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BH67F5372A - 24-Bit ADC LCD Flash MCU | Holtek Semiconductor
BH67F5372A

BH67F5372A - 24-Bit ADC LCD Flash MCU | Holtek Semiconductor

The Holtek Semiconductor BH67F5372A is a 24-bit Delta-Sigma A/D LCD Flash microcontroller built on an 8-bit high-performance RISC architecture, packaged in an LQFP-64 housing. It integrates a multi-channel 12-bit A/D converter, an analog comparator, a 24-bit Delta-Sigma A/D converter with programmable gain amplifier, a built-in LCD driver, and flexible Timer Modules supporting timing, pulse generation, and PWM functions. The integrated 24-bit Delta-Sigma ADC is designed for high-precision differential measurement of low-frequency analog signals. What is an A/D Flash MCU? An A/D Flash microcontroller (MCU) is a single-chip microcontroller that combines Flash program memory (re-programmable in-circuit) with high-resolution analog-to-digital conversion peripherals. The Flash program memory enables in-system firmware updates, while the integrated A/D converter allows the MCU to directly digitize analog sensor signals without an external ADC chip. The BH67F5372A belongs to the microcontroller product family, within the broader category of microcontrollers -> microprocessors -> integrated circuits -> semiconductors. Its 24-bit Delta-Sigma ADC provides effective number of bits (ENOB) suitable for precision weighing scales, blood pressure monitors, and industrial measurement instruments that interface directly to analog signals and require an LCD display. Key features of the BH67F5372A include 24-bit Delta-Sigma A/D converter with integrated programmable gain amplifier (PGA), a separate multi-channel 12-bit SAR A/D converter, an integrated LCD driver for direct glass connection, abundant I/O for key scanning and segment expansion, and Flash program memory supporting in-system programming (ISP). Multiple flexible Timer Modules provide timing, pulse generation, and PWM generation functions. Communication peripherals include interfaces for host and external (UART, I2C, SPI typically available on this Holtek family). The BH67F5372A uses Holtek's 8-bit high-performance RISC core with a Harvard architecture, enabling single-cycle instruction execution at typical oscillator speeds. The wide operating voltage and integrated analog front-end (PGA + 24-bit Delta-Sigma ADC) eliminate the need for external signal conditioning, reducing BOM cost and PCB area. The on-chip LCD driver supports a wide range of LCD panel configurations through internal bias generation and software-controlled segment mapping, simplifying the design of battery-powered instruments with display readouts. Typical applications include electronic weighing scales, body composition analyzers, blood pressure monitors, medical measurement instruments, industrial process sensors, and consumer health devices. The combination of high-resolution ADC and LCD driver makes it a single-chip solution for portable battery-powered instruments. When designing with this MCU, pay attention to the analog front-end grounding: separate analog and digital ground planes with a single-point connection near the MCU's AVSS/AVDD pins is critical to achieve the full 24-bit ENOB performance. The integrated PGA gain settings must be matched to the sensor output range to maximize dynamic range. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. We cross-reference same-brand LQFP-64 variants of the BH67F5372A family and Holtek's sister MCU BH67F5362A for designers evaluating pin-compatible alternatives.

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BQ32000DR - Serial RTC with Battery Backup, I2C, 8-SOIC | Texas Instruments
BQ32000DR

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.

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BQ4285EP - 114B RTC With NVRAM Control | Texas Instruments
BQ4285EP

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.

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BQ4285LS - 114x8 NVRAM RTC, 3V | Texas Instruments
BQ4285LS

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.

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BQ4285P-SB2 - 114x8 NVSRAM RTC Clock/Calendar | TI
BQ4285P-SB2

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.

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BQ4285S-SB2 RTC with 114x8 NVRAM | Texas Instruments
BQ4285S-SB2

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.

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BQ4285S-SB2G4 - Real-Time Clock with NVRAM Control | TI
BQ4285S-SB2G4

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.

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BQ4285S-SB2TR RTC with 114x8 NVRAM | Texas Instruments (Tape & Reel)
BQ4285S-SB2TR

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.

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BQ4802LYDSH - Parallel RTC with CPU Supervisor | Texas Instruments
BQ4802LYDSH

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.

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BQ4802LYDW - Parallel RTC with CPU Supervisor | Texas Instruments
BQ4802LYDW

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.

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BQ4802LYDWG4 - Parallel RTC with CPU Supervisor | Texas Instruments
BQ4802LYDWG4

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.

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BQ4802LYDWR - Parallel RTC with CPU Supervisor | Texas Instruments (Tape & Reel)
BQ4802LYDWR

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.

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BQ4802LYDWRG4 - Parallel RTC with CPU Supervisor | Texas Instruments
BQ4802LYDWRG4

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.

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BQ4802LYPW - 3.3V Parallel RTC with CPU Supervisor | Texas Instruments
BQ4802LYPW

BQ4802LYPW - 3.3V Parallel RTC with CPU Supervisor | Texas Instruments

The Texas Instruments BQ4802LYPW is a 3.3 V parallel real-time clock and calendar with CPU supervisor in a 28-pin TSSOP package. It combines a century-based time-of-day clock, BCD calendar, voltage monitoring, and nonvolatile control for external SRAM. Backup-mode clock operation current is less than 500 nA, supporting low-power systems that must retain time across supply interruptions. The device is specified for operation from 0 °C to 70 °C and is supplied in the PW 28-pin TSSOP package. A real-time clock is a specialized timing peripheral used by embedded processors and control systems to maintain calendar time independently of the main CPU. The BQ4802LY belongs to the parallel RTC hierarchy, combining clock-and-calendar functions with CPU-supervision features. This integration reduces the need for separate timekeeping and power-fail monitoring components while providing a defined interface for an external nonvolatile SRAM backup path. Key features include a century-based BCD calendar, operation from a 3.3 V supply, an on-chip battery-backup switchover circuit, and nonvolatile control for external SRAM. The supply supervisor detects an out-of-tolerance condition, generates an interrupt warning, and can subsequently issue a microprocessor reset. Its less-than-500 nA backup clock current is particularly useful where maintaining accurate time during long power interruptions is more important than operating from the primary supply continuously. Technically, the BQ4802LY combines a temperature-compensated reference and comparator with its RTC and supervisor functions. The parallel interface exposes calendar and clock data to a host processor while the supervisor provides warning and reset behavior during power transitions. Battery backup preserves RTC operation when the primary supply falls away, allowing the system to resume with valid time information and protect selected external SRAM contents through the documented nonvolatile-control mechanism. Typical applications include fax machines, copiers, industrial control systems, point-of-sale equipment, embedded instruments, and other microprocessor-based products that require calendar time and orderly power-fail handling. Its 3.3 V operating supply is appropriate for systems designed around modern low-voltage embedded logic. Design efforts should include correct battery connection, decoupling, supervisor-reset integration, and validation of backup and recovery behavior. In practice, the BQ4802LYPW is most useful where accurate time retention and power-fail notification matter more than a minimal RTC footprint. The 28-pin TSSOP package simplifies assembly in conventional surface-mount production, although engineers should verify every signal against the manufacturer pinout and application guidance. This page combines verified manufacturer and distributor information, parameter-gap markers, family comparisons, and practical design considerations to support component selection.

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BQ4802LYPWG4 - Y2K Parallel RTC with CPU Supervisor | TI | TSSOP-28
BQ4802LYPWG4

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.

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BQ4802LYPWR - Parallel RTC with CPU Supervisor | Texas Instruments
BQ4802LYPWR

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.

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BQ4802YDSH - Parallel RTC with CPU Supervisor | Texas Instruments
BQ4802YDSH

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.

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BQ4802YDW - 5V Parallel RTC with Supervisor | TI
BQ4802YDW

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.

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BQ4802YDWG4 - Parallel RTC with CPU Supervisor | Texas Instruments
BQ4802YDWG4

BQ4802YDWG4 - Parallel RTC with CPU Supervisor | Texas Instruments

The Texas Instruments BQ4802YDWG4 is a Y2K-compliant parallel real-time clock with a CPU supervisor and external NVSRAM control, operating from a 5 V supply in a 28-pin SOIC package. It provides time-of-day tracking, century-based calendar functions, BCD-formatted clock data, and a parallel microprocessor interface. The verified product data identifies a 28-SOIC package measuring 0.295 inches, or 7.50 mm, in width, with surface-mount construction. A real-time clock is a Clock & Timing integrated circuit that maintains calendar time independently of the host processor. The BQ4802Y family combines the RTC function with CPU supervision and external nonvolatile SRAM control, allowing a system to detect power interruptions and preserve critical state when the primary supply fails. This integration is useful in industrial controllers, embedded systems, data-acquisition equipment, and other designs that require reliable wall-clock time plus power-failure control. The BQ4802YDWG4 uses a parallel interface and BCD clock format, as shown in the verified distributor and datasheet listings. Its Y2K-compliant design provides century-based calendar information, while the CPU supervisor supports system monitoring and reset-related control functions. External NVSRAM control is an important distinction from basic RTC-only devices because the IC can coordinate backup or nonvolatile memory behavior during power transitions. Exact operating voltage limits, current consumption, oscillator accuracy, temperature range, and supervisor timing values were not supplied in the verified data and require confirmation from the manufacturer datasheet. Typical implementation places the BQ4802YDWG4 beside the host processor, backup battery, external NVSRAM, and system reset circuitry. The parallel bus allows the processor to read calendar and time registers during normal operation, while the supervisor provides a hardware path for power-failure detection. Designers should verify signal levels, battery backup behavior, reset timing, and NVSRAM interface requirements against the complete Texas Instruments datasheet before production release. Because the part is a clock-and-timing IC rather than a power semiconductor, SOA data is not applicable. For BQ4802YDWG4 sourcing, compare authorized inventory, package variant, datasheet availability, and lifecycle status rather than relying only on a generic cross-reference result. The verified listing from Heisener reported 3,520 pieces at a reference unit price of $7.8255, while Rochester Electronics reported the part in stock; these figures are distributor observations rather than a universal market price.

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BQ4802YDWR - 5V Parallel RTC with Supervisor | TI (Tape & Reel)
BQ4802YDWR

BQ4802YDWR - 5V Parallel RTC with Supervisor | TI (Tape & Reel)

The Texas Instruments BQ4802YDWR 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 BQ4802YDWR 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 BQ4802YDWR 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.

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BQ4802YDWRG4 - Y2K Parallel RTC with CPU Supervisor | TI
BQ4802YDWRG4

BQ4802YDWRG4 - Y2K Parallel RTC with CPU Supervisor | TI

The Texas Instruments BQ4802YDWRG4 is a Y2K-compliant parallel real-time clock and calendar integrated circuit with CPU supervisor functions, supplied in a 28-pin SOIC package. It combines a century-based time-of-day clock, a calendar, voltage monitoring, processor reset generation, and external nonvolatile SRAM control for industrial and embedded control systems. The verified distributor listing identifies the device as IC RTC CLK/CALENDAR PAR 28-SOIC, and the manufacturer describes the BQ4802Y as a low-power microprocessor peripheral intended for fax machines, copiers, industrial controls, point-of-sale equipment, and other embedded systems. The BQ4802Y family monitors its supply voltage with a temperature-compensated reference and comparator, generating an interrupt warning and then a microprocessor reset when the supply becomes out of tolerance. The parallel interface allows a host processor to read and write the RTC through address and data lines rather than a serial bus. This makes the device useful in systems where the host already has a parallel bus but lacks a dedicated wall-clock timebase. The century-based calendar addresses year-2000-related date rollover concerns in systems that must retain a full date across power loss or long service intervals. The CPU supervisor function adds system-reset and warning capability, allowing firmware to respond before an out-of-tolerance supply causes an uncontrolled reset. External nonvolatile SRAM control is another distinguishing feature. Systems using battery-backed SRAM can place the RTC and memory-control functions under one coordinating controller rather than implementing separate timekeeping and retention supervision. The integration reduces the number of discrete functions required, although the battery backup, crystal connection, supply bypassing, and supervisor reset behavior still require careful design review. The verified BQ4802YDWRG4 listings specify a 28-pin SOIC measuring 0.295 inch, or 7.50 mm, in width. Heisener reports 5,376 pieces in stock and a unit price of $4.5050 as of 2026-10-28, while LCSC lists the part from $2.2824. Lead time on the Heisener listing is marked to be confirmed, so production schedules should not rely on the stated May 16 to May 21 estimated delivery window. This page distinguishes the BQ4802Y from the lower-voltage BQ4802L family, identifies verified same-package options for design review, and summarizes application, sourcing, and replacement considerations beyond a distributor stock listing. Because the retrieved data does not include a complete manufacturer pin table, electrical limits, or a manufacturer cross-reference list, unavailable parameters are explicitly marked as DATA_NEEDED rather than inferred.

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BQ4802YPW - Parallel RTC with CPU Supervisor | Texas Instruments
BQ4802YPW

BQ4802YPW - Parallel RTC with CPU Supervisor | Texas Instruments

The Texas Instruments BQ4802YPW is a Y2K-compliant parallel real-time clock with CPU supervisor and external nonvolatile SRAM control, packaged in a 28-pin TSSOP. It combines a time-of-day clock, century-based calendar, and microprocessor supervisory functions in one low-power timing peripheral. The verified distributor description identifies the device as a parallel RTC clock/calendar IC and confirms its 28-pin TSSOP package. A real-time clock is a clock-and-timing IC that maintains time independently of the system processor. The BQ4802YPW belongs to the RTC, clock/calendar, timekeeping, and clock-and-timing hierarchy. Its century-based calendar and external SRAM backup-control capability make it useful in systems that require retained system time or controlled preservation of processor memory during power transitions. The integrated CPU supervisor adds another layer of power-management functionality around a clock peripheral. The main verified features are Y2K-compliant calendar operation, parallel timekeeping, a CPU supervisor, external nonvolatile SRAM control, 5 V VCC operation as identified in the available technical description, and a 28-pin TSSOP package. These features distinguish it from basic RTC devices that provide only seconds, minutes, hours, and date registers. The TSSOP package is intended for compact surface-mount PCB designs, while the parallel interface simplifies connection to compatible microprocessor or embedded-controller buses. The BQ4802YPW is positioned for embedded systems, industrial controllers, data-acquisition equipment, test and measurement systems, and other microprocessor-based products where accurate timekeeping and supervised power transitions are useful. A system designer should verify the exact bus timing, reset behavior, SRAM-control requirements, and electrical limits in the manufacturer datasheet before finalizing a design. The provided search data confirms the product identity and broad functionality but does not provide a complete manufacturer datasheet specification set. The key design consideration is validating the relationship between the RTC, CPU supervisor, and external SRAM backup circuitry. If the system uses battery-backed SRAM, power sequencing and supply rails must be checked against the device's required operating conditions. As with any compact mixed-signal timing IC, PCB layout should preserve clean supply paths and follow the manufacturer's recommended decoupling and pin-routing guidance. This page consolidates verified distributor identification, product classification, package information, and practical sourcing guidance. It also separates confirmed facts from missing electrical details so engineers can make an informed preliminary selection without assuming unverified ratings, prices, or lifecycle claims.

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BQ4802YPWR - Parallel RTC with CPU Supervisor | Texas Instruments (Tape & Reel)
BQ4802YPWR

BQ4802YPWR - Parallel RTC with CPU Supervisor | Texas Instruments (Tape & Reel)

The Texas Instruments BQ4802YPWR is a Y2K-compliant parallel real-time clock with CPU supervisor and external nonvolatile SRAM control, packaged in a 28-pin TSSOP. It combines a time-of-day clock, century-based calendar, and microprocessor supervisory functions in one low-power timing peripheral. The verified distributor description identifies the device as a parallel RTC clock/calendar IC and confirms its 28-pin TSSOP package. A real-time clock is a clock-and-timing IC that maintains time independently of the system processor. The BQ4802YPWR belongs to the RTC, clock/calendar, timekeeping, and clock-and-timing hierarchy. Its century-based calendar and external SRAM backup-control capability make it useful in systems that require retained system time or controlled preservation of processor memory during power transitions. The integrated CPU supervisor adds another layer of power-management functionality around a clock peripheral. The main verified features are Y2K-compliant calendar operation, parallel timekeeping, a CPU supervisor, external nonvolatile SRAM control, 5 V VCC operation as identified in the available technical description, and a 28-pin TSSOP package. These features distinguish it from basic RTC devices that provide only seconds, minutes, hours, and date registers. The TSSOP package is intended for compact surface-mount PCB designs, while the parallel interface simplifies connection to compatible microprocessor or embedded-controller buses. The BQ4802YPWR is positioned for embedded systems, industrial controllers, data-acquisition equipment, test and measurement systems, and other microprocessor-based products where accurate timekeeping and supervised power transitions are useful. A system designer should verify the exact bus timing, reset behavior, SRAM-control requirements, and electrical limits in the manufacturer datasheet before finalizing a design. The provided search data confirms the product identity and broad functionality but does not provide a complete manufacturer datasheet specification set. The key design consideration is validating the relationship between the RTC, CPU supervisor, and external SRAM backup circuitry. If the system uses battery-backed SRAM, power sequencing and supply rails must be checked against the device's required operating conditions. As with any compact mixed-signal timing IC, PCB layout should preserve clean supply paths and follow the manufacturer's recommended decoupling and pin-routing guidance. This page consolidates verified distributor identification, product classification, package information, and practical sourcing guidance. It also separates confirmed facts from missing electrical details so engineers can make an informed preliminary selection without assuming unverified ratings, prices, or lifecycle claims.

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BQ4802YPWRG4 - Parallel RTC with CPU Supervisor | TI
BQ4802YPWRG4

BQ4802YPWRG4 - Parallel RTC with CPU Supervisor | TI

The Texas Instruments BQ4802YPWRG4 is a parallel real-time clock and calendar IC with CPU supervisor, watchdog timer, alarm, daylight-saving, and leap-year functions. It operates from a 5 V supply, supports a maximum clock frequency of 0.032 MHz, and is packaged in a 28-pin TSSOP measuring 0.173 inches wide and 4.40 mm wide. The BQ4802YPWRG4 also provides interrupt capability and external NVSRAM control. A real-time clock, or RTC, is a clock and timing semiconductor that maintains time-of-day and calendar information independently of the main processor. In the broader hierarchy, an RTC is a clock and timing IC, followed by timer and real-time-clock ICs. Integrating a CPU supervisor with an RTC allows a system to retain calendar information while also monitoring a supply rail and recovering a processor or other circuit when voltage falls outside acceptable limits. The BQ4802YPWRG4 combines several timing and supervisory functions in one package. Its parallel interface supports integration with processors that use a parallel bus, while the integrated clock and calendar provide year, month, day, and time-of-day tracking. The device also includes an alarm, daylight-saving capability, leap-year handling, watchdog-timer support, and external NVSRAM control, reducing the number of separate support components required in embedded equipment. The 5 V supply requirement and 0.032 MHz maximum clock frequency distinguish this device from low-voltage, serial-interface RTC families. A maximum frequency of 0.032 MHz corresponds to 32 kHz, providing a conventional timekeeping reference for the oscillator section. The operating temperature range shown by the distributor data is 0 °C to 70 °C, placing the specified grade in commercial temperature conditions. Typical uses include industrial controllers, embedded processors, data-acquisition equipment, instrument systems, and compact control products that require both continuous timekeeping and supply supervision. Its interrupt output allows a host processor to respond to scheduled events or supervisory conditions, while external NVSRAM control can coordinate retained memory with the RTC. Designers should verify oscillator characteristics, reset behavior, interface timing, interrupt polarity, and the external NVSRAM connection in the manufacturer datasheet before layout. Because the device uses a 28-pin TSSOP, adequate routing clearance and careful ground-return planning are important for reliable clock accuracy and clean supervisor operation. This page combines distributor availability, exact package information, Y2K-compliant parallel RTC positioning, and same-family alternatives with practical design guidance. It helps engineers distinguish the BQ4802YPWRG4 from timer-only ICs and from RTCs that lack the integrated CPU supervisor, watchdog, and external NVSRAM control features.

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