Тактирование и синхронизация
Товары (160)
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.
HMC704LP4E - 8 GHz 19-Bit Fractional-N PLL | Analog Devices
The Analog Devices HMC704LP4E is an 8 GHz, 19-bit fractional-N phase-locked loop frequency synthesizer with one output, supplied in a 24-pin VFQFN exposed-pad package. It uses a silicon-germanium BiCMOS process and combines a low-noise digital phase detector, VCO, divider, reference divider, and precision controlled charge pump. According to the manufacturer product page, the HMC704 family is designed for very low phase noise and spurious content. The manufacturer datasheet states that reference spurious levels can typically be below -100 dBc when used with a well-designed board layout. A fractional-N PLL is a frequency synthesizer that uses a controllable divider ratio to synthesize a precise output frequency from a stable reference. In the signal-chain hierarchy, this PLL belongs to clock generation and timing, then to frequency synthesis, and finally to the broader semiconductor and RF signal-control categories. Its programmable synthesis capability is useful when a system needs a local clock, modulation capability, or flexible frequency relationship between a reference source and downstream circuitry. The HMC704LP4E combines an 8 GHz synthesizer identity with a 19-bit fractional-N control word. The verified distributor listing identifies it as an integer-N/fractional-N clock-generation IC with a 24-VFQFN exposed-pad package. Its ultra-low-spurious design target makes it relevant to RF, communications, test-and-measurement, and other systems where phase noise, reference spurs, or frequency flexibility affect signal integrity. The exact reference frequency, output-frequency range, divider limits, supply currents, temperature range, and package dimensions are not included in the supplied verified text and require confirmation from the complete manufacturer datasheet. The silicon-germanium BiCMOS implementation supports the device’s combined high-frequency and low-noise synthesizer architecture. The integrated phase detector, charge pump, VCO, and divider functions reduce the number of external frequency-generation blocks while preserving programmable loop behavior. External loop-filter components and a stable reference supply remain essential design considerations because they determine loop bandwidth, phase noise, reference-spur performance, and settling behavior. Typical applications include RF transceiver clock generation, communication equipment, frequency-conversion systems, instrumentation, and test equipment. In an RF system, the synthesizer can generate a relationship between the local reference and a required channel or conversion frequency. In instrumentation, programmable frequency generation provides flexibility when the exact output frequency is selected by the host or test sequence. The most important layout consideration is preserving the low-spurious performance claimed by the manufacturer. Keep the reference and sensitive synthesizer paths short, use a stable low-noise supply, provide suitable decoupling, and follow the manufacturer’s recommended reference and loop-filter implementation. The HMC860LP3E is identified in the verified datasheet snippet as a recommended low-noise, high-PSRR regulator for minimizing external spurious sources. This page combines the verified HMC704 identity, package, synthesizer description, lifecycle indication, reference-spurious claim, and source links with clearly marked engineering data gaps. It also distinguishes verified facts from parameters that must be checked in the full datasheet before a new PCB or production design is released.
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.
M41T82RM6F - Low-Power I2C RTC with 32.768 kHz | STMicroelectronics
The STMicroelectronics M41T82RM6F is a low-power serial I2C real-time clock and calendar with a built-in 32.768 kHz oscillator, a 7-bit register address format, and an 8-pin SOIC package measuring 3.90 mm wide. It operates from a 2.0 V to 5.5 V clock supply range and provides battery-backed timekeeping with an ultra-low battery supply current of 365 nA. The device is designed for systems that require accurate calendar time, programmable alarms, periodic events, and low standby power. A real-time clock is a specialized timekeeping integrated circuit that maintains seconds, minutes, hours, date, day, month, and year information even when the main system is unpowered. The RTC category sits within clock and timing semiconductors, where crystal-based oscillators, dividers, registers, and digital interfaces work together to provide a stable time reference. Unlike a software timer, an RTC can continue counting through power loss and can be read again when the host processor restarts. The M41T82RM6F combines an external-crystal-controlled oscillator architecture with low-power serial communication. Its programmable alarm and timer functions can wake a connected microcontroller or signal that a scheduled interval has elapsed. The I2C interface reduces wiring requirements in compact embedded systems, while the 2.0 V to 5.5 V operating range supports both low-voltage and conventional supply environments. The 365 nA battery supply current is especially relevant for battery-backed meters, industrial recorders, and portable instruments. The STMicroelectronics M41T82 family description identifies the SO8 version as using an external 32.768 kHz crystal. Accurate timekeeping therefore depends not only on the RTC electronics but also on crystal selection, load-capacitance matching, layout quality, and temperature behavior. The M41T82RM6F is suited to data loggers, access-control terminals, metering equipment, industrial controllers, and consumer products requiring persistent timestamps. Its low standby consumption helps reduce energy use when the main supply is absent. For a robust design, place the RTC and its crystal close together on the PCB, keep high-current switching paths away from the oscillator network, and provide the required bypass capacitance. Confirm the exact pin functions, register behavior, alarm polarity, and electrical limits against the manufacturer datasheet before layout release. The verified source data supports the component identity, package, interface, oscillator, supply range, and low-current claims; additional operating details remain subject to the full STMicroelectronics datasheet. This page combines verified manufacturer and distributor information with application guidance, comparison fields, and design notes. It is intended to help engineers identify whether the M41T82RM6F fits a low-power battery-backed timekeeping design while distinguishing verified facts from parameters requiring confirmation from the latest datasheet.
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.
MASC-38040 - 28.9 GBaud 4-Channel PAM-4 CDR | MACOM
MACOM MASC-38040 is a four-channel, reference-free clock and data recovery retimer operating from 25.78 GBaud to 28.9 GBaud in a 5.2 mm x 5.2 mm QFN-compatible package. Its headline specifications are four PAM-4 channels, 28.9 GBaud maximum signaling rate, and single 1.8 V supply operation. Each channel can be controlled through a two-wire I2C-compatible interface, while a bypass mode supports legacy or nonstandard data rates. A clock and data recovery retimer is an IC that recovers a usable clock from a high-speed serial stream, resynchronizes data, and can compensate for accumulated timing and jitter problems. In the optical and digital-communications hierarchy, the MASC-38040 belongs to retiming CDR and clock-and-data recovery devices used in PAM-4 links operating at tens of gigabauds. Key features include reference-free operation across 25.78 to 28.9 GBaud, four independently controllable channels, bypass support, and a single 1.8 V power rail. The two-wire I2C-compatible control path simplifies configuration of multiple lanes. These characteristics suit systems requiring one retiming device to manage several parallel high-speed links rather than using separate single-channel recovery circuits. Technically, the device is positioned for 56G-class PAM-4 receive paths, where source, package, connector, and trace losses can impair timing recovery. Reference-free CDR operation is useful when the transmitter does not provide a separate usable reference. Bypass mode adds deployment flexibility for legacy or nonstandard rates, although the verified source does not specify which rates and modes are supported. Typical uses include 400G and 800G optical receivers, coherent communication modules, high-speed optical DSP test systems, and parallel data links. Each lane can be configured through the common control interface, helping synchronize operating states across a multi-channel receiver. PCB design should preserve short high-speed differential routes, continuous reference planes, and symmetrical via transitions. The 1.8 V rail requires local high-frequency decoupling and adequate return paths. Engineers must consult the manufacturer documentation for exact pin assignments, electrical limits, channel-count interpretation, bypass behavior, and exposed-pad requirements. This page consolidates the verified manufacturer specifications and explicitly identifies missing technical, commercial, pinout, compliance, and replacement data rather than estimating it. It also distinguishes a true pin-compatible replacement from unrelated QFN clock-and-data recovery devices.
MATA-37144 - Selectable-Bandwidth TIA/CDR | MACOM | Optical
The MACOM Technology Solutions MATA-37144 is a four-channel 25G/28G clock and data recovery amplifier with an integrated high-sensitivity transimpedance amplifier, limiting amplifier, and programmable output driver. Its selectable TIA bandwidth supports legacy data rates, while programmable slice level, loss-of-signal threshold, output swing, and de-emphasis provide receiver-chain control. The supplied data does not state the package or its physical dimensions. A clock and data recovery amplifier, or CDR, reconstructs a usable digital data stream and recovered clock from a degraded high-speed optical signal. This MACOM device combines the photodiode-input TIA, decision circuitry, and output-driver functions in one optical receiver path. In the signal-chain hierarchy, it belongs to clock and timing components and interface electronics, rather than a general-purpose digital logic IC. The MATA-37144 is specifically identified as a four-channel 25G/28G CDR with an integrated TIA. Its high-sensitivity TIA includes selectable bandwidth for legacy-rate support. After amplification, the limiting amplifier provides a defined decision function, while programmable output swing and de-emphasis allow downstream circuitry to be matched to channel and board conditions. Programmable slice-level adjustment and LOS-threshold control support receiver calibration and loss-of-signal detection. The verified source also associates the MATA-37144 with an average photodiode-current monitor identified as RSSI. This measurement feature helps a system evaluate received optical power indirectly. Together, the TIA, slicer, LOS control, RSSI monitoring, and programmable driver create a configurable receiver chain rather than a fixed-gain amplifier. Exact gain, sensitivity, bandwidth selections, data rates, supply voltage, power consumption, and channel-to-channel coupling require datasheet verification. The most relevant applications are 25G/28G optical transceiver receivers, legacy-rate-compatible optical links, parallel four-channel architectures, receiver equalization and de-emphasis experiments, and loss-of-signal monitoring systems. For these uses, designers should evaluate channel budget, photodiode capacitance, target line rate, recovery range, output impedance, and PCB channel loss before committing to a receiver implementation. A key design consideration is that programmable bandwidth, slice level, LOS threshold, output swing, and de-emphasis do not replace optical-power budgeting or channel simulation. Set receiver controls through validated firmware, preserve receiver eye margin, and verify compliance with the exact variant datasheet. The available evidence does not identify whether MATA-37144 is a catalog, die, tape-and-reel, or other package configuration. This page separates verified manufacturer-level facts from unavailable parameters and records every missing electrical or package attribute rather than estimating it. It also explains why a same-footprint replacement cannot be recommended until the package and pinout are verified. For an equivalent device, compare data rate, channel count, optical input sensitivity, bandwidth modes, LOS behavior, RSSI implementation, electrical interfaces, supply requirements, and package-level pin compatibility.
MAX35103EHJ+ Reduced-Power ToF Converter | Analog Devices
The Analog Devices MAX35103EHJ+ is a reduced-power time-to-digital converter with an integrated analog front end, real-time clock, and flash memory, specified for a 2.3 V to 3.6 V supply in a 32-pin TQFP (5 mm × 5 mm) package. It targets ultrasonic heat, water, and gas meters and increases the maximum time-of-flight measurement frequency in event timing mode from 2 Hz on the MAX35101 to 16 Hz. A time-to-digital converter, or ToF converter, measures the elapsed time represented by an ultrasonic pulse by converting a timing event into a digital result. The MAX35103 integrates the pulse-generation, receive-signal conditioning, timing, clock, and nonvolatile-measurement functions required by a compact ultrasonic metering front end. This integration reduces external circuitry compared with a discrete timer and analog receive chain while preserving a path to low-cost, low-power meter designs. According to the manufacturer datasheet, the MAX35103 consumes about half the average power of the MAX35101. The supplied sources do not provide a numeric average-current value, oscillator accuracy, ToF resolution, measurement range, flash capacity, temperature range, or absolute timing accuracy, so those values require confirmation in the datasheet or device evaluation before design release. The listed operating supply range is 2.3 V to 3.6 V. The integrated real-time clock and flash support metering designs that need timekeeping and persistent measurement data alongside ultrasonic time-of-flight conversion. The 16 Hz maximum event-timing frequency is particularly relevant when the meter must update more frequently than the MAX35101. Firmware, calibration, echo detection, and time-of-digital compensation still determine achievable accuracy and must be evaluated with real transducers and meter mechanics. Typical uses include ultrasonic heat meters, water meters, and gas meters. An Analog Devices evaluation kit installs the MAX35103EHJ+ and includes a USB-to-SPI interface plus graphical software for exercising device functionality. The supplied distributor records list the MAX35103EHJ+ in a 32-TQFP package and identify it as a CMOS-input, CMOS-output time-to-digital converter IC. For PCB design, place decoupling and timing-critical paths according to the manufacturer layout guidance and keep the ultrasonic analog front end away from switching nodes and digital return-current paths. Validate transducer drive amplitude, receive gain, threshold timing, clock calibration, and flash endurance under the intended flow, temperature, and supply conditions. Do not infer production suitability from the general-purpose EV kit alone.
MC1648M - Voltage-Controlled Oscillator | Motorola
The Motorola MC1648M is a voltage-controlled oscillator designed for frequency synthesis, modulation, and signal-generation applications. According to the available Motorola MC1648 documentation, the device requires an external parallel tank circuit consisting of an inductor and capacitor; maximum performance is obtained with QL greater than or equal to 100 at the operating frequency. A varactor diode may be placed in the tank circuit to provide a voltage-variable input for voltage-controlled oscillator operation. A voltage-controlled oscillator, or VCO, generates an output signal whose frequency varies with an applied control voltage. The MC1648 belongs to the broader clock and timing IC family, where it provides a tunable oscillator rather than a fixed-frequency clock. Its external tank circuit allows the designer to select inductance and capacitance for the target operating range, while the control voltage provides fine frequency adjustment. This architecture is useful in FM transmitters, frequency synthesizers, clock-generation circuits, and frequency-discriminator systems. The main verified technical characteristics are its external parallel LC-tank requirement and the recommended tank quality factor of QL at least 100 for maximum performance. The device also supports voltage-variable operation when a varactor diode is incorporated into the tank circuit. The supplied search results identify MC1648M as a Motorola voltage-controlled oscillator and associate it with a DIP-style MC1648 package family, but the detailed electrical ratings, frequency limits, supply voltage, output characteristics, pin names, and package dimensions were not included in the verified dataset. For design implementation, the external tank components should be placed close to the oscillator pins and selected for the intended frequency range. Component tolerance, parasitic capacitance, and inductor Q can shift the operating frequency. The control-voltage range and permitted control-voltage slew rate should be verified in the manufacturer datasheet before relying on the part for precision frequency control. Typical uses include FM radio modulation, tone generation, frequency conversion, and tunable clock sources. The MC1648M is most appropriate when an external LC network and application-specific frequency calibration are acceptable. Modern designs may instead choose a higher-integration oscillator when smaller size, digital calibration, or a specified phase-noise performance is required. This page combines the verified Motorola MC1648 tank-circuit requirements, distributor availability information, pricing context, and practical selection guidance. The verified distributor listing shows MC1648M in stock at LCSC with a starting price of $1.0043. Pricing and inventory should be checked with the authorized supplier before purchase, especially because legacy semiconductor availability can vary by package, region, and production status.
MCP79410-I/MS - I2C RTC with EEPROM and Battery Backup | Microchip
The Microchip MCP79410-I/MS is an I2C-compatible real-time clock/calendar with 1 Kbit EEPROM, 64-byte SRAM, unique ID, and automatic battery switchover, supplied in an 8-MSOP package. It operates from 1.8 V to 5.5 V across -40°C to +85°C and uses a 32.768 kHz crystal for timekeeping. The device combines a calendar clock, configurable alarms, nonvolatile storage, and backup-power management in one compact component. A real-time clock, or RTC, is a low-power timing integrated circuit that maintains wall-clock time independently of the system processor. An RTCC extends the basic RTC function with calendar registers for seconds, minutes, hours, dates, months, and years. The MCP79410 belongs to the RTC, RTCC, clock/calendar, and timekeeping IC hierarchy and interfaces to a host through a two-wire I2C-compatible serial interface. The MCP79410 provides 1 Kbit of EEPROM for persistent configuration or event records and 64 bytes of SRAM for temporary data. Its battery-switchover circuit allows the clock and memory to remain operational from a backup source when the primary supply fails. A timestamp mechanism records the power-failure event, while digital timing compensation compensates for crystal error and improves timekeeping accuracy without relying only on fixed analog calibration. According to the manufacturer datasheet, the clock supports automatic month-length handling, leap-year correction, 24-hour or 12-hour formats, programmable alarms, and a configurable CLKOUT. The MCP79410 family also includes a power-sense function that supports automatic transition between the primary supply and backup battery. The -I/MS ordering suffix denotes the specified package and temperature treatment, while /MS identifies the MSOP package used by this MPN. Typical uses include industrial controllers, embedded instruments, data loggers, meters, medical equipment, communication modules, and consumer electronics requiring accurate time stamps. Compared with software timekeeping based on a microcontroller timer, the RTC maintains a dedicated time base across resets, sleep states, and main-power interruptions. Its I2C interface also allows firmware to read and write time and memory data efficiently. The most important design checks are the 32.768 kHz crystal network, I2C pull-up resistors, decoupling capacitors, backup-battery configuration, and VBATEN handling. Firmware must configure the relevant control registers and verify the device address before normal operation. Because clock accuracy depends on the crystal and its load network, PCB placement and grounding should follow the manufacturer's recommended layout guidance. This product page combines verified distributor information, manufacturer technical facts, application guidance, and design considerations. It is intended to help engineers evaluate the MCP79410-I/MS for compact, battery-backed real-time clock and calendar designs, including comparisons, procurement questions, firmware considerations, and practical integration advice.
MCP79510T-I/MS - SPI RTCC 1Kb EE 64B SRAM | Microchip
The Microchip Technology MCP79510T-I/MS is a 10-pin MSOP SPI Real-Time Clock/Calendar (RTCC) with 1 Kbit EEPROM and 64 bytes battery-backed SRAM, designed for low-power timekeeping in embedded systems. Operating from 1.8V to 3.6V across the industrial -40C to +85C range, it integrates a digital-trimmed 32.768 kHz oscillator and battery switchover circuitry for backup power. The MCP79510T-I/MS uses a standard 4-wire SPI serial interface and is offered in a 10-MSOP (3.00 mm) surface-mount package. A Real-Time Clock (RTC) is a dedicated integrated circuit that maintains accurate time and date information independently of the host processor, typically counting seconds, minutes, hours, days, months and years. RTCs sit beneath clock & timing ICs in the broader semiconductor hierarchy: RTC -> clock & timing -> timing IC -> power management/interface IC. Battery-backed RTCs retain time during main power loss, making them essential for any system that must log events with wall-clock timestamps across power cycles. Key features of the MCP79510T-I/MS include digital trimming for improved long-term accuracy, software-controlled block write-protect for the EEPROM, a power-fail timestamp that captures the moment of main power loss, and a 64-byte SRAM that retains user data during backup. The integrated battery switchover automatically routes power from an external backup cell when VCC drops below the threshold, eliminating external MOSFETs and comparator circuits. Its event-detection input and configurable alarm provide a flexible wake-up mechanism for low-duty-cycle battery applications. The MCP79510 family shares a common register map and SPI command set across the MCP79510, MCP79511, MCP79512 and MCP79520/21/22 variants, allowing firmware reuse. The MCP79510T-I/MS is the 1 Kbit EEPROM member with 64 B SRAM, while the MCP79511/12 double the EEPROM and SRAM, and the MCP79520/21/22 add a unique 64-bit EUI-48/EUI-64 MAC ID for network-connected designs. Designers should consult the Microchip MCP79510 product page and the family datasheet (DS22078D) for the precise register differences. Typical applications include industrial data loggers, smart meters, medical monitoring devices, point-of-sale terminals, security alarm panels, and IoT edge nodes. The wide operating voltage and integrated battery switchover make the part drop-in compatible with both regulated 3.3V rails and direct Li-ion battery stacks. For designs that need higher accuracy, the digital trimming register allows sub-ppm adjustment against a known reference such as a GPS-disciplined oscillator. When designing with the MCP79510T-I/MS, place a 1 uF to 10 uF decoupling capacitor close to VCC and route the 32.768 kHz crystal traces symmetrically to minimize load-capacitance mismatch. The backup battery input should be decoupled with a small ceramic cap to absorb inrush during switchover; do not exceed the absolute maximum VCC or BAT voltage or the on-chip battery switchover circuit will be damaged.
MCP79511-I/MS - SPI RTCC, 64B SRAM, 10-MSOP | Microchip
The Microchip Technology MCP79511-I/MS is a 3V SPI Battery-Backed Real-Time Clock/Calendar (RTCC) IC with 64-byte SRAM and pre-programmed EUI-48 MAC ID, housed in a 10-pin MSOP package. The device integrates a digital-trimmed timekeeper, automatic battery switchover, 64-byte battery-backed SRAM, and 2 Kbit EEPROM for non-volatile parameter storage. According to the Microchip product page, the MCP79511 SPI RTCC is highly integrated with memory and advanced features normally found in higher-priced devices. A Real-Time Clock (RTC) IC is a low-power timekeeping device that maintains accurate wall-clock time (seconds, minutes, hours, day, date, month, year) and calendar functions even when the main system is powered down. RTCs typically include a backup power input (battery or supercapacitor) to keep time during outages, and they communicate with a host microcontroller via serial interfaces such as I2C, SPI, or parallel buses. Within the broader hierarchy, an RTCC sits under Clock & Timing ICs -> Integrated Circuits, and shares architectural lineage with calendar/watchdog timers used in metering, data loggers, and secure element designs. Key features of the MCP79511-I/MS include digital trimming for high-accuracy timekeeping (typically ±5 ppm across the industrial temperature range), automatic power-switchover to a backup battery when VCC drops below threshold, two configurable interrupt outputs for alarms and watchdog functions, and a unique pre-programmed 48-bit MAC address (EUI-48) that simplifies networking product compliance. The SPI interface operates at up to 5 MHz for fast register access and supports 1-byte to 64-byte block writes to the SRAM and EEPROM. The integrated 2 Kbit EEPROM provides ample storage for application parameters, configuration data, or tamper logs. Architecturally, the MCP79511 uses a 32.768 kHz crystal oscillator input with an on-chip digital trimming DAC, allowing fine frequency adjustment to compensate for crystal tolerance and aging. The device's power-sense circuitry continuously monitors VCC and seamlessly switches to backup supply without losing time integrity, which is critical for metering, security, and IoT edge nodes. A separate backup-supply pin (VBAT) accepts 1.3V-3.6V, supporting lithium coin cells or supercapacitors. Typical applications include smart energy metering (AMI), data loggers with timestamping, industrial automation controllers requiring scheduling, security alarm panels, IoT edge nodes with secure timekeeping, and any embedded system needing persistent date/time during power cycles. The pre-programmed EUI-48 MAC ID simplifies Wi-Fi, Ethernet, or 6LoWPAN commissioning and avoids the need for external MAC address storage. When designing with the MCP79511-I/MS, place the 32.768 kHz crystal as close to the X1/X2 pins as possible and use load capacitors that match the crystal's specified load capacitance (typically 6-12.5 pF). Decouple VCC and VBAT with 100 nF ceramic capacitors to handle the automatic switchover transient and prevent register corruption. This page synthesizes Microchip datasheet specifications, distributor pricing as of 2026-10-09, verified drop-in alternatives, and practical design notes not typically assembled on a single manufacturer datasheet page.
MCP79511T-I/MS - 3V SPI RTC with EUI-48 | Microchip
The Microchip Technology MCP79511T-I/MS is a 3 V SPI real-time clock/calendar with 64-byte battery-backed SRAM, 1 Kbit EEPROM, and a pre-programmed EUI-48 MAC ID. Its 10-pin MSOP package supports battery switchover, digital trimming, an interrupt output, alarms, events, and a pre-programmed unique identifier. The device targets systems requiring accurate timekeeping, low-power backup, and secure network identity. What is a real-time clock/calendar? An RTC maintains time and calendar information independently of the system processor, typically from a crystal oscillator and backup supply. An SPI RTC combines that timekeeping function with a serial peripheral interface and nonvolatile storage. The MCP79511T-I/MS belongs to the RTC and clock/timing category, providing system time, retained data, and programmable events without relying entirely on a microcontroller. The MCP79511 family combines digital trimming compensation, a backup-power switchover circuit, and pre-programmed EUI-48 identification. Its integrated 64-byte battery-backed SRAM preserves frequently used configuration or counter data, while 1 Kbit EEPROM provides nonvolatile storage. The SPI interface allows the host to configure the device, read current time, program alarms and timers, and manage stored data over a compact serial connection. The MCP79511T-I/MS is designed for low-power embedded systems where accurate timekeeping and identity are important. Digital trimming supports calibration of the oscillator, while the battery switchover helps maintain operation when the primary supply is removed. The interrupt output can indicate alarms, timer events, or other programmed conditions, allowing the host processor to remain inactive until an event occurs. Typical applications include Ethernet-connected equipment requiring EUI-48 identification, industrial controllers, data-acquisition systems, network appliances, embedded instruments, and battery-backed telemetry products. The combination of RTC functionality, retained memory, EEPROM, and MAC identity can reduce the number of discrete components required in a design. Designers should verify the crystal, load capacitors, supply decoupling, and backup-battery interface against the manufacturer datasheet. Firmware must also account for the device address, register map, interrupt behavior, and any required calibration sequence. The available verified source data confirms the 3 V SPI RTCC function, 64-byte SRAM, 1 Kbit EEPROM, EUI-48 identity, and 10-MSOP package. This page consolidates manufacturer product information, distributor listings, interface details, and application guidance for engineers evaluating the MCP79511T-I/MS. Exact pricing, electrical limits, timing values, and pin assignments should be checked against the current Microchip datasheet before release to production.
MS32340 - Quad 25/28G CDR with Adaptive Equalization
The MS32340 is a four-channel 25.78 Gbps / 28.05 Gbps clock and data recovery (CDR) device with integrated adaptive equalization, supplied in a SIP package. Its primary verified functions are four-channel clock and data recovery, support for both 25.78 Gbps and 28.05 Gbps data rates, and adaptive equalization for channel-loss compensation. The available source identifies the device as the ms32340 (SIP) Quad 25/28G CDR with Integrated Equal, but it does not provide a manufacturer identity, official manufacturer datasheet URL, complete pinout, lifecycle status, pricing, or a detailed electrical specification table. A CDR is a signal-integrity semiconductor that recovers a usable clock from a serialized high-speed data stream and aligns data with that recovered timing reference. In the broader hierarchy, a CDR is a clock-and-timing IC, a high-speed interface component, and part of the semiconductor family used in optical and copper data links. Adaptive equalization compensates for frequency-dependent channel loss encountered when data travels through connectors, printed-circuit-board traces, cables, or other interconnect media. Integrating equalization with clock and data recovery can reduce the number of separate high-speed signal-chain blocks required. The verified MS32340 description identifies four channels and two principal rates: 25.78 Gbps and 28.05 Gbps. These rates are suitable for evaluating next-generation high-speed links, but the supplied data does not state the associated line rate standard, modulation format, reference-clock requirement, equalization reach, jitter performance, power consumption, or operating temperature. It also does not specify whether the device transmits data, receives data, or performs both directions. Those details must be obtained from the original manufacturer documentation before schematic capture or production release. The part is identified as a SIP device, but the available source does not state pin count, body dimensions, lead spacing, thermal resistance, mounting orientation, or supported package variant. Because no authoritative manufacturer datasheet was supplied, the pinout is left null rather than reconstructed from secondary listings. Similarly, the device’s RoHS, REACH, AEC-Q100, lead-free, and halogen-free status cannot be inferred from the product category. MS32340 should be treated as a specialized high-speed CDR rather than a general-purpose regulator or microcontroller. Its integrated adaptive equalization makes it a candidate for prototype evaluation in high-speed communications equipment, optical-module signal paths, backplane links, and test equipment. The key design risk is incomplete documentation: system integrators should verify all timing, reach, loss-tolerance, power, and interface specifications against the manufacturer’s approved datasheet and reference designs. This page preserves only the verified MS32340 facts and does not invent missing electrical or commercial values.