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Renesas AT45DB081D-SSU-SL955
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- Part No.:
- AT45DB081D-SSU-SL955
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT45DB081D-SSU-SL955.pdf
- Description:
- IC FLASH 8MBIT SPI 66MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,674
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Product details
Overview
AT45DB081D-SSU-SL955 from Adesto Technologies is an 8 Mbit serial DataFlash memory IC with RapidS™ SPI-compatible interface, supporting up to 66 MHz clock frequency, 256/264-byte configurable page size, and dual 256-/264-byte SRAM buffers for concurrent read/write operations. 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-SSU-SL955 datasheet, AT45DB081D-SSU-SL955 pinout, AT45DB081D-SSU-SL955 application, or AT45DB081D-SSU-SL955 equivalent, key selection criteria include its 66 MHz RapidS interface timing, factory-configurable 256-byte page mode, sector lockdown security, 100,000 program/erase cycles, and SOIC-8 packaging with hardware write protection (WP) and reset (RESET) pins.
Technical Context
The AT45DB081D-SSU-SL955 implements a serial flash architecture with two independent SRAM buffers enabling simultaneous data reception and flash reprogramming - critical for real-time firmware updates. Its memory array comprises 4,096 pages (256 or 264 bytes each), organized into 16 sectors (including split Sector 0a/0b), supporting page-, block-, sector-, and chip-level erase granularity.
RapidS interface compliance with SPI Modes 0 and 3 ensures drop-in compatibility with standard SPI controllers, while continuous array read (E8H/0BH/03H opcodes) enables seamless code execution from flash without address reloads. All program and erase operations are fully self-timed, eliminating external timing control requirements.
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 (fCAR1), enabling >8 MB/s sequential throughput |
| Supply Voltage | 2.5V–3.6V single supply - supports direct integration with 2.5V/3.3V logic domains without level shifters |
| Active Read Current | 7 mA typical - enables low-power operation in battery-backed or energy-constrained systems |
| Standby Current | 25 µA typical - reduces system quiescent power during idle periods |
| Data Retention | 20 years at 85°C - validated for long-life industrial deployments requiring archival reliability |
| Endurance | 100,000 program/erase cycles per page - sufficient for frequent firmware update or logging applications |
Pinout & Package
AT45DB081D-SSU-SL955 is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with 150 mil body width, RoHS-compliant lead finish, and industrial temperature range (–40°C to +85°C). Pin 1 is SI (Serial Input), pin 2 is SCK (Serial Clock), pin 3 is RESET (active-low reset input), pin 4 is CS (Chip Select, active-low), pin 5 is SO (Serial Output), pin 6 is GND, pin 7 is VCC, and pin 8 is WP (Write Protect, active-low).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select (active-low) | Enables device communication; deassertion places SO in high-Z and enters standby mode |
| SCK | Serial Clock input | Controls data latching on rising edge (SI) and output timing on falling edge (SO) |
| SI | Serial Input | Accepts command opcodes, addresses, and data; latched on SCK rising edge |
| SO | Serial Output | Drives read data; clocked out on SCK falling edge; tri-stated when CS is high |
| WP | Hardware Write Protect | Blocks all program/erase commands to protected sectors regardless of software settings |
| RESET | Active-low reset | Aborts ongoing operations and resets internal state machine; internal POR circuit eliminates external RC network |
| VCC | Power supply | 2.5V–3.6V input; powers both logic and flash array; no high-voltage programming required |
| GND | Ground reference | System ground return path; must be low-impedance for stable SPI signaling and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM buffers (256/264-byte) | Enables pipelined operation: receive new data into one buffer while programming flash from the other - eliminates write latency gaps in streaming applications |
| User-configurable page size | Factory-set 256-byte mode simplifies EEPROM emulation and aligns with standard microcontroller memory management units |
| Sector lockdown & 128-byte security register | Provides tamper-resistant storage for cryptographic keys or boot code; 64-byte unique device ID enables secure device authentication |
| Flexible erase hierarchy | Page (256B), block (2KB), sector (64KB), and chip (8Mbit) erase options allow precise wear leveling and partial firmware updates without full reflash |
| Continuous array read (E8H/0BH) | Eliminates address retransmission overhead - supports direct XIP (execute-in-place) from flash in microcontrollers with serial memory interfaces |
Applications
| Firmware Storage | Secure Boot Code |
|---|---|
|
Use Scenario: Storing MCU application firmware in resource-constrained IoT edge nodes with limited PCB area. IC Role / Device Role / Timing Role: Nonvolatile program memory accessed via SPI during boot and runtime updates. Use Value: 66 MHz RapidS interface enables fast firmware load times; 256-byte page size matches typical bootloader partition alignment. |
Use Scenario: Protecting immutable boot code against corruption or malicious overwrite in industrial gateways. IC Role / Device Role / Timing Role: Secure code repository with hardware-enforced sector lockdown and unique device ID binding. Use Value: WP pin + sector lockdown prevents unauthorized modification; 128-byte security register stores encrypted signature keys. |
| Data Logging | Code Shadowing |
|
Use Scenario: Recording sensor readings in battery-powered environmental monitors operating for years between maintenance. IC Role / Device Role / Timing Role: High-endurance flash storage with wear-leveling support via flexible erase granularity. Use Value: 100,000 P/E cycles and 20-year retention ensure reliable multi-year logging without data loss. |
Use Scenario: Executing application code directly from flash in microcontrollers lacking sufficient internal RAM. IC Role / Device Role / Timing Role: High-speed serial memory providing zero-wait-state instruction fetch via continuous read mode. Use Value: E8H/0BH continuous read eliminates address overhead, sustaining >8 MB/s throughput for deterministic code execution. |
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; fixed 256-byte pages; no sector lockdown or unique ID | Lacks concurrent buffer operation and hardware security features; requires software-managed wear leveling | Choose for cost-sensitive designs where high-speed read-only access suffices and security is handled externally |
| Macronix MX25L8006EM1I-12G | 8 Mbit SPI NOR flash; 80 MHz max clock; no dual buffers; no factory-configurable page size; no security register | Supports standard SPI but lacks RapidS optimizations and dedicated security registers | Prefer when legacy SPI controller compatibility is prioritized over advanced buffering or secure storage capabilities |
Compared with W25Q80DVSSIG and MX25L8006EM1I-12G, the AT45DB081D-SSU-SL955 delivers unique value through its dual-buffer architecture enabling true overlap of I/O and flash programming, factory-configurable page size for EEPROM emulation, and integrated hardware security - making it optimal for secure, real-time embedded firmware and logging systems where latency, endurance, and tamper resistance are critical.
Availability
AT45DB081D-SSU-SL955 is available at Aetrix Electronics and suitable for industrial control firmware storage, secure boot code deployment, and battery-powered data logging applications requiring stable component supply across extended product lifecycles.
Supply support for AT45DB081D-SSU-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, a Renesas company) specialized in low-power, high-reliability nonvolatile memory and analog ICs for industrial and IoT applications.
The AT45DB081D belongs to the DataFlash® family, designed specifically for embedded systems needing SPI-compatible flash with enhanced flexibility in page sizing, buffering, and security - bridging the gap between traditional NOR flash and EEPROM in resource-constrained environments.
FAQ
What is the maximum clock frequency supported by the AT45DB081D-SSU-SL955 for continuous array read operations?
The AT45DB081D-SSU-SL955 supports up to 66 MHz for continuous array read using opcodes E8H and 0BH, as specified by the fCAR1 parameter. This enables sustained data throughput exceeding 8 MB/s. The 03H low-frequency mode supports up to 33 MHz without dummy byte overhead. All timing values are guaranteed across the industrial temperature range (–40°C to +85°C) and 2.5V–3.6V supply.
Does the AT45DB081D-SSU-SL955 require high-voltage programming or external charge pumps?
No, the AT45DB081D-SSU-SL955 performs all program and erase operations using only its standard 2.5V–3.6V supply voltage - no external high-voltage generators or charge pumps are needed. Internal circuitry handles voltage boosting, simplifying system design and reducing bill-of-materials count. This feature is explicitly confirmed in the device description and electrical characteristics section of the official datasheet (3596P–DFLASH–2/2014).
How does the dual-buffer architecture of the AT45DB081D-SSU-SL955 improve system performance?
The AT45DB081D-SSU-SL955 integrates two independent 256-/264-byte SRAM buffers that operate concurrently with main memory programming. While one buffer receives incoming data via SI, the other can be written to flash - eliminating idle time between data reception and storage. This pipelining reduces effective write latency by up to 100% in streaming applications such as firmware updates or sensor logging, as verified in the "Buffer Write" and "Buffer to Main Memory Page Program" sections of the datasheet.
Can the AT45DB081D-SSU-SL955 be used for EEPROM emulation, and what is required to implement it?
Yes, the AT45DB081D-SSU-SL955 supports robust EEPROM emulation via its built-in three-step read-modify-write operation, enabled by the dual-buffer architecture and page-level granularity. To implement byte-level writes, firmware must manage logical-to-physical address mapping, wear leveling across pages, and atomic update sequences - all feasible due to the device's 100,000 program/erase cycles per page and self-timed operations. No external components are required beyond standard SPI interfacing.
What security features does the AT45DB081D-SSU-SL955 provide, and how are they implemented?
The AT45DB081D-SSU-SL955 provides hardware-based security including individual sector protection, sector lockdown (preventing further writes/erases), a 128-byte security register (64-byte user-programmable + 64-byte unique device ID), and independent WP pin control. Sector lockdown persists through power cycles and cannot be reversed without physical device replacement. These features are implemented in silicon and documented in the "Security" and "Sector Protection Register" sections of the datasheet (3596P–DFLASH–2/2014), ensuring tamper-resistant storage for keys and boot code.
AT45DB081D-SSU-SL955 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-SSU-SL955 FAQ
1.How can I place an order for AT45DB081D-SSU-SL955 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB081D-SSU-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-SSU-SL955 reliable?
The price and inventory of AT45DB081D-SSU-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-SSU-SL955 is usually 5 days.
3.What payment methods are accepted for AT45DB081D-SSU-SL955?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB081D-SSU-SL955 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB081D-SSU-SL955?
AT45DB081D-SSU-SL955 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB081D-SSU-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-SSU-SL955?
For technical support, including AT45DB081D-SSU-SL955 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB081D-SSU-SL955 requirements.
6.How does Aetrix verify that AT45DB081D-SSU-SL955 is sourced from the original manufacturer or authorized distributors?
All AT45DB081D-SSU-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-SSU-SL955 meets industry standards.
7.What is the process for return or replacement of AT45DB081D-SSU-SL955?
All AT45DB081D-SSU-SL955 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB081D-SSU-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-SSU-SL955 part is unused and in its original packaging.
Return procedure for AT45DB081D-SSU-SL955:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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