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Renesas AT45DB081D-MU
- Part No.:
- AT45DB081D-MU
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
AT45DB081D-MU.pdf
- Description:
- IC FLASH 8MBIT SPI 66MHZ 8VDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,637
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Product details
Overview
AT45DB081D-MU from Adesto Technologies is an 8 Mbit serial DataFlash memory IC with RapidS™ SPI-compatible interface, organized as 4,096 pages × 256/264 bytes, supporting up to 66 MHz clock frequency, dual 256-/264-byte SRAM buffers, and flexible erase granularity (page/block/sector/chip) - ideal for code shadowing and firmware storage in resource-constrained embedded systems.
For engineers reviewing the AT45DB081D-MU datasheet, AT45DB081D-MU pinout, AT45DB081D-MU application, or AT45DB081D-MU equivalent, key selection considerations include its 2.5V–3.6V single-supply operation, hardware write-protect (WP) pin, RESET functionality, continuous array read capability, and sector lockdown security features for secure boot and OTA update storage.
Technical Context
The AT45DB081D-MU implements a sequential-access Flash architecture using a 3-wire SPI-compatible RapidS interface (modes 0 and 3), eliminating parallel address/data buses and reducing pin count to 8. Its dual SRAM buffers enable simultaneous data reception and Flash reprogramming - critical for streaming firmware updates without interrupting host operations.
Memory organization supports user-configurable page size (256 or 264 bytes), factory-preconfigured to 256-byte mode. Erase operations are fully self-timed and support four granularities: page (256 B), block (2 KB), sector (64 KB), and chip (8 Mbit), with sector lockdown and 128-byte security register enabling secure code partitioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 8,650,752 bits (8 Mbit), organized as 4,096 pages of 256 or 264 bytes each |
| Interface Speed | Up to 66 MHz SCK for Continuous Array Read (0BH/E8H), enabling >8 MB/s sustained throughput |
| Supply Voltage | 2.5V–3.6V single supply - eliminates need for level shifters in 2.5V/3.3V microcontroller systems |
| Active Read Current | 7 mA typical - enables low-power logging and sensor node firmware storage |
| Standby Current | 25 µA typical - supports battery-backed applications with multi-year retention |
| Data Retention | 20 years at 85°C - validated for industrial temperature range (-40°C to +85°C) |
| Endurance | 100,000 program/erase cycles per page - sufficient for frequent firmware update partitions |
| Security Features | 128-byte security register (64-byte user programmable + 64-byte unique ID) and sector lockdown |
Pinout & Package
AT45DB081D-MU is packaged in an 8-pin MLF (VDFN) 3×4 mm body with exposed thermal pad (floating or GND). Pin functions are electrically identical to SOIC-8 variant but optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; high-to-low transition initiates command, low-to-high terminates operation - required for all SPI transactions |
| SCK | Serial Clock | Input clock controlling data latching (SI on rising edge) and output timing (SO on falling edge) - supports up to 66 MHz |
| SI | Serial Input | Command, address, and data input path - MSB-first, synchronous to SCK rising edge |
| SO | Serial Output | Data output path for reads - tri-stated when CS is high; outputs on SCK falling edge |
| WP | Write Protect | Hardware-level sector protection override - low assertion blocks all program/erase commands to protected sectors |
| RESET | Reset Input | Active-low asynchronous reset - terminates ongoing operations and returns state machine to idle |
| VCC | Power Supply | 2.5V–3.6V single supply - powers logic, Flash array, and buffers; no high-voltage programming required |
| GND | Ground Reference | System ground return - must be low-impedance connection to minimize noise during high-speed reads |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 256-/264-byte buffers enable concurrent data streaming into buffer while Flash page is being reprogrammed - eliminates host wait states during firmware updates |
| Continuous Array Read | Single-command sequential read across entire memory (E8H/0BH/03H) with automatic page-wrap and no inter-page delay - ideal for XIP-like code shadowing |
| Flexible Page Size | User-selectable 256- or 264-byte pages; factory-configurable to 256-byte mode - simplifies byte-aligned EEPROM emulation via read-modify-write |
| Sector Lockdown | Hardware-enforced write-protection for individual sectors - prevents accidental overwrite of bootloader or cryptographic keys during field updates |
| JEDEC ID Support | Standard Manufacturer ID (1Fh) and Device ID (26h) readable via SPI - enables automated device identification in production test and bootloader initialization |
| Green Packaging | Pb/Halide-free, RoHS-compliant MLF package - meets environmental compliance requirements for industrial and medical end equipment |
Applications
| Secure Bootloader Storage | Firmware Over-the-Air (OTA) Update Buffer |
|---|---|
Use Scenario: Storing immutable bootloader code and public key certificates in a tamper-resistant partition. IC Role / Device Role / Timing Role: Non-volatile storage with sector lockdown and hardware write protect ensuring integrity against malicious or erroneous writes. Use Value: Prevents unauthorized modification of boot code using dedicated 64 KB sector protection and unique device identifier for secure provisioning. |
Use Scenario: Receiving and staging new firmware images in real time while legacy code continues execution. IC Role / Device Role / Timing Role: Dual-buffered Flash memory enabling background download into one SRAM buffer while executing from Flash or shadowing into RAM. Use Value: Eliminates system downtime during updates - 256-byte buffer allows pipelined write/program cycles at full 66 MHz interface speed. |
| Industrial Sensor Data Logging | Audio Voice Recording in Edge Devices |
Use Scenario: Long-term timestamped sensor readings (temperature, pressure, vibration) stored locally before cloud upload. IC Role / Device Role / Timing Role: Low-power, high-endurance Flash memory with 25 µA standby current and 100K-cycle page endurance. Use Value: Supports 10+ years of daily logging at 1 KB/day using wear-leveling firmware - enabled by page-erasable granularity and predictable tPE timing. |
Use Scenario: Storing compressed voice prompts or recorded audio clips in smart speakers, medical voice recorders, or IVR systems. IC Role / Device Role / Timing Role: High-throughput serial Flash with continuous read capability and 66 MHz interface for real-time audio streaming. Use Value: Delivers >8 MB/s sustained read bandwidth - sufficient for uncompressed PCM playback or low-latency MP3 decode buffering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Winbond W25Q80DVSSIG | 8 Mbit SPI NOR Flash, 104 MHz max clock, no SRAM buffers, no sector lockdown, standard JEDEC SFDP | Lacks dual-buffer streaming and hardware sector lock; relies on software-based protection | Choose for cost-sensitive designs requiring higher clock speed and standard SFDP compatibility, but accept reduced update safety and no concurrent I/O |
| Macronix MX25L8006EM1I-12G | 8 Mbit SPI NOR Flash, 86 MHz max clock, no SRAM buffers, no security register, supports Quad SPI | No built-in security features or buffer-assisted streaming; requires external logic for safe OTA updates | Prefer when Quad SPI interface or faster random access is needed, but forfeits AT45DB081D-MU's seamless continuous read and secure sector isolation |
Compared with W25Q80DVSSIG and MX25L8006EM1I-12G, the AT45DB081D-MU uniquely delivers concurrent buffer-and-Flash operation, hardware-enforced sector lockdown, and deterministic continuous-read timing - making it optimal for safety-critical firmware storage where update atomicity and code integrity are mandatory.
Availability
AT45DB081D-MU is available at Aetrix Electronics and suitable for industrial control firmware storage, secure bootloader deployment, and edge-device OTA update staging requiring stable component supply and long-term lifecycle support.
Supply support for AT45DB081D-MU 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
Adesto Technologies (now part of Dialog Semiconductor, a Renesas company) specialized in low-power, high-reliability non-volatile memory solutions for IoT and industrial applications.
The AT45DB081D-MU belongs to the DataFlash® family - designed specifically for embedded systems needing SPI-based Flash with integrated SRAM buffers, rapid sequential access, and hardware security features for firmware and data integrity.
FAQ
What is the maximum clock frequency supported by the AT45DB081D-MU for continuous read operations?
The AT45DB081D-MU supports up to 66 MHz for Continuous Array Read using opcodes 0BH (High Frequency Mode) and E8H (Legacy Mode), as specified by the fCAR1 parameter. This enables sustained read throughput exceeding 8 MB/s. The 03H Low Frequency Mode supports up to 33 MHz without dummy byte overhead. All modes maintain zero inter-page latency during wraparound reads across the full 8 Mbit array.
Does the AT45DB081D-MU require high-voltage programming or external VPP supply?
No, the AT45DB081D-MU operates entirely from a single 2.5V–3.6V supply for both read and program/erase operations - no high-voltage VPP pin or external charge pump is required. All internal programming voltages are generated on-chip, simplifying power design and enabling direct interfacing with 2.5V or 3.3V microcontrollers without level translation.
How does the dual-buffer architecture of the AT45DB081D-MU improve firmware update reliability?
The AT45DB081D-MU's two independent 256-/264-byte SRAM buffers allow the host to stream new firmware into one buffer while simultaneously programming the other buffer's contents into Flash - decoupling receive and write operations. This prevents data loss during power failure and enables atomic page updates, significantly improving robustness in OTA update scenarios compared to single-buffer or NOR Flash alternatives.
Can the AT45DB081D-MU be used as a drop-in replacement for standard SPI NOR Flash devices?
The AT45DB081D-MU is not a pin- or command-compatible drop-in replacement for standard SPI NOR Flash (e.g., Winbond or Macronix parts) due to its unique RapidS protocol, dual-buffer commands, and page-oriented architecture. While it shares the same 8-pin SOIC/MLF footprint and basic SPI signals (CS/SCK/SI/SO), its instruction set, addressing scheme, and buffer-centric workflow require firmware adaptation.
What security mechanisms does the AT45DB081D-MU provide for protecting firmware or configuration data?
The AT45DB081D-MU provides three layered security features: (1) hardware WP pin that globally disables program/erase on protected sectors, (2) software-controllable Sector Protection Register with individual sector lockdown, and (3) a 128-byte Security Register containing 64-byte user-programmable space and a factory-programmed 64-byte unique device identifier - enabling secure key binding and anti-cloning measures in bootloader implementations.
AT45DB081D-MU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tray
- 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:
- 66 MHz
- Write Cycle Time - Word, Page:
- 4ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VDFN (6x5)
AT45DB081D-MU FAQ
1.How can I place an order for AT45DB081D-MU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB081D-MU 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 AT45DB081D-MU reliable?
The price and inventory of AT45DB081D-MU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB081D-MU is usually 5 days.
3.What payment methods are accepted for AT45DB081D-MU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB081D-MU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB081D-MU?
AT45DB081D-MU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB081D-MU 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 AT45DB081D-MU?
For technical support, including AT45DB081D-MU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB081D-MU requirements.
6.How does Aetrix verify that AT45DB081D-MU is sourced from the original manufacturer or authorized distributors?
All AT45DB081D-MU 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 AT45DB081D-MU meets industry standards.
7.What is the process for return or replacement of AT45DB081D-MU?
All AT45DB081D-MU units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB081D-MU, 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 AT45DB081D-MU part is unused and in its original packaging.
Return procedure for AT45DB081D-MU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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