BQ4802YPWG4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Real-time clock IC with 16-byte battery-backed SRAM, 8-bit parallel interface, and 32.768 kHz oscillator for accurate timekeeping. Supports interrupt output, direct-address bus access, and operates in a 28-pin TSSOP package. Available from Texas Instruments with worldwide distribution.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 28
- Lifecycle
- OBSOLETE
- Datasheet
- BQ4802YPWG4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of BQ4802YPWG4?
- Real-time clock with 16 bytes battery-backed SRAM retains time and data through power interruptions without external NVRAM
- 8-bit parallel direct-address interface at up to 32 kHz clock allows straightforward integration with microcontrollers and legacy bus architectures
- Interrupt output capability enables alarm-triggered wake-up, reducing microcontroller active time and system power consumption
- 28-pin TSSOP (0.25-inch pitch) plastic package provides compact footprint suitable for space-constrained embedded boards
What is BQ4802YPWG4 used for?
BQ4802YPWG4 is designed for embedded systems that require persistent timekeeping across power cycles, such as industrial controllers, medical instruments, and data loggers. The parallel bus interface allows direct memory-mapped access from 8-bit microcontrollers and DSPs without additional serial protocol overhead. The integrated battery-backed SRAM also stores small configuration tables or calibration constants that must survive main-supply interruptions.
What are the specifications of BQ4802YPWG4?
| YTEOL | 0 |
| Clock Frequency-Max | 0.032MHz |
| External Data Bus Width | 8 |
| Information Access Method | PARALLEL, DIRECT ADDRESS |
| Interrupt Capability | Y |
| JESD-30 Code | R-PDSO-G28 |
| JESD-609 Code | e4 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | TSSOP28,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, THIN PROFILE, SHRINK PITCH |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Current-Max | 9mA |
| Supply Voltage-Max | 5.5V |
| Supply Voltage-Min | 4.5V |
| Supply Voltage-Nom | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 0.65mm |
| Terminal Position | DUAL |
| Time-Min | SECONDS |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Volatile | NO |
| uPs/uCs/Peripheral ICs Type | TIMER, REAL TIME CLOCK |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the BQ4802YPWG4 datasheet?
BQ4802YPWG4 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for BQ4802YPWG4?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How much non-volatile storage does BQ4802YPWG4 provide alongside its real-time clock function?
BQ4802YPWG4 integrates 16 bytes of battery-backed SRAM that retains data and timekeeping registers when main power is removed. While modest, these 16 bytes are sufficient to hold alarm registers, calibration offsets, and small configuration parameters in embedded systems such as industrial PLCs or medical diagnostic devices without an external EEPROM.
What interface bus does BQ4802YPWG4 use and how does it connect to a typical 8-bit microcontroller?
BQ4802YPWG4 uses an 8-bit parallel direct-address bus, making it compatible with microcontrollers that feature an external memory bus or GPIO-emulated parallel interface. The device is accessed like static RAM with separate address and data lines, operating at up to 32 kHz, which simplifies firmware since no serial protocol stack is required and register reads take a single bus cycle.
In a data-logger design, how does the interrupt output of BQ4802YPWG4 reduce system power consumption?
The interrupt output of BQ4802YPWG4 can be programmed to fire at periodic intervals or specific alarm times, allowing the host microcontroller to remain in deep-sleep mode between logging events. Rather than polling a software timer at 1-second intervals, the host wakes only on the RTC interrupt, which can extend battery life by orders of magnitude in systems sampling at 1-minute or longer intervals.
How does the 28-pin TSSOP package of BQ4802YPWG4 compare in board area to DIP alternatives for a compact embedded design?
The 28-pin TSSOP package (R-PDSO-G28, 0.25-inch lead pitch) occupies roughly 173 mm² compared to over 900 mm² for an equivalent 28-pin DIP package, making it more than 5× smaller in footprint. This compactness suits designs where PCB real estate is at a premium, such as handheld instruments, single-board computers, and medical wearables requiring integrated timekeeping.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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