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Renesas AT45DB081D-SSU-SL954
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- Part No.:
- AT45DB081D-SSU-SL954
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT45DB081D-SSU-SL954.pdf
- Description:
- IC FLASH 8MBIT SPI 66MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,780
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Product details
Overview
AT45DB081D-SSU-SL954 from Adesto Technologies is an 8 Mbit serial DataFlash memory IC with RapidS™ SPI-compatible interface, 256/264-byte configurable page size, dual 256-/264-byte SRAM buffers, and industrial temperature support. It delivers up to 66 MHz read throughput for code shadowing and firmware storage in embedded systems.
For engineers reviewing the AT45DB081D-SSU-SL954 datasheet, AT45DB081D-SSU-SL954 pinout, AT45DB081D-SSU-SL954 application, or AT45DB081D-SSU-SL954 equivalent, key selection criteria include page-size flexibility (256 vs. 264 bytes), buffer-assisted concurrent read/write capability, sector-level hardware write protection, and 100,000 program/erase cycles per page.
Technical Context
The AT45DB081D-SSU-SL954 implements a sequential-access Flash architecture using a 3-wire SPI interface (CS, SCK, SI/SO) with modes 0 and 3 compatibility. Its memory is organized as 4,096 pages of either 256 or 264 bytes, backed by two independent SRAM buffers enabling simultaneous data reception and Flash reprogramming.
It supports four erase granularities - page (256 B), block (2 KB), sector (64 KB), and chip (8 Mbit) - all self-timed and controlled via opcode-based commands. Hardware write protection via the WP pin operates independently of software sector lockdown and security register configuration.
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) |
| 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 domains |
| Active Read Current | 7 mA typical - supports low-power boot-time code fetch and streaming applications |
| Standby / Deep PD Current | 25 µA / 15 µA typical - extends battery life in always-on or sleep-mode systems |
| Endurance & Retention | 100,000 program/erase cycles per page; 20-year data retention at industrial temperature |
| Security Features | 128-byte security register (64-byte user programmable + 64-byte unique device ID) |
Pinout & Package
AT45DB081D-SSU-SL954 is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with standard lead pitch and RoHS-compliant green finish. The package provides full signal access without thermal pad requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates command sequence on high-to-low transition; places SO in high-Z when deasserted |
| SCK | Serial Clock | Clocks data in/out; SI latched on rising edge, SO driven on falling edge - ensures deterministic timing for SPI mode 0/3 |
| SI | Serial Input | Accepts opcodes, addresses, and data; MSB-first protocol supports unified command/address/data framing |
| SO | Serial Output | Drives read data; tri-stated when CS is high - eliminates bus contention in multi-device SPI configurations |
| WP | Write Protect | Hardware lockout: low state blocks program/erase on protected sectors regardless of software settings |
| RESET | Reset Input | Active-low hard reset; terminates ongoing operations and returns internal state machine to idle |
| VCC | Power Supply | 2.5 V or 2.7–3.6 V input; powers core logic and Flash array - no external high-voltage programming required |
| GND | Ground Reference | System ground return path; decoupling near VCC is required for stable high-speed operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 256-/264-byte buffers enable seamless background reprogramming while streaming new data into the other buffer |
| Configurable Page Size | User-selectable 256-byte (power-of-2) or 264-byte (DataFlash standard) page format - simplifies EEPROM emulation and alignment-sensitive firmware updates |
| Continuous Array Read | Single-command, wrap-around sequential read across entire 8 Mbit array - eliminates address overhead for boot code shadowing |
| Multi-Level Erase Granularity | Page (256 B), block (2 KB), sector (64 KB), and chip (8 Mbit) erase options - optimizes wear leveling and minimizes update latency in field-upgradable systems |
| Hardware + Software Protection | Independent WP pin control plus sector lockdown and 128-byte security register - meets secure boot and IP protection requirements |
Applications
| Firmware Storage | Secure Boot Loader |
|---|---|
|
Use Scenario: Storing microcontroller firmware images in resource-constrained IoT edge nodes requiring field updates over low-bandwidth links. IC Role / Device Role / Timing Role: Nonvolatile code storage with rapid sequential read capability for XIP (execute-in-place) or fast copy-to-RAM boot sequences. Use Value: 66 MHz Continuous Array Read enables sub-100 ms firmware load times; dual buffers allow background OTA image validation while maintaining runtime execution. |
Use Scenario: Authenticating and loading signed bootloader code in automotive ECUs where tampering resistance is critical. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for cryptographic keys and verified bootloader binaries with hardware-enforced write lock. Use Value: Sector lockdown + 64-byte unique device ID prevents cloning; WP pin ensures bootloader sector remains immutable during runtime firmware updates. |
| Data Logging | Audio Voice Recording |
|
Use Scenario: Cyclic logging of sensor telemetry in industrial monitoring gateways operating unattended for months. IC Role / Device Role / Timing Role: High-endurance, low-power nonvolatile buffer for time-stamped measurements before batch upload to cloud. Use Value: 100,000 P/E cycles per page and 15 µA deep power-down current extend operational lifetime beyond 10 years in duty-cycled deployments. |
Use Scenario: Storing compressed voice prompts and alarm tones in medical alert devices with strict audio fidelity and latency requirements. IC Role / Device Role / Timing Role: Low-noise, deterministic-access memory for real-time playback without CPU intervention or DMA stalls. Use Value: No address setup overhead in Continuous Array Read mode ensures glitch-free audio streaming at 8–16 kHz sampling rates. |
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; fixed 256-byte pages; no SRAM buffers; no hardware WP pin; 104 MHz max clock | Lacks concurrent buffer operation and sector-level hardware write protection; requires software-managed erase scheduling | Choose for cost-sensitive designs needing higher clock speed but tolerating longer erase latency and no hardware security lock. |
| Microchip SST26VF064B-104I/MF | 64 Mbit HyperFlash-compatible; octal DTR interface; 133 MHz; no built-in buffers; 100K endurance | Higher density and bandwidth, but incompatible pinout/interface; requires different controller driver stack | Choose only when migrating to higher-density, faster-read applications with compatible HyperBus host interface. |
Compared with AT45DB081D-SSU-SL954, W25Q80DVSSIG offers higher clock rate but lacks dual-buffer concurrency and hardware write protection, while SST26VF064B demands interface redesign and provides no functional equivalence for legacy DataFlash-based firmware architectures.
Availability
AT45DB081D-SSU-SL954 is available at Aetrix Electronics and suitable for firmware storage, secure boot loader implementation, data logging, and audio voice recording applications requiring stable component supply, long-term lifecycle support, and industrial-grade reliability.
Supply support for AT45DB081D-SSU-SL954 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, Renesas Electronics) specialized in low-power, high-reliability serial Flash and nonvolatile memory solutions for industrial and IoT applications.
The AT45DB081D belongs to the DataFlash® family, designed specifically for embedded systems requiring efficient code shadowing, EEPROM-like byte-alterability via buffer-based read-modify-write, and robust data integrity under extended temperature and power cycling.
FAQ
What is the maximum clock frequency supported by AT45DB081D-SSU-SL954 for continuous read operations?
The AT45DB081D-SSU-SL954 supports up to 66 MHz for Continuous Array Read using opcodes E8H (legacy) and 0BH (high-frequency mode), as specified by the fCAR1 parameter. This enables high-throughput code shadowing and streaming without address retransmission overhead. The 03H low-frequency mode supports up to 33 MHz without dummy byte insertion.
Does AT45DB081D-SSU-SL954 support both 256-byte and 264-byte page sizes, and how is the selection made?
Yes, AT45DB081D-SSU-SL954 supports both 256-byte (power-of-2) and 264-byte (DataFlash standard) page formats. The page size is factory-configurable and fixed per unit; it cannot be changed in-system. The selected format determines address bit mapping (A19–A0 vs. PA11–PA0 + BA8–BA0) and buffer addressing (BFA7–BFA0 vs. BFA8–BFA0).
How does the dual-buffer architecture of AT45DB081D-SSU-SL954 improve system performance?
The AT45DB081D-SSU-SL954 integrates two independent 256-/264-byte SRAM buffers that operate concurrently with main memory programming. This allows new data to be loaded into one buffer while the other buffer's contents are being written to Flash - eliminating idle CPU time and enabling true pipelined data acquisition and storage in real-time applications.
Can AT45DB081D-SSU-SL954 be used for EEPROM emulation, and what is required to implement it?
Yes, AT45DB081D-SSU-SL954 supports EEPROM emulation via a self-contained three-step read-modify-write operation using its SRAM buffers. To implement byte- or bit-level alterability, the host must read a page into a buffer, modify desired bytes, then execute Buffer-to-Main-Memory Page Program - all without external RAM or complex wear-leveling firmware.
What protection mechanisms does AT45DB081D-SSU-SL954 provide against unauthorized writes or erases?
AT45DB081D-SSU-SL954 provides layered protection: (1) hardware WP pin - low state blocks program/erase on protected sectors regardless of software state; (2) software-controlled Sector Protection Register; (3) Sector Lockdown - permanently disables further modification of protection bits; and (4) 128-byte security register with 64-byte unique device ID for authentication binding.
AT45DB081D-SSU-SL954 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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-SL954 FAQ
1.How can I place an order for AT45DB081D-SSU-SL954 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB081D-SSU-SL954 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-SL954 reliable?
The price and inventory of AT45DB081D-SSU-SL954 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-SL954 is usually 5 days.
3.What payment methods are accepted for AT45DB081D-SSU-SL954?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB081D-SSU-SL954 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB081D-SSU-SL954?
AT45DB081D-SSU-SL954 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB081D-SSU-SL954 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-SL954?
For technical support, including AT45DB081D-SSU-SL954 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB081D-SSU-SL954 requirements.
6.How does Aetrix verify that AT45DB081D-SSU-SL954 is sourced from the original manufacturer or authorized distributors?
All AT45DB081D-SSU-SL954 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-SL954 meets industry standards.
7.What is the process for return or replacement of AT45DB081D-SSU-SL954?
All AT45DB081D-SSU-SL954 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB081D-SSU-SL954, 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-SL954 part is unused and in its original packaging.
Return procedure for AT45DB081D-SSU-SL954:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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