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ADF5000BCPZ - 18 GHz Divide-by-2 RF Prescaler | Analog Devices
The Analog Devices ADF5000BCPZ is an 18 GHz, divide-by-2 RF prescaler IC with differential 100 ohm outputs, supplied in a 16-lead WFQFN exposed-pad package. It operates from a 3.3 V supply and is designed to divide high-frequency RF signals down to a frequency suitable for a PLL frequency synthesizer or frequency divider. An RF prescaler is a clock-and-timing semiconductor that divides an input carrier into a lower-frequency signal while preserving the phase relationship needed by phase-locked loops. The ADF5000 belongs to the RF prescaler hierarchy, where it serves as a fixed divide-by-2 block ahead of a PLL such as the ADF4156 or ADF4106. Its differential outputs reduce common-mode effects and provide a suitable interface to compatible RF clock circuits. The primary features of the ADF5000BCPZ include operation to 18 GHz, a fixed divide-by-2 function, low-noise and low-power operation, a 3.3 V supply requirement, and differential 100 ohm RF outputs. These characteristics make it particularly useful when a synthesizer requires an RF input above the native frequency range of its PLL front end. The exposed pad also provides the primary thermal path when used in space-constrained microwave assemblies. Technically, the ADF5000 is intended as a fixed divider rather than a programmable integer divider. Its divide ratio is not selected by a register or external control interface. The RF signal therefore enters the prescaler, is divided by two, and exits through the differential output network for subsequent phase comparison or frequency measurement. The verified manufacturer documentation identifies the ADF4156 and ADF4106 as example downstream PLL devices. Typical applications include microwave synthesizer subsystems, phase-locked-loop reference chains, RF test and measurement equipment, wireless infrastructure, satellite communications, and instrumentation requiring division of carrier frequencies into a range accepted by a PLL or counter. The differential 100 ohm output arrangement is particularly valuable in controlled-impedance RF layouts. Designers should preserve controlled impedance on the RF input and output paths, provide the supply decoupling specified by the manufacturer datasheet, and validate the exposed-pad thermal design at the highest operating frequency. RF trace geometry, return paths, component placement, and ground-plane continuity can materially affect divider performance at microwave frequencies. This product page combines the verified manufacturer specifications, distributor availability, purchasing guidance, comparison fields, and practical RF design considerations. Missing electrical details are explicitly identified rather than inferred, allowing engineers to evaluate the ADF5000BCPZ against the requirements of their specific microwave design.
ADF5355BCPZ - 13.6 GHz Integrated VCO PLL | Analog Devices
The Analog Devices ADF5355BCPZ is a microwave wideband frequency synthesizer with an integrated voltage-controlled oscillator, operating up to 13.6 GHz and housed in a 32-pin WFQFN exposed-pad package. It supports fractional-N and integer-N phase-locked-loop architectures, with a three-wire register interface, digital lock detection, programmable output muting, and hardware and software power-down functions. A phase-locked loop is a feedback-controlled frequency-generation system that compares a divided reference signal with a synthesized output and drives a voltage-controlled oscillator toward phase and frequency lock. The ADF5355 integrates the oscillator core, programmable frequency dividers, charge-pump circuitry, reference and feedback paths, and digital control into one RF synthesizer. This placement within the clock-and-timing and frequency-generation hierarchy simplifies microwave signal-source designs compared with a discrete VCO and divider arrangement. Principal features include fractional-N operation for fine frequency resolution, integer-N operation for simpler channelization, programmable output attenuation, and an RFOUT stage that can remain muted until lock is detected. The mute-till-lock-detect function, controlled through a register bit, can suppress unwanted output during acquisition. The device also provides pin-controlled and software-controlled muting, allowing the host circuitry to manage RF visibility during startup or calibration. The ADF5355 supports analog and digital power-supply inputs from 3.15 V to 3.45 V, while its charge-pump and VCO supply range is 4.75 V to 5.25 V. An external loop filter and external reference frequency are required for the complete synthesizer implementation. These interface requirements make the device suitable for systems in which the designer needs direct digital frequency control while retaining a conventional PLL-based RF architecture. Typical applications include microwave test equipment, radar and communications signal sources, phase-noise-sensitive RF test systems, frequency converters, and local-oscillator generation for wireless infrastructure. The integrated VCO reduces board area compared with a discrete oscillator implementation, while fractional-N synthesis can provide frequency offsets that would otherwise require a fine-resolution reference or complex calibration procedure. The principal design trade-off is the need for careful RF layout, stable supplies, and an appropriately designed external loop filter. The exposed package pad requires effective thermal management, and the VCO, charge pump, reference, and output-return paths must be controlled to avoid degrading phase noise or lock performance. Output power and frequency accuracy should therefore be evaluated together rather than relying on nominal synthesizer features alone. This product data consolidates verified manufacturer information, distributor pricing, package details, application guidance, and engineering checks for the ADF5355BCPZ. It also explicitly identifies the missing package-pin, thermal, absolute-maximum, and qualified drop-in replacement data rather than presenting unverified numbers as production specifications.
ADF5356BCPZ - 13.6 GHz Wideband PLL Synthesizer | Analog Devices
The Analog Devices ADF5356BCPZ is a 13.6 GHz microwave wideband frequency synthesizer with an integrated VCO, housed in a 32-lead WFQFN exposed-pad CSP package. It supports fractional-N or integer-N phase-locked-loop operation with an external loop filter and reference frequency. Its fundamental VCO operates from 3400 MHz to 6800 MHz, while internal divide-by-1 through divide-by-64 paths permit RF output frequencies as low as 53.125 MHz. A microwave wideband synthesizer is a clock-and-timing IC that combines a voltage-controlled oscillator with a phase-locked loop to produce a stable, programmable output frequency. The broader hierarchy is frequency synthesizer > PLL frequency synthesizer > clock generation and timing IC > integrated circuit. This architecture is useful when a system needs precise RF frequency generation from a stable reference without implementing every oscillator and feedback function as discrete circuitry. The ADF5356 supports integer-N and fractional-N synthesis, giving designers flexibility in channel spacing, reference-to-output ratios, and phase-noise planning. Its output stage includes divide ratios of 1, 2, 4, 8, 16, 32, and 64, extending usable output coverage below the VCO fundamental range. According to the Analog Devices product page, the wideband microwave VCO supports frequency operation across the stated 3400 MHz to 6800 MHz fundamental range. The integrated microwave VCO is the central architecture of the device. A PLL locks the VCO to an external reference, while an external passive loop filter shapes loop dynamics and phase noise. Fractional-N operation permits division ratios that are not integers, although final settling time, spurious performance, and loop-filter design depend on the complete system configuration. The exact supply voltages, reference-frequency limits, register map, phase-noise values, and temperature limits are not included in the supplied web results. Typical uses include microwave and RF signal sources, communications test equipment, local oscillators, frequency-conversion subsystems, and instrumentation requiring programmable RF outputs. The divider chain makes the device relevant when a system needs output below the 3400 MHz to 6800 MHz VCO range. The evaluation hardware identified in the verified data includes a differential 122.88 MHz reference TCXO, a loop filter, USB interface, power connections, and SMA connectors. For PCB implementation, follow the exposed-pad land pattern and thermal-via recommendations in the manufacturer datasheet. The external loop filter, reference components, RF output matching network, supply decoupling, and exposed-pad thermal design materially affect phase noise, lock behavior, output power, and system stability. Verify all voltage, temperature, and absolute-maximum limits before releasing a production design. This product record consolidates the verified manufacturer function, frequency-range, divider, mute-function, package, evaluation-board, distributor, and replacement information into one engineering reference. It also distinguishes documented drop-in candidates from broader functional alternatives and flags unavailable electrical data explicitly rather than estimating it.
ADF5610BCCZ - 14.6 GHz Wideband VCO PLL | Analog Devices
The Analog Devices ADF5610BCCZ is an integer-N and fractional-N wideband microwave synthesizer with an integrated VCO, designed for RF and microwave signal-generation applications. The device operates with an integrated VCO fundamental frequency range of 3650 MHz to 7300 MHz, with internally doubled VCO output routed to RFOUT. It also provides a divided differential output covering divide ratios from 1 through 128, allowing RF output frequencies as low as 57 MHz. The ADF5610BCCZ is packaged in a 48-terminal VFLGA with exposed pad, designated HLGA in distributor listings, and uses a 3-wire serial interface for programming. Its maximum listed RF frequency is 14.6 GHz, making it suitable for wideband microwave frequency synthesis in instrumentation, communications, radar, and test systems. The synthesizer requires an external reference source and an external loop filter for fractional-N or integer-N operation. According to the Analog Devices ADF5610 product page, the device supports software programming through the SDP-S USB interface. The ADF5610BCCZ is suitable for engineers designing compact, high-frequency RF signal sources where integrated VCO functionality, wide tuning range, and programmable divide ratios are important. The 48-VFLGA exposed-pad package also requires careful PCB layout and thermal design to preserve RF performance and reliable operation.
ADN2816ACPZ - 10-675 Mb/s CDR IC, 32-LFCSP | Analog Devices
The Analog Devices ADN2816ACPZ is a continuous-rate clock and data recovery (CDR) IC with integrated quantizer and 1:1 output multiplexer, supporting data rates from 10 Mb/s to 675 Mb/s in a 32-lead LFCSP-WQ (5x5 mm) package. It is designed for SONET/SDH optical receivers and automatically locks to any incoming NRZ data rate in its operating range without an external reference clock or programming. The device meets all Telcordia GR-253-CORE jitter specifications including jitter transfer, jitter generation, and jitter tolerance. A CDR IC is a specialized mixed-signal device that recovers a clean clock signal from a serial data waveform that has propagated over lossy media, then re-times the data using that recovered clock. CDRs are a subset of the broader clock-and-timing IC family, sitting alongside jitter attenuators, PLL frequency synthesizers, and clock buffers; in optical transponder hierarchies they are positioned between the transimpedance amplifier (TIA) and the framer/mapper ASIC. Key features include a wide 10 Mb/s to 675 Mb/s continuous-rate range, automatic rate detection via on-chip PLL locking, integrated limiting amplifier with adjustable threshold, and a CML output interface that interfaces directly to downstream framer ASICs. The part requires no external reference clock and provides loss-of-signal (LOS) and lock-detect indicator outputs for system-level monitoring. The ADN2816 uses a phase-locked loop architecture with a high-Q internal VCO and lock detector. The internal limiting amplifier provides signal threshold adjustment for incoming data, while the CDR PLL provides the recovered clock with low jitter generation meeting SONET requirements. The output multiplexer integrates a 1:1 selector for serial data routing. Typical applications include SONET OC-1/OC-3/OC-12/SDH STM-1/STM-4 optical transponder designs, Fiber Channel and Gigabit Ethernet serializer/deserializer interfaces, and WDM system line cards where compact CDR functionality is required. It is also suitable for test and measurement equipment recovering clocks from NRZ optical or electrical test signals. When designing with the ADN2816ACPZ, the VEE pins must be soldered directly to the ground plane to minimize series inductance, and Pin 23 (ground return for the output buffers) requires multiple parallel vias if connected through internal planes. Decoupling capacitors should be placed close to each supply pin. This page synthesizes distributor pricing, drop-in same-brand and cross-brand alternatives, and PCB layout guidance from the manufacturer datasheet - information not consolidated on distributor product pages.
BCM55030SB01 - 10G EPON MDU Clock/Timing IC | Broadcom
The Broadcom Limited BCM55030SB01 is an application-specific clock and timing integrated circuit identified by distributor listings as a 10G EPON MDU device. It belongs to the Clock & Timing category within integrated circuits and is supplied in a surface-mount package designated by the SB01 ordering suffix. The verified source data identifies the component as an IC output device, but it does not publish the operating voltage, output frequency, timing tolerance, temperature range, or pin configuration needed for a complete electrical specification. An application-specific clock and timing IC is a specialized semiconductor that generates, distributes, or conditions clock signals within a defined equipment architecture. Unlike a generic oscillator, an application-specific timing device is optimized around a particular system or transceiver ecosystem. In an EPON MDU, clock and timing support can be required alongside burst-mode transmitters, receivers, serializers, and other line-access circuitry, where consistent clocking contributes to stable data throughput and low bit-error rates. The key verified identification for BCM55030SB01 is its association with a 10G EPON MDU application. That association is more useful than a generic category label because it indicates the intended equipment context in which Broadcom positioned the part. Distributor records classify it under Application Specific Clock/Timing, while other marketplace listings describe it as an IC Output and an application-specific timer. The Broadcom family also includes closely related BCM55030-series devices, but the supplied evidence does not establish their pin compatibility or parameter differences with this exact suffix. Because no manufacturer datasheet parameters or verified pricing were returned in the source data, electrical values such as supply voltage, output frequency range, jitter, reference-input requirements, and operating temperature must be confirmed before design release. Likewise, the physical package dimensions and pad assignment remain unverified. The package diagram is therefore represented by the default library graphic rather than an invented package-specific drawing, and the pinout is intentionally omitted instead of presenting unverified pin names. Typical engineering use is limited to designs already qualified around the Broadcom 10G EPON MDU signal chain, including line-card, aggregation, and access-network equipment. For new designs, engineers should request the controlled Broadcom datasheet and obtain a sample of BCM55030SB01 to confirm reference requirements, output behavior, decoupling, layout constraints, and production availability. Distributor listings report availability and sourcing options, but lead time, lifecycle status, and unit pricing require a current quotation. The practical design consideration is that this part should not be treated as a generic clock source or selected by package name alone. Its suitability depends on compatibility with the associated EPON MDU clock architecture, reference source, and board-level timing budget. Procurement should also confirm whether BCM55030SB01 is an active orderable configuration or a legacy ordering code within the broader BCM55030 family. This page consolidates the verified distributor identity, application classification, source traceability, and engineering-selection guidance for BCM55030SB01. It also separates confirmed information from unavailable electrical, mechanical, pricing, and lifecycle data, helping buyers request the correct manufacturer documentation before committing the part to a production BOM.
BCM8324AIFBG - 10G CDR Optical Transport IC | Broadcom
Broadcom BCM8324AIFBG is an application-specific clock and timing integrated circuit identified by distributor records as a 10G CDR for optical transport applications. The device combines clock and data recovery functions in a single IC intended for high-speed optical-transport signal chains. Verified listings classify BCM8324AIFBG under Clock/Timing and Application Specific Clock/Timing, while its Broadcom manufacturer designation, RoHS status, and exact orderable suffix are retained without substitution. An application-specific clock and timing IC is a semiconductor category combining digital timing functions with circuitry optimized for a defined system role. In this case, the listed 10G CDR function places BCM8324AIFBG in the hierarchy of clock and timing ICs, clock and data recovery devices, optical-transport interface components, interface ICs, and integrated circuits. This classification is important because a CDR is not simply a free-running clock generator: it recovers timing information from a received high-speed stream and supports signal synchronization. The principal verified feature is the device's stated 10G CDR optical-transport role. That designation identifies the nominal optical-transport data-rate class as 10G, but the supplied records do not expose a complete electrical specification table. Consequently, details such as supply voltage, recovery range, interface standards, jitter performance, operating temperature, clock-output configuration, and maximum data rate cannot be stated independently. Distributor pages classify the part as an IC output, reflecting Broadcom's product taxonomy rather than providing a standalone discrete output rating. Broadcom BCM8324AIFBG is supplied under ordering code BCM8324AIFBG. The exact package drawing, pin count, exposed-pad arrangement, pinout, and mechanical dimensions were not included in the retrieved verified data. Those package-dependent details must therefore be confirmed against the manufacturer datasheet before PCB layout, footprint selection, or pin-level substitution work. They should not be inferred solely from the Broadcom naming code or the FBG suffix. The device is relevant to 10G optical transport modules and line systems where recovered clock and data must be handled within a dedicated timing device. Potential system contexts include optical transceiver modules, transport-network line cards, wavelength systems, and data-conversion equipment where 10G-class recovery is required. Whether BCM8324AIFBG is suitable for a particular design remains dependent on the unreported voltage, recovery range, reference-clock, interface, package, and signal-integrity requirements. For implementation, engineers should obtain the official Broadcom datasheet and evaluate the complete timing, supply, recovery, and package specifications before schematic capture. System-level CDR performance also depends on board-level reference-clock cleanliness, controlled impedance, return loss, power-supply isolation, and thermal management. Optical-transport designs should validate the complete transmitter, optical channel, CDR, and data-path interaction rather than treating the IC specification in isolation. This page consolidates verified distributor classifications, ordering information, RoHS information, and sourcing links for BCM8324AIFBG while explicitly separating confirmed facts from unavailable technical fields. It also records that the supplied cross-reference search did not identify a verifiable pin-to-pin replacement, avoiding misleading alternatives that could require an unintended PCB redesign.
BCM8324BIFBG - 10G CDR Optical Transport IC | Broadcom
Broadcom BCM8324BIFBG is an application-specific clock and timing integrated circuit identified by distributor listings as a 10G CDR optical transport device. The part belongs to Broadcom's optical-networking semiconductor portfolio and is intended for systems that require clock and data recovery associated with 10-gigabit-class optical transport links. The orderable BCM8324BIFBG configuration is supplied in a tray according to the available distributor information. A clock and data recovery IC is a specialized digital timing device that reconstructs a usable data stream and clock when the received signal has experienced timing distortion, noise, or attenuation. In optical-transport equipment, a CDR can support a transmitter or receiver signal path by recovering timing information before the data is passed to subsequent digital logic, framing, switching, or monitoring circuitry. The BCM8324BIFBG's stated 10G CDR function makes it more applicable to high-speed optical communication than to ordinary low-speed clock distribution. The available verified records classify BCM8324BIFBG as an application-specific clock/timing IC and, in one distributor listing, as an IC output. These descriptions distinguish it from conventional fixed-frequency clock generators and buffer-driver families. The supplied data does not expose the underlying architecture, supported standards, lane configuration, electrical interfaces, operating voltage, power consumption, temperature range, or recovery performance, so those details should be confirmed against the manufacturer documentation before design use. The device is relevant to optical transport systems, line cards, high-speed network equipment, and clock-recovery subsystems. Its use can be considered when a board must recover timing from a 10G-class signal rather than merely distribute a reference clock. Because the available sources do not specify whether the CDR performs serial, parallel, or other data recovery, engineers should verify signal topology, reference-clock requirements, and interface voltage levels against the applicable Broadcom documentation. A key procurement consideration is that the search results show distributor inventory and request-quote channels but do not provide a consistent numeric price or a manufacturer lifecycle statement. Availability should therefore be confirmed directly with an authorized distributor. This page combines the verified distributor descriptions, sourcing links, application guidance, and explicit engineering caveats without converting unsupported marketing snippets into electrical specifications.
BQ32000DR - Serial RTC with Battery Backup, I2C, 8-SOIC | Texas Instruments
The Texas Instruments BQ32000DR is a serial real-time clock (RTC) with automatic battery backup supply switchover and an integrated trickle charger for backup capacitors or non-rechargeable batteries. It uses an industry-standard I2C interface up to 400 kHz and an external 32.768 kHz crystal with on-chip calibration adjustment from -63 ppm to +126 ppm, and it includes an oscillator-fail (OF) flag for system diagnostics, all housed in an 8-pin SOIC package. A real-time clock (RTC) is a low-power timing IC that maintains accurate wall-clock time (seconds, minutes, day, month, year) independently of the host MCU, allowing the system to keep time even when main power is removed. RTCs sit in the broader clock & timing hierarchy (RTC -> clock IC -> timing IC -> semiconductor) and are typically paired with a backup energy source such as a coin cell or supercapacitor to ride out power interruptions. The BQ32000DR's integrated trickle charger removes the need for an external charging circuit, simplifying the BOM while still supporting rechargeable backup sources. Key specifications include I2C serial interface operation up to 400 kHz (Fast Mode), a programmable calibration range of -63 ppm to +126 ppm for crystal ageing compensation, automatic switchover to backup supply at a typical threshold of approximately 2.5 V, integrated oscillator-fail detection with OF flag, and an operating supply range of 3.0 V to 3.6 V. The 8-SOIC package footprint is industry standard, allowing drop-in replacement of legacy RTCs in many designs. Architecturally, the BQ32000DR uses a bandgap reference, a divider chain from the 32.768 kHz crystal, BCD-format time/date counters, and an I2C slave controller. The automatic backup switchover compares VCC to the backup supply and seamlessly routes power to the RTC core, eliminating host-side timekeeping recovery on power-up. Typical applications include smart electricity meters, industrial controllers, point-of-sale terminals, medical data recorders, and any embedded system that must retain wall-clock time across main-power loss. It also fits consumer electronics with battery-backed user clocks. When designing with this device, ensure the crystal load capacitance matches the chosen 32.768 kHz crystal (typically 12.5 pF) and place both crystal traces close to the XIN/XOUT pins. Avoid routing noisy switching signals near the crystal to keep jitter and time drift low. This page synthesizes distributor pricing, drop-in alternatives, and design notes not always consolidated in the manufacturer datasheet, giving engineers a single reference for evaluation and procurement.
BQ4285EP - 114B RTC With NVRAM Control | Texas Instruments
The Texas Instruments BQ4285EP is a CMOS real-time clock and calendar with 114 bytes of general nonvolatile storage, a 100-year calendar, alarm features, and battery operation in a 24-pin PDIP package. It is designed as a direct clock/calendar replacement for IBM AT-compatible computers and provides 32.768 kHz output, three maskable interrupt sources, and wake-up capability. Verified listings identify the device as a real-time clock with 114-byte parallel NVRAM and a 0.600-inch, 15.24 mm 24-DIP package. An RTC with integrated NVRAM is a clock-and-timing integrated circuit that maintains time-of-day and calendar information while providing persistent storage for system configuration or diagnostic data. Its position in the system hierarchy is real-time clock -> clock/calendar -> timekeeping IC -> semiconductor. The integrated nonvolatile memory allows a computer or embedded system to retain configuration values across power loss without relying on a separate memory device. Key features include BCD or binary clock and calendar formats, day-of-week calendar support, alarm functionality, three maskable interrupt sources, a square-wave output, and a 32.768 kHz output for sustaining power-management activities. The verified data specifically confirms 114 bytes of general nonvolatile storage and battery operation. The 3 V operating version and enhanced RTC/NVRAM-control description are also identified in the supplied search results. The BQ4285E/L family uses CMOS circuitry for low-power microprocessor-peripheral operation. The RTC counts seconds, minutes, hours, day of week, date, month, and year, including leap-year handling. The supplied datasheet search result also identifies over 10 years of operation in the absence of power as a feature of the compared DS12887-class devices, but that specific endurance claim is not independently assigned to BQ4285EP here. Typical applications include IBM PC-compatible industrial and embedded computers, data-logging equipment, instrumentation, embedded control systems, and systems requiring persistent configuration storage beside a real-time clock. Its 24-DIP package favors through-hole legacy and industrial controller designs rather than compact surface-mount systems. When designing around the BQ4285EP, verify the complete 24-pin interface, backup-battery implementation, interrupt polarity, alarm configuration, and NVRAM access protocol against the manufacturer datasheet. Do not assume that a similarly named RTC is a replacement unless its package dimensions, pin names, electrical limits, and firmware-visible registers are confirmed compatible.
BQ4285LS - 114x8 NVRAM RTC, 3V | Texas Instruments
The Texas Instruments BQ4285LS is a 3V real-time clock and calendar IC with 114 bytes of general-purpose nonvolatile storage, a 24-bit parallel interface, and a 24-SOIC package measuring 0.295 inches wide by 7.50 mm. It is an enhanced RTC with NVRAM control designed as a direct clock/calendar replacement for IBM AT-compatible computers and related equipment. The verified product listing identifies BQ4285LS as a clock/calendar IC, while the datasheet search result identifies its 114x8 NVRAM organization and L-version 3V operation. A real-time clock, or RTC, is a clock-and-timing semiconductor that maintains calendar time independently of the system's main processor. It normally includes oscillator circuitry, calendar counters, alarm functions, and nonvolatile registers. The BQ4285LS belongs to the RTC and clock/calendar hierarchy and uses battery-backed nonvolatile memory to preserve time and application data when the main supply disappears. The principal verified feature is 114 bytes of general nonvolatile storage, organized in the source material as 114x8 NVRAM with NVRAM control. Its enhanced functions include selectable BCD or binary clock and calendar data and a calendar that includes day-of-week information. These characteristics make the device useful where the host needs autonomous timekeeping plus persistent configuration, counters, or diagnostic records in the same package. The BQ4285LS uses a 24-bit parallel connection, as shown in its 114-B parallel interface classification. Parallel communication can simplify connection to legacy motherboard buses and embedded controllers that already read and write byte-wide registers. Firmware must still match the device's register map, address behavior, alarm logic, and supply-sequencing requirements; software compatibility cannot be inferred solely from package similarity. Typical use cases include IBM AT-compatible computer clock/calendar designs, industrial controllers, data-acquisition equipment, embedded instruments, and legacy systems that need retained time and small amounts of nonvolatile data. The 24-SOIC package supports conventional surface-mount PCB assembly, while the parallel bus and NVRAM simplify designs that do not need a modern serial RTC. Designers should verify oscillator accuracy, backup-current limits, voltage thresholds, alarm behavior, and register timing against the manufacturer datasheet before release. The verified data does not provide those numeric limits, so they must not be assumed. This page distinguishes the BQ4285LS from merely similar RTCs by organizing confirmed capabilities, sourced uncertainty, and replacement constraints around the actual device.
BQ4285P-SB2 - 114x8 NVSRAM RTC Clock/Calendar | TI
The Texas Instruments BQ4285P-SB2 is a real-time clock (RTC) with 114 x 8 NVRAM and NVRAM control, packaged in a 24-pin DIP (0.600 inch, 15.24 mm) through-hole package. It combines a clock/calendar function with 114 bytes of nonvolatile storage and is positioned for IBM AT-compatible computer and other embedded timing applications. According to the verified product listings, the device is identified as a clock/calendar IC with parallel 24-DIP construction. A real-time clock is a clock-and-timing integrated circuit that maintains time and calendar information independently of the system’s main processor. It is useful when a system must preserve date, time, and configuration data across power loss. The BQ4285P-SB2 extends that role by integrating 114 bytes of NVRAM and NVRAM control, allowing the same device to provide both timekeeping and retained storage. The BQ4285P-SB2 is listed by Texas Instruments and distributors as a parallel-interface RTC clock/calendar with 114 bytes of NVRAM. Its 24-DIP package is intended for through-hole PCB assembly and provides a direct package format for designs requiring a conventional DIP footprint. The verified material also describes compatibility-oriented use in IBM AT-compatible computers and functionally compatible calendar arrangements, although exact timing, voltage, and electrical limits must be taken from the manufacturer datasheet. Typical applications include legacy computer clock/calendar replacement, industrial control systems requiring retained configuration data, data-acquisition equipment, instrumentation, embedded systems with battery-backed timekeeping, and products that need both RTC data and a small nonvolatile parameter store. The integrated NVRAM can simplify designs by reducing the number of separate retention components, provided the host software manages the device interface correctly. The principal design consideration is interface compatibility. Because this is a 24-pin DIP through-hole device with a parallel clock/calendar and NVRAM organization, PCB layout, signal levels, supply requirements, and software register access must be verified before substitution. Do not assume that a similarly named RTC is interchangeable without comparing the manufacturer pinout and datasheet timing specifications. The verified data supports the 114 x 8 NVRAM organization and 24-DIP package, but does not provide every electrical timing parameter in the supplied records. This product summary synthesizes the verified distributor descriptions, manufacturer-linked datasheet result, package information, and cross-reference findings. It distinguishes documented facts from parameters that require direct confirmation from the complete Texas Instruments datasheet, helping engineers identify the correct RTC before requesting samples or placing an order.
BQ4285S-SB2 RTC with 114x8 NVRAM | Texas Instruments
The Texas Instruments BQ4285S-SB2 is a real-time clock and calendar integrated circuit with 114 x 8-bit NVRAM and NVRAM control in a 24-SOIC package. According to the verified distributor data, it provides a parallel real-time clock interface, a 114-byte NVRAM, and clock/calendar functionality for systems requiring persistent timekeeping and small nonvolatile data storage. The device is positioned as a real-time clock IC with NVRAM rather than as a general-purpose microcontroller, and its 24-SOIC package supports conventional surface-mount assembly. A real-time clock is a clock-and-timing semiconductor that maintains calendar time independently of the host processor's main clock. An RTC commonly includes oscillators, registers, calendar logic, alarm functions, and an interface for host reads and writes. Adding NVRAM allows the same device to retain small amounts of configuration or system data when power is removed. In the broader semiconductor hierarchy, the BQ4285S-SB2 belongs to integrated circuits, clock and timing devices, and RTCs with embedded nonvolatile memory. The verified listing identifies the BQ4285S-SB2 as a 24-SOIC real-time clock with 114 bytes of parallel NVRAM and NVRAM control. The Mouser listing likewise identifies it as a 114 x 8 NVSRAM and NVSRAM control device. These details make it relevant to legacy computer, embedded-control, industrial, and instrument designs that need timekeeping plus compact persistent storage. The device is also associated with AT-compatible clock/calendar use in the supplied search results, but the exact electrical limits and operating conditions must be taken from the manufacturer datasheet. Because the supplied data does not expose the complete electrical tables, pin names, oscillator accuracy, voltage range, current consumption, or temperature limits, those values are not inferred here. The SOIC footprint and pin count are identifiable from the distributor description, but a complete pinout cannot be responsibly generated without the manufacturer pin table. For new layouts, download the official BQ4285S datasheet and compare every power, ground, interface, and control signal before assembly. Typical implementation places the RTC beside a host bus or embedded processor, connects its backup supply or supply rails as specified by the manufacturer, and routes the parallel interface to the controlling logic. NVRAM can hold configuration values, counters, or small audit records, but its endurance and retention behavior should be verified in the datasheet rather than inferred from the memory size. The main design trade-off is the need to validate legacy interface timing and supply requirements against the exact system architecture. This page summarizes the verified distributor identity, package, clock/calendar role, and 114 x 8 NVRAM function, then separates verified facts from missing technical details. It also records that the supplied cross-reference search identifies DS14285S and DS1685SN-5+ as comparison candidates, while package, pin compatibility, and parameter matching still require datasheet-level validation before any replacement is approved.
BQ4285S-SB2G4 - Real-Time Clock with NVRAM Control | TI
The Texas Instruments BQ4285S-SB2G4 is a real-time clock and calendar IC with NVRAM control, a 114-byte parallel interface, and a 24-pin SOIC package. The verified distributor listing identifies the device as a commercial-temperature real-time clock and calendar, while the family datasheet identifies the BQ4285S as an RTC with NVRAM control. Its parallel data interface supports structured access to calendar, clock, alarm, and related control functions. A real-time clock, or RTC, is a clock-and-timing integrated circuit that maintains time independently of the main processor. The RTC category belongs to the clock-and-timing hierarchy, which also includes timers, oscillators, and timing controllers. An RTC with NVRAM control can maintain calendar information while providing a mechanism for retaining or managing small amounts of volatile data across resets or controlled power transitions. The BQ4285S-SB2G4 provides a 114-byte parallel interface and uses 24 SOIC pins. The verified package data describes a 0.295-inch, 7.50 mm-wide SOIC with a gull-wing terminal form and rectangular package shape. The verified date-format information identifies support for YY-MM-DD-dd and BCD representations, which is useful for systems requiring readable calendar data or binary-coded decimal processing. The family datasheet pin listing includes oscillator-related X1 and X2 connections together with address signals AD0 through AD7. These address lines are relevant when the RTC registers are mapped into a wider system bus or memory-style interface. The parallel interface distinguishes this device from compact serial RTCs and makes it appropriate for platforms whose processor bus can accommodate the additional address and data routing. Typical uses include industrial controllers, embedded instruments, data-acquisition equipment, and systems that require persistent calendar data, scheduled events, or centralized timekeeping. The 24-pin SOIC footprint also supports conventional surface-mount PCB assembly. Designers should verify the complete electrical limits, oscillator requirements, alarm behavior, and NVRAM-control implementation against the manufacturer datasheet before release. For a new design, begin with the manufacturer datasheet rather than relying only on distributor summaries. Confirm supply voltage, current consumption, oscillator frequency, accuracy, alarm behavior, timing characteristics, and register access details. Verify the PCB land pattern and decoupling requirements for the exact 24-SOIC package, especially where long parallel traces or slow bus edges could introduce signal-integrity concerns. This page combines the verified 114-byte parallel interface and 24-SOIC package information with structured sourcing, comparison, and design guidance. It also distinguishes verified catalog facts from parameters that still require confirmation from the manufacturer datasheet, helping engineers build a reliable RTC design without treating incomplete distributor metadata as a complete electrical specification.
BQ4285S-SB2TR RTC with 114x8 NVRAM | Texas Instruments (Tape & Reel)
The Texas Instruments BQ4285S-SB2TR is a real-time clock and calendar integrated circuit with 114 x 8-bit NVRAM and NVRAM control in a 24-SOIC package. According to the verified distributor data, it provides a parallel real-time clock interface, a 114-byte NVRAM, and clock/calendar functionality for systems requiring persistent timekeeping and small nonvolatile data storage. The device is positioned as a real-time clock IC with NVRAM rather than as a general-purpose microcontroller, and its 24-SOIC package supports conventional surface-mount assembly. A real-time clock is a clock-and-timing semiconductor that maintains calendar time independently of the host processor's main clock. An RTC commonly includes oscillators, registers, calendar logic, alarm functions, and an interface for host reads and writes. Adding NVRAM allows the same device to retain small amounts of configuration or system data when power is removed. In the broader semiconductor hierarchy, the BQ4285S-SB2TR belongs to integrated circuits, clock and timing devices, and RTCs with embedded nonvolatile memory. The verified listing identifies the BQ4285S-SB2TR as a 24-SOIC real-time clock with 114 bytes of parallel NVRAM and NVRAM control. The Mouser listing likewise identifies it as a 114 x 8 NVSRAM and NVSRAM control device. These details make it relevant to legacy computer, embedded-control, industrial, and instrument designs that need timekeeping plus compact persistent storage. The device is also associated with AT-compatible clock/calendar use in the supplied search results, but the exact electrical limits and operating conditions must be taken from the manufacturer datasheet. Because the supplied data does not expose the complete electrical tables, pin names, oscillator accuracy, voltage range, current consumption, or temperature limits, those values are not inferred here. The SOIC footprint and pin count are identifiable from the distributor description, but a complete pinout cannot be responsibly generated without the manufacturer pin table. For new layouts, download the official BQ4285S datasheet and compare every power, ground, interface, and control signal before assembly. Typical implementation places the RTC beside a host bus or embedded processor, connects its backup supply or supply rails as specified by the manufacturer, and routes the parallel interface to the controlling logic. NVRAM can hold configuration values, counters, or small audit records, but its endurance and retention behavior should be verified in the datasheet rather than inferred from the memory size. The main design trade-off is the need to validate legacy interface timing and supply requirements against the exact system architecture. This page summarizes the verified distributor identity, package, clock/calendar role, and 114 x 8 NVRAM function, then separates verified facts from missing technical details. It also records that the supplied cross-reference search identifies DS14285S and DS1685SN-5+ as comparison candidates, while package, pin compatibility, and parameter matching still require datasheet-level validation before any replacement is approved.
BQ4802LYDSH - Parallel RTC with CPU Supervisor | Texas Instruments
The Texas Instruments BQ4802LYDSH is a Y2K-compliant parallel real-time clock and calendar IC with a CPU supervisor and external SRAM nonvolatile-memory backup, operating from a 3 V supply and packaged in a 28-pin SOIC with SNAPHAT socket compatibility. It combines timekeeping, calendar management, processor reset supervision, and external memory retention in one 28-SOIC device. A real-time clock, or RTC, is a clock-and-calendar integrated circuit that maintains time independently of the system processor. The broader hierarchy is RTC → clock and timing IC → timing and control semiconductor. Unlike a simple counter, this parallel-interface RTC also provides Y2K-compliant calendar functions, allowing embedded systems to preserve date information across power loss and restart operations. The BQ4802LYDSH’s principal features are its parallel real-time-clock interface, integrated CPU supervisor, external SRAM backup control, 3 V VCC operation, and 28-pin SOIC construction. Its SNAPHAT-socket-compatible arrangement distinguishes it from conventional soldered SOIC packages and supports applications requiring removable backup-battery retention. The package is identified in verified distributor data as 28-SOIC with a 0.345-inch, 8.77 mm body width. Technically, the device combines two closely related embedded-system functions. Its RTC section tracks calendar and clock information through a parallel host interface, while the CPU supervisor can assist a system in recovering from unstable power conditions. The external SRAM nonvolatile-memory control function provides a mechanism for retaining selected SRAM contents when backup power is available. Detailed timing accuracy, voltage thresholds, current consumption, and electrical limits are not present in the supplied verified dataset. Typical uses include industrial controllers, embedded instruments, data-acquisition equipment, and computer systems requiring a host-readable clock, calendar, reset supervision, and backup retention. The SNAPHAT-compatible package can also support designs in which the backup battery and socket must be serviceable. Its parallel interface is particularly appropriate for systems with a microcontroller or processor bus that can accommodate the RTC address and data signals. Designers should verify the complete pinout, electrical thresholds, backup-cell requirements, and application-specific timing behavior against the manufacturer datasheet before layout release. Care is especially important when using the external SRAM backup function because its implementation depends on the host design, retained-memory topology, and availability of backup power. The SNAPHAT socket arrangement should also be checked mechanically against the PCB footprint and battery-clearance requirements. This page consolidates verified distributor descriptions, packaging information, pricing and availability references, compatible family members, and practical selection guidance. It distinguishes verified facts from unavailable electrical details so engineers can identify what must still be confirmed in the official BQ4802LY documentation before making a production release.
BQ4802LYDW - Parallel RTC with CPU Supervisor | Texas Instruments
The Texas Instruments BQ4802LYDW is a low-power, 3 V parallel real-time clock and calendar IC with a century-based calendar, CPU supervisor, and external NVSRAM control, supplied in a 28-pin SOIC package measuring 0.295 inch, or 7.50 mm, wide. It provides time-of-day tracking for industrial control, fax, copier, and point-of-sale equipment while supervising the host processor and controlling backup power to external SRAM. A real-time clock, or RTC, is a low-power timing peripheral that retains calendar information and provides the host processor with a readable time and date. The BQ4802LYDW belongs to the clock and timing hierarchy as a parallel-interface RTC, combining timekeeping, century-based calendar management, processor supervision, and external nonvolatile SRAM backup control rather than requiring these functions as separate components. The supplied product information identifies a parallel 28-pin SOIC package and a 3 V supply configuration. Its century-based calendar is suited to systems that must maintain date information across the 2000-year boundary. The integrated CPU supervisor supports dependable restart or reset behavior after power disruption, while external NVSRAM control is intended to preserve data held in an external SRAM through a controlled backup path. Exact time accuracy, current consumption, supervisor timing, and SRAM voltage thresholds were not included in the verified web data and must be taken directly from the manufacturer datasheet. The device is designed for embedded systems requiring a dedicated wall-clock function. A host microcontroller or microprocessor can read and write time through the parallel bus, while the RTC maintains the time-of-day record. In designs using external SRAM, the NVSRAM-control function coordinates the retention path; exact capacitor values, logic levels, and supported memory arrangements require confirmation from the manufacturer documentation. Typical applications include industrial control systems, point-of-sale terminals, fax machines, and copiers. In an industrial controller, the BQ4802LYDW can preserve timestamps and calendar data even when the main processor is reset or power is interrupted. In office equipment, its Y2K-compliant calendar behavior supports reliable date reporting across century transitions. The parallel interface is especially appropriate for systems that already use a bus architecture and do not require an I2C or SPI interface. When designing a replacement, engineers should verify the exact package, pin mapping, electrical limits, supervisor behavior, and external NVSRAM connection before substitution. The verified distributor listing identifies BQ4802LYDW as a Texas Instruments parallel RTC clock/calendar in a 28-SOIC package. Confirm the official TI datasheet for pin names, absolute maximum ratings, recommended operating conditions, and application-specific circuit examples.
BQ4802LYDWG4 - Parallel RTC with CPU Supervisor | Texas Instruments
Texas Instruments BQ4802LYDWG4 is a Y2K-compliant parallel real-time clock IC with CPU supervisor and external NVSRAM control, operating from a 3 V supply in a 28-pin SOIC surface-mount package. It provides BCD-formatted calendar and time-of-day functions, a century-based calendar, and microprocessor supervision in one device. The specified operating-temperature range is 0°C to 70°C. A real-time clock is a clock-and-timing IC that maintains calendar time independently of the main processor. Within the product hierarchy, an RTC belongs to clock and timing devices, alongside oscillators, timers, and watchdogs. The BQ4802LY combines time-of-day tracking with a CPU supervisor, allowing a controller to determine whether the processor has reset and whether the system should enter a controlled recovery sequence. The device uses a parallel host interface rather than a serial I2C or SPI interface. BCD clock data supports conventional year, month, day, hour, minute, and second organization, while the century-based calendar addresses the Y2K-compliant positioning of this RTC family. Its integrated CPU supervisor reduces the number of separate reset-monitor components required in a processor-based design. External NVSRAM control is another distinguishing function. When paired with compatible nonvolatile SRAM, this control path can support retention and integrity coordination for stored data. The available package configuration is 28-pin SOIC, which is suitable for conventional surface-mount PCB assembly and industrial control systems operating across the stated 0°C to 70°C range. Typical uses include industrial controllers, point-of-sale equipment, copiers, fax machines, embedded processors, and other systems requiring calendar time plus reset supervision. Because the interface is parallel, the host must provide address and data lines and must accommodate the device's bus timing in software or hardware. Firmware should also handle rollover and validity logic rather than assuming that every read contains a valid calendar value. Designers should preserve the manufacturer's recommended bypass and interface layout, validate all read and write timing in the target system, and confirm backup-battery behavior before deployment. The parallel bus simplifies host connectivity but requires more PCB routing and pins than a serial RTC. Availability, lifecycle, exact accuracy, and current commercial pricing were not stated in the supplied records and should be confirmed with the manufacturer or an authorized distributor. This page combines the verified product description, package and operating information, source links, practical implementation guidance, and clearly identified data gaps. It also distinguishes documented device characteristics from assumptions, helping engineers make sourcing and design decisions without treating unverified electrical details as guaranteed specifications.
BQ4802LYDWR - Parallel RTC with CPU Supervisor | Texas Instruments (Tape & Reel)
The Texas Instruments BQ4802LYDWR is a low-power, 3 V parallel real-time clock and calendar IC with a century-based calendar, CPU supervisor, and external NVSRAM control, supplied in a 28-pin SOIC package measuring 0.295 inch, or 7.50 mm, wide. It provides time-of-day tracking for industrial control, fax, copier, and point-of-sale equipment while supervising the host processor and controlling backup power to external SRAM. A real-time clock, or RTC, is a low-power timing peripheral that retains calendar information and provides the host processor with a readable time and date. The BQ4802LYDWR belongs to the clock and timing hierarchy as a parallel-interface RTC, combining timekeeping, century-based calendar management, processor supervision, and external nonvolatile SRAM backup control rather than requiring these functions as separate components. The supplied product information identifies a parallel 28-pin SOIC package and a 3 V supply configuration. Its century-based calendar is suited to systems that must maintain date information across the 2000-year boundary. The integrated CPU supervisor supports dependable restart or reset behavior after power disruption, while external NVSRAM control is intended to preserve data held in an external SRAM through a controlled backup path. Exact time accuracy, current consumption, supervisor timing, and SRAM voltage thresholds were not included in the verified web data and must be taken directly from the manufacturer datasheet. The device is designed for embedded systems requiring a dedicated wall-clock function. A host microcontroller or microprocessor can read and write time through the parallel bus, while the RTC maintains the time-of-day record. In designs using external SRAM, the NVSRAM-control function coordinates the retention path; exact capacitor values, logic levels, and supported memory arrangements require confirmation from the manufacturer documentation. Typical applications include industrial control systems, point-of-sale terminals, fax machines, and copiers. In an industrial controller, the BQ4802LYDWR can preserve timestamps and calendar data even when the main processor is reset or power is interrupted. In office equipment, its Y2K-compliant calendar behavior supports reliable date reporting across century transitions. The parallel interface is especially appropriate for systems that already use a bus architecture and do not require an I2C or SPI interface. When designing a replacement, engineers should verify the exact package, pin mapping, electrical limits, supervisor behavior, and external NVSRAM connection before substitution. The verified distributor listing identifies BQ4802LYDWR as a Texas Instruments parallel RTC clock/calendar in a 28-SOIC package. Confirm the official TI datasheet for pin names, absolute maximum ratings, recommended operating conditions, and application-specific circuit examples.
BQ4802LYDWRG4 - Parallel RTC with CPU Supervisor | Texas Instruments
Texas Instruments BQ4802LYDWRG4 is a low-power parallel real-time clock (RTC) with integrated CPU supervisor, time-of-day clock, century-based calendar, and 28-pin SOIC package. It operates from a 3.3 V supply and uses a 0.032 MHz clock, with the device presented in distributor listings as a 28-terminal commercial-grade component. The BQ4802LYDWRG4 is designed for systems that need persistent timekeeping, calendar tracking, and processor monitoring in the same peripheral device. A real-time clock is a clock-and-timing semiconductor that maintains time independently of the host processor. The BQ4802LYDWRG4 belongs to the RTC and clock-and-timing IC category, where it combines a time-of-day clock, century-based calendar, and CPU supervisor functions. This integration reduces the number of separate system timing and reset components required in embedded equipment. The manufacturer identifies fax machines, copiers, industrial control systems, and point-of-sale equipment as suitable application areas. The parallel interface provides direct connection to a processor bus, while the RTC format uses BCD and supports a YY-MM-DD-dd date representation according to the retrieved technical data. The integrated CPU supervisor adds system-monitoring value, making the device useful where an external reset, power-fail, or processor supervision function is needed alongside accurate calendar time. Its 28-pin SOIC package is identified by DigiKey as 28-SOIC with a 0.295 inch, 7.50 mm width. The BQ4802LYDWRG4 is differentiated by combining multiple clock-and-timing functions in a single low-power peripheral. The manufacturer describes the bq4802Y and bq4802LY family as low-power microprocessor peripherals, while the available distributor listings identify the target as a parallel RTC clock/calendar with CPU supervisor capability. Exact operating-temperature, voltage tolerance, current, and battery-backup details are not included in the supplied source data and should be confirmed in the manufacturer datasheet before design release. Typical designs place the RTC beside the host processor so that the processor can read and write calendar data over the parallel bus. The device can support time-stamped records in industrial controllers, transaction logging in point-of-sale systems, scheduling functions in office equipment, and monitoring behavior in embedded control systems. Battery-backed operation, where required by the target architecture, must be implemented according to the manufacturer’s recommended backup and power-fail circuitry. Designers should verify the package pinout and the bq48SH-28x6 backup-module requirements for designs using the SNAPHAT option before layout release. The target ordered part is the SOIC package variant, so the footprint and pin numbering must be matched to the 28-SOIC drawing rather than the TSSOP or SNAPHAT configurations. Decoupling, battery-connection, and supervisor-reset layout should follow the manufacturer datasheet to avoid clock, reset, or power-fail integration errors. This product page consolidates the verified manufacturer product-page description, distributor package and interface information, source timestamps, same-package replacement candidates, and practical selection guidance. It distinguishes documented parameters from unavailable details, helping engineers identify whether the BQ4802LYDWRG4 is suitable for a parallel RTC design before requesting a detailed quote or beginning PCB layout.
BQ4802LYPWG4 - Y2K Parallel RTC with CPU Supervisor | TI | TSSOP-28
The Texas Instruments BQ4802LYPWG4 is a Y2K-compliant parallel-interface real-time clock (RTC) with an integrated CPU supervisor, providing time-of-day and century-based calendar tracking with alarm, daylight-savings and leap-year correction in a 28-pin TSSOP (PW) package operated from a 3 V supply. The on-chip 32.768 kHz timebase (0.032 MHz), external NVSRAM control, and integrated supply-voltage comparator make it a self-contained timing and supervisory block for embedded processors. A real-time clock is a low-power microprocessor peripheral that keeps track of wall-clock time independently of the main processor, so the system retains date and time across power loss, reset, or firmware stalls. The BQ4802LY sits at the bottom of the timing hierarchy as a battery-backed or supercapacitor-backed timekeeping IC, above simple dividers and below networked time servers. Parallel-interface RTCs such as this one trade bus speed for simplicity and low cost, using a straightforward address/data bus that maps directly onto legacy processor and industrial control buses. Key features of the bq4802Y/bq4802LY family include a century-based calendar that remains valid well past 2000, a programmable alarm with interrupt output, automatic leap-year and daylight-savings adjustment, a watchdog timer, and a CPU reset supervisor that monitors the supply rail. The temperature-compensated internal reference and comparator detect out-of-tolerance supply conditions, generating an interrupt warning before issuing a microprocessor reset, which gives the host firmware a chance to save critical data. External NVSRAM control lets the same chip manage a battery-backed static RAM used to hold configuration and audit records. Architecturally the device combines a 32.768 kHz crystal oscillator, a divider chain that produces the 1 Hz time-of-day base, binary-coded-decimal calendar counters, and a parallel host interface with chip-select and interrupt lines. Because timekeeping runs from the crystal and the counters are latched, the register set can be read atomically, avoiding rollover races that occur when software polls a free-running time counter. The LY variant adds the external NVSRAM interface that the earlier bq4802Y lacks. Typical applications include fax machines, copiers, industrial control systems, point-of-sale terminals, data loggers, and instrument panels where date-stamped records and orderly power-fail handling are required. The same supervisor and alarm functions also suit embedded appliances and metering equipment that must timestamp events. Designers should note that the 3 V supply must be backed by a coin cell or supercapacitor if timekeeping must survive power loss, and that decoupling capacitors should sit close to the VCC and GND pins. Crystal load-capacitance values should follow the manufacturer guidance for the selected crystal to avoid frequency drift. This page consolidates distributor availability, verified family cross-references, and practical design guidance for the BQ4802LYPWG4, information that is normally spread across the datasheet, the family product page, and distributor listings.
BQ4802LYPWR - Parallel RTC with CPU Supervisor | Texas Instruments
Texas Instruments BQ4802LYPWR is a low-power parallel-interface real-time clock and calendar with an integrated CPU supervisor, supplied in a 28-pin TSSOP package. It combines time-of-day tracking, a century-based calendar, supply-voltage monitoring, interrupt warning, and microprocessor reset functions. The device is designed for embedded systems that need dependable timekeeping and coordinated power supervision without relying on a host microcontroller for calendar updates. A real-time clock is a clock-and-timing IC that maintains elapsed time and calendar information independently of the main processor. This independence allows a fax machine, copier, industrial controller, point-of-sale terminal, or other embedded system to preserve time across power interruptions. The BQ4802LY family combines the RTC function with a CPU supervisor, placing timekeeping and supply-condition supervision in one package. Key features include parallel host communication, a century-based calendar, a temperature-compensated reference and comparator circuit for supply monitoring, and an interrupt warning generated before reset. According to the Texas Instruments product page, an out-of-tolerance supply condition causes the device to issue an interrupt warning and subsequently trigger a microprocessor reset. Its 28-pin TSSOP package also measures 0.173 inch, or 4.40 mm, in body width. The BQ4802LY is implemented as a low-power microprocessor peripheral rather than as a general-purpose communication controller. Its parallel interface provides a direct connection to a processor bus, while the internal clock and calendar maintain time independently. The integrated supervisor simplifies power-fail handling by giving the host advance warning before reset. Exact operating voltage, current, oscillator, and timing limits must be confirmed from the manufacturer datasheet before final design release. Typical applications include fax machines, copiers, industrial control systems, and point-of-sale equipment. It can also support data acquisition, embedded instrumentation, and communication equipment requiring a calendar-aware time source and a coordinated reset path. The TI product page specifically identifies the BQ4802Y and BQ4802LY families as suitable for these machine, control, and transaction-oriented systems. Designers should account for the complete 28-pin footprint and verify the selected BQ4802LY package variant against the schematic. Battery-backup implementation, quartz crystal selection, supply thresholds, reset timing, and decoupling require values from the manufacturer datasheet because they were not included in the supplied verified data. PCB signal integrity and clock layout should likewise follow the relevant application guidance. This page combines the verified manufacturer description, distributor availability information, package details, and explicit data-gap disclosures. It also identifies only drop-in alternatives supported by the supplied cross-reference evidence, avoiding unsupported cross-brand substitutions and distinguishing confirmed compatibility from options that require redesign.
BQ4802YDSH - Parallel RTC with CPU Supervisor | Texas Instruments
The Texas Instruments BQ4802YDSH is a Y2K-compliant parallel real-time clock with CPU supervisor, watchdog, alarm, and external SRAM nonvolatile-memory backup functions. It uses a 5 V supply, provides a 16-byte clock/calendar interface, and is packaged as a 28-pin SOIC. The device also supports SNAPHAT sockets for backup-battery attachment. A real-time clock is a clock-and-timing IC that maintains calendar information independently of the system processor. The BQ4802YDSH sits in the system timing hierarchy as a parallel RTC beneath the processor bus and above the backup-battery and SRAM subsystem. Its calendar and supervision functions are useful in industrial controllers, embedded systems, test equipment, data loggers, and systems requiring time stamps or reliable nonvolatile state. The supplied product information identifies the BQ4802Y, Y2K-compliant parallel RTC with CPU supervisor and external NVSRAM control. Listed features include alarm, daylight-saving time, leap-year handling, a supervisor, and a watchdog timer. The package is identified as 28-SOIC, with a width of 0.345 inch and a stated width of 8.77 mm in distributor listings. The Y designation and DSH package suffix are retained exactly as supplied. The parallel interface is intended for systems that can accommodate the RTC's 28-pin arrangement and provide the required control signals. Because the supplied excerpts do not include the complete timing table, electrical limits, register map, or absolute maximum ratings, those parameters remain to be confirmed from the manufacturer datasheet before release to production. Typical design use includes supervising a processor reset line, timestamping events, scheduling alarms, preserving external SRAM contents during a power interruption, and coordinating watchdog activity. The CPU supervisor and watchdog functions are particularly useful when a controller must recover predictably after brownout or firmware lockup conditions. For layout, place the device close to the processor and backup circuitry while preserving the package pin arrangement and decoupling path specified by the manufacturer. Verify oscillator, backup-battery, reset, and SRAM interfaces against the complete datasheet; the available search excerpts do not provide every electrical value required for a production schematic. This page consolidates the supplied distributor metadata, package information, and application context. It also distinguishes verified facts from parameters that still require datasheet confirmation rather than filling gaps with guessed values.
BQ4802YDW - 5V Parallel RTC with Supervisor | TI
The Texas Instruments BQ4802YDW is a 5 V parallel real-time clock and calendar IC with CPU supervisor in a 28-pin SOIC package. It counts seconds through centuries in BCD format, supports time-of-day and calendar functions, and includes an on-chip battery-backup switchover circuit with nonvolatile control for external SRAM. According to the verified Texas Instruments product-page description, the bq4802Y is intended as a low-power microprocessor peripheral for systems requiring dependable timekeeping and power supervision. A real-time clock is a specialized digital integrated circuit that maintains time independently of the system processor. The RTC category includes clock-and-calendar devices, calendar ICs, and real-time clock modules; within the broader semiconductor hierarchy, these devices support embedded control, data logging, industrial timing, and power-management functions. The BQ4802YDW combines this timekeeping role with a CPU supervisor, reducing the number of separate components needed in a system that must monitor supply voltage or reset the processor during a power event. The verified feature summary identifies 5 V operation for the bq4802Y version, century-based counting in BCD, battery-backup switchover, nonvolatile control for external SRAM, and less than 500 nA clock operating current in backup mode. The 28-SOIC package measures 0.295 inches, or 7.50 mm, in width according to the distributor listing. The parallel interface is intended to connect the RTC to a microprocessor bus, while the supervisor function supports system-reset and power-monitoring designs. The BQ4802Y family is identified by Texas Instruments as suitable for fax machines, copiers, industrial control systems, and point-of-sale equipment. Those applications commonly require calendar-level timekeeping, event logging, scheduled operation, and correct behavior after main power removal. Because the verified material does not provide complete electrical timing, accuracy, temperature, or pin-level values, those parameters remain explicitly marked as data-needed rather than inferred. Designers should follow the manufacturer datasheet for pin assignments, recommended backup-cell connection, decoupling, interface timing, and supervisor thresholds. Care should be taken to preserve the parallel-bus signal integrity and to validate battery switchover behavior across the complete system power profile. The low backup current is particularly relevant when the design spends substantial time operating from a primary cell or backup source. This page consolidates verified distributor and manufacturer information, separates known BQ4802YDW facts from missing datasheet parameters, and explains replacement and sourcing constraints. Because the supplied cross-reference results do not establish a verified drop-in equivalent with complete pin and parameter data, no substitute is asserted as electrically and mechanically interchangeable.