exposed-pad package also supports compact layouts, although thermal management and via-in-pad construction should be evaluated against the manufacturer's recommended land pattern. When designing around the SY89853UMG, begin with the manufacturer's recommended differential trace geometry and termination arrangement. Confirm that the source amplitude, common-mode voltage, clock frequency, and selected logic standard are compatible with the inputs. Keep clock routing short and return the unused input to a defined state when the multiplexer configuration permits it. This product page combines the confirmed operating characteristics, package information, sourcing workflow, and application guidance for engineers evaluating the SY89853UMG. It also distinguishes the device from true pin-compatible alternatives and provides practical guidance for evaluating whether the mux, rather than a clock generator or buffer, is the correct architectural choice.

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