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Microchip Technology AT45DB081B-RI
- Part No.:
- AT45DB081B-RI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT45DB081B-RI.pdf
- Description:
- IC FLASH 8MBIT SPI 20MHZ 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,500
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Product details
Overview
AT45DB081B-RI from Microchip Technology (formerly Atmel) is an 8-Mbit serial DataFlash memory IC with SPI interface, organized as 4096 pages × 264 bytes, featuring dual 264-byte SRAM buffers and hardware write protection. It operates from a single 2.5V–3.6V or 2.7V–3.6V supply, supports up to 20 MHz clock frequency, and enables continuous array read for code shadowing in embedded microcontroller systems.
For engineers reviewing the AT45DB081B-RI datasheet, AT45DB081B-RI pinout, AT45DB081B-RI application, or AT45DB081B-RI equivalent, key selection considerations include its page-erase flexibility, buffer-assisted streaming write capability, 5.0V-tolerant control pins, industrial temperature range support, and compatibility with legacy AT45DB081/AT45DB081A designs.
Technical Context
The AT45DB081B-RI implements a serial Flash architecture with hierarchical memory organization (pages, blocks, sectors) and two independent 264-byte SRAM buffers that enable concurrent data reception and nonvolatile programming. Its SPI interface supports Mode 0 and Mode 3, with all instructions initiated by CS falling edge followed by 8-bit opcodes and address sequences.
Internally self-timed operations include page erase (tPE), block erase (tBE), and buffer-to-main-memory program with built-in erase (tEP); status register bit 7 provides real-time RDY/BUSY indication, while bit 6 reports main memory–buffer compare results. The device requires no high-voltage programming and uses standard SPI-level signaling with 5.0V-tolerant SI, SCK, CS, RESET, and WP inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8,650,752 bits (4096 × 264-byte pages) - supports firmware storage and data logging without parallel bus overhead |
| Supply Voltage | 2.5V–3.6V or 2.7V–3.6V - single-supply operation compatible with 2.5V/3.3V logic domains |
| Max Clock Frequency | 20 MHz - enables fast sequential read/write throughput up to ~2.5 MB/s in continuous mode |
| Active Read Current | 4 mA typical - low power consumption suitable for battery-backed or energy-constrained systems |
| Standby Current | 2 µA typical - minimal quiescent draw during idle periods in always-on applications |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded deployment |
| Input Tolerance | 5.0V-tolerant SI, SCK, CS, RESET, WP - simplifies level-shifting in mixed-voltage systems |
Pinout & Package
AT45DB081B-RI is available in 28-pin TSOP-I (Type 1), 28-pin SOIC, and 24-ball CBGA packages. The -RI suffix denotes the industrial temperature grade in TSOP-I package per Microchip's ordering nomenclature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command initiation; falling edge triggers opcode loading |
| SCK | Serial Clock | Input-only clock; data latched on rising edge, output shifted on falling edge (SPI Modes 0/3) |
| SI | Serial Input | Input-only data line for opcodes, addresses, and buffer writes; 5.0V-tolerant |
| SO | Serial Output | Output-only data line for reads and status register; tri-stated when CS high |
| WP | Write Protect | Hardware lock for first 256 pages; low = protected, high = programmable; 5.0V-tolerant |
| RESET | Chip Reset | Asynchronous active-low reset of internal state machine; 5.0V-tolerant; internal POR circuit included |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output pulled high externally; driven low during erase/program/transfer operations |
| VCC / GND | Power Supply | Single 2.5V–3.6V supply rail; decoupling required per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 264-byte buffers enable simultaneous data streaming into one buffer while reprogramming the other into Flash - eliminates write latency in continuous logging |
| Continuous Array Read | Supports seamless wrap-around reads across page boundaries using opcodes 68H/E8H - ideal for XIP (execute-in-place) code shadowing from Flash to RAM |
| Page-Level Erase Flexibility | Individual page erase (81H) and 8-page block erase (50H) allow granular wear leveling and optimized update cycles for partial firmware patches |
| Hardware Write Protection | WP pin locks first 256 pages (64 KB) against accidental overwrite - critical for bootloader or calibration data retention |
| Self-Timed Operations | All program/erase commands internally timed with status register feedback - no external timing management required in host firmware |
Applications
| Firmware Storage | Data Logging |
|---|---|
Use Scenario: Storing boot code, application firmware, and configuration parameters for microcontrollers in industrial controllers. IC Role / Device Role / Timing Role: Nonvolatile serial code storage with continuous read capability enabling fast startup and XIP execution. Use Value: Eliminates need for parallel NOR Flash or external RAM buffering; reduces PCB footprint and BOM count. | Use Scenario: Capturing sensor readings, event timestamps, and diagnostic logs in remote monitoring devices with limited power. IC Role / Device Role / Timing Role: High-reliability sequential data sink with dual-buffer streaming to sustain write rates during background Flash programming. Use Value: Enables uninterrupted logging at up to 20 MHz SPI clock without data loss during page reprogramming. |
| Audio Playback Buffer | Calibration Data Archive |
Use Scenario: Holding compressed audio samples (e.g., voice prompts, alarms) in medical or home automation devices. IC Role / Device Role / Timing Role: SPI-accessed audio asset repository supporting gapless playback via continuous array read mode. Use Value: Delivers deterministic read timing and zero-gap page boundary transitions for smooth audio output. | Use Scenario: Preserving factory-trimmed sensor offsets, ADC gain coefficients, and system calibration constants across power cycles. IC Role / Device Role / Timing Role: Secure, write-protected nonvolatile storage for mission-critical calibration metadata. Use Value: Hardware WP pin prevents corruption of first 256 pages containing calibration data during field firmware updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT45DB081D-RI | Successor revision with enhanced reliability and updated endurance specs; identical pinout, timing, and command set | Same use cases; preferred for new designs requiring latest qualification and extended lifecycle support | Select AT45DB081D-RI for new designs where long-term supply assurance and updated AEC-Q200 alignment are priorities |
| W25Q80DVSSIG | 8-Mbit SPI NOR Flash (Winbond); lacks dual buffers, no continuous array read, but offers faster random access and sector-erase granularity | Better suited for random-access code execution; less optimal for streaming write-intensive logging | Choose W25Q80DVSSIG when random read performance and JEDEC-standard SPI commands outweigh buffer-assisted streaming needs |
Compared with AT45DB081B-RI, the AT45DB081D-RI offers improved data retention and program/erase endurance while maintaining full backward compatibility, whereas the W25Q80DVSSIG trades buffer-based streaming capability for broader industry-standard SPI NOR interoperability and faster random reads.
Availability
AT45DB081B-RI is available at Aetrix Electronics and suitable for firmware storage, data logging, audio playback buffering, and calibration data archiving requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for AT45DB081B-RI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology is a global semiconductor company delivering microcontrollers, analog, FPGA, and memory solutions with emphasis on reliability, longevity, and design-in support.
The AT45DB081B-RI belongs to Microchip's DataFlash family - engineered specifically for SPI-based embedded systems needing high-density serial Flash with integrated SRAM buffers to enable concurrent read/write operations without external memory management.
FAQ
What is the memory organization of the AT45DB081B-RI?
The AT45DB081B-RI contains 8,650,752 bits of Flash memory organized as 4096 pages of 264 bytes each (256 data + 8 overhead bytes). It also integrates two independent 264-byte SRAM buffers. This structure supports efficient page-level programming, block erases (8 pages), and continuous array reads across page boundaries - all accessible via standard SPI commands.
Does the AT45DB081B-RI require high-voltage programming?
No, the AT45DB081B-RI does not require high-voltage programming. It operates entirely from a single 2.5V–3.6V or 2.7V–3.6V supply for both read and program/erase operations. All internal programming voltages are generated on-chip, eliminating the need for external charge pumps or voltage translators - simplifying system design and reducing component count.
How does the RDY/BUSY pin function on the AT45DB081B-RI?
The RDY/BUSY pin on the AT45DB081B-RI is an open-drain output that is pulled low during internally self-timed operations including page/block erase, buffer-to-Flash programming, main memory–buffer transfers, and compares. It remains high otherwise. Host systems can poll this pin or use it as an interrupt source to determine when the AT45DB081B-RI is ready for the next command.
Can the AT45DB081B-RI be used for execute-in-place (XIP) code execution?
Yes, the AT45DB081B-RI supports execute-in-place (XIP) via its Continuous Array Read mode (opcodes 68H/E8H), which delivers seamless, gapless sequential reads across page boundaries. While the AT45DB081B-RI itself does not execute code, it enables microcontrollers to stream instruction code directly into cache or RAM for execution - ideal for resource-constrained embedded systems.
Is the AT45DB081B-RI pin-compatible with earlier versions like AT45DB081A?
Yes, the AT45DB081B-RI is 100% compatible with AT45DB081 and AT45DB081A in terms of pinout, command set, timing, and electrical specifications. The -RI suffix denotes industrial temperature grade in TSOP-I package, and functional equivalence is explicitly confirmed in the official datasheet - allowing drop-in replacement in existing designs without layout or firmware changes.
AT45DB081B-RI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-SOIC (0.342", 8.69mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 8Mbit
- Memory Organization:
- 264 Bytes x 4096 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 20 MHz
- Write Cycle Time - Word, Page:
- 14ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT45DB081B-RI FAQ
1.How can I place an order for AT45DB081B-RI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB081B-RI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT45DB081B-RI reliable?
The price and inventory of AT45DB081B-RI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB081B-RI is usually 5 days.
3.What payment methods are accepted for AT45DB081B-RI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB081B-RI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB081B-RI?
AT45DB081B-RI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB081B-RI order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT45DB081B-RI?
For technical support, including AT45DB081B-RI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB081B-RI requirements.
6.How does Aetrix verify that AT45DB081B-RI is sourced from the original manufacturer or authorized distributors?
All AT45DB081B-RI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT45DB081B-RI meets industry standards.
7.What is the process for return or replacement of AT45DB081B-RI?
All AT45DB081B-RI units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB081B-RI, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT45DB081B-RI part is unused and in its original packaging.
Return procedure for AT45DB081B-RI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB081B-RI Tags
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