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Microchip Technology AT45DB081B-RC-2.5
- Part No.:
- AT45DB081B-RC-2.5
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 28-SOIC (0.342", 8.69mm Width)
- Datasheet:
-
AT45DB081B-RC-2.5.pdf
- Description:
- IC FLASH 8MBIT SPI 15MHZ 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,354
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Product details
Overview
AT45DB081B-RC-2.5 from Microchip Technology (formerly Atmel) is an 8-Mbit serial DataFlash memory IC optimized for code shadowing, firmware storage, and embedded data logging. It features 4096 pages × 264 bytes (8,650,752 bits), dual 264-byte SRAM buffers, SPI interface (modes 0/3), 20 MHz max clock, and single 2.5V–3.6V supply operation.
For engineers reviewing the AT45DB081B-RC-2.5 datasheet, AT45DB081B-RC-2.5 pinout, AT45DB081B-RC-2.5 application, or AT45DB081B-RC-2.5 equivalent, key selection considerations include page-program timing, buffer-assisted continuous read capability, hardware write protection (WP), RDY/BUSY signaling, and 5.0V-tolerant control pins for mixed-voltage system interfacing.
Technical Context
The AT45DB081B-RC-2.5 implements a dedicated SPI-based Flash architecture with hierarchical memory organization (pages/blocks/sectors) and two independent 264-byte SRAM buffers enabling concurrent data reception and nonvolatile programming. Its instruction set supports page/block erase, buffer-to-memory program with built-in erase, and main memory page-to-buffer transfer - all self-timed without external high-voltage programming.
It operates in SPI Mode 0 or Mode 3, with data sampled on SCK rising edge (SI) and output on falling edge (SO). The RDY/BUSY open-drain pin reflects internal state during Group A operations (e.g., page program, block erase, compare), while Group B operations (buffer read/write, status read) remain accessible during busy periods.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8,650,752 bits (4096 × 264-byte pages) - enables compact firmware image storage with byte-aligned access via buffer-assisted read-modify-write. |
| Supply Voltage | 2.5V–3.6V - supports low-power battery-operated and 2.5V logic systems without level-shifting. |
| Max Clock Frequency | 20 MHz - delivers up to 2.5 MB/s sequential read throughput in Continuous Array Read mode. |
| Active Read Current | 4 mA typical - minimizes power draw during boot-time code shadowing or streaming audio playback. |
| Standby Current | 2 µA typical - ensures ultra-low quiescent consumption in sleep-mode IoT endpoints. |
| Write Protection | Hardware WP pin protects first 256 pages - prevents accidental overwrite of bootloader or calibration data. |
| Input Tolerance | 5.0V-tolerant SI, SCK, CS, RESET, WP - simplifies interface to 3.3V/5V microcontrollers without external translators. |
Pinout & Package
AT45DB081B-RC-2.5 is packaged in a 28-pin TSOP-I (Type 1) with 0.55 mm pitch, RoHS-compliant, and rated for industrial temperature range (−40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command initiation; must remain low during full instruction sequence (opcode + address + data). |
| SCK | Serial Clock | Input-only clock; controls data sampling (SI) on rising edge and data output (SO) on falling edge; supports SPI modes 0/3. |
| SI | Serial Input | Input-only data line for opcodes, addresses, and buffer writes; accepts 5.0V-tolerant signals. |
| SO | Serial Output | Output-only data line for read data and status register; tri-stated when CS is high. |
| WP | Write Protect | Active-low hardware lock for first 256 pages; enables robust bootloader protection without software overhead. |
| RESET | Chip Reset | Active-low asynchronous reset; terminates ongoing operations and returns state machine to idle; internally pulled up. |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output; driven low during self-timed operations (program/erase/transfer); requires 1 kΩ external pull-up. |
| VCC | Power Supply | 2.5V–3.6V primary supply; powers core logic, Flash array, and buffers; decoupling capacitor required. |
| GND | Ground | Reference return path for VCC and I/O; separate analog/digital grounding not required due to serial architecture. |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers (264 B each) | Enables pipelined operation: receive new data into one buffer while programming the other into Flash - eliminates host wait states. |
| Continuous Array Read | Supports uninterrupted streaming from any starting address across page boundaries with no address re-sending - ideal for audio/video playback. |
| Self-Timed Page Program | No external high-voltage generator needed; erase+program completes in ≤20 ms (tEP) with automatic status reporting via RDY/BUSY or status register. |
| Page/Block Erase Flexibility | Allows selective erasure of individual 264-byte pages or 8-page blocks (2112 bytes) - optimizes wear leveling and reduces update latency vs. full-chip erase. |
| EEPROM Emulation Support | Three-step Read-Modify-Write using buffers enables bit/byte-alterable storage behavior - suitable for parameter tables and event logs. |
Applications
| Firmware Storage | Code Shadowing |
|---|---|
Use Scenario: Storing bootloaders, application firmware, and configuration data in resource-constrained microcontroller systems. IC Role / Device Role / Timing Role: Nonvolatile storage device providing SPI-accessible program code; replaces parallel NOR Flash with lower pin count and layout simplicity. Use Value: Eliminates need for external address/data buses; reduces PCB layer count and EMI emissions via serial interface. |
Use Scenario: Loading executable code from Flash into RAM at system startup for faster execution speed. IC Role / Device Role / Timing Role: High-throughput sequential memory source; leverages Continuous Array Read to stream contiguous code blocks without address overhead. Use Value: Achieves >2 MB/s effective read bandwidth at 20 MHz SCK - matches ARM Cortex-M4/M7 cache line fill requirements. |
| Data Logging | Audio Playback Buffer |
Use Scenario: Recording sensor readings, error logs, or telemetry in industrial controllers and medical devices. IC Role / Device Role / Timing Role: Reliable, wear-leveling-capable storage with hardware write protection; supports EEPROM-like byte updates via buffer-assisted R-M-W. Use Value: Extends endurance beyond standard Flash by distributing writes across pages; WP pin safeguards critical metadata sectors. |
Use Scenario: Streaming pre-recorded voice prompts, alarm tones, or audio alerts in home appliances and automotive HMI. IC Role / Device Role / Timing Role: Low-latency, continuous-read memory source synchronized to DAC clock; uses RDY/BUSY to coordinate buffer refill timing. Use Value: Enables gapless playback across 264-byte page boundaries with zero CPU intervention during boundary transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| W25Q80DVSSIG | 8-Mbit Quad SPI NOR Flash; 104 MHz QSPI clock; no integrated SRAM buffers; requires external command sequencing for page program. | Better raw throughput in QSPI mode but lacks seamless continuous read and buffer pipelining; no hardware WP for partial sector lock. | Select for high-speed code XIP or when QSPI controller is available; avoid when buffer-assisted streaming or EEPROM emulation is required. |
| AT45DB081E-RC-2.5 | Successor revision with enhanced reliability; identical pinout, timing, and command set; improved data retention (20 years @ 85°C vs. 10 years). | Drop-in replacement for new designs requiring extended lifetime in harsh environments; same footprint and firmware compatibility. | Prefer for new industrial deployments where long-term data integrity is critical; legacy AT45DB081B-RC-2.5 remains valid for cost-sensitive or existing-design refreshes. |
Compared with W25Q80DVSSIG, AT45DB081B-RC-2.5 provides deterministic low-latency streaming and hardware-assisted EEPROM emulation, while AT45DB081E-RC-2.5 offers extended data retention without design changes - making the original part optimal for buffered real-time data paths and legacy system continuity.
Availability
AT45DB081B-RC-2.5 is available at Aetrix Electronics and suitable for firmware storage, code shadowing, and data logging applications requiring stable component supply, industrial temperature tolerance, and long-lifecycle support.
Supply support for AT45DB081B-RC-2.5 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 acquired Atmel in 2016 and maintains full product support, documentation, and manufacturing continuity for the DataFlash family.
The AT45DB081B-RC-2.5 belongs to Microchip's legacy DataFlash series, designed specifically for embedded systems needing SPI-based nonvolatile memory with integrated buffering and simplified firmware update workflows.
FAQ
What is the maximum clock frequency supported by AT45DB081B-RC-2.5?
The AT45DB081B-RC-2.5 supports a maximum serial clock (SCK) frequency of 20 MHz for all read, write, and command operations. This allows sustained data transfer rates up to 2.5 MB/s in Continuous Array Read mode. Timing compliance must be verified against tV and tH specifications in the official Microchip datasheet Rev. 2225F.
Does AT45DB081B-RC-2.5 require high-voltage programming?
No, AT45DB081B-RC-2.5 does not require high-voltage programming. All program and erase operations are performed using only the 2.5V–3.6V VCC supply. Internal charge pumps generate necessary voltages, eliminating external HV circuitry and simplifying system design - a key differentiator from conventional parallel Flash devices.
How does the RDY/BUSY pin function on AT45DB081B-RC-2.5?
The RDY/BUSY pin on AT45DB081B-RC-2.5 is an open-drain output that drives low during internally self-timed operations (e.g., page program, block erase, buffer transfer). It remains high otherwise. A 1 kΩ external pull-up resistor is required. Polling this pin or the status register bit 7 avoids time-wasting delays in host firmware.
Can AT45DB081B-RC-2.5 emulate EEPROM functionality?
Yes, AT45DB081B-RC-2.5 supports EEPROM emulation via its built-in three-step Read-Modify-Write operation using the dual SRAM buffers. This enables reliable byte- or bit-level alterations without requiring full-page erases - essential for storing configuration parameters, calibration data, or event counters in embedded applications.
Is AT45DB081B-RC-2.5 compatible with 5V microcontrollers?
Yes, AT45DB081B-RC-2.5 features 5.0V-tolerant inputs on SI, SCK, CS, RESET, and WP pins. This allows direct connection to 5V logic families without level shifters, while maintaining full 2.5V–3.6V operation of the core memory and buffers - simplifying mixed-voltage board design and reducing BOM cost.
AT45DB081B-RC-2.5 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:
- 15 MHz
- Write Cycle Time - Word, Page:
- 14ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOIC
AT45DB081B-RC-2.5 FAQ
1.How can I place an order for AT45DB081B-RC-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB081B-RC-2.5 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-RC-2.5 reliable?
The price and inventory of AT45DB081B-RC-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB081B-RC-2.5 is usually 5 days.
3.What payment methods are accepted for AT45DB081B-RC-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB081B-RC-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB081B-RC-2.5?
AT45DB081B-RC-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB081B-RC-2.5 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-RC-2.5?
For technical support, including AT45DB081B-RC-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB081B-RC-2.5 requirements.
6.How does Aetrix verify that AT45DB081B-RC-2.5 is sourced from the original manufacturer or authorized distributors?
All AT45DB081B-RC-2.5 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-RC-2.5 meets industry standards.
7.What is the process for return or replacement of AT45DB081B-RC-2.5?
All AT45DB081B-RC-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB081B-RC-2.5, 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-RC-2.5 part is unused and in its original packaging.
Return procedure for AT45DB081B-RC-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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