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BQ4847YMT RTC Module with CPU Supervisor | Texas Instruments
The Texas Instruments BQ4847YMT is a real-time clock module with a parallel clock/calendar interface, integrated 130 mAh battery, quartz crystal, CPU supervisor, watchdog timer, and battery-low warning features. Its 28-pin DIP module package measures 0.61 inches, or 15.49 mm, according to the distributor listing. The module counts seconds through years in BCD format and specifies clock accuracy of ±1 minute per month. A real-time clock, or RTC, is a clock-and-timing IC that maintains time independently of the system processor. It typically supplies calendar and alarm information, supports battery-backed operation during main-power loss, and allows embedded equipment to retain accurate timestamps after restart. The BQ4847YMT combines the RTC, clock source, backup battery, supervisor circuitry, and external-SRAM retention control in one module, reducing the number of separate timing and power components a board must accommodate. Key features include BCD time-of-day and calendar counting from seconds through years, an integrated battery and crystal, an on-chip battery-backup switchover circuit, nonvolatile control for an external SRAM, a 130 mAh battery capacity, and ±1 minute per month clock accuracy. The CPU-supervisor function helps system firmware distinguish normal operation from reset or power-failure events, while watchdog, interrupt, reset, and battery-low warning functions support reliable embedded-control behavior. The module uses a parallel interface rather than the serial bus found in many compact RTC packages. According to the verified distributor descriptions, it is packaged as a 28-DIP module and is categorized as a clock/calendar RTC IC. The integrated battery and crystal mean the associated crystal and primary backup-cell implementation details are contained within the module rather than requiring the same external arrangement as a conventional RTC IC. Typical uses include industrial controllers, data-acquisition equipment, embedded instruments, access-control systems, and legacy computer hardware requiring a parallel RTC interface. Designers should preserve the module's pinout and battery behavior, account for main-supply and backup-supply sequencing, and verify reset, watchdog, and SRAM-retention requirements against the application. The supplied verified data does not specify a full electrical limit table, operating-temperature range, or lead-time figures, so those details should be confirmed in the manufacturer documentation.
BQ4850YMA-85 - 512Kx8 NVSRAM RTC | Texas Instruments
The Texas Instruments BQ4850YMA-85 is a real-time clock module with 512Kx8 nonvolatile SRAM, a 4.5 V to 5.5 V supply range, parallel access, and a 32-DIP module package. The integrated subsystem combines timekeeping, battery-backed SRAM, a crystal, and power-fail control, making it suitable for systems that must retain time and configuration data across power interruptions. According to the supplied distributor data, it is packaged as a 0.610 inch, 15.49 mm 32-DIP module. A real-time clock module is a clock-and-timing IC that maintains calendar and time information independently of the host processor's main clock. This device provides RAM-like clock access, BCD time and calendar counting, and an interface intended to resemble an x8 SRAM. Its broader system position is timekeeping and data retention within embedded control, industrial instrumentation, and legacy computer equipment. The key verified characteristics are 512Kx8 NVSRAM organization, a 4.5 V to 5.5 V operating supply, a parallel interface, and integrated SRAM, RTC, crystal, power-fail control, and battery functions. The supplied search data also identifies unlimited write capability as a feature, although the detailed write-cycle limit, retention duration, and electrical timing values are not provided. The BQ4850YMA-85 uses BCD-formatted time information and a date format identified by the supplied search result as YY-MM-DD-dd, with time expressed as HH MM SS in 24-hour format. This organization can simplify firmware access, but the host software should still validate register maps, alarm behavior, and power-fail timing before production release. Typical uses include industrial controllers, data-acquisition equipment, embedded instruments, and legacy systems requiring a parallel RTC with nonvolatile data storage. The 32-DIP package favors through-hole assembly or socketed prototyping rather than compact surface-mount consumer products. Designers should verify the complete pinout and timing values from the manufacturer datasheet, preserve decoupling and battery backup behavior, and validate power-fail recovery before substitution. Because verified drop-in alternatives are scarce, functional alternatives must not be treated as pin-compatible without manufacturer confirmation. This page consolidates verified distributor information, sourcing links, application context, and design cautions that are not all available from a single manufacturer datasheet listing. It also distinguishes verified data from parameters that still require engineering confirmation.
BQ4850YMA-85N - 512Kx8 NVSRAM RTC | Texas Instruments
The Texas Instruments BQ4850YMA-85N is a parallel-interface real-time clock and calendar module with an integrated 512Kx8 nonvolatile static RAM, crystal, power-fail control, and battery support in a 32-DIP module package. It operates from a 4.5 V to 5.5 V supply and records time in 24-hour HH MM SS format with a YY-MM-DD-dd date format. The device is supplied in a tube for production assembly. A real-time clock is a specialized integrated circuit that maintains time independently of the host processor. The BQ4850YMA-85N belongs to the RTC and calendar hierarchy, while its integrated RAM adds persistent data storage in the same module. This combination places it within clock-and-timing and data-retention applications where the system requires both accurate calendar information and nonvolatile storage without using separate timekeeping and memory devices. Key verified features include an integrated SRAM, real-time clock, crystal, power-fail control circuit, and battery support. The 512Kx8 NVSRAM provides 524,288 bits of storage, while the parallel interface gives the host direct access to time and memory registers. Operation from 4.5 V to 5.5 V suits conventional 5 V equipment, and the 32-DIP module format supports insertion into a through-hole board layout. The tube packaging option is intended for orderly manufacturing handling and automated or manual production insertion. Technically, the module combines timekeeping logic with nonvolatile static memory in one 32-pin package. Its BCD-based clock and calendar representation follows the verified HH MM SS and YY-MM-DD-dd formats. The integrated crystal establishes the timing reference, while the power-fail control and battery circuitry help preserve RTC operation and stored data during supply interruptions. Exact retention duration, battery characteristics, oscillator accuracy, and electrical limits beyond the supplied 4.5 V to 5.5 V supply range were not provided and therefore must be confirmed from the manufacturer datasheet before design release. Typical uses include industrial data loggers, instrumentation, embedded control systems, financial terminals, and equipment requiring a nonvolatile configuration or audit record. In such systems, the host processor can read the calendar through the parallel bus and use the NVSRAM for operating counters, calibration data, event logs, or configuration retention. Consolidation can reduce component count, but the complete host-bus timing, address map, battery chemistry, and write-protection behavior must be verified before schematic capture. The primary design consideration is to preserve the exact module footprint and verify every signal before substitution. A functional clock-and-RAM device is not automatically a drop-in replacement: supply limits, address mapping, access timing, battery handling, module dimensions, and power-fail behavior must all match. The verified sources did not establish five pin-compatible alternatives, so this page does not present unverified equivalents as drop-in parts. This product page combines verified manufacturer-related listings, distributor availability information, cross-reference results, package details, and engineering-specific cautions. It distinguishes confirmed BQ4850YMA-85N characteristics from parameters that still require the original manufacturer datasheet, providing a more reliable basis for sourcing and engineering review than a raw distributor listing alone.
BQ4852YMC-85 RTC with 512Kx8 NVSRAM | Texas Instruments
The Texas Instruments BQ4852YMC-85 is a real-time clock and nonvolatile SRAM module combining 512 Kbit of battery-backed SRAM, a clock/calendar, crystal control, and power-fail management in a 36-pin DIP module. The verified product listing identifies it as a parallel clock/calendar RTC in a 0.610 inch, 15.49 mm package. It also describes the device as pin-compatible with industry-standard x8 SRAMs, making it useful where an embedded system needs both persistent data and timekeeping without adding a separate memory device. A real-time clock (RTC) is a clock-and-timing IC that maintains calendar and time information while the main system is unpowered. A nonvolatile SRAM (NVSRAM) retains stored data across power loss, combining the persistence of memory with the timing functions of an RTC. Together, these devices provide backup storage, event timestamps, configuration retention, and elapsed-time measurement in industrial-control, instrumentation, data-acquisition, and embedded systems. The verified data identifies 512 Kbit organized as 512 Kbyte by 8 bits, real-time clock operation from seconds through years, RAM-like clock access, unlimited writes, and integrated SRAM, crystal, power-fail control, and battery functions. The BQ4852YMC-85 also includes watchdog-timer functionality according to the Mouser product description. Its 36-DIP module format supports through-hole assembly rather than a compact surface-mount design, making it especially relevant to legacy and industrial equipment with DIP-compatible footprints. The parallel interface permits direct connection between the RTC/NVSRAM and a host bus without the serial addressing required by I2C devices. The SRAM-like access method can simplify firmware when memory-mapped access is preferred. The power-fail control and backup-battery function help preserve data and maintain timekeeping during supply interruptions, although exact capacitor, battery, retention, and endurance values require confirmation in the manufacturer datasheet. Typical uses include industrial data loggers, test equipment, programmable controllers, meters, embedded instruments, and systems that require persistent configuration records alongside real-time timestamps. The package is not SOA data: it is a clock-and-timing and memory IC, not a discrete power semiconductor. The 16-page datasheet result supplied by the verified sources should be consulted for the complete pinout, electrical limits, battery configuration, oscillator characteristics, and power-fail behavior before design release. For a new design, verify the exact package dimensions, pin names, voltage levels, bus timing, and backup-power architecture against the manufacturer datasheet. For a replacement, do not rely on generic RTC or SRAM substitutes: the target requires a 36-DIP module, parallel access, 512 Kbyte by 8 organization, and compatible power-fail behavior. This page combines verified distributor metadata, structured product facts, and explicit data gaps rather than estimating unavailable electrical values.
CD4046AK - CMOS Micropower PLL | Harris | Clock & Timing
Harris Corporation CD4046AK is a CMOS micropower phase-locked-loop IC integrating a phase comparator, a high-gain voltage-controlled oscillator, a three-state VCO output stage, and a Schmitt-trigger input stage. The verified source identifies the device as a clock generator, PLL, and frequency synthesizer, but does not provide a verified numerical supply range, frequency range, package dimensions, pinout, or temperature grade. A phase-locked loop is a feedback-control circuit that synchronizes an output oscillator to a reference signal. The comparator measures phase and frequency error, the voltage-controlled oscillator converts the resulting control voltage into a variable-frequency output, and the feedback path continually corrects phase error. The CD4046AK belongs to the CD4000 CMOS logic family and can therefore be positioned in the hierarchy of phase-locked-loop, clock-generation, frequency-synthesis, timing, and semiconductor categories. Its useful functions include phase comparison, voltage-controlled frequency generation, clock synthesis, and feedback-based frequency multiplication or division when the surrounding circuit supplies suitable reference and feedback paths. The integrated Schmitt-trigger input can support input conditioning where the comparator signal is slow or noisy. Because the device combines several PLL functions, it can reduce the component count of a basic frequency-synthesis or clock-recovery design. The CD4046AK is relevant to communication links, tone generators, modulation circuits, measurement equipment, motor and timing systems, and digital systems requiring a variable clock. In these applications, the external resistor and capacitor values determine the VCO behavior, while the loop filter and feedback arrangement determine stability, lock range, ripple, and phase accuracy. Those circuit-level values cannot be selected without the unverified supply voltage, target frequency, and loop requirements. The principal design caution is that the VCO and comparator must remain within the device's verified operating limits. Verify voltage, frequency, temperature, package, and pinout data against the manufacturer datasheet before release. The available search data supports the circuit function and distributor availability categories, but it does not expose enough technical detail to state exact electrical limits without risking incorrect design values. This page combines verified distributor listings, component classification, datasheet availability, and engineering selection guidance. Exact ratings, pin assignments, pricing, and package dimensions remain explicitly unverified where the supplied sources do not publish them, preventing unsupported claims from entering a production design.
CD4046BE - 2.4MHz Micropower CMOS PLL IC | Texas Instruments
The Texas Instruments CD4046BE is a 2.4 MHz CMOS micropower phase-locked-loop (PLL) IC packaged in a 16-pin dual in-line plastic package. It operates from 3 V to 18 V and integrates a low-power linear voltage-controlled oscillator (VCO), two phase comparators, a common signal-input amplifier, and a common comparator input. These headline values place it in the clock-and-timing and frequency-synthesis hierarchy while supporting low-power voltage-controlled frequency generation, phase comparison, and feedback-based synchronization. A phase-locked loop is a feedback-control system in which a voltage-controlled oscillator is adjusted until a generated signal matches the phase relationship of a reference input. Within the CD4046B family, the low-power linear VCO and alternative phase-comparator outputs allow different loop architectures to be selected. The CD4046BE therefore combines oscillator and detector functions that would otherwise require separate discrete blocks, reducing component count in clock multiplication, demodulation, frequency synthesis, tone generation, and signal-conditioning circuits. The verified source identifies the CD4046BE as a CMOS micropower PLL with a 2.4 MHz maximum operating frequency, a 3 V to 18 V supply range, and approximately 10 mA supply current in the comparison data. It is offered in a 16-DIP package with a 0.300-inch pin pitch and 7.62 mm lead spacing. The two internal phase comparators and shared input amplifier provide implementation flexibility, but loop stability still depends on correct external resistor, capacitor, filtering, and feedback selections. Architecturally, the chip separates signal generation from phase detection. The linear VCO responds to its control voltage, while the phase-comparator sections generate correction information for the feedback loop. Comparator I is suited to positive-edge locking, whereas Comparator II supports zero-degree or 180-degree phase comparison depending on its configuration. Designers must follow the manufacturer datasheet for exact comparator logic, output states, operating limits, and timing because those details were not fully present in the supplied source text. Typical uses include FM and FM-to-AM demodulation, frequency synthesis, tone decoding, frequency multiplication, scanning or sweep generation, and low-frequency clock generation. The part is particularly relevant when variable frequency or phase correction is required and a conventional fixed-frequency oscillator is insufficient. Its CMOS micropower architecture favors low-power signal-path and control applications, provided the external loop network is designed for the intended frequency and supply voltage. The most important design consideration is loop-component validation. Keep the VCO timing network and feedback-path components close to the device, use the datasheet's recommended topology, and verify acquisition range, lock range, ripple, and phase error on the intended prototype. Component tolerances and parasitic capacitance can materially affect behavior at higher frequencies. Because the verified material does not provide complete timing or pin-function tables, engineers should obtain the manufacturer datasheet before release to production. This page combines distributor availability, verified family-level specifications, sourcing information, replacement constraints, and practical PLL design guidance. It distinguishes confirmed data from missing parameters while preserving the key advantage of CD4046BE: an integrated CMOS PLL and VCO in a standard 16-pin DIP package.
CD4046BF - CMOS Micropower Phase-Locked Loop | Texas Instruments
The Texas Instruments CD4046BF is a CMOS micropower phase-locked-loop integrated circuit operating from 3 V to 18 V in a 16-lead CDIP package rated for -55 C to +125 C. It integrates a low-power linear voltage-controlled oscillator, two phase comparators, a common signal-input amplifier, and a common comparator input. The device is designed for frequency synthesis, modulation, demodulation, tone decoding, and frequency-related control systems. Its CMOS construction supports low-power operation, while the two comparator options allow selection between phase-comparator modes suited to different locking behavior. The 16-CDIP mechanical package provides through-hole mounting and is suitable for industrial, instrumentation, communications, and legacy control systems requiring a stable, qualified temperature range. The CD4046BF designation identifies the 16-lead ceramic dual-in-line package variant within the CD4046B family. A phase-locked loop is a feedback-control system in which an internal voltage-controlled oscillator is adjusted until its output frequency or phase agrees with a reference input. In the CD4046BF, the signal-input amplifier feeds the selected phase-comparator path, while the VCO provides the tunable output. The PLL can therefore compare an incoming reference against a divided or generated frequency and present an error voltage for loop filtering and frequency control. The loop filter is external, allowing designers to tune loop bandwidth, capture behavior, damping, and output jitter according to the application. The key features of the CD4046BF are its 3 V to 18 V supply range, micropower CMOS operation, integrated VCO, two phase comparators, and broad -55 C to +125 C temperature rating. The VCO is linear, making the output frequency controllable by an external voltage. The common input amplifier and comparator input simplify use with external frequency-divider and loop-filter networks. The CD4046BF is a useful building block when a system needs both frequency synthesis and flexible feedback-loop implementation rather than a fixed-frequency oscillator. The device uses analog control techniques around a CMOS digital-compatible integrated circuit. The VCO output frequency depends on its control voltage and external timing components, while the phase comparator converts phase or frequency differences into an error signal. Designers should account for comparator type, loop-filter transfer function, VCO gain, divider ratio, reference frequency, and component tolerances. In practical designs, a low-pass filter commonly connects the comparator output to the VCO control input, and a frequency divider may be inserted between the VCO output and comparator input when integer multiplication is required. Typical applications include FM and AM demodulation, tone decoding, frequency synthesis, frequency multiplication, frequency division, phase discrimination, motor-speed-related modulation, communications interfaces, and instrumentation. The 16-CDIP package is particularly useful where through-hole assembly, rugged mechanical construction, or a wide temperature range is preferred over a surface-mount footprint. Designers should confirm timing, output-drive, supply-current, and component-temperature requirements against the manufacturer datasheet before production release. The most important design consideration is selecting the correct comparator and calculating the loop filter around the intended reference frequency. A filter that is too aggressive can increase noise or slow acquisition, while an insufficiently filtered loop can jitter or oscillate. Keep the VCO timing components and sensitive comparator nodes away from noisy switching paths, use a stable low-noise control voltage, and check the maximum operating frequency for the selected external components. The CD4046BF is not a power semiconductor, so a safe operating area specification is not applicable.
CD4046BK - 2.4MHz PLL Clock Synthesizer | Harris
The Harris CD4046BK is a phase-locked-loop clock synthesizer and frequency multiplier IC operating up to 2.4 MHz, supplied in a 16-pin flat-pack package. The verified distributor listing identifies the device as a phase lock loop IC with one output stage and a 16-pin CFP package. Its key function is to compare an input reference signal with a feedback signal and generate a stable, phase-related output suitable for clock generation, frequency synthesis, modulation, and signal-processing systems. A phase-locked loop is a feedback-control system that locks the frequency and phase of an output oscillator to an external reference. The CD4046BK belongs to the clock and timing IC hierarchy, combining a phase comparator, voltage-controlled oscillator, and auxiliary output circuitry. This makes it useful when a circuit needs programmable or reference-synchronized timing rather than a free-running oscillator. The verified data specifically confirms a maximum operating frequency of 2.4 MHz and a 16-CFlatPack package. Other operating details, electrical limits, pin names, temperature grades, supply voltage, and current consumption were not supplied in the verified records and therefore must be confirmed from the manufacturer datasheet before design release. The listed Harris and Intersil source records also indicate historical manufacturer-source variation, so procurement should verify the exact manufacturer, package marking, and datasheet revision. Typical design uses include low-frequency clock generation, frequency multiplication, tone generation, frequency-to-voltage conversion, phase-locked modulation, and instrumentation where a feedback loop maintains a controlled output. The loop filter, reference oscillator, and feedback divider are external circuit elements, allowing the system designer to set loop bandwidth and dynamic behavior. Actual performance depends on component tolerances, loop filter design, supply voltage, and the complete application circuit. For new designs, use the exact package footprint and pinout from the relevant CD4046BK datasheet rather than assuming that all CD4046 variants are interchangeable. Confirm supply-voltage limits, VCO gain, phase-comparator characteristics, output drive, and timing guarantees before substituting any part. The verified records identify distributor availability and pricing sources but do not provide a complete standardized pricing ladder or authoritative lifecycle statement. This product data synthesizes the verified distributor descriptions, package information, pricing reference, and cross-reference-search results. It distinguishes documented facts from missing technical parameters and does not infer unverified electrical specifications, lifecycle status, or manufacturer qualification claims.
CD4536BE - 5 MHz CMOS Programmable Timer | Texas Instruments
The Texas Instruments CD4536BE is a CMOS programmable timer IC with a maximum frequency of 5 MHz, supplied in a 16-pin PDIP package. It combines timer, oscillator, and counter functions in one device, allowing a fixed resistor-capacitor network or external clock to control timing and frequency behavior. According to the distributor listing, its operating temperature range is -55°C to 125°C. A programmable timer is a type of clock and timing IC used to generate, delay, divide, or count time-related signals. In system terms, the CD4536BE belongs to the timer and oscillator category, then to clock and timing ICs, and finally to integrated digital logic. Its CMOS construction supports operation from low-power digital control systems while providing the timing functions normally assembled from discrete counters, gates, resistors, and capacitors. The principal verified features are the 5 MHz maximum timing frequency and the 16-pin PDIP package. The official Texas Instruments product page identifies the device as a CMOS programmable timer, while the part-detail result specifies the 16-pin PDIP configuration and temperature range. The CD4536BE is suitable for general-purpose timing, oscillator, event-counting, waveform-generation, and control applications where a programmable digital timing block is useful. The device can be used as a monostable or astable timing element depending on the external network and wiring. In a one-shot configuration, an external trigger initiates a defined output interval. In an astable configuration, the timer repeatedly switches states and produces a periodic waveform. Its counter capability can also support frequency division or event counting. Exact timing limits, output drive, supply voltage, quiescent current, and propagation-delay values were not included in the provided verified data and should be confirmed from the manufacturer datasheet before design release. For layout, keep the timing components and signal paths short because the 16-pin PDIP device is intended for through-hole construction. Follow the manufacturer pinout and application examples exactly. Because the verified data does not provide a complete pin assignment or all electrical limits, engineers should retrieve the official CD4536B datasheet and verify timing tolerance, reset behavior, supply requirements, and output logic levels for the intended system. This page combines the verified manufacturer identity, distributor package and frequency information, pricing status, and replacement analysis. It also distinguishes confirmed engineering facts from parameters that still require datasheet review, helping buyers evaluate the CD4536BE without relying on unverified assumptions.
CD4541BE - 100 kHz Programmable Timer | Texas Instruments
The Texas Instruments CD4541BE is a CMOS programmable timer and oscillator with a maximum oscillator frequency of 100 kHz, packaged in a 14-pin PDIP. It combines a 16-stage binary counter, an external RC-controlled oscillator, automatic power-on reset, and programmable output-control logic. According to the Texas Instruments datasheet, it is a high-voltage type rated for 20 V. A programmable timer is a timing IC that generates or measures intervals using digital counters and, often, an external resistor-capacitor network. In the broader electronics hierarchy, the CD4541BE belongs to CMOS logic, timer and oscillator circuits, and clock-and-timing semiconductors. Its internal oscillator establishes the time base, while the 16-stage counter divides that frequency to produce longer intervals or lower-frequency outputs. The MODE input, located at pin 10, provides selectable operating modes. With MODE at logic 1, the output is a continuous square wave whose frequency equals the oscillator frequency divided by 2N. With MODE at logic 0 following a master reset, the selected output changes according to the datasheet truth table. The device also supports reset control and allows the timer output stage to be selected by external logic. The CD4541BE is useful for periodic-event generation, delay circuits, clock dividers, and low-frequency waveform generation. Because the oscillator uses external resistors and a capacitor, the timing accuracy and frequency depend on the selected component tolerances and the stability of those external parts. Designers should avoid using the device where high-frequency precision beyond its specified 100 kHz capability is required. Typical uses include industrial control timing, relay and pulse generation, laboratory breadboard projects, low-frequency clock sources, and counter-based sequencing. A 14-pin PDIP package is convenient for prototyping and through-hole assembly, although it occupies more board area than a surface-mount timer package. For reliable timing, place the oscillator resistor and capacitor close to their associated pins, keep timing traces short, and provide adequate bypassing on the supply pins. Verify the selected MODE and reset levels in the manufacturer truth table before relying on a particular output waveform. This page consolidates the available manufacturer and distributor information, explicitly identifies missing electrical details, and avoids presenting unverified performance claims as product specifications.
CD4541BF - CMOS Programmable Timer, 20 V | Texas Instruments
The Texas Instruments CD4541BF is a CMOS programmable timer rated to 20 V, with a 16-stage binary counter, an external RC-controlled oscillator, automatic power-on reset, and programmable output-stage selection in a 14-pin CDIP package. It operates across the automotive temperature range of -55°C to +125°C and is intended for timing, counting, pulse generation, and delayed-output applications. A programmable timer is a clock-and-timing semiconductor that combines oscillator, counter, reset, and output-control functions. The CD4541B belongs to the CMOS timer and counter hierarchy, where an external resistor-capacitor network establishes the oscillator timing and the internal binary counter divides that frequency into selectable output periods. Its high-voltage 20 V rating provides additional supply-voltage headroom compared with lower-voltage CMOS logic families. The device contains a 16-stage binary counter and uses MODE input pin 10 to select output behavior. According to the manufacturer datasheet, MODE high produces a continuous square wave whose frequency is the oscillator frequency divided by 2N, while MODE low provides a selected one-shot output after MASTER RESET. Output-stage selection allows the circuit to use counter outputs associated with programmable timing intervals. The design is suitable where fixed hardware timing is preferable to a software-driven timer. The 14-CDIP package is intended for through-hole industrial, automotive, and control-system assemblies. Its operating-temperature rating of -55°C to +125°C makes it suitable for electrically harsh environments when the surrounding system, resistors, capacitors, and output loads also satisfy the required limits. Because oscillator accuracy depends on component tolerances and temperature behavior, the external RC network and load capacitance must be selected carefully. Typical uses include delayed relay actuation, pulse and square-wave generation, periodic actuator control, industrial counters, automotive timing blocks, and power-sequencing helpers. The counter provides deterministic division of a frequency source, while MODE and MASTER RESET allow the output interval to be selected or reset in hardware. Unlike a microcontroller-based timer, the CD4541BF continues timing without clocked software. When laying out the circuit, keep the oscillator resistor-capacitor network close to the oscillator pins and minimize parasitic capacitance around the timing node. Use the manufacturer datasheet for exact resistor and capacitor limits, pin functions, reset behavior, output-drive capability, and output-stage truth table. The key engineering trade-off is flexibility: hardware timing reduces processor overhead, but programming a new interval generally requires changing external components or the counter-output selection rather than software.
CD4541BM - 20V CMOS Programmable Timer | Texas Instruments
The Texas Instruments CD4541BM is a CMOS programmable timer with a 20 V rating, a 16-stage binary counter, and output control logic in a 14-pin SOIC package. According to the verified distributor listing, it is a programmable timer IC with a 100 kHz oscillator classification and a 14-SOIC package. The device supports externally selected resistor-capacitor timing components, automatic power-on reset, and selectable output modes. A programmable timer is a timing and clock-management integrated circuit that generates repeatable delays or oscillation signals from external timing components. The CD4541B family combines an oscillator, a 16-stage binary counter, and output logic, allowing designers to divide an oscillator frequency and select an output stage for delay or waveform generation. Its CMOS architecture places it within the broader category of clock and timing ICs. Key verified features include a high-voltage 20 V rating, 14-pin SOIC packaging, and a 100 kHz timer classification. The oscillator is controlled by two external resistors and a capacitor, while the counter increments on positive-edge clock transitions. The manufacturer datasheet also identifies selectable Q and Q-barrier outputs from counter stages and a MODE input for choosing continuous square-wave or one-shot-style behavior. The CD4541BM is useful for industrial control timing, pulse generation, delayed switching, periodic control, and basic clock division. Its external RC interface gives the designer direct control over timing values, while the automatic power-on reset feature helps establish a defined startup state. The 14-pin SOIC format is also convenient for conventional surface-mount PCB assembly. When designing around the CD4541BM, calculate the external resistor and capacitor values against the required output frequency and verify timing tolerances over the intended temperature range. Keep the MODE and MASTER RESET inputs driven to valid CMOS levels, and account for supply voltage and propagation-delay requirements when cascading multiple stages. The manufacturer datasheet is the authoritative source for exact electrical limits, timing equations, and pin behavior. This page combines verified manufacturer and distributor information, source-linked technical context, and practical selection guidance for engineers evaluating the CD4541BM in timer and oscillator designs.
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.
CS82C54 - 8 MHz Programmable Timer | 28-PLCC | Renesas
Renesas Electronics CS82C54 is a CMOS programmable interval timer with three independent 16-bit counters, six programmable operating modes, and clock inputs up to 8 MHz, packaged in a 28-pin PLCC measuring 11.51 mm by 11.51 mm. It is designed for precise event counting, interval timing, waveform generation, and legacy processor timing tasks. A programmable interval timer is a clock-and-timing semiconductor that divides or counts input-clock pulses and reports events through counter values, status signals, and programmable outputs. The CS82C54 belongs to the broader timer and counter IC hierarchy, where multiple channels provide independent timing or event-counting functions under a common control interface. The device provides three independently programmable 16-bit counters, binary or BCD counting, status readback, and compatibility with NMOS 8254 operation. Each counter can select among six operating modes, allowing engineers to implement simple event counting, rate division, square-wave generation, one-shot timing, and retriggerable or triggered monostable behavior. The verified 8 MHz version supports clock inputs up to 8 MHz. Its 28-pin PLCC package provides a legacy-compatible surface-mount footprint, while the parallel control and data interface supports connection to microprocessor address, data, read/write, chip-select, reset, and clock buses. Because this is a digital integrated circuit rather than a power semiconductor, a Safe Operating Area chart is not applicable. Typical uses include industrial controller timing, event-counting modules, embedded system peripherals, waveform generation, and service as a hardware timer for legacy 8254-compatible systems. Engineers should verify the complete datasheet pinout, supply limits, timing values, electrical characteristics, and package details before production use, because several of those values are not included in the supplied search record. This product page combines the verified 8 MHz and 28-PLCC identifiers with sourced cross-reference information and explicitly marks unavailable technical data. It is intended to help engineers locate the datasheet, assess procurement options, verify compatibility, and plan validation before substituting or implementing the timer.
CS82C54Z - 8MHz 3-Counter Programmable Timer | Renesas
Renesas Electronics CS82C54Z is a CMOS programmable interval timer with three independent 16-bit counters, an 8 MHz maximum clock-input frequency, and a 28-pin PLCC package. It operates from a single 5 V supply and provides six programmable timer modes for event counting, elapsed-time indication, programmable one-shot operation, and other timing functions. A programmable interval timer is a timing IC that divides an external clock into programmable counts and manages events through counter, trigger, and gate signals. The 82C54 belongs to the broader counter and timer IC family, where each channel can operate independently. This architecture makes it suitable for industrial control, embedded processor systems, event sequencing, periodic interruption generation, and legacy computer interfaces. The three counters provide 16-bit programmable count ranges, while the 8 MHz clock capability supports more than 65,536 timing events per second at the input limit. Device programming is performed through the CS, WR, A0, and A1 control interface, allowing a microprocessor or embedded controller to select modes and load count values. The CMOS bus interface supports integration with microprocessor-based control systems. The CS82C54 is built with an advanced 2 µm CMOS process according to the indexed device documentation. Its single 5 V supply simplifies system power design, while the three independently programmable counters reduce the need for separate timer peripherals. The manufacturer identifies the device as compatible with industry-standard Intel 80C86, 80C88, and 80C286 CMOS microprocessor configurations. Typical applications include elapsed-time measurement, event counting, periodic pulse generation, one-shot timing, industrial sequencers, embedded control systems, and legacy processor peripherals. In each case, the external clock source and counter programming determine the effective timing resolution. The maximum input frequency should not be exceeded, and unused counter inputs should be handled according to the manufacturer datasheet. Designers should account for clock jitter, counter rollover, read-latch timing, and signal contention when the timer is connected to a processor bus. Because the package is a surface-mount PLCC, assembly requires a compatible footprint and adequate process capability for leaded plastic LCC packages. The available operating-temperature information applies to the documented 82C54 variant rather than every possible package option. This product page consolidates verified distributor pricing, manufacturer timing capabilities, cross-reference candidates, and practical selection guidance. It also distinguishes documented electrical facts from package-specific information that remains to be confirmed from the official datasheet before a new PCB or qualification build is released.
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.
CS82C84A - 25MHz CMOS Clock Generator | Intersil
The Intersil Corporation CS82C84A is a CMOS clock generator, clock synchronizer, and fanout-distribution integrated circuit with a maximum operating frequency of 25 MHz, supplied in a 20-pin leaded chip carrier package. It combines oscillator and clock-driver functions for processor timing systems that require a stable clock reference and coordinated clock distribution to multiple loads. A clock generator is an integrated circuit that establishes or conditions a periodic timing reference for digital systems. Within the clock and timing IC hierarchy, the CS82C84A belongs to the clock generator and synchronizer class, combining clock generation with buffer or fanout capability. Its CMOS construction supports integration into systems built around microprocessors, bus controllers, and other digital logic requiring a common clock source. The verified product listing identifies the CS82C84A as a clock generator, clock synchronizer, and fanout-distribution IC operating to 25 MHz. The device is also described as a CMOS clock generator-driver. Additional datasheet information, including its exact input clock range, supply-voltage limits, operating temperature, output configuration, and propagation-delay figures, is not available in the supplied verified records and should therefore be confirmed from the manufacturer datasheet before design release. Its principal engineering role is to generate or distribute a timing reference while coordinating clock outputs for attached logic. The 20-pin LCC package provides a relatively high pin count for this legacy timing function, allowing power, reference, control, and multiple clock-related connections. Because the verified sources identify a 25 MHz maximum frequency, the device belongs to designs using legacy or moderate-speed clocking rather than current high-speed processor interfaces. Typical uses include microprocessor timing control, bus-interface synchronization, embedded processor support logic, and legacy industrial or control equipment in which a dedicated clock generator-driver simplifies clock distribution. For each application, designers should verify signal levels, oscillator configuration, pin termination, and timing margins against the original system documentation because those details are not exposed in the provided snippets. When replacing or integrating this device, preserve the original 20-LCC footprint and confirm pin-level compatibility against the authoritative datasheet. Do not substitute a functionally similar oscillator without checking input frequency, supply voltage, output waveform, synchronization behavior, and propagation delay. The available cross-reference evidence identifies pin-to-pin replacement candidates, but it does not provide enough detail to guarantee unqualified second-source coverage. This page consolidates the verified 25 MHz classification, package information, distributor availability, source links, replacement candidates, and design cautions into a procurement-oriented engineering reference. It separates confirmed parameters from unavailable details so engineers can make an initial sourcing decision without mistaking inferred or generic clock-generator characteristics for published CS82C84A specifications.
CS82C85 - 25MHz CMOS Clock Controller | Harris
The Harris CS82C85 is a 25 MHz CMOS static clock controller and generator in a 28-pin leaded chip carrier package. According to the verified distributor listing, it is categorized as a clock-generator IC with a 25 MHz operating frequency and one clock output. Its primary purpose is to control operating modes in static CMOS computer systems, including full-speed operation, slow mode, clock stop, and oscillator stop. A static clock controller is a specialized timing-control integrated circuit within the clock and timing hierarchy. It coordinates processor and bus timing signals rather than performing general data processing. The CS82C85 provides centralized generation and gating functions for systems built around static CMOS logic, reducing the need to distribute equivalent control circuitry across a motherboard. The verified source data identifies four principal operating-mode functions: full speed, slow operation, stop-clock operation, and stop-oscillator operation. This mode control is central to coordinating system activity, power reduction, and restart behavior. The 25 MHz frequency indicates the associated clock-generator specification, while the detailed frequency tolerance, output waveform, supply voltage, and timing limits remain unavailable in the supplied records. The CS82C85 is packaged as a 28-pin J-lead leaded chip carrier, designated 28-LCC in the DigiKey listing. Its legacy form factor is appropriate for industrial, embedded, and legacy computer-system maintenance rather than modern high-density surface-mount designs. The complete mechanical drawing and every pin function must be checked against the manufacturer datasheet before PCB or replacement work. Typical uses include legacy static CMOS computer platforms, embedded processor subsystems, industrial controllers, and equipment requiring coordinated halt, slow-speed, and restart timing. In these systems, the controller can govern whether timing signals continue normally, are reduced, or are stopped while maintaining controlled operating-state transitions. The main design consideration is verification rather than estimation. Engineers should confirm package pin compatibility, signal polarity, oscillator behavior, and timing requirements against the original system documentation. Because the supplied search results do not provide verified alternatives with the same footprint and pinout, any proposed replacement should be treated as unconfirmed until its manufacturer datasheet has been reviewed. This page consolidates the verified distributor identity, package, frequency, operating-mode description, sourcing links, and engineering cautions. It distinguishes documented facts from missing electrical data and avoids presenting unverified replacement or timing claims as established specifications.
CY23EP09SXI-1HT - 220MHz 9-Output Zero Delay Buffer | Infineon
The Infineon CY23EP09SXI-1HT is a 2.5V/3.3V nine-output zero delay buffer (ZDB) integrated circuit designed to distribute high-speed clocks across digital systems. Operating over a 10 MHz to 220 MHz range at 3.3V (200 MHz at 2.5V), the device uses an on-chip PLL to lock to a reference clock on the REF pin and provides zero input-to-output propagation delay. The feedback is taken internally from the CLKOUT pad, eliminating the need for external feedback routing. It is housed in a 16-pin SOIC (0.154 inch, 3.90 mm width) industrial-grade package, supplied on Tape & Reel. A zero delay buffer (ZDB) is a type of clock fanout/distribution IC that uses a phase-locked loop (PLL) to ensure the output clock edges remain aligned with the input reference clock edge, achieving sub-nanosecond skew. ZDBs sit in the clock distribution hierarchy between a primary oscillator or PLL clock generator and the downstream loads (CPUs, FPGAs, ASICs, DDR memory, serializers). They belong to the broader clock-and-timing category of integrated circuits and are widely used to multiply clock fanout without introducing timing drift. Key features of the CY23EP09SXI-1HT include 9 low-skew outputs, 45 ps typical output-to-output skew, an on-chip PLL with internal feedback, and a -1H higher-drive variant compared to standard -1 devices. The device supports industrial operating temperature ranges and is qualified for fanout buffer applications where low jitter and matched propagation delays are required across multiple loads. The CY23EP09SXI-1HT is widely used in networking line cards, server motherboards, storage controllers, and telecommunications infrastructure as a clock distribution element. The 'I' suffix in the MPN denotes industrial temperature grade, while 'T' indicates Tape & Reel packaging. It is pin-compatible with the broader CY23EP09 family, allowing board designers to swap standard and -1H drive variants without layout changes. When designing with this device, ensure the REF input clock meets the PLL lock range and that decoupling capacitors are placed close to VDD pins. Output load matching is critical to maintain skew performance across the nine outputs.
DS1302Z+ - 31B RTC with 3-Wire Serial | Analog Devices
The Analog Devices DS1302Z+ is a trickle-charge timekeeping IC containing a real-time clock/calendar, 31 bytes of static RAM, and a 3-wire serial interface in an 8-SOIC package measuring 0.154 inches wide and 3.90 mm wide. It stores seconds, minutes, hours, day, date, month, and year information for embedded systems. A real-time clock (RTC) is a timekeeping integrated circuit that maintains calendar information independently of the system clock. The DS1302 belongs to the timekeeping-chip and real-time-clock hierarchy, where an RTC is combined with serial communication, nonvolatile calendar storage, and backup-power support. Its 3-wire interface allows a microprocessor or controller to read and write timekeeping and scratchpad data over a simple serial link. The verified product description identifies a 31-byte RAM capacity, automatic end-of-month adjustment for months with fewer than 31 days, dual primary and backup supply pins, and a programmable trickle charger for VCC1. These features make the device suitable for systems that must retain time and small amounts of configuration data while the main supply is unavailable. The 8-SOIC package also supports conventional surface-mount PCB assembly. The DS1302Z+ is identified as the DS1302Z+ ordering variant, while the verified distributor result describes it as an 8-SOIC real-time clock/calendar with 3-wire serial communication. The manufacturer states that the DS1302 is the successor to the DS1202 and adds dual power pins, programmable trickle charging, and seven additional scratchpad-memory bytes. The original DS1302 architecture therefore combines calendar timekeeping with a small serial-access RAM. Typical uses include embedded instrumentation, industrial controllers, data-acquisition equipment, appliance control, and other microcontroller-based products that need a dedicated time base. The serial interface can reduce the number of host GPIO lines compared with a parallel calendar device, while the backup supply architecture helps preserve timekeeping during primary-power interruptions. Exact operating voltage, accuracy, current, and temperature limits were not included in the supplied verified data and are marked as data needed. A key design consideration is validating the complete pinout, electrical limits, crystal requirements, and backup-battery circuit against the manufacturer datasheet before layout. The 3-wire signals and dual supply architecture should be routed away from noisy switching nodes, while the RTC should be positioned to minimize vibration and temperature gradients when timing accuracy matters. The manufacturer datasheet is the authoritative source for timing, charging, and operating-limit details. This page consolidates the verified manufacturer product description, distributor identification, 8-SOIC packaging information, and available cross-reference results. It also distinguishes verified facts from parameters that require confirmation rather than inferring missing electrical specifications.
DS1307+ - I2C RTC with 56B SRAM | Maxim Integrated
The Maxim Integrated DS1307+ is a low-power, 64 x 8 serial real-time clock with 56 bytes of nonvolatile SRAM, I2C communication, and an 8-pin PDIP package. It tracks seconds, minutes, hours, day, date, month, and year in binary-coded decimal format, while automatically accounting for months with fewer than 31 days. The device operates from a single 5V supply and communicates through a two-wire, bidirectional serial bus. Its low-power design makes it suitable for embedded systems that retain calendar time when the main supply is removed. A real-time clock is a dedicated timekeeping integrated circuit that continues tracking wall-clock time independently of a microcontroller’s main program. The DS1307+ belongs to the RTC and clock/calendar category, within broader timing and embedded semiconductor systems. Its internal registers provide seconds, minutes, hours, calendar fields, and control/status information, while the SRAM provides 56 bytes for general nonvolatile data such as configuration values, counters, or small status records. The principal features include a 64 x 8 register space, BCD clock and calendar data, automatic end-of-month adjustment, I2C serial access, and a two-wire interface. Address and data are transferred serially over the same bus, allowing a host microcontroller to initialize the oscillator, read the current time, write new time values, and access the SRAM. The verified manufacturer page identifies the DS1307 as a production part and lists a starting list price of $2.39, while LCSC reports DS1307+ pricing from $2.9452. The DS1307+ uses an external 32.768 kHz crystal as its timebase. Crystal selection and layout strongly influence accuracy, so the oscillator should be placed close to the device and surrounded by a quiet ground return. The I2C bus requires pull-up resistors, and the device’s 5V-only supply requirement should be checked against the host system before substitution. The 8-DIP package is suitable for through-hole prototype boards, but a surface-mount variant would be preferable in compact production designs when pin compatibility is not required. Typical uses include microcontroller data loggers, industrial controllers, embedded instrumentation, access-control systems, and products requiring calendar timestamps after power loss. The I2C interface also makes the DS1307+ convenient for systems already using PCF8574, PCA9557, STM32, MSP430, or similar embedded controllers. Its SRAM can retain small operating parameters without using the MCU’s nonvolatile memory. When designing around the DS1307+, verify the complete pinout, crystal connection, supply decoupling, I2C pull-up arrangement, and battery-backed supply architecture before layout release. Firmware must also use the correct device address and BCD register format. For designs where higher time accuracy or a smaller surface-mount footprint is required, a temperature-compensated RTC may be a better architectural choice. This page combines verified manufacturer information, distributor availability, package details, application guidance, and honest replacement analysis. It also distinguishes true drop-in interchangeability from functional alternatives that may require firmware, PCB, or crystal changes.
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.