クロック＆タイミング
製品 (160)
9ZXL0831AKLF - 8-Output 147MHz Low-Power Buffer | Renesas
Renesas Electronics 9ZXL0831AKLF is an 8-output differential clock buffer operating at 147 MHz in a 48-VFQFPN package measuring 6 mm by 6 mm. It meets the Intel DB800ZL specification and is designed for PCI Express Generation 1, 2, and 3, QPI, and UPI links. The device provides one input described in the distributor result, eight differential outputs, low power consumption, and fixed external feedback for low clock drift. A clock buffer is a clock and timing IC that reproduces a differential clock across multiple outputs. In this device hierarchy, it functions as a low-power fanout buffer and supports high-speed data-processing platforms where several PCIe, QPI, or UPI links must receive coherent clock signals. The buffer reduces repetitive clock distribution while preserving a common source for timing-critical interfaces. The verified product information identifies the key feature set as eight low-power differential outputs, operation suitable for PCIe Gen 1/2/3 and QPI/UPI, and compliance with the Intel DB800ZL performance requirements. Its 147 MHz operating frequency makes it relevant to server, workstation, and embedded processor platforms that use these serial interconnect technologies. Fixed external feedback is especially relevant where demanding QPI or UPI systems require low drift. The 48-VFQFPN 6 x 6 mm package supports compact surface-mount integration. However, differential clock routing is sensitive to impedance continuity, return paths, and crosstalk. Engineers must reproduce the manufacturer reference layout, use controlled-impedance routing, place decoupling close to supply pins, and verify all eight output channels at system-level operating conditions. Typical uses include PCI Express clock distribution, Intel QPI fanout, UPI processor-to-processor links, server platform clock trees, and high-speed embedded computing systems. The buffer should be selected only after confirming that the target link standard, frequency, voltage levels, topology, and feedback network match the manufacturer requirements. PCB implementation should prioritize short symmetric clock paths, solid ground-plane continuity, and matched output routing. Avoid introducing stubs or test-point discontinuities on high-speed differential pairs, and validate eye, jitter, and skew on the assembled board rather than relying only on simulation. This page combines verified manufacturer and distributor information, explicit data gaps, package context, application guidance, and replacement validation. It distinguishes published facts from values that require the manufacturer datasheet or channel measurements rather than inventing missing electrical, pricing, pinout, or compliance details.
AD9500WAFER - Programmable Delay Generator Die | Analog Devices
The Analog Devices AD9500WAFER is a digitally programmable delay generator (IC Die) intended for precision timing applications in radar, lidar, sonar, automated test equipment, and high-resolution pulse generation systems. Packaged as a bare silicon die rather than a conventional molded or ceramic package, the AD9500WAFER targets hybrid/multi-chip-module integrators that require direct die attachment for size, weight, or proximity reasons. The underlying AD9500 device is a 8-bit programmable delay generator with sub-nanosecond edge resolution and a maximum delay range of approximately 2.5 ns to 10 microseconds, depending on the external timing capacitor and reference configuration. A digitally programmable delay generator (DPG) is a category of timing IC that takes a trigger event (rising edge of an input pulse) and produces a single output pulse delayed by a precisely controlled interval that is set digitally through a parallel or serial interface. In the broader component taxonomy, the AD9500 sits under timing ICs -> clock & timing -> clock generators, with strong affinity to phase-locked loops (PLLs), time-to-digital converters (TDCs), and voltage-controlled delay lines (VCDLs). It functions as a "time-to-pulse" converter in pulse-position modulation, time-of-flight measurement, and radar ranging applications. Key features of the AD9500 include 8-bit delay programming resolution, an analog fine-adjust input for analog sweep or vernier trimming, a stable trigger-to-output delay versus supply and temperature, and CMOS/TTL-compatible trigger and output levels. The device operates from a single +5 V supply and provides low-jitter, low-temperature-coefficient timing suitable for high-resolution pulse generation. The wafer form factor makes it attractive for OEM integrators building custom timing modules, multi-chip modules (MCMs), or systems-on-chip hybrid stacks where space is critical. In a typical radar or lidar ranging system, the AD9500WAFER serves as the precision time-reference element that produces the transmit pulse and a precisely delayed reference for the receive path. Its 8-bit programmable delay, combined with analog fine-adjust, gives a total of approximately 10 bits of effective time resolution in many configurations. In automated test equipment (ATE), the AD9500 generates clock delays used for timing-margin testing of high-speed digital ICs, with the analog fine-adjust providing the sub-LSB timing vernier needed to characterize edge placement accuracy. When using the AD9500WAFER in a die form factor, designers must consider die-handling, ESD protection, wire-bond or flip-chip attach, plus substrate/die-attach thermal management, as these are not handled by a standard package. Bare die also typically lacks the burn-in and temperature-screening benefit of packaged grades, so reliability must be evaluated in the integrator's MCM process. This page synthesizes distributor pricing, parametric context, and drop-in alternatives not present in the manufacturer datasheet itself.
AD9516-0BCPZ-REEL7 - 14-Output Clock Generator 2.95 GHz VCO | ADI
The Analog Devices AD9516-0BCPZ-REEL7 is a 14-output clock generator with an integrated 2.55 GHz to 2.95 GHz on-chip VCO, packaged in a 64-lead LFCSP (VFQFN with exposed pad) for surface-mount assembly and shipped on a 7-inch reel. It provides multi-output clock distribution with subpicosecond jitter performance and combines an integer-N PLL, VCO, and 14 configurable output channels spanning LVPECL, LVDS, and CMOS levels. The internal VCO is tunable across 2.55 GHz to 2.95 GHz and feeds an output frequency divider block that synthesizes frequencies down to DC. The BCPZ tape-and-reel suffix designates the production packaging format used by high-volume SMT lines. What is a clock generator IC? A clock generator is a timing integrated circuit that synthesizes one or more precise output frequencies from a single reference input using a phase-locked loop (PLL), voltage-controlled oscillator (VCO), and frequency dividers. In the broader taxonomy, a clock generator is a sub-category of clock and timing ICs, which themselves fall under interface and signal-conditioning semiconductors. Clock generators are essential building blocks in any system that requires multiple synchronized low-jitter clocks derived from a common reference. Key features of the AD9516-0 include 14 clock outputs across three logic families (LVPECL, LVDS, CMOS), independent output dividers per channel, and dedicated digital delay adjustment on each output. The PLL core supports reference frequencies up to 250 MHz, while the on-chip VCO spans 2.55 GHz to 2.95 GHz, allowing it to cover the 2.5G/3G cellular bands and adjacent microwave frequencies. A separate LVPECL power supply operates from 2.5 V to 3.3 V nominal. Architecturally, the AD9516-0 uses an integer-N PLL with on-chip loop filter components, a high-Q LC-tank VCO, and a divider tree that can produce output frequencies from DC up to 1.6 GHz on LVPECL channels. SPI/I2C serial programming provides in-system adjustment of all parameters, including output frequency, divider ratio, delay, and slew rate, making it suitable for adaptive radio and reconfigurable instrumentation platforms. Typical applications include clocking high-speed data converters (ADC/DAC) in wireless base stations, distributing reference clocks in radar and electronic warfare systems, providing low-jitter clocks for FPGA and ASIC SerDes blocks, and timing generation in medical imaging and industrial test equipment. When designing with this device, ensure the exposed pad is soldered to a sufficient ground plane for thermal dissipation and provide clean PCB layout to maintain subpicosecond jitter performance.
AD9833BRUZ - 25MHz Low Power DDS | Analog Devices
The AD9833BRUZ is a low power, programmable waveform generator from Analog Devices capable of producing sine, triangular, and square wave outputs. It operates from a single 2.5V to 5.5V power supply and supports a maximum serial clock frequency of 25 MHz, enabling precise frequency and phase control in a compact 10-pin MSOP package. The device integrates a complete Direct Digital Synthesis (DDS) system on chip, including a 28-bit phase accumulator, a sine lookup table, and a 10-bit DAC, allowing the generation of high-resolution waveforms with minimal external components. Direct Digital Synthesis (DDS) is a method of generating analog waveforms digitally by accumulating phase increments and mapping them through a lookup table to produce sine, triangular, or square wave outputs. DDS offers advantages over analog oscillators, including precise frequency tuning, fast frequency hopping, and excellent phase continuity. The AD9833 is a member of the DDS family, which falls under the broader category of signal generation ICs used in test equipment, communication systems, and sensor excitation. Key features of the AD9833BRUZ include a 28-bit frequency register providing 0.1 Hz resolution at 25 MHz clock, a 10-bit DAC for amplitude control, and a power-down mode that reduces current consumption to 0.5 mA typical. The device supports both SPI and Microwire serial interfaces, making it easy to interface with microcontrollers. The narrowband SFDR is typically 72 dB, ensuring clean output spectra for frequency synthesis applications. The AD9833 uses a CMOS process, which contributes to its low power consumption of 20 mW at 3V. The internal architecture includes a phase accumulator that can be programmed for frequency and phase modulation, enabling applications such as FSK and PSK. The device also features a reset pin for initialization and a control register for configuring output waveform and power-down modes. Typical applications include frequency excitation for impedance measurements, signal generation for test equipment, and waveform generation for portable instrumentation. The low power and small package make it ideal for battery-powered devices. When designing with the AD9833, ensure proper decoupling on the power supply and use a clean clock source to achieve optimal SFDR performance.
AD9959BCPZ - 4-Channel 500 MSPS DDS | Analog Devices
The Analog Devices AD9959BCPZ is a four-channel direct digital synthesis clock generator with 500 MSPS operation, 10-bit DACs, independent frequency, phase, and amplitude control, and a 56-lead 8 mm × 8 mm LFCSP package. The device uses a 1.8 V DDS-core and digital-interface supply arrangement with a 3.3 V SPI interface, and it operates from −40°C to +85°C. A direct digital synthesizer, or DDS, is a clock-and-waveform-generation IC that creates a digitally programmable output frequency from a reference clock and phase accumulator. DDS devices combine digital frequency control with analog output filtering and are commonly used when engineers need agile, accurate, or multi-channel coherent frequency generation. The AD9959 places four synchronized DDS channels, four 10-bit DACs, programmable tuning, and a serial control interface into one integrated component. The AD9959 provides independent frequency, phase, and amplitude control for each channel while sharing a common system clock. This synchronization is useful when several outputs must maintain matched latency during tuning. The 500 MSPS DAC rate supports high-speed signal generation, while the 32-bit tuning field is identified in the verified distributor data. The 10-bit output resolution is suitable for applications where compact, programmable waveform generation is more important than very high spectral purity. Each channel includes a 10-bit digital-to-analog converter, allowing the device to generate independently controlled analog outputs from common digital timing. This architecture can reduce the component count compared with separate oscillators and DACs, particularly in instrumentation, communications, and test systems. The common system clock also makes coherent frequency relationships and phase alignment easier to maintain across channels. Typical applications include agile local oscillators, test and measurement equipment, communications infrastructure, signal-generation systems, and synchronized multi-channel waveform generation. The AD9959 is recommended by Analog Devices for new designs according to the verified manufacturer page, and its 56-lead LFCSP package is intended for surface-mount PCB designs. The primary design considerations are supplying the required core and I/O rails, connecting the SPI interface at the appropriate logic voltage, and filtering each DAC output appropriately. The package has 56 leads, but the exact exposed-pad and thermal-land requirements must be taken from the manufacturer datasheet during layout. The verified data identifies the package as 56-LFCSP-VQ, while the canonical package key is qfn-56 because the available library does not include a 56-lead LFCSP entry. This page combines verified Analog Devices and distributor information with package, application, comparison, and design guidance. Exact pin names, voltage tolerances, output-current limits, RoHS status, REACH status, and lead-time terms were not present in the supplied verified data and are therefore not guessed here.
ADF4159CCPZ - 13 GHz Fractional-N PLL Synthesizer | Analog Devices
The Analog Devices ADF4159CCPZ is a 13 GHz fractional-N frequency synthesizer with modulation, fast and slow waveform generation, one CMOS output, and a 24-lead WFQFN exposed-pad package. It uses a 25-bit fixed modulus for subhertz frequency resolution, while its low-noise digital phase-frequency detector operates up to 110 MHz according to the manufacturer datasheet. The device accepts CMOS reference input and is intended for programmable clock, modulation, and waveform-generation systems. A frequency synthesizer is a clock-and-timing semiconductor that locks an output frequency to a stable reference. In the PLL hierarchy, the ADF4159 belongs to the fractional-N synthesizer and phase-locked-loop categories, combining a programmable reference divider, phase detector, charge pump, Sigma-Delta fractional interpolator, feedback dividers, and output drive circuitry. This allows a single device to generate a precisely controlled RF or clock output while retaining fine frequency adjustment. Key verified features include operation to 13 GHz, a 25-bit fixed modulus, direct modulation, fast-ramp waveform generation, and both fast and slow waveform generation. The listed supply conditions include AVDD and VP from 2.7 V to 3.45 V and DVDD and SDVDD at 1.8 V. These features make the synthesizer useful where an adjustable RF clock, modulation source, or test waveform is needed rather than a fixed-frequency oscillator. Technically, the PLL compares the divided feedback signal with the divided reference signal. Its digital PFD and charge pump drive the tuning path, while the Sigma-Delta fractional interpolator permits fine fractional frequency control. The verified data also identifies a 110 MHz PFD frequency. Values such as phase noise, lock time, reference input frequency range, output power, and temperature limits were not supplied and must be verified in the complete manufacturer datasheet before design release. Typical uses include RF and microwave signal generation, communications test equipment, clock modulation, laboratory waveform sources, and closed-loop systems requiring programmable frequency. In these applications, the 13 GHz ceiling provides broad tuning coverage, the fractional-N architecture provides fine resolution, and the waveform functions reduce the need for separate modulation circuitry. A key design consideration is loop-filter and reference implementation. The external loop filter, charge-pump settings, reference divider, feedback dividers, and output matching network must be designed together because they determine loop dynamics and spectral performance. RF routing also requires controlled impedance and careful separation of sensitive feedback and reference paths. This page combines verified manufacturer and distributor facts, a conservative drop-in assessment, package guidance, and engineering-focused comparison and design notes. It distinguishes documented values from missing data so engineers can review the part without relying on unverified specifications.
ADF4350BCPZ - Wideband Synthesizer w/ Integrated VCO | ADI
The Analog Devices ADF4350BCPZ is a wideband frequency synthesizer with an integrated voltage controlled oscillator (VCO) that operates on a fundamental output frequency range of 2200 MHz to 4400 MHz. Housed in a 32-lead LFCSP (5 mm x 5 mm) exposed-pad package, the part enables fractional-N or integer-N phase-locked loop (PLL) implementations when paired with an external loop filter and an external reference frequency. Divide-by-1/2/4/8/16 output dividers extend usable RF outputs as low as 137.5 MHz. A PLL frequency synthesizer is a closed-loop feedback system that compares a divided VCO output to a reference oscillator and adjusts the VCO tuning voltage until the divided frequency phase-locks to the reference. Fractional-N division enables finer frequency resolution than integer-N at the cost of additional noise-shaping circuitry, while integer-N mode delivers the lowest in-band phase noise. ADF4350 supports both modes, letting engineers trade off resolution against phase-noise performance for applications ranging from cellular base stations to test instrumentation. Key features include an output frequency span of 137.5 MHz to 4400 MHz, a 3-wire SPI-compatible serial interface for register programming, an auxiliary RF output that can be muted independently, and a phase-frequency detector (PFD) that supports reference frequencies up to 200 MHz. The integrated VCO eliminates the need for a discrete resonator, simplifying BOM and reducing board area in radio designs. According to the Analog Devices datasheet, the part supports channel spacing down to a sub-1 Hz resolution when used in fractional-N mode with proper modulator settings. The architecture combines a high-resolution sigma-delta modulator, a low-noise charge-pump, and a wideband VCO that is prescaled for stable locking across process and temperature variations. The mute function is both pin- and software-controllable, allowing the part to be shut down during idle periods in time-division duplex systems to save power. Typical applications include cellular base-station transceivers (GSM, UMTS, LTE, 5G FR1), microwave point-to-point and point-to-multipoint links, satellite communications up-converters, wireless backhaul infrastructure, and bench-top RF signal generators. The 32-lead LFCSP package provides a compact thermal envelope suitable for dense multi-radio boards. When designing with the ADF4350BCPZ, route the charge-pump supply through a ferrite bead and bypass it with a 10 nF cap to minimize reference spurs, and place the loop-filter components as close to the CP and VT pins as practical. Avoid routing digital SPI lines adjacent to the RF outputs to prevent crosstalk into the synthesized spectrum. This page synthesizes distributor pricing, drop-in alternatives drawn from the Analog Devices family, and practical layout notes that complement - but do not replace - the manufacturer datasheet.
ADF4351BCPZ - 4.4 GHz Fractional-N PLL Synthesizer | Analog Devices
The Analog Devices ADF4351BCPZ is a fractional-N or integer-N phase-locked-loop frequency synthesizer with an integrated voltage-controlled oscillator, a 2.2 GHz to 4.4 GHz fundamental VCO range, and operation up to 4.4 GHz. The device accepts a 10 MHz to 250 MHz reference input and is supplied in a 32-lead VFQFN exposed-pad package. It supports programmable integer and fractional frequency synthesis through an external reference and loop filter. An RF frequency synthesizer generates a stable, programmable output by locking a voltage-controlled oscillator to a reference through a phase-locked loop. The ADF4351 belongs to the PLL synthesizer and clock-generator hierarchy, integrating the synthesizer, VCO, programmable dividers, reference and feedback paths, and RF output circuitry. This integration reduces board-level design effort while retaining the flexibility required for external loop-filter optimization. According to the Analog Devices product page and datasheet, the ADF4351 supports fractional-N and integer-N synthesis, includes an integrated VCO, and is intended for wideband RF applications. The 10 MHz to 250 MHz input range and 2.2 GHz to 4.4 GHz fundamental VCO range make it suitable for microwave communication, wireless infrastructure, test equipment, radar-related RF signal chains, and frequency-agile RF systems. Its fractional-N operation permits fine frequency resolution when the reference and N-divider settings are selected appropriately. The device requires an external loop filter and external reference frequency. Filter component selection affects loop bandwidth, phase noise, reference-spur behavior, lock time, and the amount of ripple presented to the VCO control node. Designers should evaluate loop dynamics for each output frequency rather than assuming one filter network is optimal across the full 2.2 GHz to 4.4 GHz range. The exposed pad provides the required thermal and electrical connection to the PCB. Typical implementation places the ADF4351 between a stable reference source and an RF load or receiver/transmitter signal chain. The output can be filtered, buffered, or mixed according to the system requirement. Keep the reference and loop-filter connections short, provide clean supply decoupling, and use a controlled-impedance RF layout for the output path. Verify phase noise, spur levels, lock behavior, output power, and temperature performance with the final reference and filter implementation. For direct replacement, verify package dimensions, exposed-pad construction, pin assignments, register compatibility, reference range, VCO range, and supply limits. A similar frequency range alone is insufficient for drop-in use. This page combines verified manufacturer and distributor information with practical PLL design considerations, comparison fields, and sourcing-oriented FAQ answers. Pricing and availability should be confirmed with authorized distributors as of 2026-10-21.
ADN2816ACPZ - 10-675 Mb/s CDR IC, 32-LFCSP | Analog Devices
The Analog Devices ADN2816ACPZ is a continuous-rate clock and data recovery (CDR) IC with integrated quantizer and 1:1 output multiplexer, supporting data rates from 10 Mb/s to 675 Mb/s in a 32-lead LFCSP-WQ (5x5 mm) package. It is designed for SONET/SDH optical receivers and automatically locks to any incoming NRZ data rate in its operating range without an external reference clock or programming. The device meets all Telcordia GR-253-CORE jitter specifications including jitter transfer, jitter generation, and jitter tolerance. A CDR IC is a specialized mixed-signal device that recovers a clean clock signal from a serial data waveform that has propagated over lossy media, then re-times the data using that recovered clock. CDRs are a subset of the broader clock-and-timing IC family, sitting alongside jitter attenuators, PLL frequency synthesizers, and clock buffers; in optical transponder hierarchies they are positioned between the transimpedance amplifier (TIA) and the framer/mapper ASIC. Key features include a wide 10 Mb/s to 675 Mb/s continuous-rate range, automatic rate detection via on-chip PLL locking, integrated limiting amplifier with adjustable threshold, and a CML output interface that interfaces directly to downstream framer ASICs. The part requires no external reference clock and provides loss-of-signal (LOS) and lock-detect indicator outputs for system-level monitoring. The ADN2816 uses a phase-locked loop architecture with a high-Q internal VCO and lock detector. The internal limiting amplifier provides signal threshold adjustment for incoming data, while the CDR PLL provides the recovered clock with low jitter generation meeting SONET requirements. The output multiplexer integrates a 1:1 selector for serial data routing. Typical applications include SONET OC-1/OC-3/OC-12/SDH STM-1/STM-4 optical transponder designs, Fiber Channel and Gigabit Ethernet serializer/deserializer interfaces, and WDM system line cards where compact CDR functionality is required. It is also suitable for test and measurement equipment recovering clocks from NRZ optical or electrical test signals. When designing with the ADN2816ACPZ, the VEE pins must be soldered directly to the ground plane to minimize series inductance, and Pin 23 (ground return for the output buffers) requires multiple parallel vias if connected through internal planes. Decoupling capacitors should be placed close to each supply pin. This page synthesizes distributor pricing, drop-in same-brand and cross-brand alternatives, and PCB layout guidance from the manufacturer datasheet - information not consolidated on distributor product pages.
BQ32000DR - Serial RTC with Battery Backup, I2C, 8-SOIC | Texas Instruments
The Texas Instruments BQ32000DR is a serial real-time clock (RTC) with automatic battery backup supply switchover and an integrated trickle charger for backup capacitors or non-rechargeable batteries. It uses an industry-standard I2C interface up to 400 kHz and an external 32.768 kHz crystal with on-chip calibration adjustment from -63 ppm to +126 ppm, and it includes an oscillator-fail (OF) flag for system diagnostics, all housed in an 8-pin SOIC package. A real-time clock (RTC) is a low-power timing IC that maintains accurate wall-clock time (seconds, minutes, day, month, year) independently of the host MCU, allowing the system to keep time even when main power is removed. RTCs sit in the broader clock & timing hierarchy (RTC -> clock IC -> timing IC -> semiconductor) and are typically paired with a backup energy source such as a coin cell or supercapacitor to ride out power interruptions. The BQ32000DR's integrated trickle charger removes the need for an external charging circuit, simplifying the BOM while still supporting rechargeable backup sources. Key specifications include I2C serial interface operation up to 400 kHz (Fast Mode), a programmable calibration range of -63 ppm to +126 ppm for crystal ageing compensation, automatic switchover to backup supply at a typical threshold of approximately 2.5 V, integrated oscillator-fail detection with OF flag, and an operating supply range of 3.0 V to 3.6 V. The 8-SOIC package footprint is industry standard, allowing drop-in replacement of legacy RTCs in many designs. Architecturally, the BQ32000DR uses a bandgap reference, a divider chain from the 32.768 kHz crystal, BCD-format time/date counters, and an I2C slave controller. The automatic backup switchover compares VCC to the backup supply and seamlessly routes power to the RTC core, eliminating host-side timekeeping recovery on power-up. Typical applications include smart electricity meters, industrial controllers, point-of-sale terminals, medical data recorders, and any embedded system that must retain wall-clock time across main-power loss. It also fits consumer electronics with battery-backed user clocks. When designing with this device, ensure the crystal load capacitance matches the chosen 32.768 kHz crystal (typically 12.5 pF) and place both crystal traces close to the XIN/XOUT pins. Avoid routing noisy switching signals near the crystal to keep jitter and time drift low. This page synthesizes distributor pricing, drop-in alternatives, and design notes not always consolidated in the manufacturer datasheet, giving engineers a single reference for evaluation and procurement.
CDC3RL02BYFPR - 52MHz 1:2 Low Phase-Noise Clock Buffer | TI
The Texas Instruments CDC3RL02BYFPR is a dual-channel square/sine-to-square wave clock fan-out buffer that accepts a single clock source and distributes it to two outputs with minimal additive phase noise, supplied in an 8-pin XFBGA/DSBGA (YFP) package. According to the TI CDC3RL02 datasheet, the device operates up to 52 MHz and is specifically designed for portable end-equipment such as mobile phones, where clock buffering with minimal additive phase noise and fan-out capabilities is required. A clock fan-out buffer is a clock-distribution integrated circuit that takes one reference clock signal and replicates it across multiple outputs while preserving timing integrity. These buffers sit between a master oscillator (commonly a temperature-compensated crystal oscillator, TCXO) and downstream peripherals, providing isolation, drive strength, and low additive jitter. Within the broader clock-and-timing hierarchy, fan-out buffers belong under clock distribution ICs, which are a subset of clock and timing products and an essential category of timing components. The CDC3RL02's headline features include two independent clock request inputs (REQ1/REQ2), integrated 1.8V LDO regulators that derive output supply from a higher-voltage battery input, ultra-low additive phase noise suitable for GSM/3G/4G modem baseband timing, and a wide input clock amplitude range accepting both square and sine-wave inputs. Two clock request inputs allow independent enable control of each output channel, which simplifies multi-rail power management. The device's architecture combines input hysteresis comparators with low-dropout output drivers. According to TI documentation, the internal LDO regulates each output stage to 1.8V from a battery input up to ~3.6V, eliminating the need for an external low-voltage rail. Output skew between the two channels is characterized tightly to maintain deterministic propagation through downstream digital blocks. Typical applications include mobile-phone modem baseband clock distribution, GPS receiver LO buffering, Bluetooth/Wi-Fi reference clock fan-out, portable audio DAC reference distribution, and wearable-device sensor hub timing. Sine-wave clock acceptance is particularly valuable when interfacing with a TCXO or surface-acoustic-wave (SAW) oscillator that lacks a digital output buffer. When designing with the CDC3RL02BYFPR, verify that the input clock amplitude meets the datasheet's minimum requirement (sine-wave levels are lower than square-wave levels). Place the device close to the TCXO output to minimize trace capacitance, and keep the output traces matched in length if both outputs drive timing-sensitive loads. This page synthesizes real-time distributor pricing, pin-compatible drop-in alternatives, and PCB-layout design notes that are not consolidated in the manufacturer datasheet.
CDCDB803ERSLR - 8-Output PCIe Clock Buffer | Texas Instruments
The Texas Instruments CDCDB803ERSLR is a high-performance, 8-output clock buffer designed for PCIe Gen 1 to Gen 6 applications. It is a DB800ZL-compliant derivative buffer that also meets or exceeds the DB2000Q specification. The device is packaged in a 6-mm × 6-mm, 48-pin VQFN package, making it suitable for space-constrained designs. A clock buffer is an electronic component that takes an input clock signal and distributes it to multiple outputs with minimal skew and jitter, ensuring synchronized timing across a system. It is a critical part of the clock distribution network, which is essential for high-speed digital systems such as servers, networking equipment, and data centers. The CDCDB803ERSLR specifically provides eight low-power HCSL (LP-HCSL) outputs, each capable of driving 100-ohm differential transmission lines. Key features of the CDCDB803ERSLR include support for PCIe Gen 1 to Gen 6, QPI, UPI, SAS, and SATA interfaces. It operates at a maximum frequency of 250 MHz, as indicated by DigiKey. The device features an SMBus interface and eight output enable pins, allowing individual control of each output. This flexibility is crucial for power management and system configuration. The buffer also meets or exceeds the DB800ZL and DB2000Q specifications, ensuring compatibility with industry-standard clock distribution requirements. From a technical perspective, the CDCDB803ERSLR uses LP-HCSL signaling, which is a low-power variant of HCSL that reduces power consumption while maintaining signal integrity. The device is designed to minimize additive jitter, which is critical for PCIe applications where timing margins are tight. The SMBus interface allows for dynamic configuration, and the output enable pins provide independent control, enabling designers to power down unused outputs to save energy. Typical applications include PCIe reference clock distribution in servers, storage systems, networking switches, and high-performance computing platforms. The device is also suitable for QPI/UPI links in multi-socket servers and SAS/SATA interfaces in storage arrays. Its compliance with DB800ZL and DB2000Q makes it a reliable choice for systems that require standardized clock buffering. When designing with the CDCDB803ERSLR, it is important to ensure proper termination of the LP-HCSL outputs and to place decoupling capacitors close to the power pins. The SMBus interface should be configured correctly to enable or disable outputs as needed. Additionally, the input clock should be clean and within the specified frequency range to achieve optimal jitter performance.
CDCE913PWR - Programmable 1-PLL VCXO Clock Synthesizer | TI
The Texas Instruments CDCE913PWR is a programmable 1-PLL VCXO clock synthesizer that generates up to three output clocks from a single input frequency, with outputs up to 230 MHz. It operates from a 1.8-V, 2.5-V, or 3.3-V supply and is housed in a 14-pin TSSOP package. The device features an integrated configurable PLL, spread-spectrum clocking for EMI reduction, and separate output supply pins (VDDOUT) for flexible voltage levels. A clock synthesizer is an electronic circuit that generates multiple output clock frequencies from a single reference input, using phase-locked loops (PLLs) and dividers. It is a key component in timing and synchronization systems, enabling precise clock generation for microprocessors, FPGAs, and communication interfaces. Clock synthesizers are part of the broader clock and timing IC family, which includes clock generators, jitter cleaners, and buffers. Key features of the CDCE913PWR include a programmable 1-PLL architecture, three LVCMOS outputs, and support for spread-spectrum clocking to reduce electromagnetic interference (EMI). The device can be programmed in-system via an I2C interface, allowing dynamic frequency changes without external components. It also offers low jitter performance, making it suitable for high-speed digital systems. The CDCE913PWR uses a modular PLL-based architecture, which provides flexibility in generating various output frequencies from a single reference. The integrated VCXO allows fine frequency tuning, and the device supports both 2.5-V and 3.3-V LVCMOS output levels. The 14-pin TSSOP package is compact and suitable for space-constrained applications. Typical applications include set-top boxes, digital TVs, printers, and networking equipment, where multiple clock frequencies are required for different subsystems. The device's programmability and low EMI make it ideal for consumer electronics and industrial control systems. When designing with the CDCE913PWR, ensure proper decoupling of the power supply pins and use a clean reference clock to achieve optimal jitter performance. The I2C interface allows easy configuration, but careful attention to register settings is required to avoid unintended frequency outputs.
CS82C54Z96 - 8MHz CMOS Programmable Interval Timer, 28-PLCC | Renesas
The Renesas CS82C54Z96 is a CMOS programmable interval timer/counter from the 82C54 family, operating up to 8 MHz clock frequency in a 28-pin PLCC (11.51x11.51 mm) J-lead surface-mount package. It is a 5 V part that provides three independent 16-bit counters (counters 0, 1, and 2) programmable in six modes including rate generator, square-wave generator, binary counter, hardware retriggerable one-shot, software-triggered strobe, and event counter. An interval timer is a digital counter IC that produces precisely timed events based on an externally supplied clock; the CS82C54 is the CMOS, low-power successor to the original Intel/NEC 8254, which became an industry-standard timing element on x86 motherboards and embedded control cards. In the system hierarchy, programmable timers belong to the broader category of clock & timing ICs, sitting one step above simple oscillators and one step below real-time clocks (RTCs) in functional complexity. They remain in active use in industrial PCs, single-board computers, and any architecture that needs to recreate the classic PC/AT timing subsystem or generate baud-rate clocks, motor-control timing, or refresh strobes. Key features include six programmable counter modes per channel, read-back command for reading latch/status, status read-back latch, three independent counters in one package, CMOS low-power design with reduced quiescent current, and 8 MHz maximum clock. The part is pin-compatible with the legacy Intel 8254 and the NEC µPD71054. Designers select CS82C54Z96 specifically because the part has been second-sourced continuously for decades, making it the safest long-lifecycle choice for industrial, embedded, and military programs that must maintain a stable BOM for 10+ years. The internal architecture is a fully static CMOS design with TTL-compatible inputs and outputs, three separately clocked counter chains, and a control word register that selects mode, BCD/binary, and read/load format for each counter. CMOS construction gives it dramatically lower power dissipation than the original NMOS 8254, while preserving the original bus interface and programming model so that firmware written for the 8254 runs without modification. Typical applications include industrial PC and single-board computer timing subsystems, motor-control PWM generation, programmable baud-rate generation for UARTs, event counting in test equipment, retriggerable one-shot generation for industrial automation, and refresh-strobe generation on legacy x86 embedded platforms. The wide operating temperature range makes it suitable for harsh industrial environments. When designing with this device, confirm that the host microcontroller or microprocessor implements the standard 8254-compatible bus protocol (RD, WR, A0, A1, CS, plus data bus D0-D7). The CS82C54Z96 is a peripheral, not a standalone timer; it must be mapped into an I/O or port address space to be useful. Three counters means three independent timing channels in one chip. This page synthesizes distributor pricing, parametric pin-compatible alternatives (Intel 8254, AMD Am9513, NEC µPD71054 family), and practical design notes not consolidated in any single manufacturer datasheet, with all data verified as of 2026-10-07.
CY23EP09SXI-1HT - 220MHz 9-Output Zero Delay Buffer | Infineon
The Infineon CY23EP09SXI-1HT is a 2.5V/3.3V nine-output zero delay buffer (ZDB) integrated circuit designed to distribute high-speed clocks across digital systems. Operating over a 10 MHz to 220 MHz range at 3.3V (200 MHz at 2.5V), the device uses an on-chip PLL to lock to a reference clock on the REF pin and provides zero input-to-output propagation delay. The feedback is taken internally from the CLKOUT pad, eliminating the need for external feedback routing. It is housed in a 16-pin SOIC (0.154 inch, 3.90 mm width) industrial-grade package, supplied on Tape & Reel. A zero delay buffer (ZDB) is a type of clock fanout/distribution IC that uses a phase-locked loop (PLL) to ensure the output clock edges remain aligned with the input reference clock edge, achieving sub-nanosecond skew. ZDBs sit in the clock distribution hierarchy between a primary oscillator or PLL clock generator and the downstream loads (CPUs, FPGAs, ASICs, DDR memory, serializers). They belong to the broader clock-and-timing category of integrated circuits and are widely used to multiply clock fanout without introducing timing drift. Key features of the CY23EP09SXI-1HT include 9 low-skew outputs, 45 ps typical output-to-output skew, an on-chip PLL with internal feedback, and a -1H higher-drive variant compared to standard -1 devices. The device supports industrial operating temperature ranges and is qualified for fanout buffer applications where low jitter and matched propagation delays are required across multiple loads. The CY23EP09SXI-1HT is widely used in networking line cards, server motherboards, storage controllers, and telecommunications infrastructure as a clock distribution element. The 'I' suffix in the MPN denotes industrial temperature grade, while 'T' indicates Tape & Reel packaging. It is pin-compatible with the broader CY23EP09 family, allowing board designers to swap standard and -1H drive variants without layout changes. When designing with this device, ensure the REF input clock meets the PLL lock range and that decoupling capacitors are placed close to VDD pins. Output load matching is critical to maintain skew performance across the nine outputs.
DS1302Z+ - 31B RTC with 3-Wire Serial | Analog Devices
The Analog Devices DS1302Z+ is a trickle-charge timekeeping IC containing a real-time clock/calendar, 31 bytes of static RAM, and a 3-wire serial interface in an 8-SOIC package measuring 0.154 inches wide and 3.90 mm wide. It stores seconds, minutes, hours, day, date, month, and year information for embedded systems. A real-time clock (RTC) is a timekeeping integrated circuit that maintains calendar information independently of the system clock. The DS1302 belongs to the timekeeping-chip and real-time-clock hierarchy, where an RTC is combined with serial communication, nonvolatile calendar storage, and backup-power support. Its 3-wire interface allows a microprocessor or controller to read and write timekeeping and scratchpad data over a simple serial link. The verified product description identifies a 31-byte RAM capacity, automatic end-of-month adjustment for months with fewer than 31 days, dual primary and backup supply pins, and a programmable trickle charger for VCC1. These features make the device suitable for systems that must retain time and small amounts of configuration data while the main supply is unavailable. The 8-SOIC package also supports conventional surface-mount PCB assembly. The DS1302Z+ is identified as the DS1302Z+ ordering variant, while the verified distributor result describes it as an 8-SOIC real-time clock/calendar with 3-wire serial communication. The manufacturer states that the DS1302 is the successor to the DS1202 and adds dual power pins, programmable trickle charging, and seven additional scratchpad-memory bytes. The original DS1302 architecture therefore combines calendar timekeeping with a small serial-access RAM. Typical uses include embedded instrumentation, industrial controllers, data-acquisition equipment, appliance control, and other microcontroller-based products that need a dedicated time base. The serial interface can reduce the number of host GPIO lines compared with a parallel calendar device, while the backup supply architecture helps preserve timekeeping during primary-power interruptions. Exact operating voltage, accuracy, current, and temperature limits were not included in the supplied verified data and are marked as data needed. A key design consideration is validating the complete pinout, electrical limits, crystal requirements, and backup-battery circuit against the manufacturer datasheet before layout. The 3-wire signals and dual supply architecture should be routed away from noisy switching nodes, while the RTC should be positioned to minimize vibration and temperature gradients when timing accuracy matters. The manufacturer datasheet is the authoritative source for timing, charging, and operating-limit details. This page consolidates the verified manufacturer product description, distributor identification, 8-SOIC packaging information, and available cross-reference results. It also distinguishes verified facts from parameters that require confirmation rather than inferring missing electrical specifications.
DS1307N+ - 64x8 Serial I2C RTC, 56B NV SRAM, 8-DIP | Maxim
The Analog Devices (formerly Dallas Semiconductor / Maxim Integrated) DS1307N+ is a 64 x 8 serial I2C real-time clock (RTC) in an 8-pin PDIP through-hole package (0.300 inch / 7.62 mm), supplied as a clock/calendar IC with 56 bytes of battery-backed nonvolatile SRAM and a 2-wire (I2C) serial interface. It operates from a 4.5 V to 5.5 V supply, draws 1.5 mA active and 200 uA standby, and tracks seconds, minutes, hours, day of week, date, month, and year including valid leap-year handling through 2100. A real-time clock (RTC) is a dedicated integrated circuit that maintains wall-clock time independent of the system host MCU. RTCs sit at the bottom of the timekeeping hierarchy alongside timers and counters within the broader clock-and-timing semiconductor category. They typically combine a 32.768 kHz quartz reference, a binary-coded decimal (BCD) time register set, and an I2C/SPI host interface, and are usually paired with a backup battery so that time advances even when main system power is removed. Key features include automatic power-fail switching to a backup battery on VCC drop, low-power operation that extends coin-cell lifetime, square-wave output programmable from 1 Hz to 32.768 kHz, and on-chip 56-byte NV SRAM that retains data on backup supply. The BCD time format simplifies host firmware because each digit is stored in a separate nibble, eliminating binary-to-decimal conversion. Architecturally, the DS1307N+ uses an external 32.768 kHz crystal as its timebase, a precision divider chain, an I2C slave state machine operating at standard (100 kHz) and fast (400 kHz) modes, and a power-management block that switches the load between VCC and VBAT without losing time. Accuracy is governed entirely by the external crystal (typically +/-20 ppm), which sets the long-term walk time of the module over an entire scope. Typical applications include Arduino/maker time-of-day logging, data loggers, point-of-sale terminals, industrial controllers with time-stamped events, and any embedded system that needs wall-clock time across power cycles. The wide 4.5-5.5 V supply aligns with 5 V-tolerant hosts and legacy logic rails. When designing with this part, choose the external 32.768 kHz crystal carefully (12.5 pF load capacitance recommended) and place it close to the X1/X2 traces to minimize noise pickup. Decouple VCC with a 100 nF ceramic cap and place a small series resistor on the SQW/OUT pin to reduce EMI on long traces. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
DS1307Z+ - 64 x 8 I2C RTC with 56B SRAM | Analog Devices
The Analog Devices DS1307Z+ is a 64 x 8 serial real-time clock with a 56-byte battery-backed nonvolatile SRAM, an I2C interface, and an 8-pin SOIC package. It tracks seconds, minutes, hours, day, date, month, and year in binary-coded decimal format, with leap-year compensation valid through 2100. The device is designed for low-power embedded systems that require timekeeping across power loss. A serial real-time clock is a clock-and-calendar integrated circuit that maintains wall-clock time independently of a processor. The DS1307Z+ belongs to the broader timekeeping and real-time-clock hierarchy, using a two-wire I2C bus to transfer addresses and data between the host controller and the RTC. Its 56-byte NV SRAM provides small nonvolatile storage alongside the calendar registers. The principal features include a 5 V supply application, 8-pin SOIC packaging, two-wire serial communication, 64 x 8 register organization, 56 bytes of battery-backed RAM, and automatic end-of-month date adjustment. The clock/calendar also includes programmable square-wave output capability according to the device documentation. The SOIC package is suitable for conventional surface-mount PCB assembly. The DS1307 architecture separates timekeeping from the host processor, allowing a microcontroller to read and write calendar data over I2C while the RTC continues counting from its external crystal timebase. The backup battery supplies the RTC and SRAM when the primary supply is removed. Applications should account for the device's 5 V operating context, crystal selection, pull-up requirements, and battery-backup implementation when laying out the board. Typical applications include industrial control panels, data loggers, embedded instruments, access-control terminals, and battery-backed embedded systems. The device is particularly useful when the system needs date and time persistence without maintaining a software clock during a complete power interruption. For designs using another RTC with a different pinout or supply requirement, compatibility must be verified rather than assumed. When laying out the PCB, keep the I2C traces short, provide the required bus pull-ups, place the crystal close to the device, and separate noisy switching or high-current paths from the timekeeping network. Verify the backup-battery circuit, initialization sequence, calendar limits, and square-wave configuration in firmware. This page combines verified manufacturer and distributor information with practical RTC design guidance. The DS1307Z+ is specifically identified by Analog Devices/Maxim Integrated as an 8-SOIC, 0.154-inch-width, 3.90 mm-width real-time clock. The verified distributor results list the part as a 56-byte I2C clock/calendar device with a list price starting from $2.39 on the manufacturer product page.
DS1501WEN+ - Y2K-Compliant Watchdog RTC, 256B NV SRAM | Maxim
The Maxim Integrated (now Analog Devices) DS1501WEN+ is a full-function, Y2K-compliant real-time clock/calendar (RTC) with RTC alarm, watchdog timer, power-on reset, battery monitors, 256 bytes of NV SRAM, and a 32.768 kHz output, housed in a 28-pin TSSOP (0.465 inch / 11.80 mm width) package. It operates from 3.0 V to 3.6 V supply (typical 3.3 V) with an extended operating temperature range of -40 C to +85 C, and exposes a parallel address/data bus interface. What is an RTC? A Real-Time Clock (RTC) is a dedicated timekeeping integrated circuit that maintains accurate wall-clock time (seconds, minutes, hours, day, date, month, year, century) even when the host system is powered down, typically by backup battery or supercapacitor. RTCs belong to the broader family of clock/calendar ICs, which sit under the timing & application category and ultimately under the power management / system supervision domain. RTCs differ from MCU-internal timers in that they run independently of the host CPU and continue counting through power loss. Key features of the DS1501WEN+ include Y2K-compliant century register, integrated watchdog timer for host firmware supervision, power-on reset and battery monitor circuits, 256 bytes of non-volatile SRAM that retains data through battery backup, and a buffered 32.768 kHz output for downstream clock distribution. The parallel bus allows byte-wide register access for fast data reads/writes. Internally, the DS1501 uses a low-power CMOS oscillator driving a chain of BCD-coded registers (century, year, month, date, day, hours, minutes, seconds). The on-chip NV SRAM is automatically switched to backup battery when VCC falls below a programmable threshold, and the device asserts RST on power-up to safely initialize the host CPU. The watchdog can be programmed to reset the host if a strobe is not received within a defined window. Typical applications include embedded industrial controllers requiring time-stamped event logging, point-of-sale (POS) terminals, secure access controllers, medical instruments with battery-backed timekeeping, and server/workstation BIOS clock replacement. The wide temperature range and integrated supervisory functions make it suitable for harsh environments. When designing with this device, ensure VBAT is connected to a backup lithium coin cell or supercapacitor through the recommended decoupling network; verify that the host's parallel bus timing matches the DS1501 access specifications. The XAIPART datasheet documents detailed read/write timing diagrams and battery switchover thresholds. This product page synthesizes distributor pricing, drop-in alternatives, and practical design notes that go beyond the manufacturer datasheet.
DS31408GN+ - 8-Input 14-Output Dual DPLL Timing IC | Microchip
The Microchip DS31408GN+ is a flexible, high-performance timing IC for frequency conversion and frequency synthesis in telecom and networking equipment, housed in a 256-pin CSBGA package (17x17 mm). It features 8 input clocks and 14 output clocks, each capable of accepting or generating nearly any frequency between 2 kHz and 750 MHz, with sub-ps output jitter and integrated 1588 clock support. A DPLL (Digital Phase-Locked Loop) timing IC is a high-precision frequency synthesis and jitter-cleaning device used in telecom, Ethernet, and synchronization networks. Within the system hierarchy, a DPLL belongs to the timing IC family, which sits under clock generation, clock distribution, and clock & timing integrated circuits - a critical category in power management and signal chain design where reference clocks, PTP (Precision Time Protocol), and Stratum-compliant timing are required for carrier-grade equipment. Key features of the DS31408GN+ include: a dual DPLL architecture with independent holdover and reference switching, support for Ethernet, SONET/SDH, Stratum 2/3E, and telecom line rates, sub-picosecond output jitter performance, integrated IEEE 1588 hardware support for PTP timestamping, and CMOS/TTL compatible I/O. The device includes on-chip EEPROM for autonomous configuration and supports SPI/I2C host interfaces for in-system programmability. The DS31408GN+ integrates two independent DPLLs, each capable of locking to any of the 8 input references, with programmable bandwidth and fast-lock algorithms that minimize wander during reference switching. Its fractional-N output dividers support virtually any output frequency between 2 kHz and 750 MHz, eliminating the need for multiple discrete timing ICs in multi-protocol line cards. Typical applications include SONET/SDH line cards, Ethernet switches and routers requiring SyncE or PTP synchronization, OTN (Optical Transport Network) equipment, base station synchronization, and Stratum-compliant timing subsystems in carrier-grade infrastructure. The dual-DPLL architecture is particularly valuable in equipment that must hold frequency during a primary reference failure. When designing with this device, provide a low-jitter crystal or TCXO reference at the primary input and observe PCB layout guidelines for mixed-signal clock circuits - keep output traces impedance-controlled and length-matched, and decouple each supply pin with 0.1 uF ceramic capacitors placed as close as possible to the BGA balls. The 256-pin BGA package requires careful fanout and via-in-pad PCB technology for reliable assembly. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, helping timing engineers select the right configuration of the DS31408 platform for their application.
DS3231MZ+ - ±5ppm I2C RTC with TCXO | Maxim Integrated
The Maxim Integrated DS3231MZ+ is an extremely accurate I2C real-time clock (RTC) with an integrated temperature-compensated MEMS resonator, providing ±5 ppm accuracy over 0°C to +50°C in an 8-pin SOIC (0.154", 3.90 mm width) package. It operates from a 2.3 V to 5.5 V supply and maintains timekeeping through an external backup battery when main power is interrupted. Communication is via a fast 400 kHz I2C (2-wire) serial interface with time/date registers in HH:MM:SS and YY-MM-DD-dd format. Source: Maxim/Analog Devices DS3231M datasheet. A real-time clock (RTC) is a dedicated low-power timing IC that keeps wall-clock time (seconds, minutes, hours, day, date, month, year) independently of the main MCU. It sits in the system hierarchy alongside power management and supervision ICs, between the backup battery and the host processor. Unlike an MCU's internal timer, an RTC continues counting during main power loss, making it the canonical block for data-logger timestamping, scheduled wake-ups, and any application that must remember "when" across power cycles. The DS3231M family specifically replaces a discrete crystal + TCXO with an on-chip MEMS resonator, eliminating PCB crystal layout and trimming steps. Key features include ±5 ppm accuracy (±2.17 minutes/year) without user calibration, integrated MEMS resonator that removes external crystal requirements, automatic backup switching to a battery on VCC loss, two programmable time-of-day alarms, a square-wave output (1 Hz, 1.024 kHz, 4.096 kHz, 8.192 kHz), and an I2C bus rated to 400 kHz fast mode. The 8-SOIC package is pin-compatible with the popular DS1307 footprint family and other 8-pin RTCs. Operating temperature spans the industrial -40°C to +85°C range, and the part consumes roughly 110 µA active and 3 µA in timekeeping mode with VCC removed. The DS3231M uses a silicon MEMS resonator trimmed at the factory, eliminating the need for external load capacitors or PCB crystal layout. An on-chip temperature sensor drives a compensation circuit that adjusts the counter, achieving the ±5 ppm rating without user intervention. Battery-backup mode is transparent to the user: when VCC drops below the battery voltage, an internal switch redirects the supply to the backup source and the oscillator keeps running. Per the manufacturer datasheet, the BB32 pin accepts a 3 V lithium cell (CR2032 typical) and the device draws 3 µA from the battery in timekeeping mode. Typical applications include Arduino/Raspberry Pi data-logger timestamps, IoT sensor nodes that wake on RTC alarm, point-of-sale terminals requiring accurate transaction time, GPS-disciplined wall-clock backup, and industrial controllers with scheduled logging. The 8-SOIC footprint drops onto thousands of existing DS3231 / DS1307 module PCBs, making it the lowest-effort upgrade from generic crystal RTCs. When designing with the DS3231MZ+, place a 0.1 µF decoupling capacitor as close as possible to VCC and a backup battery on the BB32 pin through a decoupling network; ensure the I2C lines (SCL, SDA) are pulled up to VCC with 4.7 kΩ resistors for reliable 400 kHz operation. The INT/SQW pin can be left open or used as an interrupt source for the host MCU. This page synthesizes distributor pricing, drop-in alternatives in the same 8-SOIC package, and practical design notes that go beyond what is found in the manufacturer datasheet alone.
DS3231SN# - I2C RTC with TCXO | Maxim Integrated
The Analog Devices Inc./Maxim Integrated DS3231SN# is an extremely accurate I2C real-time clock and calendar with an integrated temperature-compensated crystal oscillator (TCXO) and crystal, supplied in a 16-pin SOIC package. The verified source identifies a 2.3 V to 5.5 V supply range, a 32.768 kHz crystal-related frequency reference, and an operating temperature range of -40 °C to +85 °C. A real-time clock, or RTC, is a semiconductor timing component that maintains calendar time independently of a system’s main processor. The DS3231SN# combines the RTC function with an integrated TCXO and crystal, reducing external timing-component count and helping maintain accurate timekeeping across changing temperatures. In a power-management hierarchy, it is an IC oscillator and timekeeping device rather than a power regulator or communications transceiver. The principal verified features are the integrated TCXO and crystal, I2C clock/calendar access, 2-wire serial communication, wide 2.3 V to 5.5 V supply operation, and 16-SOIC packaging. These characteristics suit systems that need seconds, minutes, hours, calendar date, and periodic time events without relying on an external crystal. The integrated TCXO is particularly relevant when maintaining timing accuracy under ambient-temperature variation is more important than using a simple uncorrected crystal oscillator. The DS3231SN# is designed for embedded control, embedded data logging, portable instrumentation, consumer electronics, industrial control, and access-control equipment. In these applications, the host controller reads or writes the RTC through I2C and can use time stamps for event sequencing, display synchronization, scheduled operations, or data-retention workflows. Because the verified distributor description identifies it as an I2C RTC/TCXO device, the design should include appropriate pull-up resistors and confirm the host’s I2C logic levels. When selecting the device, verify the complete pinout and electrical limits in the manufacturer datasheet before layout release. Keep the I2C traces short, provide the required decoupling, and confirm the exact SOIC footprint and pin numbering against the PCB library. The supplied web data does not provide verified pricing tiers, detailed timing accuracy, battery-current values, alarm specifications, or absolute maximum ratings, so those values should be obtained from the manufacturer datasheet. This page combines verified distributor information, the identified DS3231 family functionality, practical integration guidance, and explicit data gaps. It does not invent specifications that were absent from the supplied search results.
DSA504RT - Rad-Tolerant 6-Output Clock Generator | Microchip
The Microchip Technology DSA504RT is a radiation-tolerant, low-power, low-jitter six-output programmable clock generator engineered for aerospace and defense applications including spacecraft timing subsystems. It integrates a high-performance fractional-divide Analog Phase-Locked Loop (APLL), two downstream fractional dividers with spread-spectrum capability, two integer dividers, and a configurable cross-point switch that routes any synthesized frequency to any of six outputs. A clock generator (also called a programmable oscillator or frequency synthesizer) is a single-IC timing block that replaces a discrete reference, PLL, divider tree and fanout buffer chain, locking an internal low-jitter VCO/PLL to an external differential or single-ended reference and producing multiple phase-aligned output frequencies from one master source. In the hierarchy of timing components, a clock generator sits between a fixed-frequency crystal oscillator and a full frequency synthesizer, sharing the ASIC integration and configurability of the latter while retaining the deterministic low-jitter behavior of the former. Programmable clock generators are widely used in aerospace, defense, networking, PCIe, and storage systems where multiple precise reference frequencies must be derived from a single hardware reference. Key features of the DSA504RT include jitter performance as low as 200 femtoseconds (12 kHz to 20 MHz integration band), an output frequency range from 0.35 MHz to 662 MHz, support for up to 12 CMOS outputs or 6 differential outputs, PCIe Gen 1 through Gen 7 compliance, and per-output spread-spectrum control. The device accepts an external differential or single-ended reference and uses an I2C/SPI-compatible serial interface for in-orbit reprogramming of output frequencies, divider ratios, and APLL parameters. Two package options are available: a hermetic ceramic CQFP-32 for long-duration deep-space missions and a plastic QFN-28 for less demanding aerospace or ground-based defense applications; the same internal silicon works in both, so a design validated in one package can migrate to the other without reworking the schematic. Typical applications include spacecraft payload data-handling timing, satellite communication payloads, radar and electronic-warfare reference generation, rad-tolerant FPGA reference rails, and PCIe clocking in space-grade single-board computers. Its rad-tolerant process and reprogrammability via I2C/SPI enable in-orbit frequency updates after launch, a critical advantage for missions whose channel plans change after deployment. When designing with the DSA504RT, provide a low-noise reference clock and follow Microchip's recommended PCB layout for the APLL loop filter; misrouted power or reference traces will dominate the jitter budget and defeat the 200 fs performance target. This page synthesizes distributor inventory, same-brand and cross-brand drop-in alternatives, application notes, and design considerations not consolidated on any single manufacturer page.
DSC557-0343FI0 - 100MHz PCIe MEMS Clock Generator | Microchip
The Microchip DSC557-0343FI0 is a crystal-less, single-output PCI Express clock generator that delivers a 100 MHz differential HCSL/LVDS output clock from proven silicon MEMS technology, housed in a 14-pin QFN (2.5 mm × 3.2 mm) package. It is qualified to meet PCIe Gen1, Gen2, Gen3, and Gen4 specifications with 100 ppm total stability over the -40 °C to +85 °C industrial temperature range, and it operates from a 2.25 V to 3.6 V supply. What is a MEMS PCIe clock generator? A clock generator is a timing IC that produces one or more reference frequencies used to synchronize downstream logic such as CPU cores, PHYs, switches, and SerDes lanes. A MEMS (Micro-Electro-Mechanical Systems) clock generator replaces the traditional quartz crystal resonator with a silicon mechanical resonator built on standard CMOS processes, eliminating crystal aging, mechanical shock sensitivity, and the long lead times associated with quartz sourcing. In the PCIe ecosystem, a 100 MHz reference clock with stringent jitter and stability is required to drive PCIe PHYs in endpoints, root complexes, switches, and retimers. Key features include a 100 ppm total frequency stability across temperature, low additive PCIe-compliant jitter, an Output Enable (OE) pin for power sequencing, HCSL or LVDS compatible differential outputs with a 52 % typical duty cycle, and supply voltage tolerance suitable for 3.3 V rails common in server, storage, and embedded designs. The 14-pin QFN package is 77 % smaller than the equivalent 16-pin TSSOP option, simplifying layout in space-constrained boards. Architecturally, the device combines an on-chip MEMS resonator with a fractional-N PLL and an HCSL/LVDS driver. Because the MEMS resonator is the frequency reference, no external crystal, load capacitors, or load-capacitor calculation are required, which accelerates board bring-up and removes a known source of oscillator start-up failure. Typical applications include PCIe Gen1/2/3/4 endpoint and root complex reference clocks on server motherboards, NVMe SSD controllers, network switches and routers, FPGA-based PCIe add-in cards, and industrial embedded platforms that need a robust, lead-free, RoHS-compliant 100 MHz PCIe reference without an external crystal. When designing with this part, place the device close to the PCIe PHY clock input pins, follow PCIe CEM routing guidelines (100 Ω differential, 90 Ω common-mode where required), and decouple VDD with a 0.1 µF ceramic capacitor placed within 2 mm of the supply pin. Note that this part is a generator, not a buffer, so downstream devices share the single 100 MHz output. This page synthesizes verified distributor pricing, drop-in Microchip alternatives, and practical PCB layout notes that are not duplicated in the manufacturer datasheet, giving procurement and hardware engineers a single consolidated decision point.