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Renesas AT45DB081D-SU-SL955
- Part No.:
- AT45DB081D-SU-SL955
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DB081D-SU-SL955.pdf
- Description:
- IC FLASH 8MBIT SPI 66MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,505
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Product details
Overview
AT45DB081D-SU-SL955 from Adesto Technologies is an 8-Mbit serial DataFlash memory IC with RapidS™ SPI-compatible interface, 256/264-byte page architecture, dual 256-/264-byte SRAM buffers, and industrial temperature support. It delivers 66 MHz max clock speed, 100,000 program/erase cycles per page, and 20-year data retention - ideal for embedded code shadowing and firmware storage in resource-constrained systems.
For engineers reviewing the AT45DB081D-SU-SL955 datasheet, AT45DB081D-SU-SL955 pinout, AT45DB081D-SU-SL955 application, or AT45DB081D-SU-SL955 equivalent, key selection criteria include its dual-buffered sequential read capability, hardware/software sector protection, flexible erase granularity (page/block/sector/chip), low-power operation (7 mA active, 15 µA deep power-down), and factory-configurable 256-byte page mode.
Technical Context
The AT45DB081D-SU-SL955 implements a RapidS™ serial interface fully compatible with SPI Modes 0 and 3, supporting up to 66 MHz clock frequency for high-speed continuous array reads. Its memory architecture comprises 4,096 pages of 256- or 264-byte capacity, organized into 16 sectors (including split Sector 0a/0b), with each sector containing multiple 2-Kbyte blocks.
Two independent 256-/264-byte SRAM buffers enable concurrent data reception and Flash reprogramming, while self-timed page program, erase, and read operations eliminate external timing control. The device supports EEPROM emulation via internal read-modify-write sequences and integrates a 128-byte security register with 64-byte user-programmable space and unique 64-byte device identifier.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 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 (Legacy E8H/High-Freq 0BH modes) |
| Supply Voltage | 2.5 V or 2.7 V to 3.6 V single supply - enables direct integration with 2.5/3.3 V logic without level shifters |
| Power Consumption | 7 mA typical active read current; 15 µA typical deep power-down current - suitable for battery-backed or energy-sensitive designs |
| Erase Granularity | Page (256 B), Block (2 Kbytes), Sector (64 Kbytes), Chip (8 Mbit) - allows precise field firmware updates without full chip reflash |
| Data Retention | 20 years minimum at industrial temperature range (–40°C to +85°C) - validated for long-life embedded deployments |
| Endurance | 100,000 program/erase cycles per page - supports frequent over-the-air (OTA) firmware patching |
Pinout & Package
AT45DB081D-SU-SL955 is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) surface-mount package with standard 150-mil body width and 1.27 mm pitch. Pin 1 is marked with a dot or notch; the metal pad on bottom (in MLF variants) is floating or GND-connected, but this SOIC variant has no exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; falling edge initiates command sequence, rising edge terminates operation and places SO in high-Z state |
| SCK | Serial Clock | Input clock controlling data transfer timing; SI latched on rising edge, SO driven on falling edge |
| SI | Serial Input | Command, address, and data input line; MSB-first protocol supports opcodes, addresses, and payload streaming |
| SO | Serial Output | Tri-state output for read data; automatically enters high-impedance when CS is deasserted |
| WP | Write Protect | Hardware-level sector lock; low assertion overrides software protection and blocks all program/erase commands to protected sectors |
| RESET | Reset Input | Active-low asynchronous reset; terminates ongoing operations and returns state machine to idle - optional but recommended for robust recovery |
| VCC | Power Supply | Single 2.5 V / 2.7–3.6 V supply; powers core logic, Flash array, and I/O buffers - no high-voltage programming required |
| GND | Ground Reference | Common return path for VCC and all I/O signals; must be low-impedance connection to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | 2 × 256-/264-byte independent buffers enable simultaneous data streaming and Flash reprogramming - eliminates write latency bottlenecks in real-time logging |
| Continuous Array Read | Seamless wrap-around reads across page and array boundaries at up to 66 MHz - ideal for boot code shadowing without CPU intervention |
| Flexible Page Size | User-selectable 256- or 264-byte page mode; factory pre-configurable for 256-byte binary alignment - simplifies legacy EEPROM migration |
| Sector Lockdown | Hardware-enforced lockdown of individual sectors using WP pin or software commands - secures bootloader or calibration data against accidental overwrite |
| Security Register | 128-byte dedicated register with 64-byte user-programmable space and unique 64-byte device ID - enables secure device authentication and traceability |
| JEDEC ID Support | Standard Manufacturer ID (1Fh) and Device ID (26h) readable via SPI - ensures interoperability with generic Flash programming tools and debuggers |
Applications
| Firmware Storage | Industrial Data Logging |
|---|---|
Use Scenario: Storing boot code, application firmware, and configuration parameters in microcontroller-based edge devices requiring field-upgradable software. IC Role / Device Role / Timing Role: Nonvolatile code storage with rapid sequential read access; serves as primary boot source for ARM Cortex-M or RISC-V MCUs. Use Value: Continuous Array Read at 66 MHz enables zero-wait-state execution from Flash, reducing startup time and eliminating need for external RAM buffering. |
Use Scenario: Capturing sensor readings, event timestamps, and diagnostic logs in programmable logic controllers (PLCs) and motor drives operating in harsh environments. IC Role / Device Role / Timing Role: High-endurance data buffer with sector-level erase control; stores time-series data with timestamped page writes. Use Value: 100,000 program/erase cycles per page and 20-year retention ensure reliable decade-long operation without data loss in unattended installations. |
| Secure Bootloader Storage | Audio/Video Metadata Buffer |
Use Scenario: Hosting immutable bootloader code and cryptographic keys in medical devices and industrial gateways where firmware integrity is safety-critical. IC Role / Device Role / Timing Role: Secure nonvolatile storage with hardware sector lockdown and unique device ID; isolated from application partition. Use Value: WP pin + Sector Lockdown prevents runtime corruption; 128-byte security register enables secure key provisioning and anti-cloning measures. |
Use Scenario: Caching album art, codec metadata, and playlist indices in portable audio players and smart speakers with limited PCB area. IC Role / Device Role / Timing Role: Low-pin-count serial Flash providing fast random-access metadata retrieval without parallel bus overhead. Use Value: SOIC-8 footprint and 2.5 V operation reduce board space and power budget; dual buffers allow background metadata refresh during playback. |
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 with 4-Kbyte uniform sectors; no SRAM buffers; 104 MHz Quad SPI support | Lacks dual-buffered streaming and continuous array read; optimized for XIP and execute-in-place rather than sequential firmware shadowing | Choose for higher-speed Quad SPI interfaces and simpler command set; avoid if buffer-assisted background writes are required. |
| Macronix MX25L8006EM1I-12G | 8 Mbit SPI NOR Flash with 4-Kbyte sectors; no configurable page size or SRAM buffers; supports standard SPI only (no RapidS) | No page-level flexibility or intelligent programming; lacks security register and device ID; lower max clock (80 MHz) | Select for cost-sensitive industrial designs needing JEDEC-compliant SPI compatibility without advanced DataFlash features. |
Compared with AT45DB081D-SU-SL955, the W25Q80DVSSIG offers faster Quad SPI throughput but sacrifices dual-buffer concurrency and seamless array reads, while the MX25L8006EM1I-12G provides broader distributor availability and longer lifecycle support but omits security registers, sector lockdown, and RapidS optimization for streaming workloads.
Availability
AT45DB081D-SU-SL955 is available at Aetrix Electronics and suitable for firmware storage, industrial data logging, secure bootloader deployment, and audio metadata buffering requiring stable component supply and long-term manufacturability.
Supply support for AT45DB081D-SU-SL955 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, part of Renesas Electronics) specialized in low-power, high-reliability serial Flash and nonvolatile memory solutions for industrial and IoT applications.
The AT45DB081D-SU-SL955 belongs to the DataFlash® family, designed specifically for systems needing efficient sequential access, embedded EEPROM emulation, and hardware-enhanced security - not general-purpose NOR Flash replacement.
FAQ
What is the maximum clock frequency supported by AT45DB081D-SU-SL955 for continuous array reads?
The AT45DB081D-SU-SL955 supports up to 66 MHz for Continuous Array Read using Legacy (E8H) and High-Frequency (0BH) command modes. This is defined by the fCAR1 specification in the datasheet. The Low-Frequency mode (03H) operates up to 33 MHz and omits the dummy byte requirement. All modes maintain seamless wrap-around across page and array boundaries without added latency.
Does AT45DB081D-SU-SL955 support both 256-byte and 264-byte page configurations?
Yes, AT45DB081D-SU-SL955 supports user-configurable page sizes of either 256 bytes or 264 bytes. The 264-byte mode aligns with DataFlash® standard addressing (PA11–PA0 + BA8–BA0), while the 256-byte mode uses binary-aligned addressing (A19–A0). Factory pre-configuration for 256-byte mode is available, enabling straightforward migration from legacy EEPROM architectures.
How does the dual-buffer architecture of AT45DB081D-SU-SL955 improve system performance?
The AT45DB081D-SU-SL955 integrates two independent 256-/264-byte SRAM buffers that operate concurrently with main memory programming. This allows incoming data to be loaded into one buffer while the other buffer's contents are being written to Flash - eliminating write stalls and enabling continuous data streaming in logging or OTA update scenarios without CPU polling or interrupt overhead.
What hardware and software protection mechanisms does AT45DB081D-SU-SL955 provide?
AT45DB081D-SU-SL955 implements layered protection: hardware write protection via the active-low WP pin (blocking all program/erase to protected sectors), software-controlled sector protection register, sector lockdown command, and a 128-byte security register with 64-byte user space and unique 64-byte device ID. These features collectively prevent unauthorized firmware modification and support secure device identity management.
Is AT45DB081D-SU-SL955 compatible with standard SPI controllers?
Yes, AT45DB081D-SU-SL955 is fully compatible with standard SPI controllers operating in Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1). It uses a three-wire interface (CS, SCK, SI/SO) with MSB-first data framing and requires no special drivers - standard SPI libraries can issue opcodes like E8H (Continuous Read), 83H (Buffer-to-Page Program), and 7CH (Sector Erase) directly.
AT45DB081D-SU-SL955 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm 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 FAQ
1.How can I place an order for AT45DB081D-SU-SL955 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB081D-SU-SL955 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 reliable?
The price and inventory of AT45DB081D-SU-SL955 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 is usually 5 days.
3.What payment methods are accepted for AT45DB081D-SU-SL955?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB081D-SU-SL955 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB081D-SU-SL955?
AT45DB081D-SU-SL955 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB081D-SU-SL955 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?
For technical support, including AT45DB081D-SU-SL955 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB081D-SU-SL955 requirements.
6.How does Aetrix verify that AT45DB081D-SU-SL955 is sourced from the original manufacturer or authorized distributors?
All AT45DB081D-SU-SL955 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 meets industry standards.
7.What is the process for return or replacement of AT45DB081D-SU-SL955?
All AT45DB081D-SU-SL955 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB081D-SU-SL955, 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 part is unused and in its original packaging.
Return procedure for AT45DB081D-SU-SL955:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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