BQ4802YDWR - 5V Parallel RTC with Supervisor | TI (Tape & Reel)
MPN: BQ4802YDWR ✓ NakahandaBQ4802YDWR Ulas
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.
Mga alternatibo na pwedeng ilagay na BQ4802YDWR — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Variante sa Seri na ito
Katulad na modelo sa serye na katugma sa pagpasok BQ4802YDWR (parehas na form factor at footprint) — pagkakaiba sa Package, Supply Voltage, Calendar Capability, Device Type, Integrated Functions.
Wala ng magagamit na drop-in alternatibo para sa produkto na ito.
Hilingin ang AlternatiboBQ4802YDWR Mga Spesipikasyon
| Product Type | Real-time clock and calendar IC with CPU supervisor |
| Operating Voltage Variant | 5 V operation for bq4802Y |
| Timekeeping Format | BCD format |
| Calendar Capability | Counts seconds through centuries |
| Backup Mode Clock Operating Current | Less than 500 nA |
| Backup Function | On-chip battery-backup switchover circuit |
| Nonvolatile Control | Nonvolatile control for external SRAM |
| Supervisor Function | CPU supervisor |
| Interface | Parallel |
| Packhaging | 28-pin SOIC |
| Package Width | 7.50 mm (0.295 in) |
| Uri ng Pagpapasok | Surface mount |
Gabay sa Pin Configuration ng BQ4802YDWR 7.50 mm (0.295 in)
Pin configuration para sa BQ4802YDWR (7.50 mm (0.295 in) package). Ang pagnunumero ng pin, mga function, at connection diagram ay tinukoy sa datasheet ng manufacturer. Sumangguni dito para sa eksaktong footprint at mga alituntunin sa soldering.
Wala ng detalyadong pinout data na magagamit para sa BQ4802YDWR.
Sumangguni sa datasheet para sa buong pin configuration.
Tipikal na mga Gamit
BQ4802YDWR ay nararapat para sa 6 aplikasyons: Industrial Control Systems, Point-of-Sale Equipment, Fax Machines and Copiers, Embedded Data Loggers, Battery-Backed Industrial Equipment, Microprocessor Supervisory Systems.
Industrial Control Systems
BQ4802YDWR fits industrial controllers that require independent calendar time and supervisory power monitoring. The bq4802Y provides 5 V operation, parallel communication, century-based counting in BCD, and an on-chip battery-backup switchover circuit, allowing a controller to retain time-of-day information when the main supply falls away. Its less-than-500-nA backup clock current is useful for systems that spend substantial time operating from a backup source. The CPU supervisor can support orderly processor reset during power transitions, although exact thresholds, reset delay, and temperature limits must be verified in the manufacturer datasheet before production release.
Inirekomenda
Point-of-Sale Equipment
BQ4802YDWR is suitable for point-of-sale systems that need dependable transaction timestamps and controlled behavior during power interruptions. The century-based calendar and BCD timekeeping support date and time records, while the parallel interface connects the RTC to a processor bus. The battery-backup switchover helps preserve timekeeping when mains or system power is unavailable, and the sub-500-nA backup operating-current specification supports low standby drain. System integrators should still validate clock accuracy, supervisor thresholds, bus timing, and environmental requirements against the specific POS architecture.
Inirekomenda
Fax Machines and Copiers
BQ4802YDWR can support the timekeeping and power-sequencing needs of office imaging equipment. The real-time clock and century-based calendar provide a persistent date and time reference for document logs, scheduled jobs, and service records. Its CPU supervisor function is useful when an embedded controller must recover predictably after power restoration, while the battery-backup switchover protects the timekeeping function during short supply interruptions. The verified family information identifies fax machines and copiers as intended applications, but mechanism timing, backup-cell life, and production environmental limits must be validated from the complete datasheet.
Inirekomenda
Embedded Data Loggers
BQ4802YDWR is appropriate for embedded systems that must associate measurements or events with calendar time even when the host processor is reset or temporarily unpowered. The 5 V bq4802Y variant combines a parallel real-time clock, century-based calendar, and CPU supervisor in one 28-pin SOIC, reducing the number of discrete timing and reset-support devices. Backup mode clock current below 500 nA is favorable for low-power installations. Designers should define the backup-source topology, verify switchover behavior, and confirm that the RTC accuracy and environmental ratings satisfy the logger’s field requirements.
Inirekomenda
Battery-Backed Industrial Equipment
BQ4802YDWR can serve battery-backed industrial equipment requiring a persistent real-time reference and supervisory reset function. The on-chip battery-backup switchover circuit, nonvolatile control for external SRAM, and less-than-500-nA backup clock current provide a foundation for systems that must retain timekeeping during main-power loss. The parallel interface allows connection to a microprocessor-controlled supervisory architecture. Because the verified material does not provide retention time, backup-cell requirements, or power-supply limits, the battery should be selected only after reviewing the manufacturer recommendations and testing worst-case battery and temperature conditions.
Inirekomenda
Microprocessor Supervisory Systems
BQ4802YDWR is useful when an embedded system needs both timekeeping and CPU-supervision functions in a single peripheral. The RTC can maintain seconds, minutes, hours, and calendar information, while the supervisor supports power-state monitoring and reset control for the host processor. The 5 V bq4802Y version and 28-pin SOIC package fit systems designed around a parallel bus. Designers must confirm reset polarity, threshold voltage, response timing, and pin-level signal behavior from the datasheet, especially if the processor has unusual brownout or startup requirements.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for BQ4802YDWR — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto |
|---|---|
| Package | 28-pin SOIC |
| Brand | Texas Instruments |
| Product Type | Parallel real-time clock and calendar IC with CPU supervisor |
| Operating Voltage | 5 V operation for bq4802Y |
| Timekeeping Format | BCD, counts seconds through centuries |
| Backup Clock Current | Less than 500 nA in backup mode |
| Backup Support | On-chip battery-backup switchover circuit |
| Nonvolatile Support | Nonvolatile control for external SRAM |
| Supervisor | CPU supervisor integrated |
| Applications | Fax machines, copiers, industrial control systems, point-of-sale equipment |
| Lifecycle Status | Active |
| Distributor Availability | DigiKey and Mouser listings |
Pangunahing mga Pagkakaiba
- Integrated calendar timekeeping and CPU supervision (kumpara saBQ4845YS-A4TR)
- 5 V application-specific variant (kumpara saBQ4802LY)
- Backup-mode power focus (kumpara saM48T58Y-70MH1F)
Talaan ng Disenyo
Design the backup-cell and main-supply path around the manufacturer’s recommended switching topology. The verified BQ4802Y feature summary confirms an on-chip battery-backup switchover circuit and less than 500 nA clock operating current in backup mode. Do not treat the backup figure as the normal active current, and do not select the backup cell or series components without checking the datasheet’s voltage limits, leakage requirements, and transition behavior.
Place the BQ4802YDWR close to the processor’s parallel bus and route the clock, data, and control traces with short paths and controlled return paths. Keep the backup-network area away from noisy switching nodes and follow the manufacturer’s recommended decoupling arrangement. The verified record confirms a 28-pin SOIC and 7.50 mm width, but it does not provide a land pattern, so the mechanical drawing must control pad and solder-mask design.
Do not confuse BQ4802YDWR with the 3.3 V bq4802LY variant. The verified feature summary identifies bq4802Y as the 5 V version, and changing voltage variants can affect the complete system power budget. Also avoid assuming that any RTC with a 28-pin package is a drop-in replacement: pin names, supervisor polarity, calendar behavior, backup current, and interface timing must be compared before substitution.
Impormasyon ng Pagsunod sa Kautusan
The supplied manufacturer and distributor excerpts do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. Compliance values are therefore unknown rather than assumed.