گھڑی اور وقت بندی
مصنوعات (470+)
MK2746G - 133.33MHz Clock Synthesizer | Renesas | DVD
The Renesas Electronics MK2746G is a clock and frequency synthesizer IC delivering a 133.33 MHz output for DVD and other MPEG2-based systems, supplied in a 16-pin TSSOP package measuring 4.40 mm wide. The verified distributor listing identifies one clock or frequency synthesizer channel and a maximum listed frequency of 133.33 MHz. According to the available Renesas documentation, the MK2746 family is a low-cost, low-jitter clock synthesizer designed around an analog phase-locked-loop technique. A clock synthesizer is a timing semiconductor that accepts or generates a reference frequency and produces one or more stable clock signals for digital systems. In the hierarchy of electronic components, it belongs to clock and timing ICs, frequency synthesizers, and phase-locked-loop devices. This category synchronizes processors, memories, converters, video pipelines, and communications circuitry, making clock quality and distribution important to system-level data integrity. The MK2746 accepts a 27 MHz fundamental-mode crystal or clock input and produces the timing signals required by DVD and MPEG2 applications. Its analog PLL architecture supports frequency synthesis while maintaining a compact implementation. The verified listing specifically confirms the 133.33 MHz class of output, low-cost positioning, and low-jitter operation, but the supplied source snippets do not expose the complete output-frequency table, PLL settings, supply limits, or jitter specification. The device is suitable for DVD players, DVD-related set-top equipment, MPEG2 media systems, and other consumer electronics that need a dedicated reference clock instead of a general-purpose high-speed clock generator. In these systems, the synthesizer can establish the timing relationship between a crystal oscillator and downstream logic, provided the board layout, decoupling, and output loading satisfy the manufacturer recommendations. PCB design should preserve a short, controlled return path from the crystal or clock source and minimize capacitance around high-impedance timing nodes. The TSSOP footprint also requires careful solder-paste and land-pattern design. Before production use, engineers should download the official MK2746 datasheet and verify supply voltage, absolute maximum ratings, pin functions, output-drive capability, load capacitance, and jitter limits. This page consolidates the verified distributor identity, package information, manufacturer documentation link, clock function, application fit, and sourcing references. It does not infer missing electrical values, pin assignments, or drop-in substitutes; those fields remain explicitly marked for validation rather than being presented as confirmed engineering data.
MK2746GLF - 133.33MHz DVD/MPEG Clock Source | Renesas
Renesas Electronics MK2746GLF is a 133.33 MHz DVD/MPEG clock source and clock synthesizer packaged in a 16-pin TSSOP. It is intended for timing applications requiring a stable reference associated with DVD and MPEG clock domains. The verified product information identifies the device as a clock generator, PLL, or frequency-synthesizer-class integrated circuit, with a 4.40 mm-wide 16-TSSOP package. A clock synthesizer is an integrated timing device that accepts or derives timing information and distributes clock signals needed by digital systems. Within the semiconductor hierarchy, a clock synthesizer belongs to clock and timing ICs, alongside clock generators, phase-locked loops, jitter cleaners, dividers, and buffer circuits. The MK2746GLF serves the practical role of producing the timing reference required by multimedia processing chains and other systems that synchronize digital operations. The principal verified headline specification is a 133.33 MHz clock associated with the DVD/MPEG clock-source function. The 16-TSSOP package provides a compact surface-mount option for consumer electronics, optical-disc systems, set-top equipment, and other timing subsystems. The package data identifies a body width of 4.40 mm, although complete land-pattern dimensions, exposed-pad details, and pin functions require consultation of the manufacturer datasheet. Its role in a DVD/MPEG system is primarily reference generation. A consistent clock helps coordinate data processing, transport logic, and connected digital subsystems. Unlike a general-purpose microcontroller, the MK2746GLF is dedicated to timing rather than executing application software. Compared with an on-board crystal oscillator and discrete divider network, an integrated clock synthesizer can consolidate clock-generation functions into one package, although final jitter, accuracy, supply range, and output count must be checked against the system timing budget. Typical deployment positions include DVD and MPEG multimedia clocking, consumer-video timing, set-top-box signal chains, and embedded systems that already specify the MK2746GLF as a reference-source device. In each case, designers should verify frequency tolerance, output topology, power requirements, startup behavior, and decoupling requirements against the exact Renesas documentation before releasing a production layout. A key integration consideration is that frequency alone does not establish end-to-end timing quality. Board-level supply noise, trace loading, clock-routing topology, output jitter, and grounding directly affect downstream performance. The 16-TSSOP footprint should therefore be treated as a timing-sensitive component placement, with short clock paths, controlled return current, and the power and ground connections specified by the manufacturer followed exactly. This page consolidates verified distributor, manufacturer-linked, package, application, comparison, and design information while clearly identifying parameters that still require confirmation from the complete datasheet.
MK2746GTR - 133.33MHz Clock Synthesizer | Renesas | DVD (Tape & Reel)
The Renesas Electronics MK2746GTR is a clock and frequency synthesizer IC delivering a 133.33 MHz output for DVD and other MPEG2-based systems, supplied in a 16-pin TSSOP package measuring 4.40 mm wide. The verified distributor listing identifies one clock or frequency synthesizer channel and a maximum listed frequency of 133.33 MHz. According to the available Renesas documentation, the MK2746 family is a low-cost, low-jitter clock synthesizer designed around an analog phase-locked-loop technique. A clock synthesizer is a timing semiconductor that accepts or generates a reference frequency and produces one or more stable clock signals for digital systems. In the hierarchy of electronic components, it belongs to clock and timing ICs, frequency synthesizers, and phase-locked-loop devices. This category synchronizes processors, memories, converters, video pipelines, and communications circuitry, making clock quality and distribution important to system-level data integrity. The MK2746 accepts a 27 MHz fundamental-mode crystal or clock input and produces the timing signals required by DVD and MPEG2 applications. Its analog PLL architecture supports frequency synthesis while maintaining a compact implementation. The verified listing specifically confirms the 133.33 MHz class of output, low-cost positioning, and low-jitter operation, but the supplied source snippets do not expose the complete output-frequency table, PLL settings, supply limits, or jitter specification. The device is suitable for DVD players, DVD-related set-top equipment, MPEG2 media systems, and other consumer electronics that need a dedicated reference clock instead of a general-purpose high-speed clock generator. In these systems, the synthesizer can establish the timing relationship between a crystal oscillator and downstream logic, provided the board layout, decoupling, and output loading satisfy the manufacturer recommendations. PCB design should preserve a short, controlled return path from the crystal or clock source and minimize capacitance around high-impedance timing nodes. The TSSOP footprint also requires careful solder-paste and land-pattern design. Before production use, engineers should download the official MK2746 datasheet and verify supply voltage, absolute maximum ratings, pin functions, output-drive capability, load capacitance, and jitter limits. This page consolidates the verified distributor identity, package information, manufacturer documentation link, clock function, application fit, and sourcing references. It does not infer missing electrical values, pin assignments, or drop-in substitutes; those fields remain explicitly marked for validation rather than being presented as confirmed engineering data.
MK2761AS - 27MHz Multi-Output Clock Synthesizer | Renesas
Renesas Electronics MK2761AS is a 27MHz clock and frequency synthesizer IC that accepts a crystal or clock input and generates multiple CMOS output clocks for set-top box applications. It uses an analog phase-locked loop (PLL), includes PLL bypass capability, and is housed in a 16-pin SOIC package measuring 0.154 inches, or 3.90 mm, in width. A clock synthesizer is a clock-and-timing integrated circuit that derives one or more stable digital timing signals from a reference oscillator. Clock generation belongs to the oscillator, frequency synthesis, clock management, and timing IC hierarchy before connecting to broader clock-and-timing and semiconductor systems. In consumer equipment, a synthesizer can distribute related reference-derived clocks while reducing the number of separate oscillators required. The MK2761AS supports a maximum frequency of 27MHz and accepts either a crystal or external clock. Its CMOS outputs suit digital logic that requires repeatable clock edges, while the PLL-bypass path provides flexibility when the design must use or pass through the reference clock. The 16-pin SOIC package is a surface-mount option compatible with conventional PCB assembly and inspection processes. This device is specifically described for set-top box clock generation, where digital video, audio, control, and interface circuitry may require coordinated timing. It can also be evaluated for other consumer or embedded systems that use a 27MHz reference and need several derived clocks, provided each output frequency, duty cycle, timing level, and load requirement is confirmed against the manufacturer datasheet. The principal design task is verifying the complete output-frequency plan and external crystal or clock network. Board placement should minimize clock routing length and noise pickup, while output loading and trace capacitance should match the device’s stated drive and timing requirements. Because only summary specifications were provided here, voltage ranges, current limits, jitter, output counts, pin functions, and exact frequency ratios require confirmation before release to production. This product record consolidates verified distributor information, package identification, functional characteristics, design cautions, and commercial availability. It also separates confirmed facts from missing datasheet parameters, helping engineers evaluate the MK2761AS for new designs, replacements, and set-top box clock-distribution requirements without assuming unverified specifications.
MK2761ASLF - 27MHz Set-Top Clock Synthesizer | Renesas
The Renesas Electronics MK2761ASLF is a 27 MHz set-top clock source and frequency-synthesizer IC housed in a 16-pin SOIC package. It uses analog phase-locked-loop techniques to accept a 27 MHz crystal or clock input and produce multiple output clocks. The device is identified as a low-cost, low-jitter, high-performance clock synthesizer designed specifically for set-top box applications. A clock synthesizer is a timing IC that establishes and distributes reference clocks throughout an electronic system. In the broader hierarchy, it belongs to clock and frequency generation, which supports clock and timing ICs and ultimately semiconductor timing infrastructure. Unlike a simple oscillator that provides one frequency, a synthesizer can generate several related clock outputs from a common reference, helping synchronize video, audio, communications, and control subsystems in a set-top box. The MK2761ASLF combines a 27 MHz reference input capability with analog PLL-based frequency synthesis and multiple clock outputs. Its 16-pin SOIC package provides a compact surface-mount format suitable for mainstream consumer-electronics boards. The verified product information specifically identifies the part as a set-top clock source, clock generator, PLL, and frequency synthesizer, supporting its use in designs requiring coordinated timing from one reference source. Its architecture centers on a 27 MHz crystal or clock reference. This reference can be multiplied or divided through the PLL to obtain the clock signals required by system functions. Exact output-frequency settings, loop bandwidth, output jitter, supply-voltage range, operating-temperature limits, and configuration details are not present in the supplied verified records and must therefore be confirmed against the manufacturer datasheet before schematic release or firmware programming. Typical applications include digital set-top boxes, cable receivers, television front ends, multimedia terminals, and other consumer equipment that requires multiple coordinated clocks. The MK2761ASLF is most appropriate when the board already uses a 27 MHz reference and expects an analog-PLL clock-source solution. Its advantage is consolidation of multiple timing requirements into one dedicated IC rather than relying exclusively on discrete oscillators or separate frequency-generation blocks. Designers should verify all available output frequencies, pin-level enable functions, crystal-load requirements, PLL configuration method, supply sequencing, and output-drive characteristics in the manufacturer datasheet. PCB planning should reserve the exact 16-pin SOIC footprint, provide a short and clean reference path, and follow the recommended grounding and decoupling arrangement. Software or hardware control of the synthesized clocks should also be confirmed before assuming that every output can be independently programmed. This product data consolidates verified distributor classification, package information, pricing availability, and the known 27 MHz analog-PLL architecture. It also identifies the specific datasheet, pinout, lifecycle, compliance, and substitute information that still requires confirmation, helping engineers distinguish documented facts from values that remain unverified.
MK2761ASTR - 27MHz Multi-Output Clock Synthesizer | Renesas (Tape & Reel)
Renesas Electronics MK2761ASTR is a 27MHz clock and frequency synthesizer IC that accepts a crystal or clock input and generates multiple CMOS output clocks for set-top box applications. It uses an analog phase-locked loop (PLL), includes PLL bypass capability, and is housed in a 16-pin SOIC package measuring 0.154 inches, or 3.90 mm, in width. A clock synthesizer is a clock-and-timing integrated circuit that derives one or more stable digital timing signals from a reference oscillator. Clock generation belongs to the oscillator, frequency synthesis, clock management, and timing IC hierarchy before connecting to broader clock-and-timing and semiconductor systems. In consumer equipment, a synthesizer can distribute related reference-derived clocks while reducing the number of separate oscillators required. The MK2761ASTR supports a maximum frequency of 27MHz and accepts either a crystal or external clock. Its CMOS outputs suit digital logic that requires repeatable clock edges, while the PLL-bypass path provides flexibility when the design must use or pass through the reference clock. The 16-pin SOIC package is a surface-mount option compatible with conventional PCB assembly and inspection processes. This device is specifically described for set-top box clock generation, where digital video, audio, control, and interface circuitry may require coordinated timing. It can also be evaluated for other consumer or embedded systems that use a 27MHz reference and need several derived clocks, provided each output frequency, duty cycle, timing level, and load requirement is confirmed against the manufacturer datasheet. The principal design task is verifying the complete output-frequency plan and external crystal or clock network. Board placement should minimize clock routing length and noise pickup, while output loading and trace capacitance should match the device’s stated drive and timing requirements. Because only summary specifications were provided here, voltage ranges, current limits, jitter, output counts, pin functions, and exact frequency ratios require confirmation before release to production. This product record consolidates verified distributor information, package identification, functional characteristics, design cautions, and commercial availability. It also separates confirmed facts from missing datasheet parameters, helping engineers evaluate the MK2761ASTR for new designs, replacements, and set-top box clock-distribution requirements without assuming unverified specifications.
MK2771-15R - 100MHz VCXO Clock Synthesizer | Renesas
Renesas Electronics MK2771-15R is a low-cost, low-jitter VCXO and clock synthesizer IC designed for set-top boxes, with a maximum output frequency of 100 MHz and CMOS clock outputs in a 28-QSOP package. Its on-chip voltage-controlled crystal oscillator accepts a 0 V to 3 V control voltage, allowing the generated clock output to be varied by as much as ±100 ppm. The device includes one PLL, accepts a crystal input, supports a 1:8 input-to-output ratio, and does not use differential clock inputs or outputs. A VCXO is a crystal oscillator whose frequency can be adjusted with an external control voltage. It belongs to the clock oscillator and timing-control hierarchy, where a stable crystal reference is combined with voltage-controlled tuning to compensate for reference-clock errors. A clock synthesizer performs the related function of generating or distributing multiple timing signals. The MK2771-15R integrates these concepts for consumer set-top equipment where adjustable, low-jitter timing is useful without requiring a high-cost external frequency-control solution. Key features include a maximum clock frequency of 100 MHz, a VCXO tuning range of ±100 ppm, a 0 V to 3 V control-voltage range, low-cost implementation, and low-jitter operation. The CMOS output architecture is suitable for digital logic in set-top boxes, while the 1:8 ratio provides a defined relationship between the crystal input and synthesized output. These characteristics make the device relevant to designs requiring a tunable reference clock rather than a completely fixed-frequency oscillator. Technically, the MK2771-15R combines a crystal-based oscillator, voltage-controlled frequency adjustment, and clock-synthesis functions on one integrated circuit. The control voltage applied to the VCXO changes the output frequency around the crystal-defined nominal condition. Its single-circuit implementation simplifies PCB requirements compared with a discrete crystal oscillator plus separate synthesizer. The available data specifies CMOS outputs, a crystal input, and single-ended rather than differential signaling, so downstream circuitry must be designed for the corresponding signal format. Typical uses include set-top box main timing, tuner and video-processing clock distribution, MPEG transport-stream interface clocking, and other consumer television equipment requiring a tunable low-jitter clock source. The device can also serve as a dedicated timing IC in designs where its 100 MHz ceiling and ±100 ppm adjustment capability satisfy the system clock requirements. Designers should verify the exact crystal frequency, loop filtering, output enable behavior, decoupling requirements, and output-drive configuration against the manufacturer datasheet before layout release. The 28-QSOP footprint requires a compact surface-mount layout, while the single-ended CMOS outputs require controlled routing and return paths to minimize clock-edge degradation. This page consolidates the verified manufacturer and distributor information, distinguishes documented parameters from unavailable details, and provides application guidance, purchasing context, and design cautions without presenting unverified specifications as fact.
MK2772-01S - VCXO and Set-Top Clock Source | Renesas
Renesas Electronics MK2772-01S is a low-cost, low-jitter VCXO and clock synthesizer designed for set-top box clocking in a 20-pin SOIC package. It accepts a 13.5 MHz crystal reference and uses an on-chip voltage-controlled crystal oscillator with a 0 V to 3 V control input. The control range produces approximately plus or minus 100 ppm output-frequency variation, while the clock-generation section supports CMOS clock outputs up to 27 MHz. A VCXO, or voltage-controlled crystal oscillator, is a crystal oscillator whose frequency can be adjusted by an external voltage. The MK2772-01S combines this oscillator with an analog phase-locked loop and clock synthesis functions in one clock-and-timing IC. This integration supports set-top box designs that require a stable reference frequency plus one or more derived system clocks without implementing a complete discrete oscillator and PLL subsystem. The principal features include a 13.5 MHz crystal input, a 0 V to 3 V VCXO tuning-control range, approximately plus or minus 100 ppm frequency adjustment, CMOS output technology, and operation from a 4.75 V supply as reported in the verified product data. The integrated PLL includes bypass capability, providing a practical path for system bring-up, test, or clock-source fallback. The 20-SOIC package supports conventional surface-mount PCB assembly. Technically, the device uses MicroClock VCXO and analog PLL techniques to derive clocks from an economical crystal. The tuning voltage provides coarse frequency control where the target equipment needs calibration across cable, tuner, or network synchronization requirements. Because the device is identified as obsolete in verified component listings, engineers should avoid new designs and evaluate current-generation clock generators when creating a new board. Typical uses include legacy set-top box main boards, digital video broadcast receivers, and embedded video equipment requiring a stable 13.5 MHz reference with synthesized CMOS clocks. The component may also appear in industrial or communications equipment designed around the same legacy clock architecture, provided its electrical limits, timing margins, and operating-temperature requirements are verified. Design engineers must confirm the complete pinout, crystal load requirement, output enable behavior, control-voltage polarity, and output-drive configuration against the Renesas datasheet before layout or replacement work. Because the component is obsolete, a mechanically similar clock IC is not automatically a safe replacement: its pinout, supply voltage, PLL architecture, tuning range, and output standards must match. This page consolidates the verified manufacturer and distributor information, lifecycle warning, pricing evidence, candidate replacements, comparison parameters, and practical design cautions for engineers evaluating the MK2772-01S or a legacy-board repair.
MS32340 - Quad 25/28G CDR with Adaptive Equalization
The MS32340 is a four-channel 25.78 Gbps / 28.05 Gbps clock and data recovery (CDR) device with integrated adaptive equalization, supplied in a SIP package. Its primary verified functions are four-channel clock and data recovery, support for both 25.78 Gbps and 28.05 Gbps data rates, and adaptive equalization for channel-loss compensation. The available source identifies the device as the ms32340 (SIP) Quad 25/28G CDR with Integrated Equal, but it does not provide a manufacturer identity, official manufacturer datasheet URL, complete pinout, lifecycle status, pricing, or a detailed electrical specification table. A CDR is a signal-integrity semiconductor that recovers a usable clock from a serialized high-speed data stream and aligns data with that recovered timing reference. In the broader hierarchy, a CDR is a clock-and-timing IC, a high-speed interface component, and part of the semiconductor family used in optical and copper data links. Adaptive equalization compensates for frequency-dependent channel loss encountered when data travels through connectors, printed-circuit-board traces, cables, or other interconnect media. Integrating equalization with clock and data recovery can reduce the number of separate high-speed signal-chain blocks required. The verified MS32340 description identifies four channels and two principal rates: 25.78 Gbps and 28.05 Gbps. These rates are suitable for evaluating next-generation high-speed links, but the supplied data does not state the associated line rate standard, modulation format, reference-clock requirement, equalization reach, jitter performance, power consumption, or operating temperature. It also does not specify whether the device transmits data, receives data, or performs both directions. Those details must be obtained from the original manufacturer documentation before schematic capture or production release. The part is identified as a SIP device, but the available source does not state pin count, body dimensions, lead spacing, thermal resistance, mounting orientation, or supported package variant. Because no authoritative manufacturer datasheet was supplied, the pinout is left null rather than reconstructed from secondary listings. Similarly, the device’s RoHS, REACH, AEC-Q100, lead-free, and halogen-free status cannot be inferred from the product category. MS32340 should be treated as a specialized high-speed CDR rather than a general-purpose regulator or microcontroller. Its integrated adaptive equalization makes it a candidate for prototype evaluation in high-speed communications equipment, optical-module signal paths, backplane links, and test equipment. The key design risk is incomplete documentation: system integrators should verify all timing, reach, loss-tolerance, power, and interface specifications against the manufacturer’s approved datasheet and reference designs. This page preserves only the verified MS32340 facts and does not invent missing electrical or commercial values.
NB3N502DR2G - 14-190 MHz PLL Clock Multiplier, SOIC-8 | onsemi
The onsemi NB3N502DR2G is a 14 MHz to 190 MHz Phase-Locked-Loop (PLL) clock multiplier IC housed in an 8-pin SOIC (3.90 mm narrow body) package that accepts a 2 MHz to 50 MHz fundamental-mode crystal or external reference clock and generates a low-jitter TTL/CMOS-level output clock at a precise multiple of the input reference. The device operates from a single 3.3 V or 5.0 V supply and delivers a 50 percent duty cycle output up to 190 MHz, making it a cost-effective replacement for discrete crystal oscillators in digital systems that need a multiplied reference clock. According to the onsemi datasheet, the input clock frequency range is 2 MHz to 50 MHz and the output frequency range is 14 MHz to 190 MHz with sub-nanosecond period jitter, providing clean timing for high-speed digital logic. A PLL clock multiplier is a feedback-controlled oscillator that phase-locks a Voltage-Controlled Oscillator (VCO) to a lower-frequency reference, allowing the system to derive a high-frequency clock from a low-frequency, low-cost crystal. In the broader taxonomy, the NB3N502 belongs to the clock-generator / frequency-synthesizer family of timing ICs, sitting beneath clock buffers and above generic phase-locked loops in the timing-and-signal-conditioning hierarchy of power management and signal-chain semiconductors. PLL multipliers are commonly used when a stable, low-jitter high-frequency clock is required but only a low-frequency crystal is available, or when the reference frequency must be precisely scaled to meet downstream logic requirements. Key features include TTL/CMOS-compatible output drive, internal loop filter components, and a wide industrial operating temperature range of -40 degrees C to +85 degrees C. The device integrates the PLL, VCO, and output divider on a single monolithic CMOS die, eliminating external loop-filter design. Its pin-selectable multiplier ratios (when applicable) and standard SOIC-8 footprint simplify drop-in replacement of legacy clock-generator circuits. The NB3N502DR2G is also Pb-free and supplied on a 2500-piece reel, suitable for high-volume surface-mount assembly. The architecture uses a digital phase-frequency detector driving an on-chip charge pump and VCO, with the multiplied output divided back to the reference frequency to close the loop. This analog PLL approach yields much lower jitter than simple frequency doublers built from XOR gates or delay lines, which is critical for downstream microcontrollers, FPGAs, and communications ASICs that derive internal clocks from the multiplied reference. The single-supply 3.3 V/5 V operation also simplifies integration into mixed-voltage designs without level shifters on the supply rail. Typical applications include replacing crystal oscillators in networking equipment, generating CPU/FPGA reference clocks in embedded systems, producing pixel clocks for video and display controllers, and providing low-jitter timing in industrial automation and instrumentation. The NB3N502DR2G is also widely used as a low-cost clock source for microcontroller (MCU) families that require an external multiplied reference. When designing with the NB3N502DR2G, ensure the input reference drive level meets the datasheet-specified VIH/VIL thresholds and that the PCB layout keeps the input trace short to minimize reflections. Decouple VDD3VCC with a 0.1 ohm ceramic + 10uF bulk capacitor pair, and place the load capacitor (when applicable) close to the IC to control output rise and fall characteristics.
NB3V1104CMTTBG - 1:4 LVCMOS Fanout Buffer 250MHz | onsemi
The onsemi NB3V1104CMTTBG is a 1:4 LVCMOS clock fanout buffer rated for operation up to 250 MHz, supplied in an 8-pin WDFN (2x2 mm) package. It accepts 3.3 V, 2.5 V, or 1.8 V LVCMOS input levels and produces four low-skew LVCMOS outputs. The device is part of the modular NB3V110xC family of low-skew, general-purpose LVCMOS clock buffers from onsemi. A clock buffer (or clock fanout buffer) is a timing component that receives a single reference clock on its input and reproduces multiple copies of that clock on its outputs. Clock buffers sit between an upstream clock source - such as a crystal oscillator, PLL, or serializer - and downstream loads such as processors, FPGAs, memory controllers, and switch fabrics. Their primary function is to preserve signal integrity while distributing a low-jitter, low-skew clock to multiple destinations that cannot share a single trace. Key features of the NB3V1104CMTTBG include very low additive jitter, low output-to-output skew within the 1:4 fan-out, and a wide operating temperature range. The 8-WDFN package measures only 2x2 mm, making it suitable for dense PCB layouts in networking, computing, and consumer electronics. Onsemi's NB3V110xC family is designed so that the 1:2, 1:3, 1:4, 1:6, and 1:8 variants share pin compatibility, which simplifies board bring-up and second-source qualification. Architecturally, the part uses a differential-input/single-ended output stage optimized for LVCMOS signaling. The input is designed to be driven by a 3.3 V, 2.5 V, or 1.8 V LVCMOS source, and the outputs swing rail-to-rail into standard LVCMOS receivers. Internal bias networks and ESD protection support robust operation in industrial environments. Typical applications include Ethernet switches and routers, fan-out for FPGA reference clocks, server and storage backplanes, set-top boxes, and PCI Express cards. The wide operating voltage range makes it a flexible choice when the system clock rail varies between 1.8 V and 3.3 V across board revisions. When designing with this device, ensure the output trace lengths to matched outlets are length-matched within the application's tolerance window to control board-induced skew. Place a 0.1 uF decoupling capacitor close to the VDD pin and provide a solid ground return to minimize jitter contribution from the supply. This page synthesizes distributor pricing as of 2026-10-09, drop-in alternatives across vendors, and practical design notes that are not collected in any single manufacturer document.
NBXDBB017LNHTAG - 156.25/312.5 MHz LVPECL XO Oscillator | onsemi
The onsemi NBXDBB017LNHTAG is a 3.3 V dual-frequency LVPECL crystal oscillator (XO) housed in a 6-pin CLCC (7x5 mm) surface-mount package. It provides selectable output frequencies of 156.25 MHz and 312.5 MHz using a high-Q fundamental crystal combined with an integrated PLL multiplier, delivering ultra-low jitter and phase-noise performance required for high-speed serial links. A crystal oscillator (XO) is a self-contained timing device in which a quartz resonator and an active oscillation/buffering circuit are co-packaged; unlike a bare crystal, an XO outputs a clean, conditioned logic-level clock and does not require external load capacitors. Within the broader clock-tree hierarchy, XOs sit above crystal units and below clock generators/buffers (and fanout buffers like LVPECL drivers), serving as the primary frequency reference for Serializer/Deserializer (SerDes) PHYs, FPGAs, network processors, and ASICs in telecom, datacom, and embedded systems. Key features of the NBXDBB017LNHTAG include a 3.3 V single supply, LVPECL differential outputs, frequency select via a control pin, typical RMS jitter on the order of single-digit picoseconds over 12 kHz to 20 MHz, and an industrial operating temperature range suitable for outdoor and uncontrolled thermal environments. The 6-CLCC package offers a small footprint with a hermetic ceramic body, which improves reliability under thermal cycling and mechanical stress compared with plastic molded oscillators. Technically, the device pairs a fundamental-mode crystal with a PLL multiplier block that synthesizes the second harmonic (312.5 MHz) from the 156.25 MHz fundamental; the output stage is an LVPECL driver that produces complementary ECL-style swings around a VCC-1.3 V common-mode voltage. LVPECL is preferred at these data rates because it provides low common-mode noise, high edge rates, and good immunity to supply noise relative to LVCMOS at multi-hundred-MHz frequencies. Typical applications include 1G/10G Ethernet PHY reference clocks, Fibre Channel and SONET/SDH line cards, PCIe and RapidIO reference inputs, FPGA logic-clock inputs, and clock trees for switches and routers. The selectable dual frequency lets one BOM line serve boards that need both the base rate and the doubled rate. When designing with this part, place it adjacent to the receiver IC, keep LVPECL traces length-matched within a few mils, terminate each side with the standard 50 ohm to VTT network, and provide solid 0.1 uF plus bulk-decoupling on the supply pin. The frequency-select pin should be tied directly to logic, not floated, to avoid undefined output behavior. This page synthesizes distributor pricing, drop-in compatible onsemi alternates, and practical PCB-layout guidance that the bare manufacturer datasheet does not consolidate in one place.
NE555P - Single Precision Timer, 100kHz, DIP-8 | Texas Instruments
The Texas Instruments NE555P is a precision bipolar timer IC in an 8-pin PDIP (DIP-8) package, capable of producing accurate time delays or oscillation from microseconds to hours. It supports astable (oscillator) and monostable (one-shot) operating modes, with timing set by a single external resistor-capacitor network. The 555 timer is a classic analog building block that combines a precision voltage divider, two comparators, an internal flip-flop, and a high-current discharge transistor into one 8-pin device. Its role in modern electronics places it under the clock & timing / signal generation hierarchy, serving as a low-cost alternative to microcontroller timing or dedicated oscillator chips in non-critical timing paths. Key specifications include a maximum operating frequency of 100 kHz (up to 500 kHz depending on datasheet parameter), a supply voltage range of 4.5V to 16V, and a TTL-compatible output that can sink or source up to 200 mA. The bipolar architecture provides robust output drive capability, making it suitable for directly driving relays, LEDs, buzzers, and other loads without an external driver stage. The internal design uses three 5kΩ resistors forming the reference divider (giving the 555 its namesake), a discharge transistor for capacitor reset, and a set/reset flip-flop that latches trigger and threshold events. Threshold and trigger levels are set at 2/3 VCC and 1/3 VCC respectively, providing predictable timing independent of supply voltage within specified limits. Typical applications include precision timing circuits, pulse generation, sequential timing, missing-pulse detection, and LED/relay drivers. The 200 mA output drive eliminates the need for buffer transistors in most direct-load designs, while the bipolar simplicity ensures reliable operation in hobby, educational, and industrial control systems. When designing with the NE555P, add a 0.01 μF bypass capacitor directly across the VCC and GND pins to suppress supply noise that could couple into the timing comparators. For astable oscillators, ensure the timing capacitor has low leakage (film or quality electrolytic) because leakage current directly degrades frequency accuracy above 10 kHz. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
NE555PE4 - 555 Timer 100kHz PDIP-8 Precision | Texas Instruments
The Texas Instruments NE555PE4 is a single-precision 555-type timer/oscillator IC housed in an 8-pin PDIP (through-hole) package, supporting timing from microseconds to hours with astable or monostable operating modes. The part delivers a frequency range from 1mHz to 100kHz, operates from 4.5V to 16V, and sources/sinks up to 200mA at TTL-compatible output levels. What is a 555 timer? A 555 timer is a highly integrated analog building block that combines a voltage divider, two comparators, an RS flip-flop, and a discharge transistor into one IC. It belongs to the broader clock-and-timing IC family (clock & timing IC > programmable timer > 555 timer > bipolar timer IC), sitting alongside counters and PLL devices. Within a power-and-signal chain, the 555 timer provides a low-cost means of generating precise time delays, square waves, and pulses, making it a foundational part of hobby, industrial, and educational electronics. Key features include adjustable duty cycle, TTL-compatible output that can both sink and source up to 200mA, astable/monostable operating modes, and timing accuracy of typically better than 1% with stable external RC components. The internal architecture uses a precision voltage divider (three 5k resistors - hence '555'), two comparators, a flip-flop, and an open-collector discharge transistor, all of which are accessible via the eight external pins. Typical applications include pulse generation, sequential timing, precision timing, missing-pulse detection, bounce-free switches, linear ramp generators, and PWM modulators. Industrial designers favor the NE555PE4 because of its rugged bipolar design and wide supply tolerance. A common design consideration is output current capability: the device can sink/source up to 200mA, so a small heat-sinking consideration applies when operating at high duty cycles near the supply rails. Designers should also keep the discharge transistor's collector voltage within ratings and ensure timing capacitors have low leakage to maintain accuracy. Compared to CMOS variants such as the TLC555, the bipolar NE555 draws more quiescent current but offers higher output drive. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers rapidly evaluate fit and source the NE555PE4 for new or legacy designs.
PCA8525TKX - Nano-Power Automotive RTC IC, I2C | NXP
The NXP Semiconductors PCA8525TKX is a high-accuracy, nano-powered Real Time Clock (RTC) and calendar IC with integrated temperature compensation, an I2C-bus interface, and a temperature rating up to 125 C in a 10-lead HVSON package. It is the first RTC IC with an external crystal to feature a default temperature compensation engine, selectable between crystal curvature coefficients of -0.035 ppm/degC2 or -0.04 ppm/degC2. An RTC (real-time clock) IC is a timekeeping device that maintains seconds, minutes, hours, day, weekday, month, and year information with a 32.768 kHz watch crystal. Within the power-management and timing semiconductor hierarchy, RTC ICs form a specialized subset of clock and timing ICs optimized for ultra-low standby current rather than frequency output. RTCs run continuously even when the main processor is off, so battery-backed timekeeping accuracy and supply current are their defining metrics. Key features of the PCA8525 include nano-power supply current for extended battery life, an integrated digital temperature compensation engine that can deliver up to 5x better timekeeping accuracy than a standard uncompensated RTC, and a selectable crystal temperature model. An aging offset register further corrects long-term crystal drift, keeping timekeeping error within minutes per year rather than tens of minutes. The compensation engine periodically measures the die temperature and digitally adjusts the clock, compensating the parabolic frequency-versus-temperature characteristic of tuning-fork crystals. Because compensation is performed on-chip, no external thermistor, lookup table, or MCU overhead is needed. The I2C interface transfers all addresses and data serially, simplifying integration with any host microcontroller. Typical applications include automotive body control modules and gateway ECUs rated to 125 C ambient, smart meters, industrial dataloggers, and battery-powered IoT endpoints where both accuracy and nano-amp timekeeping current are critical. The automotive qualification makes it especially suitable for under-hood-adjacent modules requiring AEC-grade reliability. Design consideration: crystal selection matters. The compensation engine assumes a typical tuning-fork crystal model; verify that the chosen crystal's curvature coefficient matches the selectable -0.035 or -0.04 ppm/degC2 setting for guaranteed accuracy. This page synthesizes distributor sourcing data, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet.
PCF2123BS/1 - SPI RTC Calendar IC | 16-HVQFN | NXP
The NXP Semiconductors PCF2123BS/1 is a CMOS Real-Time Clock (RTC) and calendar with a Serial Peripheral Interface (SPI-bus) operating up to 6.25 Mbps, supplied at 1.1 V to 5.5 V, packaged in a 16-pin HVQFN exposed-pad package. It integrates time-of-day, calendar, alarm, timer and interrupt functions with an integrated 32.768 kHz crystal resonator space on chip, drawing less than 100 nA at 2.0 V for ultra-low standby power. A Real-Time Clock (RTC) is a dedicated integrated circuit that maintains accurate time and date information independent of system power. RTCs sit within the broader category of power management companions and timing ICs, working alongside MCUs, FPGAs and SoCs to provide timekeeping during main-power-off conditions through a small backup cell or supercapacitor. They typically expose time registers in BCD format and communicate over serial buses such as I2C or SPI. The PCF2123BS/1 uses SPI for higher throughput where speed and noise immunity matter. Key features include a wide 1.1 V to 5.5 V supply range, less than 100 nA typical current consumption at 2.0 V, integrated alarm and timer functions, an interrupt output, and a wide operating temperature range suitable for industrial environments. The device is supplied in a compact 3 mm x 3 mm HVQFN-16 plastic package with a thermal pad, drawing less than 0.2 microW of power to support battery-backed operation. The PCF2123BS/1 uses CMOS logic and on-chip tuning, allowing timekeeping accuracy to be compensated via load and trim registers. The SPI interface supports a maximum data rate of 6.25 Mbps, enabling fast register access by host processors. The integrated power-on reset and trickle charger functionality simplify backup power design. Typical applications include battery-backed timekeeping in metering, data loggers, industrial controllers, white goods and IoT sensor nodes, and any portable embedded system that needs a low-power accurate wall-clock reference independent of the main MCU. When designing with this device, place a 100 nF decoupling capacitor close to VDD and connect the exposed thermal pad to a clean ground pour. Always handle the SPI chip-select correctly to avoid bus contention with other peripherals on the same SPI bus. The NXP product page notes End-of-Life status, so check availability before new designs. This page synthesizes distributor pricing, drop-in compatible alternatives, and practical design notes not consolidated in the manufacturer datasheet, providing engineers with a faster decision path.
PCF85263ATT/AJ - Tiny RTC I2C 400kHz, Battery Switch-Over | NXP
The NXP Semiconductors PCF85263ATT/AJ is a CMOS Real-Time Clock (RTC) and calendar optimized for ultra-low power consumption with automatic battery switch-over on main power loss, supplied in an 8-pin TSSOP (also called 8-MSOP, 3.00 mm width) package. It communicates through a 400 kHz I2C-bus and integrates three time-log registers, a clock output, two independent alarms, and a timestamp input that records power-down/power-up transitions. Programmable via 16-bit registers, the PCF85263ATT/AJ provides century, year, month, day, weekday, hours, minutes, and seconds with leap-year correction up to the year 2099, making it suitable for long-lifecycle embedded designs. An RTC (Real-Time Clock) is a low-power oscillator-plus-counter peripheral that maintains wall-clock time independently of the host MCU. RTCs are members of the broader timer/clock IC family, which also includes timer ICs and stop-watch counters. In the system hierarchy, an RTC sits beneath power management and above discrete passives, providing a battery-backed time reference for microcontrollers that would otherwise need to keep time via software timers and a separate 32.768 kHz crystal. By integrating the crystal load capacitors, the battery switch-over MOSFET, and the I2C interface into a single IC, the PCF85263ATT/AJ reduces BOM count and PCB area compared to discrete RTC designs. Key features include 4 time-of-day alarms with timestamp, integrated 32.768 kHz crystal load capacitors (12.5 pF), supply voltage range of 0.9 V to 5.5 V with separate battery supply input, low typical current of 0.55 uA at VDD=3.3 V, and an operating temperature range of -40C to +85C. Three time-log registers are triggered by battery switch-over and input-driven events, supporting forensic power-event capture. The device can also be configured as a stop-watch (elapsed time counter), adding flexibility for metering and instrumentation use cases. The PCF85263A architecture uses a low-power 32.768 kHz crystal oscillator with selectable load capacitance, a BCD-based time counter chain, and a power-management block that arbitrates between VDD and the backup battery. The I2C-bus runs up to 400 kHz in fast mode, and the slave address is fixed (per the manufacturer datasheet). The 8-TSSOP footprint (TSSOP-8 / MSOP-8 outline, 3.0 mm body) is pin-compatible with industry-standard RTCs, enabling drop-in PCB reuse. Typical applications include smart metering (electricity, gas, water), IoT battery-powered sensors, industrial data loggers, white goods, point-of-sale terminals, medical portable devices, and any embedded system requiring timekeeping during main-power loss. The wide 0.9 V to 5.5 V supply range lets the same part serve as backup for a coin cell, a supercapacitor, or a rechargeable battery. When designing with this device, place the 32.768 kHz crystal as close to the XIN/XOUT pins as possible, keep the traces short and symmetric, and add a guard ground to minimize noise coupling. The VBACKUP pin requires a series resistor per the manufacturer datasheet when charged by a supercapacitor. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet. Citations are anchored to the NXP PCF85263A datasheet (per the manufacturer datasheet), DigiKey product page, and Mouser product page.
PCF8563BS/4,118 - 1mA I2C RTC | 400kHz | HVSON-10 | NXP
The NXP PCF8563BS/4,118 is a CMOS Real-Time Clock (RTC) and calendar optimized for low power consumption, providing year, month, day, weekday, hours, minutes, and seconds based on an external 32.768 kHz quartz crystal. Housed in a 10-pin HVSON (3x3 mm, SOT650-1) exposed-pad package, it communicates via a 400 kHz I2C (2-wire) serial interface and operates from a 1.8 V to 5.5 V supply. According to the NXP datasheet, the device integrates a programmable clock output, an interrupt output, and a voltage-low detector in a footprint of approximately 3x3 mm. What is an RTC? A Real-Time Clock is a dedicated integrated circuit that maintains accurate wall-clock time (date and time) independent of the main system processor, typically referenced to a 32.768 kHz quartz crystal. RTCs sit hierarchically as follows: RTC -> clock/calendar IC -> timing device -> mixed-signal IC -> semiconductor. Unlike software-based timekeeping derived from a microcontroller's oscillator, an RTC continues counting while the host MCU is in deep sleep or powered down, making it the standard solution for battery-backed time-of-day tracking. Key features of the PCF8563BS/4,118 include a maximum clock supply current of 1 mA typical at 32 kHz, an integrated I2C slave interface running up to 400 kHz, a programmable square-wave clock output (32.768 kHz, 1024 Hz, 32 Hz, 1 Hz), an open-drain interrupt output, and an on-chip power-on reset plus voltage-low detector. These features let the host MCU wake only on calendar or alarm events, which minimizes total system energy use. The device uses a low-power CMOS architecture with separate oscillator and timing registers, achieving the typical sub-1 microampere backup current needed for coin-cell battery operation. All 16 RTC registers and the 32.768 kHz trimming circuit are accessed over the standard I2C bus at slave address 0x51 (101 0001b), enabling easy drop-in replacement into designs that already use the PCF8563 footprint. Typical applications include battery-backed wall-clock modules for metering and data loggers, timekeeping in IoT sensor nodes, alarm and timer functions in white goods, point-of-sale terminals, and any embedded system requiring calendar accuracy during MCU sleep or power loss. The wide 1.8 V to 5.5 V supply range also makes it suitable for 3.3 V and 5 V microcontroller rails. When designing with the PCF8563, ensure the 32.768 kHz crystal load capacitance matches the oscillator's specified CL (typically 12.5 pF) and add a small decoupling capacitor on VCC. The exposed thermal pad of the HVSON-10 package should be soldered to the ground plane for mechanical stability and improved thermal dissipation. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single source for sourcing, selecting, and implementing the PCF8563BS/4,118.
PCF8563T/5 - I2C Real-Time Clock/Calendar IC | NXP | SOIC-8
The NXP PCF8563T/5 is a CMOS Real-Time Clock (RTC) and calendar optimized for low power consumption, supplied in an 8-pin SOIC (SOT96-1 / MO-012) surface-mount package. It is accessed through a two-line bidirectional I2C-bus at a maximum clock rate of 400 kbit/s, and features a programmable clock output, an interrupt output, and an integrated voltage-low detector for backup-battery switching. The device operates from a 1.8 V to 5.5 V supply and draws only a fraction of a microampere from the backup cell. What is a Real-Time Clock IC? An RTC is a dedicated timing integrated circuit that maintains accurate wall-clock time (seconds, minutes, hours, day, date, month, year) independent of the host system, typically backed by a small backup cell or supercapacitor. RTCs belong to the broader hierarchy of clock-and-timing ICs, which includes oscillators, PLL synthesizers and timers. Within the timekeeping sub-category, I2C RTCs such as the PCF8563 sit alongside SPI and parallel-interface RTCs, providing battery-backed timekeeping for embedded designs. Key features of the PCF8563T/5 include an integrated 32.768 kHz oscillator (0.0320 MHz reference) that requires only an external quartz crystal, a BCD-coded register map for sub-second resolution free software access, a selectable 32.768 kHz or programmable frequency clock output on CLKOUT, and a low-battery detection flag. The integrated voltage-low detector automatically switches between main supply and backup source without external MOSFETs, simplifying battery-backed designs. The PCF8563 uses a CMOS process with on-chip load capacitors matched to standard 32.768 kHz tuning-fork crystals, eliminating the need for external load caps in most applications. The address-and-data I2C protocol includes automatic register-increment for sequential reads (block read of all time/date registers in one transaction) and a slave address of 0x51 (write) / 0x53 (read) fixed by the part. Typical applications include battery-backed timekeeping in metering equipment, point-of-sale terminals, data loggers, white goods and consumer electronics, industrial controllers requiring timestamps, and any embedded system needing a low-power always-on calendar function. A wide 1.8 V to 5.5 V operating range lets the same part span single-cell Li-ion designs and 5 V industrial buses. When designing with this device, reserve the SDA and SCL pins with proper pull-ups to VCC (typically 4.7 kohm at 400 kHz), and place the 32.768 kHz crystal as close to OSCI/OSCO as possible to minimize stray capacitance. Backup-battery drain is dominated by the oscillator current; check the datasheet's Ibat figure to size your backup source. This page synthesizes distributor pricing, drop-in alternatives and practical design notes not found in the manufacturer datasheet alone.
PCF8593T/1,118 - I2C RTC Clock/Calendar, 8-SOIC | NXP Semiconductors
The NXP Semiconductors PCF8593T/1,118 is a CMOS Real-Time Clock (RTC) and calendar circuit optimized for low power consumption, housed in an 8-pin SOIC (SOT96-1) package. The device provides an 8-bit serial interface over the industry-standard I2C (2-wire) bus, supports a supply voltage range of 2.5 V to 6.0 V, and integrates a 32.768 kHz oscillator circuit that drives timekeeping, calendar, and counter functions in the first 8 bytes of internal RAM. A Real-Time Clock (RTC) is a dedicated integrated circuit that keeps track of current time and date (typically seconds, minutes, hours, days, weekdays, months, years) even when the main system power is removed, usually backed by a small battery or supercapacitor. Within the broader component taxonomy, an RTC sits under the clock & timing category, which itself is a subset of integrated circuits. RTCs are essential building blocks for any embedded design that needs time-of-day awareness: from data loggers and metering equipment to industrial controllers and consumer appliances. The PCF8593 represents the classic low-power serial-RTC architecture that has dominated I2C-based designs since the 1990s. Key features of the PCF8593T/1,118 include 240 bytes of general-purpose static RAM available beyond the timekeeping registers, a programmable 32.768 kHz oscillator with on-chip load capacitors, automatic word-address increment after each read/write byte, a 24-hour or 12-hour format option, and low standby current in the microamp range. The 8-SOIC package is industry standard (3.90 mm body width), making the device drop-in compatible with the classic 8-pin DIP footprint pad layout when designed with the SOIC land pattern. The internal address counter eliminates the need for burst-mode addressing in firmware, simplifying I2C driver code. Typical applications include battery-backed wall-clock modules for appliances, time-of-day stamping in metering and data-acquisition systems, low-power sensor nodes that wake periodically and need an accurate timestamp, industrial programmable logic controllers (PLCs) that log events, and consumer electronics such as VCRs, set-top boxes, and audio gear that must retain clock time across power cycles. When designing with this part, place the 32.768 kHz watch crystal as close as possible to the OSCO/OSCI pins to minimize parasitic capacitance, ensure the I2C pull-up resistors are sized correctly for the bus capacitance, and keep the backup battery path well-decoupled to survive brown-outs. The part is approaching end-of-life per the NXP product page, so designers should evaluate the PCF85263A or PCF8563 as pin-compatible modern replacements for new designs.
PI6C557-03AQE - PCIe 2.0 Spread Spectrum Clock Generator | Diodes Inc
The Diodes Incorporated PI6C557-03AQE is a spread-spectrum clock generator compliant with PCI Express 2.0 and Ethernet timing requirements, packaged in a 16-pin QSOP (also referenced as 16-SSOP by some listings). The part accepts a 25 MHz fundamental-mode crystal reference and produces two pairs of differential HCSL outputs at user-selectable frequencies of 25 MHz, 100 MHz, 125 MHz, and 200 MHz. Spread-spectrum modulation is applied through a proprietary PLL architecture to substantially reduce electromagnetic interference (EMI) on the system reference clock. A spread-spectrum clock generator is a timing device that intentionally modulates the output frequency around a center value at a low modulation rate. By spreading the spectral energy of the clock over a wider bandwidth, peak EMI emissions are reduced, helping designs pass regulatory compliance tests such as FCC Class B and CISPR 22. Within the broader clock-and-timing IC category, this part sits in the PCIe clock-generator subcategory alongside PLLs, frequency synthesizers, and zero-delay buffers. Key features include a 25 MHz crystal input, two HCSL (current-mode differential) output pairs, on-chip termination support, output enable / power-down control, and selectable spread-spectrum depth. HCSL is the signaling standard required by PCIe 2.0/3.0 reference clocks and is also used in mainstream Ethernet PHYs. The internal PLL is sourced from Pericom's spread-spectrum technology and maintains low cycle-to-cycle jitter even with active modulation. Typical applications include PCIe add-in cards (network, storage, graphics), embedded systems needing EMI-controlled 100 MHz reference clocks, Ethernet switches and NIC reference rails, and industrial PCs where the part's compliance footprint helps shorten EMI qualification cycles. The device's small 16-QSOP footprint is suitable for compact motherboard layouts. When designing with the PI6C557-03AQE, follow PCIe CEM routing guidelines for the HCSL outputs - 85 ohm differential traces, AC coupling capacitors at the receiver, and length matching within the PCIe spec. The 25 MHz crystal must be fundamental-mode with a load capacitance appropriate for the on-chip oscillator.
PI6C557-03LEX - 200MHz PCIe Clock Generator | Diodes
The Diodes Incorporated PI6C557-03LEX is a 200 MHz PCI Express and Ethernet clock generator with two differential HCSL outputs, supplied in a 16-TSSOP package. It accepts a 25 MHz crystal input and uses Pericom PLL techniques to generate selectable 25 MHz, 100 MHz, 125 MHz, and 200 MHz clock frequencies. The verified distributor data identifies a 3.3 V supply, a -40°C to +85°C operating range, and two clock outputs. Its clock-generation and spread-spectrum functions position it within the clock and timing IC category as a phase-locked-loop-based timing device for high-speed digital systems. A clock generator produces reference and data-rate clocks for digital circuits that require stable timing, phase control, and predictable edge placement. In a PCI Express system, a spread-spectrum clock can reduce electromagnetic-interference peaks by distributing clock energy over a frequency band. The PI6C557-03 family is designed for PCI Express and Ethernet clock requirements, making it suitable for computer, embedded, communications, and industrial equipment where a local reference clock is needed. The PI6C557-03LEX provides selectable frequency operation and two differential HCSL output pairs according to the manufacturer datasheet. Its HCSL outputs are intended for high-speed signaling, while configurable spread-spectrum operation helps control radiated and conducted EMI. The manufacturer states that the differential outputs use open-source drivers and require external series and shunt resistors; resistor values and placement should therefore follow the applicable PCI Express layout guidance. The device accepts a 25 MHz crystal input and generates two pairs of differential outputs at 25 MHz, 100 MHz, 125 MHz, or 200 MHz, depending on configuration. This frequency range supports both low-frequency clock distribution and higher-speed PCI Express clocking. The 3.3 V operating supply and 16-TSSOP surface-mount package support compact PCB designs where external clock conditioning and controlled spread-spectrum operation are required. Typical applications include PCI Express endpoint and motherboard clocking, embedded computer platforms, Ethernet interface equipment, communications infrastructure, and industrial control systems. The device is most appropriate when a system needs configurable clock selection, differential outputs, and spread-spectrum EMI reduction rather than a simple low-frequency oscillator or single-ended clock buffer. PCB implementation should preserve short, controlled-length clock traces, provide the required external termination network, and place crystal and decoupling components close to the device. Differential pair routing, return paths, resistor placement, and output configuration must be checked against the manufacturer datasheet and the target PCI Express or Ethernet design guidelines. This page combines verified manufacturer and distributor information with application guidance and replacement analysis.
PI6CG33A06ZLFEX - 6-Output PCIe 7.0 Clock Generator | Diodes Inc
The Diodes Incorporated PI6CG33A06ZLFEX is an ultra-low-jitter, 6-output PCIe 5.0/6.0/7.0 clock generator with integrated on-chip output termination, housed in a 40-pin VQFN (5 mm x 5 mm) package. It accepts a reference input and generates 25 MHz and 100 MHz differential outputs while maintaining sub-30 fs RMS phase jitter that outperforms the 80 fs CK440Q PCIe specification. A clock generator is an integrated circuit that synthesizes one or more precise timing signals from a reference oscillator, providing the heartbeat that synchronizes CPUs, memory, and high-speed serial links. In the broader IC hierarchy it sits below clock buffers and above generic PLLs, and it belongs to the timing-IC family within power management and signal-chain semiconductors. Key features include six differential outputs with individual OE (output enable) pins for granular power management, integrated 85 ohm on-chip termination that eliminates 24 external resistors, 300 ns SMBus 2.0-compatible data hold time, and support for PCIe Gen 1/2/3/4/5/6/7 standards. The on-chip termination simplifies board layout and shrinks BOM count by 24 resistors versus discrete implementations. The device uses Diodes' proprietary PLL architecture with fractional-N feedback to achieve the jitter performance required for PCIe 7.0 while maintaining backward compatibility with PCIe 5.0 and 6.0. Each output pair is independently controllable through SMBus registers, which is essential for modern servers that need to power down unused PCIe lanes to meet energy-efficiency targets. Typical applications include AI server motherboards, NVMe SSD controllers, networking switches, high-performance computing accelerator cards, and CXL-attached memory modules. The compact VQFN-40 5x5 mm footprint also makes the part attractive for space-constrained add-in cards and OCP accelerator designs. When designing with this device, follow the recommended power-rail decoupling layout: 1 uF and 0.1 uF ceramic capacitors placed within 2 mm of each supply pin. Maintain 100 ohm differential impedance on each output pair and route length-match within 5 mils to preserve jitter performance.
PI6CG33A06ZLFEX-13R - 6-Output PCIe 5.0/6.0/7.0 Clock Generator | Diodes Inc
The Diodes Incorporated PI6CG33A06ZLFEX-13R is a 6-output ultra-low jitter clock generator designed to meet the demands of the PCI Express 7.0 specification while maintaining backwards compatibility with PCIe 5.0 and 6.0. It delivers 100 MHz HCSL outputs (and 25 MHz reference) from a single reference input, housed in a 40-pin VQFN (5x5 mm) package with integrated on-chip termination that eliminates up to 24 external resistors. Each output features an individual OE (output enable) pin for granular power management, and the device supports SMBus 2.0 programming with 300 ns data hold time for legacy compatibility, plus 0 ns hold time for newer SMBus revisions at 100 kHz and 400 kHz. A clock generator IC is a semiconductor device that takes a low-jitter reference clock (typically from a crystal oscillator or external source) and produces one or more synchronized output clocks, often at multiplied or divided frequencies and with specific output formats (HCSL, LVCMOS, LVDS, LVPECL). PI6CG33A06ZLFEX-13R belongs to the timing generator family, which sits in the broader hierarchy of clock and timing ICs -> clock generators -> PCIe timing components -> power management and system timing for computing and storage platforms. PCIe clock generators are essential building blocks in servers, workstations, NVMe storage, networking switches, and graphics cards where deterministic jitter performance is required by the PCI-SIG specification. Key features include ultra-low additive jitter to meet PCIe 7.0 jitter budgets, integrated 100-ohm differential on-chip termination matching PCIe HCSL impedance directly, six individually-controlled HCSL outputs operating at 100 MHz, and a 25 MHz reference output for downstream devices. The 3.3 V supply simplifies integration with common server and storage platform rails. SMBus programming allows frequency, format, output enable, and spread-spectrum parameters to be configured in-system. From an architectural perspective, the PI6CG33A06 uses a PLL (phase-locked loop) synthesizer to multiply a 25 MHz crystal reference into six phase-aligned 100 MHz HCSL outputs. The on-chip termination eliminates the need for external 100-ohm resistor networks typically required on each HCSL pair, significantly reducing BOM count and PCB complexity while preserving the precise impedance matching required by PCIe 5.0/6.0/7.0 physical-layer compliance testing. Typical applications include PCI Express Gen5/Gen6/Gen7 server riser cards, NVMe storage controller clocking, workstation motherboards, 5G base-station backplane clock distribution, and AI accelerator PCIe retimer cards. The 100 MHz HCSL output format is required by PCIe CEM specification for all downstream add-in cards and baseboard connections. When designing with this device, place 0.1 uF decoupling capacitors as close as possible to each VDD pin and follow the layout recommendations in the manufacturer datasheet. Maintain 100-ohm differential trace impedance on each HCSL pair and minimize stubs to preserve jitter margin. Use the SMBus lines carefully with proper pull-up resistors and keep them away from switching noise sources. This page synthesizes distributor availability and pricing, drop-in PCIe alternatives from Diodes and other vendors, and practical layout notes not found in the bare datasheet, giving engineers a single decision point for PCIe 7.0 clock tree selection.