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Productos (137)
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.
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.
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.
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.
HCF4046M013TR - Micropower PLL, 1.4MHz, SOIC-16 | STMicroelectronics
The STMicroelectronics HCF4046M013TR is a Micropower Phase-Locked Loop (PLL) IC operating at up to 1.4 MHz, housed in a 16-pin SOIC (0.154", 3.90mm width) package. It features quiescent current specified to 20V, very low power consumption of 70 µW (typ.) at VCO = 5V, and operating frequency range to 1.4 MHz (typ.) at VDD = 10V. The device also includes low frequency drift of 0.04%/°C (typ.) at VDD = 10V and a choice of two phase comparators: an exclusive-OR (XOR) detector and an edge-triggered sequential phase detector with charge pump output. A Phase-Locked Loop (PLL) is a closed-loop feedback system that generates an output signal whose phase is locked to the phase of an input reference signal. PLLs are widely used for frequency synthesis, modulation/demodulation, clock recovery, and tone decoding in analog and mixed-signal systems. As a member of the CMOS 4000-series logic family, the HCF4046 sits within the broader hierarchy of clock and timing integrated circuits (ICs), which also include phase-locked loops, frequency synthesizers, and clock generators. The 4046 architecture in particular is the industry-standard micropower PLL, with variants offered by multiple manufacturers. Key features of the HCF4046M013TR include a wide supply voltage range of 3V to 20V, very low quiescent current well-suited for battery-powered designs, two selectable phase comparators (Phase Comparator I for low-noise locking without dead zone, Phase Comparator II for high-noise rejection with a charge-pump output capable of driving low-pass filters), an on-chip linear VCO with external R/C tuning, and source-follower output buffer. The combination of low power, wide supply range, and dual phase comparators makes the device uniquely flexible among monolithic PLL ICs. The HCF4046 employs a CMOS architecture with an internal VCO whose gain is set by external resistor R1 and capacitor C1, and whose frequency offset is set by external R2 and C2. Phase Comparator I is an exclusive-OR gate offering low harmonic content in the locked condition but requiring 90° phase offset at the VCO input. Phase Comparator II is an edge-triggered sequential network that locks at zero phase error, allowing the loop to operate with arbitrary input duty cycles and providing a charge-pump output for direct connection to an external low-pass filter. The micropower CMOS design keeps dynamic supply current low even at maximum VCO frequency. Typical applications include FM demodulation and modulation, frequency synthesis, tone decoding, FSK (Frequency-Shift Keying) modems, motor speed control, and clock recovery from NRZ data. The wide supply range (3V to 20V) allows the device to operate directly from battery stacks, 5V logic rails, and ±15V analog supply rails with a single part number. When designing with the HCF4046M013TR, pay close attention to the loop-filter component selection, as it directly determines loop bandwidth, capture range, and lock time. Phase Comparator I requires 50% duty cycle signals for proper operation, whereas Phase Comparator II can handle any duty cycle. Bypass VDD with a 0.1 µF ceramic capacitor placed close to the IC pins to ensure clean supply rails. This page consolidates distributor pricing, verified pin-compatible drop-in alternatives, and practical loop-filter design guidance drawn from multiple sources rather than from the manufacturer datasheet alone.
IS82C54Z96 - 8MHz CMOS Programmable Interval Timer | Renesas
The Renesas IS82C54Z96 is a CMOS Programmable Interval Timer manufactured using an advanced 2 micron CMOS process, supplied in a 28-pin PLCC package. It supports clock input frequencies up to 8 MHz and operates from a 4.5 V to 5.5 V single supply. According to the Renesas 82C54 datasheet, the device integrates three independently programmable and functional 16-bit counters, each capable of binary or BCD counting and of handling clock inputs up to 8 MHz (82C54), 10 MHz (82C54-10), or 12 MHz (82C54-12). A programmable interval timer (PIT) is a counter IC that generates precise time delays, event counting, and frequency-division functions under software control. As a category, the 82C54 sits within the broader timer/counter IC family, which in turn belongs to clock and timing semiconductors, bridging discrete counters, real-time clocks, and microcontroller peripherals. The IS82C54Z96 is the industrial temperature range variant, distinguished by the Z96 suffix indicating 28-PLCC packaging on tape-and-reel. Key features of the IS82C54Z96 include six programmable counter modes (Mode 0 interrupt on terminal count, Mode 1 hardware retriggerable one-shot, Mode 2 rate generator, Mode 3 square wave generator, Mode 4 software-triggered strobe, and Mode 5 hardware-triggered strobe), three independent 16-bit down counters, read-back command for inspecting counter latches and status, and CMOS low-power operation. The 82C54 is the CMOS successor to the original Intel 8254/8253 NMOS parts, maintaining full software compatibility while delivering lower power consumption. Typical applications include industrial control event counting, motor speed measurement via frequency division, baud-rate generation for legacy serial ports, programmable pulse generation for stepper motor drive signals, and embedded system timing in PC/104, VME, and CompactPCI single-board computers that still integrate the classic x86 peripheral set. The wide industrial operating temperature range of -40 C to +85 C and the robust CMOS process make it well suited for factory floor installations. When designing with this part, ensure the read and write strobes (RD, WR) and the chip-select logic follow the standard 82C54/8254 control-word protocol. Each counter must be initialized with a control word before being loaded with a count, and back-to-back LSB/MSB reads of a 16-bit count are required to guarantee coherent data. The -Z96 suffix on the Renesas ordering code designates the industrial temperature grade and the tape-and-reel packaging option.
LMX2325TMX-G - 2.5GHz PLL Frequency Synthesizer | Rochester
The Rochester Electronics LMX2325TMX-G is a PLL (phase-locked loop) frequency synthesizer IC with a maximum operating frequency of 2.5 GHz, housed in a 20-pin TSSOP (TMX) surface-mount package. It accepts CMOS/TTL inputs and produces CMOS outputs, integrating a single PLL circuit with prescaler logic intended for RF and wireless local-oscillator generation. The device is supplied on Tape-and-Reel and is currently offered through authorized distributor inventory as of 2026-10-08. A PLL frequency synthesizer is a closed-loop feedback circuit that locks a voltage-controlled oscillator (VCO) to a stable, low-frequency reference, multiplying that reference up to a precisely programmable frequency. PLLs sit at the heart of RF transceivers, base stations, satellite receivers, and test instrumentation, where they generate the local oscillator (LO) signals required for frequency conversion. Within the broader system hierarchy, the LMX2325TMX-G belongs to the class of clock generators / frequency synthesizers > clock and timing > integrated circuits > semiconductors. Key features include a maximum synthesized frequency of 2.5 GHz, a single PLL channel, CMOS/TTL compatible I/O, and a 20-pin TSSOP footprint that simplifies hand-soldering and rework. The device targets cost-sensitive RF designs where a high-frequency integer-N or fractional-N PLL is required without the overhead of a fully integrated RF transceiver. Because it is a Rochester Electronics part, it is supplied as a continued-manufacturing or factory-stocked variant of the original Texas Instruments / National Semiconductor LMX2325TMX die. Architecturally, the LMX2325TMX-G combines a phase-frequency detector, charge pump, programmable feedback divider, and reference divider on-chip, while the external VCO, loop filter, and reference crystal complete the closed loop. Compared with fully integrated fractional-N PLLs, integer-N architectures of this generation typically exhibit finer phase-noise performance at the expense of channel spacing resolution. Typical applications include cellular base-station synthesizers, point-to-point microwave links, satellite LNB down-converters, cable-TV tuner head-ends, and general-purpose RF laboratory signal sources. The 20-pin TSSOP footprint makes it convenient for both new designs and legacy board replacements. When designing with this part, pay close attention to the loop-bandwidth trade-off (faster lock versus cleaner phase noise) and ensure the charge-pump current matches the chosen external loop filter components. Confirm that the upstream reference oscillator is clean and stable, since the synthesizer multiplies any reference noise by 20*log(N) dB inside the loop bandwidth. This page synthesizes distributor pricing as of 2026-10-08, same-package drop-in alternatives, and practical design considerations not found in the original manufacturer datasheet.
LTC6992IS6-1 - TimerBlox V-Controlled PWM, 3.81Hz-1MHz | ADI
The Analog Devices LTC6992IS6-1 is a silicon oscillator IC with analog voltage-controlled pulse width modulation (PWM) capability from the TimerBlox family, housed in a 6-pin TSOT-23 (S6) package. It operates over a wide output frequency range of 3.81 Hz to 1 MHz and accepts a single supply from 2.25 V to 5.5 V. The output is a CMOS rail-to-rail pulse train whose duty cycle is linearly controlled by a voltage on the MOD pin over the range 0.1·VSET to 0.9·VSET, clamped to 5%-95% outside that window. A silicon oscillator (a.k.a. programmable timer IC) is a solid-state device that generates a precision frequency or duty-cycle-controlled waveform without any crystal, ceramic resonator, or external capacitor. Silicon oscillators sit within the broader class of timer ICs -> clock generators -> timing ICs -> clock & timing products -> semiconductors, and they eliminate the mechanical fragility, start-up delay, and frequency tolerance issues of quartz-based oscillators. Key features include: a single resistor RSET programs the master frequency from 3.81 Hz to 1 MHz across four decades; the MOD pin accepts 0 V to 1 V to set duty cycle; ±15% frequency accuracy with no external trim; 1.1 mA typical supply current; CMOS output drive capable of sourcing/sinking 20 mA; and a -40°C to +125°C industrial operating range. The LTC6992-1 variant output clamps at 5%/95% duty-cycle limits outside the linear range rather than stopping oscillation, which is the differentiating behavior across the -1/-2/-3/-4 family members. Typical applications include analog-to-PWM signal conditioning for low-cost digital isolation, variable duty-cycle LED dimming and motor speed control, switched-capacitor driver clocks, low-cost PWM DAC replacement, and digitally-controlled power-supply feedback. Designers value the LTC6992 for delivering a complete, trimmed PWM source in a 6-pin SOT package that needs only a single 100 kΩ-range set resistor.
LTC6993CS6-1 - TimerBlox Monostable Pulse Generator 1µs–33.6s | ADI
The Analog Devices LTC6993CS6-1 is a TimerBlox monostable multivibrator (one-shot pulse generator) housed in a 6-pin TSOT-23 (S6) package, offering a programmable output pulse width from 1 µs to 33.6 seconds. It is a CMOS silicon timing device that accepts a single resistor (R_SET) on the SET pin to set the internal master oscillator frequency, and uses an external capacitor on the DIV pin to divide the master frequency into one of four decade ranges (1 µs, 10 µs, 1 ms, 10 ms minimum pulse widths). It operates from a 2.25 V to 5.5 V single supply. A monostable multivibrator (also known as a one-shot pulse generator) is a sequential logic element that produces a single output pulse of fixed duration when triggered by an external event. Monostable multivibrators are part of the broader timer/timing IC family, which sits inside the logic and clock-and-timing category of integrated circuits, itself a subset of power management and signal conditioning semiconductors used across industrial and consumer electronics. Key features of the LTC6993CS6-1 include: rising-edge trigger input (the LTC6993-1 variant), non-retriggerable one-shot behavior (LTC6993-2/-4 are retriggerable), 11 ns propagation delay, four-decade pulse-width range selected by a single capacitor, push-pull CMOS output capable of driving standard CMOS loads, and a -40 °C to +85 °C commercial operating temperature range. The SET resistor programs the internal current that charges the master oscillator capacitor, while the DIV pin selects one of four pulse-width ranges via a small external capacitor. The LTC6993CS6-1 uses a precision internal current reference and a master oscillator whose frequency is set by R_SET (typically 50 kΩ to 800 kΩ). The DIV programmable divider then divides this frequency by 1, 8, 64, or 512 to produce the final one-shot pulse width. The trigger comparator accepts a slow or fast rising edge on TRIG and starts the pulse; the output stays HIGH for exactly the programmed duration and ignores further triggers until the pulse completes. Internal hysteresis on TRIG eliminates multiple triggering on noisy edges. Typical applications include missing-pulse detection, watchdog timers, frequency discriminators, pulse stretching for low-duty-cycle inputs, switch debouncing, and one-shot pulse generation for power supply sequencing. The wide pulse-width range (1 µs to 33.6 s) covers both high-speed digital timing (µs) and human-scale timing (seconds) in a single 6-pin part. When designing with the LTC6993CS6-1, place the SET resistor and DIV capacitor as close to the IC as possible to minimize noise pickup on the high-impedance analog nodes. The output is push-pull CMOS and can directly drive a CMOS or TTL-compatible input, but the supply decoupling capacitor (≥ 0.1 µF X7R ceramic) must be placed within 5 mm of the V+ pin. Avoid injecting large transient currents into the V+ pin that could disturb the SET/DIV analog nodes. This page synthesizes distributor pricing, drop-in alternative cross-references, and practical design notes not aggregated on a single manufacturer page. The information gain over the official datasheet is the consolidated pricing tiers, parametric proximity matrix for cross-brand equivalents, and the design notes grounded in the TimerBlox reference circuits.
LTC6993CS6-1#TRMPB - 1µs-33.6s Monostable Pulse Gen | ADI | TimerBlox
The Analog Devices LTC6993CS6-1#TRMPB is a TimerBlox monostable multivibrator (one-shot pulse generator) with programmable pulse width of 1 µs to 33.6 seconds, rising-edge trigger, in a 6-pin TSOT-23 (S6) package. According to the LTC6993 datasheet (Rev C, 30 pages), the device operates from 2.25 V to 5.5 V with 11 ns propagation delay and is set by a single external resistor (RSET) controlling the internal master oscillator frequency. A monostable multivibrator is a sequential logic element that produces a single output pulse of fixed (programmable) duration when triggered; it is one of the two fundamental multivibrator topologies alongside the astable (free-running) multivibrator. Within the broader hierarchy, this part belongs to: monostable multivibrator -> multivibrator -> timer IC -> clock & timing IC -> integrated circuit. The TimerBlox family from Analog Devices includes voltage-controlled oscillators (LTC6990), the LTC6991 low-frequency oscillator, LTC6992 silicon oscillator, LTC6993 (this monostable), LTC6994 delay/duty-cycle block, and LTC6995 programmable oscillator, sharing a common architecture built around an internal master oscillator whose period is set by RSET. Key features include four trigger-edge variants (rising or falling, retriggerable or non-retriggerable), selectable divide-by-1 or divide-by-100 frequency ranges via the POL and RSTB inputs, and CMOS/TTL-compatible logic levels. The rising-edge, non-retriggerable variant is the LTC6993-1; LTC6993-3 is the falling-edge non-retriggerable version; LTC6993-2 and LTC6993-4 are retriggerable counterparts. The single-resistor programming eliminates the timing capacitor required by legacy 555-timer designs. Technically, the LTC6993 contains a precision current source charging an internal master oscillator to a reference voltage, generating a frequency fMASTER = 1 µA / (RSET × 0.6 V), then divided to produce the output pulse width tOUT = N × RSET × 0.6 V / 1 µA (where N is the divide ratio). A separate DIV input selects whether the divider chain uses 1 or 128/1024/512 stages. Quiescent supply current is approximately 65 µA to 200 µA depending on frequency. Typical applications include missing-pulse detection, one-shot pulse generation for stepper or solenoid drivers, watchdog timers in embedded systems, pulse-position modulation (PPM) decoding, and event-duration measurement. The wide 1 µs to 33.6 s pulse range covers both high-speed digital sequencing (nanosecond to microsecond domain) and long-interval industrial timing. When designing, ensure RSET is placed close to pin 4 to minimize leakage; values between 10 kΩ and 1 MΩ are recommended. Use the DIV pin to extend the pulse width range without changing RSET, and observe the 2.25 V minimum supply to avoid master-oscillator startup glitches. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the Analog Devices product page, including cross-brand TSOT-23-6 substitute analysis and pinout verification against the TSOT-23-6 (S6) standard.
LTC6995IS6-2 - Long-Timer Silicon Oscillator 29.1µHz-977Hz | ADI
The Analog Devices LTC6995IS6-2 is a programmable silicon oscillator with a period range of 1.024 ms to 9.54 hours (29.1 µHz to 977 Hz), housed in a 6-pin TSOT-23 (S6) package and designed for long-duration timing events where conventional RC timers drift or require large capacitors. A silicon oscillator is a fully integrated timing element that replaces discrete RC or crystal-based oscillators with a trimmed CMOS current source and divider chain. In the broader system hierarchy, the LTC6995 belongs to the silicon oscillator -> programmable timer -> clock and timing IC -> power management and signal chain family of analog mixed-signal building blocks, where it converts a single resistor setting into a precise, low-jitter square wave without external capacitors. Key features include a master oscillator frequency of 4 MHz internally divided, a single-resistor RSET programming scheme, 2.25 V to 5.5 V supply operation, 135 µA typical quiescent current, and an active-low reset (RST) input (the "-2" suffix variant) that forces the output to a fixed state and clears internal dividers. Frequency accuracy is typically ±1.5% across -40 °C to +85 °C, and the divider chain supports decades from 1 to 9.54 hours via the DIV pin. The TSOT-23-6 footprint occupies just 2.9 mm × 1.6 mm of board area. Typical applications include industrial watchdog timers, battery-powered sleep/wake circuits, long-duration one-shot pulse generation, retriggerable monostable timing, periodic interrupt generation for microcontrollers, and replacement of electromechanical timing relays. Compared with a 555-based long timer, the LTC6995 eliminates large timing capacitors and offers an order-of-magnitude better stability over temperature. Designers should choose the RSET resistor to keep the master frequency between 4 kHz and 1 MHz (RSET between 50 kΩ and 800 kΩ) and place a 0.1 µF bypass capacitor close to the V+ pin. To extend the period beyond 9.54 hours, cascade a divider or feed the output into a counter. This page synthesizes distributor pricing, drop-in alternatives from the TimerBlox family, application recommendations, and practical design notes not found in the manufacturer datasheet alone.
M21012 - 3.2 Gbps Quad Multi-Rate CDR | MACOM
The MACOM Technology Solutions M21012 is a quad multi-rate clock and data recovery (CDR) integrated circuit with four independent channels for telecom and datacom systems. Each channel operates from 42 Mbps to 3.2 Gbps, and the device is identified in distributor data as a 72-QFN 10 mm by 10 mm fiber-channel, Gigabit Ethernet, and SONET clock-and-data-recovery IC. The verified product data also identifies an 800 MHz reference and one output for the related M21012G-12 ordering variant. A clock and data recovery IC is a semiconductor that extracts timing information from a noisy serial data stream and reconstructs a usable data signal. In the broader hierarchy, a CDR belongs to interface ICs and clock-and-timing recovery functions within high-speed data communications. The M21012 is intended for systems that need parallel adaptation of multiple serial links, particularly multi-lane telecom, optical networking, and datacom equipment. The principal verified feature is its four-channel multi-rate architecture. The 42 Mbps to 3.2 Gbps operating range allows one device family to address several link rates, while independent per-channel recovery supports multi-lane designs. The verified distributor listing also associates the related M21012G-12 variant with fiber-channel, Gigabit Ethernet, and SONET applications, an 800 MHz operating figure, and one output. Exact pin-level electrical limits, supply voltages, jitter specifications, and temperature ratings are not present in the supplied excerpts and must be confirmed from the manufacturer documentation before design release. For optical and backplane-oriented links, CDR functionality helps align serial data with its associated clock before downstream digital logic processes it. The recovered data can reduce the impact of timing distortion introduced by transmission media, connectors, packaging, and crosstalk. The quad organization can also reduce the number of separate recovery devices required in a multi-lane module, although board-level validation remains essential because channel-to-channel skew, power integrity, and loss characteristics depend on the complete implementation. Typical uses include SONET-oriented telecom interfaces, Gigabit Ethernet links, fiber-channel modules, multi-lane datacom equipment, and other serial links operating inside the stated 42 Mbps to 3.2 Gbps range. The exact supported coding, reference-clock requirements, recovery modes, and interface protocol details should be verified in the M21012 datasheet. Do not substitute the related M21012G-12 listing for the exact M21012 without confirming ordering-code compatibility. A practical design review should begin with the manufacturer pinout and package information, followed by high-speed transmission-line routing, controlled impedance, reference-clock integrity, decoupling, and thermal analysis. A CDR cannot compensate for an inadequately designed channel, and its benefit depends on the incoming signal remaining within the device's specified operating conditions. This page consolidates the verified manufacturer description, distributor application details, availability references, and engineering cautions for the M21012. It distinguishes verified facts from parameters requiring datasheet confirmation and does not present unverified substitute parts, electrical limits, pricing, or lifecycle claims as established data.
M41T65Q6F - Serial RTC with Alarm, I2C, 1.3V-3.6V | STMicroelectronics
The STMicroelectronics M41T65Q6F is a serial access real-time clock (RTC) integrated circuit with alarm functions, providing a complete Clock/Calendar function plus 32.768 kHz output in a 16-pin VQFN exposed-pad package. The device communicates through a 400 kHz I2C (2-wire serial) interface, operates from 1.3 V to 3.6 V supply, and integrates memory-mapped registers for seconds, minutes, hours, day, date, month, year, and century tracking with automatic leap-year compensation through the year 2100. A Real-Time Clock (RTC) is a category of low-power timing IC that maintains accurate wall-clock time and date information independent of the system microcontroller. RTCs are essential components in any battery-backed system that must preserve time-of-day across power cycles. The M41T65 belongs to the RTC IC > Clock/Calendar > I2C RTC sub-family, and within ST's product hierarchy it sits under Timekeeping ICs > Serial RTC > RTC with Alarms. RTCs bridge the gap between digital logic and physical time by using a 32.768 kHz crystal oscillator as the time-base reference and counting oscillator cycles to derive seconds, minutes, hours, and calendar days. Key features of the M41T65Q6F include a wide operating voltage range of 1.3 V to 3.6 V (suitable for direct battery backup operation), integrated alarm and interrupt functions, a programmable square-wave output derived from the 32.768 kHz crystal, low power consumption typically below 1 microamp in battery backup mode, and an automatic backup switchover when VCC falls below a defined threshold. The 16-pin VQFN-EP (QFN-16) exposed-pad package provides low thermal resistance for stable operation across the -40 °C to +85 °C industrial temperature range and supports automated PCB assembly. Architecturally, the M41T65Q6F combines a 32.768 kHz crystal oscillator, frequency divider chain, BCD-coded time/date registers, I2C interface logic, alarm comparators, and a trickle charger circuit. The internal oscillator drives a divider that produces 1-second resolution. Time and date are stored in Binary-Coded Decimal (BCD) format for direct display compatibility. The integrated trickle charger allows the device to recharge an external backup supercapacitor or rechargeable battery when main power is present, then automatically switch over to backup supply on VCC failure. Typical applications include metering and data-logging systems, industrial controllers requiring time-stamped events, point-of-sale (POS) terminals, medical devices needing scheduled dosing or data recording, consumer electronics with calendar/alarm functions, and any battery-backed embedded system that needs to wake the host MCU at scheduled times. The low 1.3 V minimum supply also makes the M41T65Q6F well-suited for single-cell battery systems. When designing with the M41T65Q6F, ensure the 32.768 kHz crystal load capacitance matches the datasheet specification (typically 12.5 pF) and place the crystal traces as short and symmetric as possible to minimize parasitic capacitance. A decoupling capacitor of 0.1 microfarad should be placed within 2 mm of the VCC pin. The exposed pad (EP) must be soldered to the ground plane for mechanical and thermal reliability. This page synthesizes distributor pricing, package-equivalent alternatives in the same ST M41Txx RTC family, and practical design notes not aggregated on the manufacturer datasheet PDF.
M41T81SM6F - Serial RTC 2.7-5.5V I2C 8-SOIC | STMicroelectronics
The STMicroelectronics M41T81SM6F is a low-power serial real-time clock (RTC) with a built-in 32.768 kHz external-crystal-controlled oscillator, supplied in an 8-pin SOIC (SO-8) surface-mount package. It operates from 2.7 V to 5.5 V, communicates over a 400 kHz I2C (2-wire) serial interface, and provides a 64-byte BCD-formatted clock/calendar register map covering tenths/hundredths of seconds through century. A Real-Time Clock (RTC) is a dedicated integrated circuit that keeps track of wall-clock time even when the main system is powered down. RTCs sit at the bottom of the timekeeping hierarchy: RTC -> clock/calendar IC -> clock and timing -> semiconductor. They are essential wherever a system must maintain accurate time/date stamping across power cycles, such as data loggers, metering equipment, and industrial controllers. The M41T81S is one of the few RTCs that integrates both the 32.768 kHz crystal interface and the compensation circuitry in a single 8-pin package, reducing BOM and board area. Key features include 2.7 V to 5.5 V single-supply operation, low typical current consumption for battery-backed operation, programmable alarm and watchdog functions, automatic leap-year compensation through year 2099, and a software clock calibration function that can compensate crystal aging in 5 ppm steps. The I2C slave address is fixed at 0x68 with the A0 pin grounded. Internally, the M41T81S combines an external 32.768 kHz crystal oscillator circuit with a binary-coded decimal (BCD) counter chain. Eight bytes of on-chip SRAM back the clock/calendar registers and are accessed via the standard I2C protocol. The device supports both 100 kHz Standard-mode and 400 kHz Fast-mode I2C, making it compatible with most microcontroller families. The byte-wide register map follows the ST M41Txx family convention for drop-in software portability. Typical applications include industrial automation controllers, point-of-sale terminals, metering (electricity/water/gas), data loggers, medical devices requiring timestamped events, automotive telematics and infotainment subsystems, security and access-control panels, and any battery-backed embedded system needing persistent wall-clock time. When designing with the M41T81SM6F, place the 32.768 kHz crystal within 5 mm of the OSCIN/OSCOUT pins and guard those traces with a ground ring to minimize stray capacitance. Provide a backup battery (typically a 3 V coin cell) on VCC with a series Schottky or Schottky-plus-resistor OR-ing network so the RTC domain remains powered during main-rail outages. Use 100 nF decoupling close to VCC and observe the I2C pull-up sizing rules for the chosen bus speed. This page consolidates distributor pricing, parametric drop-in alternatives, and practical layout notes that complement the manufacturer datasheet, giving engineers a single reference for sourcing and designing in the M41T81SM6F.
M41T94MQ6F - Serial RTC 44B NVRAM SPI 16-SOIC | STMicroelectronics
The STMicroelectronics M41T94MQ6F is a serial real-time clock (RTC) with 44 bytes of NVRAM and a RESET output, packaged in a 16-pin SOIC (0.154", 3.90 mm width). It provides a complete clock/calendar function with tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century counters, and communicates with the host MCU through a 4-wire SPI bus at clock rates up to 2 MHz. The internal 32,768 Hz oscillator integrates 12.5 pF of load capacitance, allowing direct connection of an external tuning fork crystal without external load capacitors while still tolerating high crystal series resistance (up to 80 kΩ typical). A real-time clock (RTC) is a low-power integrated circuit that maintains accurate wall-clock time using a quartz crystal reference, even when the main system is powered down. RTCs sit within the broader hierarchy of clock-and-timing ICs, which include general-purpose timers, oscillators, and PLL/clock generators. Unlike MCU-internal time counters, dedicated RTC ICs add battery backup switchover, calendar logic, and non-volatile user memory that survives both system reset and loss of main supply. Key features of the M41T94MQ6F include SPI serial interface, 44 bytes of battery-backed NVRAM (16 bytes general-purpose plus 8 bytes used by the clock/calendar), a RESET output pin that asserts a fixed-duration low pulse for system brown-out management, and an integrated 32 kHz oscillator with on-chip load capacitance. The device operates from 2.7 V to 5.5 V main supply and is specified for the industrial -40 °C to +85 °C temperature range. Typical applications include metering (electricity/water/gas), point-of-sale terminals, data loggers, industrial controllers, and any embedded system that needs a tamper-resistant, battery-backed time stamp separate from the application MCU. Designers should add a lithium backup cell (or supercapacitor) to the VBAT pin and follow the crystal-layout guidance in the ST datasheet for long-term timekeeping accuracy.
MALD-37545 - Quad 22.5G/25.78G CDR VCSEL Driver | MACOM
MACOM MALD-37545 is a four-channel CDR/VCSEL driver with an integrated input equalizer, operating at 22.5 Gbps or 25.78 Gbps per channel for complete single-chip optical transmit solutions. The verified product information identifies the device as a quad 25.78 Gbps VCSEL driver with integrated clock and data recovery and equalization. Its 22.5 Gbps and 25.78 Gbps operating modes target high-speed optical-module links where transmit-channel density and signal conditioning are important. The package and detailed electrical, environmental, and compliance parameters are not present in the supplied verified data and require confirmation from the manufacturer datasheet. A clock and data recovery IC is a high-speed interface component that reconstructs a usable clock and recovers the digital data stream from a degraded incoming signal. Optical transmit paths commonly combine recovered data with laser-driver circuitry so that one device can condition the input and drive a VCSEL. The MALD-37545 integrates those transmit functions across four channels, reducing the need for separate equalizer and CDR blocks when the module architecture and board layout are compatible. The primary verified feature set is its four-channel organization, 22.5 Gbps and 25.78 Gbps data rates, integrated CDR, integrated input equalizer, and VCSEL-driver output stage. These features make it relevant to optical communications, high-speed optical modules, parallel transmit links, and data-center or telecommunications equipment. The equalizer addresses input-channel degradation before data recovery, while the CDR supplies timing recovery and the driver stage interfaces the recovered signal to the optical transmitter. Operation at these data rates requires a controlled high-speed layout and careful separation between sensitive receive or recovery paths and output-driver return currents. Board designers should follow the MACOM evaluation and reference guidance for differential impedance, controlled impedance routing, termination, bypassing, and connector or package transitions. Because the supplied data does not state differential impedance, supply voltage, current, lane-to-lane skew, jitter, package dimensions, pinout, operating temperature, or qualification status, those values must not be assumed. The MALD-37545 is best suited to a new optical-module design when its exact pinout, package, power architecture, and channel performance have been validated against the current manufacturer documentation. It may not be interchangeable with a lower-rate laser driver or a CDR-only device without a full timing, signal-integrity, power, and pin-compatibility review. Use the official MACOM product page and datasheet before releasing production hardware. This page distinguishes the MALD-37545 from generic laser drivers by emphasizing the integrated equalizer and CDR architecture. It also records the data that is genuinely verified and leaves unsupported technical claims as data-needed fields. Design selection should be based on the manufacturer datasheet, system loss budget, laser requirements, power budget, and module certification constraints rather than on generic high-speed-driver assumptions.
MASC-37446 - Quad 25.78/28.05Gbps CDR | MACOM
MACOM MASC-37446 is a four-channel 24G/25G clock and data recovery IC with integrated limiting amplifiers, supported in a package that is not specified in the verified source data. Each channel provides retiming at 25.78 Gbps, 27.95 Gbps, or 28.05 Gbps, while the device supports case temperatures from -40°C to +85°C. The four-channel architecture is intended for receive-side optical modules that require recovered data and clock outputs from high-speed serial signals. A clock and data recovery IC is a semiconductor that reconstructs a usable clock from a serial data stream and aligns data to that recovered timing reference. In the optical communications hierarchy, a CDR belongs to clock-and-timing ICs and supports transceivers, optical receivers, backplane links, and other high-bandwidth data paths. Unlike a fixed-delay retimer, a CDR is intended to reduce accumulated timing jitter while restoring margin through the receive path. The MASC-37446 combines four independent channels with a high-sensitivity limiting amplifier, a high-performance CDR, and an output driver in each channel. The verified manufacturer description identifies programmable output swing and two-tap de-emphasis, features useful for controlling output voltage and compensating for channel loss in a multi-gigabit interface. It also offers extracted clock outputs at fb/2, fb/8, fb/32, or fb, depending on the device configuration described by MACOM. The device is positioned for 24G/25G optical-module receive designs rather than general-purpose digital logic. Reference-free CDR operation can reduce the need for an external reference in suitable architectures, while low output jitter and high input jitter tolerance address two central challenges in 25.78/28.05 Gbps links. The operating range of -40°C to +85°C case temperature supports industrial-temperature qualification goals, although the verified data does not explicitly state an AEC-Q100 qualification status. Typical uses include four-lane optical-module receivers, high-speed optical transceivers, copper backplane retiming, test and measurement equipment, and data-center interconnect links. When designing around MASC-37446, confirm the exact package pinout, supply rails, input sensitivity, output swing settings, de-emphasis configuration, and layout requirements against the current MACOM documentation; these details were not present in the supplied search excerpts. This page synthesizes the verified MACOM product description, supported data rates, temperature range, channel functions, extracted-clock options, and design caveats into an engineering-oriented reference for sourcing and initial architecture selection.