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Renesas AT45DB321D-SU-SL954
- Part No.:
- AT45DB321D-SU-SL954
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DB321D-SU-SL954.pdf
- Description:
- IC FLASH 32MBIT SPI 66MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,426
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Product details
Overview
AT45DB321D-SU-SL954 from Microchip Technology (acquired Atmel) is a 32Mb serial DataFlash memory IC with SPI-compatible RapidS interface, 512/528-byte page architecture, dual 512/528-byte SRAM buffers, and industrial temperature support. It operates from a single 2.5V–3.6V supply, delivers up to 66MHz read throughput, and enables continuous array reads ideal for code shadowing in embedded systems.
For engineers reviewing the AT45DB321D-SU-SL954 datasheet, AT45DB321D-SU-SL954 pinout, AT45DB321D-SU-SL954 application, or AT45DB321D-SU-SL954 equivalent, key selection criteria include page-size configurability (512 vs. 528 bytes), hardware write protection via WP pin, RDY/BUSY open-drain status signaling, and sector lockdown for secure firmware storage.
Technical Context
The AT45DB321D-SU-SL954 implements a sequential-access flash architecture with two independent 512/528-byte SRAM buffers enabling simultaneous receive-and-reprogram operation. Its RapidS serial interface supports SPI modes 0 and 3 at up to 66MHz, with three distinct continuous read commands (03H, 0BH, E8H) differentiated by dummy byte requirements and max clock limits (33MHz vs. 66MHz).
Memory organization comprises 8,192 pages of 512 or 528 bytes each, grouped into 64 sectors (two 8-page sub-sectors + sixty-two 128-page sectors), supporting page (512B), block (4KB), sector (64KB), and full-chip (32Mb) erase granularity. All program/erase operations are self-timed and require no external high-voltage supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 32Mb (4MB) organized as 8,192 × 512/528-byte pages |
| Supply voltage | 2.5V–3.6V single supply; no high-VPP required for programming |
| Interface speed | Up to 66MHz SCK for continuous reads (0BH/E8H); 33MHz for legacy 03H mode |
| Page size | User-configurable: factory-set 512 bytes or 528 bytes per page |
| SRAM buffers | Two independent 512/528-byte buffers enabling concurrent data streaming and reprogramming |
| Erase endurance | 100,000 program/erase cycles per page minimum |
| Data retention | 20 years at industrial temperature range (−40°C to +85°C) |
Pinout & Package
AT45DB321D-SU-SL954 is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with gull-wing leads, RoHS-compliant, and rated for industrial temperature operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates command sequence on falling edge, terminates on rising edge; places SO in high-Z when deasserted |
| SCK | Serial Clock | Controls data timing; SI latched on rising edge, SO driven on falling edge |
| SI | Serial Input | Unidirectional command/address/data input path; MSB-first protocol |
| SO | Serial Output | Unidirectional data output path; tri-stated when CS is high |
| WP | Write Protect | Hardware-level sector lockout; low-active; overrides software protection when asserted |
| RESET | Reset | Active-low hard reset; terminates ongoing operation and returns state machine to idle |
| RDY/BUSY | Ready/Busy Status | Open-drain output; pulled low during self-timed operations (program/erase/buffer transfers) |
| VCC / GND | Power / Ground | Single 2.5V–3.6V supply; internal power-on reset eliminates external reset circuitry requirement |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM buffers | Enables pipelined operation: receive new data into one buffer while programming flash from the other |
| Continuous array read | Eliminates address retransmission overhead; wraps seamlessly across page and array boundaries |
| Sector lockdown | Per-sector hardware write-protection enforced independently of WP pin state for secure boot code storage |
| 128-byte security register | Contains 64-byte user-programmable space + unique 64-byte device ID for firmware authentication |
| Flexible erase hierarchy | Supports granular updates (page), bulk rewrites (block/sector), or full-field recovery (chip erase) |
Applications
| Firmware Storage | Audio Buffering |
|---|---|
Use Scenario: Storing bootloader, FPGA configuration bitstreams, or field-upgradable firmware images in microcontroller-based edge devices. IC Role / Device Role / Timing Role: Nonvolatile code storage with rapid sequential read capability and hardware-secured sector lockdown. Use Value: Enables secure over-the-air updates without requiring external ECC or redundant storage; 66MHz read speed reduces boot latency. | Use Scenario: Real-time audio playback/recording in voice-enabled IoT nodes using continuous stream buffering. IC Role / Device Role / Timing Role: High-throughput sequential data buffer with seamless page-wrap behavior during streaming. Use Value: Dual-buffer architecture allows uninterrupted audio capture while background flash writes occur-no audio dropouts or jitter. |
| Industrial HMI Logging | Medical Device Data Archiving |
Use Scenario: Recording sensor timestamps, alarm events, and operator actions in human-machine interface panels. IC Role / Device Role / Timing Role: Reliable long-term data logger with sector-level erase control and 20-year retention. Use Value: Page- and block-erase options minimize wear on frequently updated log segments; deep power-down current (15μA) extends battery life. | Use Scenario: Storing calibrated sensor calibration tables and patient session logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, traceable, and tamper-evident nonvolatile storage with unique device ID and programmable security register. Use Value: 64-byte device identifier enables audit-trail binding; sector lockdown prevents unauthorized modification of calibration data. |
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 W25Q32JVSSIQ | 32Mb Quad SPI NOR flash; 4-line I/O; no dual SRAM buffers; 133MHz QPI mode | Lacks continuous-read optimization and buffer-assisted streaming; better for random-access code XIP | Select when system requires execute-in-place (XIP) or higher random read bandwidth; not suitable for streaming-centric use cases |
| Macronix MX25L3233FZNI-10G | 32Mb standard SPI NOR flash; no configurable page size; no SRAM buffers; 104MHz max clock | No built-in buffer-to-flash transfer acceleration; relies on host-managed wear leveling | Choose for cost-sensitive designs where streaming concurrency and sector lockdown are not required |
Compared with W25Q32JVSSIQ and MX25L3233FZNI-10G, the AT45DB321D-SU-SL954 uniquely combines dual SRAM buffers, page-size flexibility, and hardware-enforced sector lockdown-making it optimal for streaming, secure firmware, and deterministic real-time logging where concurrent access and data integrity are critical.
Availability
AT45DB321D-SU-SL954 is available at Aetrix Electronics and suitable for firmware storage, audio buffering, industrial HMI logging, and medical device data archiving requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT45DB321D-SU-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
Microchip Technology acquired Atmel in 2016 and maintains the DataFlash product line, emphasizing high-reliability serial flash solutions for industrial and automotive applications.
The AT45DB321D-SU-SL954 belongs to the Atmel DataFlash family, designed specifically for sequential-access, streaming-oriented applications where low pin count, deterministic timing, and integrated buffer acceleration outperform conventional NOR/NAND architectures.
FAQ
What is the maximum clock frequency supported by AT45DB321D-SU-SL954 for continuous array reads?
The AT45DB321D-SU-SL954 supports up to 66MHz for continuous array reads using opcodes 0BH and E8H, and up to 33MHz using opcode 03H. These frequencies are defined by the fCAR1 and fCAR2 specifications respectively, and apply regardless of whether the page size is configured for 512 or 528 bytes. The device's RapidS interface ensures stable timing margins at these speeds under industrial temperature conditions.
Does AT45DB321D-SU-SL954 require external high-voltage circuitry for programming?
No, the AT45DB321D-SU-SL954 performs all program and erase operations using only its standard 2.5V–3.6V supply rail-no external VPP or charge pump circuitry is needed. This simplifies board design, reduces component count, and improves reliability. All internal timing for programming and erasing is fully self-contained and automatically managed by the device's internal state machine.
How does the dual-buffer architecture of AT45DB321D-SU-SL954 improve system throughput?
The AT45DB321D-SU-SL954's two independent 512/528-byte SRAM buffers allow a host processor to load new data into one buffer while simultaneously programming the contents of the other buffer into flash memory. This pipelining eliminates idle time between data reception and storage, enabling true continuous data streaming-critical for real-time audio, sensor logging, and firmware update scenarios.
Can AT45DB321D-SU-SL954 be used as a direct replacement for standard SPI NOR flash in existing designs?
The AT45DB321D-SU-SL954 is not a pin-compatible or functional drop-in replacement for standard SPI NOR flash due to architectural differences: it uses sequential-access addressing (not random-access), requires different command opcodes, and relies on buffer-based programming. Migration requires firmware changes to accommodate RapidS protocol, page-size handling, and buffer management-but delivers tangible benefits in streaming efficiency and security features.
What security mechanisms does AT45DB321D-SU-SL954 provide for protecting stored firmware?
The AT45DB321D-SU-SL954 provides multiple hardware-enforced security layers: a 128-byte security register (64-byte user space + 64-byte unique device ID), individual sector lockdown that persists through power cycles, and independent hardware write protection via the WP pin. These features operate autonomously-no host CPU intervention is required to maintain protection once configured, making them ideal for secure boot and anti-tampering applications.
AT45DB321D-SU-SL954 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 32Mbit
- Memory Organization:
- 512 Bytes x 8192 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 66 MHz
- Write Cycle Time - Word, Page:
- 6ms
- 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
AT45DB321D-SU-SL954 FAQ
1.How can I place an order for AT45DB321D-SU-SL954 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321D-SU-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 AT45DB321D-SU-SL954 reliable?
The price and inventory of AT45DB321D-SU-SL954 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB321D-SU-SL954 is usually 5 days.
3.What payment methods are accepted for AT45DB321D-SU-SL954?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321D-SU-SL954 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321D-SU-SL954?
AT45DB321D-SU-SL954 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321D-SU-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 AT45DB321D-SU-SL954?
For technical support, including AT45DB321D-SU-SL954 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321D-SU-SL954 requirements.
6.How does Aetrix verify that AT45DB321D-SU-SL954 is sourced from the original manufacturer or authorized distributors?
All AT45DB321D-SU-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 AT45DB321D-SU-SL954 meets industry standards.
7.What is the process for return or replacement of AT45DB321D-SU-SL954?
All AT45DB321D-SU-SL954 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321D-SU-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 AT45DB321D-SU-SL954 part is unused and in its original packaging.
Return procedure for AT45DB321D-SU-SL954:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB321D-SU-SL954 Tags
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