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Renesas AT45DB081D-SU SL955-AD
- Part No.:
- AT45DB081D-SU SL955-AD
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT45DB081D-SU SL955-AD.pdf
- Description:
- IC FLASH 8MBIT SPI 66MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,359
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Product details
Overview
AT45DB081D-SU from Adesto Technologies is an 8-Mbit serial DataFlash memory IC with RapidS™ SPI-compatible interface, supporting up to 66 MHz clock frequency, 256- or 264-byte configurable page size, and dual 256-/264-byte SRAM buffers for concurrent read-while-write operation. It operates from a single 2.5V–3.6V supply and targets embedded code shadowing, firmware storage, and secure data logging in industrial control systems.
For engineers reviewing the AT45DB081D-SU datasheet, AT45DB081D-SU pinout, AT45DB081D-SU application, or AT45DB081D-SU equivalent, key selection considerations include its dual-buffer architecture enabling zero-latency page reprogramming, sector lockdown for secure boot code, and JEDEC-standard ID read capability for automated BOM verification.
Technical Context
The AT45DB081D-SU implements a sequential-access Flash architecture organized as 4,096 pages (256 or 264 bytes each), eliminating parallel address bus overhead. Its RapidS interface supports SPI Modes 0 and 3 with MSB-first framing and built-in self-timed erase/program cycles - no external high-voltage programming required.
Two independent SRAM buffers allow simultaneous host data streaming into one buffer while the other writes to Flash, enabling continuous data capture in telemetry and audio buffering applications. Page, block (2 KB), sector (64 KB), and chip (8 Mbit) erase granularity provides precise wear-leveling control without full-array erasure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 8,650,752 bits (8 Mbit), organized as 4,096 × 256/264-byte pages |
| Interface Speed | Up to 66 MHz SCK for Continuous Array Read (fCAR1), SPI Mode 0/3 compatible |
| Supply Voltage | 2.5V–3.6V or 2.7V–3.6V single supply - eliminates level-shifting in 3.3V microcontroller systems |
| Active Read Current | 7 mA typical - enables low-power operation in battery-backed data loggers |
| Deep Power-Down Current | 15 µA typical - supports ultra-low-quiescent standby in always-on IoT edge nodes |
| Endurance & Retention | 100,000 program/erase cycles per page; 20-year data retention at industrial temperature range |
| Security Features | 128-byte security register (64-byte user programmable + 64-byte unique device ID); sector lockdown capability |
Pinout & Package
AT45DB081D-SU is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with standard 150-mil body width and RoHS-compliant green finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; falling edge initiates command sequence; high-impedance SO output when deasserted |
| SCK | Serial Clock | Input clock controlling data timing; SI latched on rising edge, SO driven on falling edge |
| SI | Serial Input | Command, address, and data input path; MSB-first protocol with no internal pull-up |
| SO | Serial Output | Command response and memory data output; tri-stated when CS is high |
| WP | Write Protect | Hardware lock for protected sectors; active-low; overrides software protection when asserted |
| RESET | Reset | Active-low hard reset; terminates ongoing operations and resets internal state machine |
| VCC | Power Supply | Single 2.5V–3.6V supply rail; powers all logic and Flash array; no separate I/O voltage required |
| GND | Ground | Reference return path for VCC and all I/O signals; must be low-impedance connection |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | 2 × 256-/264-byte buffers enable true concurrent read-while-write - eliminates write latency in real-time sensor data acquisition |
| Configurable Page Size | User-selectable 256- or 264-byte pages via factory configuration - optimizes alignment for legacy EEPROM emulation vs. binary firmware images |
| Flexible Erase Granularity | Page (256B), block (2 KB), sector (64 KB), or chip (8 Mbit) erase - supports fine-grained wear leveling and partial firmware updates |
| Continuous Array Read | Legacy (E8H) and high-speed (0BH) modes with automatic page-wrap - ideal for XIP code shadowing without address management overhead |
| Hardware Sector Protection | WP pin enforces physical lock on protected sectors independent of software commands - prevents accidental corruption of bootloader regions |
| Unique Device Identifier | 64-byte factory-programmed ID in security register - enables device-specific encryption keys and secure provisioning in production lines |
Applications
| Firmware Storage | Secure Boot Code |
|---|---|
Use Scenario: Storing MCU application firmware in resource-constrained industrial controllers where field upgrades are performed over UART or CAN. IC Role / Device Role / Timing Role: Nonvolatile program memory with fast sequential read for code shadowing into RAM during boot. Use Value: 66 MHz Continuous Array Read enables sub-100 ms firmware load time; sector lockdown prevents unauthorized modification of critical boot sections. |
Use Scenario: Hosting immutable bootloader code in medical devices requiring regulatory compliance and anti-tampering assurance. IC Role / Device Role / Timing Role: Secure, write-protected storage for signed boot images verified before execution. Use Value: Hardware WP pin + sector lockdown ensures bootloader integrity even if host MCU is compromised; unique device ID enables per-unit cryptographic binding. |
| Data Logging | Audio Buffering |
Use Scenario: Capturing timestamped sensor readings in environmental monitoring nodes powered by solar-charged batteries. IC Role / Device Role / Timing Role: High-endurance Flash with dual-buffer streaming for gapless recording during intermittent power events. Use Value: 100,000 P/E cycles and 15 µA deep power-down extend battery life beyond 5 years; buffer-to-page programming avoids data loss during voltage dips. |
Use Scenario: Storing short voice prompts or alarm tones in smart home hubs with limited PCB space. IC Role / Device Role / Timing Role: Low-pin-count serial memory replacing parallel NOR Flash to reduce layout complexity. Use Value: 8-pin SOIC footprint and SPI interface cut board area by >60% vs. 32-pin parallel Flash; 264-byte page size aligns with common PCM audio frame sizes. |
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 dual buffers; no page-size configurability; 1.65–1.95V or 2.7–3.6V supply | Lacks concurrent read-while-write; requires software-managed erase-before-write; better suited for simple code storage without streaming | Select when maximum read speed and broad voltage compatibility outweigh buffer flexibility |
| Macronix MX25L8006EM1I-12G | 8 Mbit SPI NOR Flash; 86 MHz max clock; no SRAM buffers; fixed 256-byte pages; 2.7–3.6V supply; no security register | No hardware write protection or device ID; simpler command set but no sector lockdown or secure provisioning features | Select for cost-sensitive designs where security and streaming are not required |
Compared with AT45DB081D-SU, W25Q80DVSSIG offers higher read bandwidth but lacks dual-buffer concurrency and secure identity features, while MX25L8006EM1I-12G provides lower unit cost but omits hardware-based sector protection and device-specific identification - making AT45DB081D-SU uniquely suitable for secure, streaming-aware embedded firmware storage.
Availability
AT45DB081D-SU is available at Aetrix Electronics and suitable for firmware storage, secure boot code hosting, and industrial data logging requiring stable component supply across extended product lifecycles.
Supply support for AT45DB081D-SU 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 nonvolatile memory and analog interface solutions for industrial and IoT applications.
The AT45DB081D-SU belongs to the DataFlash® family, designed specifically for embedded systems needing efficient serial Flash with integrated SRAM buffers and hardware security - bridging the functional gap between traditional NOR Flash and EEPROM.
FAQ
What is the maximum clock frequency supported by the AT45DB081D-SU for continuous array read operations?
The AT45DB081D-SU supports up to 66 MHz for Continuous Array Read using opcodes E8H (legacy mode) and 0BH (high-frequency mode), as specified by the fCAR1 parameter. This enables rapid code shadowing and streaming data retrieval without address overhead. The AT45DB081D-SU maintains full functionality at this rate under industrial temperature conditions with proper signal integrity design.
Does the AT45DB081D-SU require external high-voltage programming circuitry?
No, the AT45DB081D-SU performs all program and erase operations using only its standard 2.5V–3.6V supply - no external VPP or charge pump circuitry is needed. All timing is internally self-controlled, simplifying system design and reducing bill-of-materials count. This feature is intrinsic to the AT45DB081D-SU's architecture and confirmed in its datasheet revision 3596P–DFLASH–2/2014.
How does the dual-buffer architecture of the AT45DB081D-SU improve system responsiveness?
The AT45DB081D-SU's two independent 256-/264-byte SRAM buffers allow the host to stream new data into one buffer while the other simultaneously programs a page into Flash memory - eliminating write latency and enabling uninterrupted data capture. This capability is essential for real-time applications like sensor logging and audio buffering, where gaps in recording are unacceptable. The AT45DB081D-SU guarantees this behavior across its full operating voltage and temperature range.
Can the AT45DB081D-SU be used as a direct replacement for standard SPI NOR Flash devices?
The AT45DB081D-SU is not a pin-compatible or command-compatible drop-in replacement for conventional SPI NOR Flash due to its unique RapidS interface, dual-buffer commands, and page-structured architecture. While it shares SPI Mode 0/3 electrical compatibility, its opcode set, addressing scheme, and buffer-centric workflow require firmware adaptation. Direct substitution without software changes is not supported for the AT45DB081D-SU.
What security mechanisms does the AT45DB081D-SU provide for protecting stored firmware?
The AT45DB081D-SU provides three layered security features: (1) hardware Write Protect (WP) pin that physically disables programming/erasing of protected sectors, (2) software-configurable Sector Lockdown that permanently prevents modification of designated memory regions, and (3) a 128-byte Security Register containing 64 bytes of user-programmable space and a factory-programmed 64-byte Unique Device Identifier. These features are fully implemented and documented for the AT45DB081D-SU in its official datasheet.
AT45DB081D-SU SL955-AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 8Mbit
- Memory Organization:
- 256 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-SOIC
AT45DB081D-SU SL955-AD FAQ
1.How can I place an order for AT45DB081D-SU SL955-AD through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB081D-SU SL955-AD 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-SU SL955-AD reliable?
The price and inventory of AT45DB081D-SU SL955-AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB081D-SU SL955-AD is usually 5 days.
3.What payment methods are accepted for AT45DB081D-SU SL955-AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB081D-SU SL955-AD transactions.
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4.How is shipping managed for AT45DB081D-SU SL955-AD?
AT45DB081D-SU SL955-AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB081D-SU SL955-AD 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-SU SL955-AD?
For technical support, including AT45DB081D-SU SL955-AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB081D-SU SL955-AD requirements.
6.How does Aetrix verify that AT45DB081D-SU SL955-AD is sourced from the original manufacturer or authorized distributors?
All AT45DB081D-SU SL955-AD 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-SU SL955-AD meets industry standards.
7.What is the process for return or replacement of AT45DB081D-SU SL955-AD?
All AT45DB081D-SU SL955-AD units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB081D-SU SL955-AD, 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-SU SL955-AD part is unused and in its original packaging.
Return procedure for AT45DB081D-SU SL955-AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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