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Renesas AT45DB321D-MU-SL954
- Part No.:
- AT45DB321D-MU-SL954
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
AT45DB321D-MU-SL954.pdf
- Description:
- IC FLASH 32MBIT SPI 66MHZ 8VDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,290
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Product details
Overview
AT45DB321D-MU-SL954 from Microchip Technology (formerly Atmel) is a 32Mb serial DataFlash memory IC with SPI-compatible RapidS interface, 512/528-byte configurable page size, dual 512/528-byte SRAM buffers, and industrial temperature support. It enables high-speed code shadowing and in-system reprogrammability in embedded controllers and audio/image storage systems.
For engineers reviewing the AT45DB321D-MU-SL954 datasheet, AT45DB321D-MU-SL954 pinout, AT45DB321D-MU-SL954 application, or AT45DB321D-MU-SL954 equivalent, key selection criteria include 66MHz max clock frequency, flexible erase granularity (page/block/sector/chip), hardware write protection, 100,000 program/erase cycles, and JEDEC-compliant ID read capability.
Technical Context
The AT45DB321D-MU-SL954 implements a sequential-access flash architecture with two independent SRAM buffers that support concurrent data reception and flash reprogramming. Its RapidS interface operates in SPI Mode 0 or Mode 3 at up to 66MHz, eliminating address bus overhead and reducing pin count versus parallel NOR/NAND.
Memory organization comprises 8,192 pages of 512 or 528 bytes each, partitioned into 64 sectors with variable sub-division (e.g., Sector 0a = 8 pages, Sector 0b = 120 pages). Erase operations are fully self-timed and supported at page (512B), block (4KB), sector (64KB), and chip (32Mb) levels - all without external high-voltage programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32Mb (34,603,008 bits), organized as 8,192 × 512/528-byte pages |
| Interface Speed | Up to 66MHz SCK for continuous array read (0BH/E8H opcodes); supports SPI Modes 0 & 3 |
| Supply Voltage | 2.5V–3.6V or 2.7V–3.6V single supply - no high-voltage programming required |
| Power Consumption | 7mA typical active read current; 25µA standby; 15µA deep power-down |
| Erase Endurance | ≥100,000 program/erase cycles per page; 20-year data retention |
| Security Features | 128-byte security register (64-byte user programmable + 64-byte unique device ID) |
| Operating Temp | Industrial range: –40°C to +85°C |
Pinout & Package
AT45DB321D-MU-SL954 is packaged in an 8-pin MLF (VDFN) with exposed thermal pad (floating or GND-connected). Pin functions align with standard SPI+control interface for minimal board routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates command sequence on high-to-low transition; deassertion places SO in high-Z and enters standby mode |
| SCK | Serial Clock | Controls data timing: SI latched on rising edge; SO driven on falling edge |
| SI | Serial Input | Carries opcodes, addresses, and input data; MSB-first protocol |
| SO | Serial Output | Outputs read data, status, or ID; tri-stated when CS is high |
| WP | Write Protect | Hardware lock: low state blocks program/erase on protected sectors regardless of software settings |
| RESET | Reset | Active-low aborts ongoing operation and resets internal state machine; internal POR eliminates external reset circuit need |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output pulled high externally; driven low during self-timed operations (program/erase/buffer transfer) |
| VCC / GND | Power Supply | Single 2.5–3.6V supply; GND serves as reference for all I/O and internal logic |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 512/528-byte buffers enable simultaneous data streaming and flash reprogramming - critical for real-time firmware updates |
| Configurable Page Size | Factory-set 512-byte (power-of-two) or 528-byte (standard DataFlash) page size - optimizes alignment for legacy EEPROM emulation or binary file storage |
| Continuous Array Read | Zero-overhead sequential read across page boundaries and full memory wrap-around - ideal for boot code shadowing without address management |
| Sector Lockdown | Individual sector write-protection via hardware WP pin and software-controlled sector protection register - secures bootloader or calibration data against accidental overwrite |
| JEDEC ID Support | Standard manufacturer (0x1F) and device (0x26) ID read - enables automated BOM verification and multi-vendor firmware compatibility checks |
Applications
| Audio Playback Systems | Firmware Storage for MCU |
|---|---|
Use Scenario: Storing compressed voice prompts or music samples in portable medical devices or industrial HMI units. IC Role / Device Role / Timing Role: Nonvolatile sequential data buffer with rapid streaming read capability and low-power standby. Use Value: Enables continuous playback from flash without CPU intervention using E8H/0BH continuous read mode at up to 66MHz. | Use Scenario: Holding boot code and field-upgradable firmware images for ARM Cortex-M or RISC-V microcontrollers. IC Role / Device Role / Timing Role: External program memory supporting in-system reprogramming via SPI without high-voltage circuitry. Use Value: Dual-buffer architecture allows new firmware to be loaded into one buffer while executing from flash, enabling atomic updates. |
| Image Capture Devices | Secure Configuration Storage |
Use Scenario: Buffering raw sensor frames in digital endoscopes or thermal imaging modules before compression/transmission. IC Role / Device Role / Timing Role: High-bandwidth temporary storage with deterministic erase latency (tPE ≤ 15ms for page erase). Use Value: 64KB sector erase clears entire image buffer in one command - faster than 128 individual page erases. | Use Scenario: Storing encrypted keys, calibration coefficients, and device-specific identifiers in payment terminals or IoT gateways. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile storage with hardware write protection and unique 64-byte device ID. Use Value: Sector lockdown + 128-byte security register prevents unauthorized modification of cryptographic assets during field deployment. |
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-wire interface (IO0–IO3); no dual SRAM buffers; 133MHz QPI mode | Lacks continuous read wrap-around and buffer-assisted streaming; requires different driver stack for quad mode | Choose for higher random read speed and smaller package (8-SOIC), but expect firmware changes for command set and buffer management |
| Macronix MX25L3233FZNI-10G | 32Mb standard SPI NOR flash; no configurable page size; no SRAM buffers; 104MHz max clock | No built-in EEPROM emulation support; lacks sector lockdown and security register | Select when cost sensitivity outweighs advanced features like dual buffering and secure storage - suitable for basic code storage only |
Compared with W25Q32JVSSIQ and MX25L3233FZNI-10G, the AT45DB321D-MU-SL954 delivers unique value in streaming-intensive applications through its dual-buffer architecture and seamless continuous read, while offering stronger security primitives for certified embedded deployments.
Availability
AT45DB321D-MU-SL954 is available at Aetrix Electronics and suitable for audio playback systems, firmware storage for MCU, image capture devices, and secure configuration storage requiring stable component supply and long-term industrial lifecycle support.
Supply support for AT45DB321D-MU-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 full support for the DataFlash product line. The company specializes in microcontrollers, analog, FPGA, and memory solutions for industrial, automotive, and communications markets.
The AT45DB321D-MU-SL954 belongs to the Atmel DataFlash family, designed specifically for high-reliability, low-pin-count serial flash applications where sequential access, buffer-assisted streaming, and integrated security are essential - not general-purpose NOR/NAND replacement.
FAQ
What is the maximum clock frequency supported by AT45DB321D-MU-SL954 for continuous array read?
The AT45DB321D-MU-SL954 supports up to 66MHz for continuous array read using opcodes 0BH (high-frequency mode) and E8H (legacy mode), as specified by fCAR1 in the datasheet. This applies to both 512-byte and 528-byte page configurations and enables sustained data throughput without address overhead or page boundary delays.
Does AT45DB321D-MU-SL954 require external high-voltage programming?
No, the AT45DB321D-MU-SL954 operates entirely from a single 2.5V–3.6V supply for all read, program, and erase operations. All programming and erase cycles are internally self-timed, eliminating the need for external VPP generators or charge pumps - simplifying system design and improving reliability.
How does the dual-buffer architecture of AT45DB321D-MU-SL954 improve system performance?
The AT45DB321D-MU-SL954's two independent 512/528-byte SRAM buffers allow simultaneous data reception via SI while reprogramming flash pages. This enables uninterrupted streaming - for example, loading new firmware into one buffer while executing from flash - reducing update latency and avoiding CPU stalls during writes.
Can AT45DB321D-MU-SL954 emulate EEPROM functionality?
Yes, the AT45DB321D-MU-SL954 supports EEPROM emulation through a self-contained three-step read-modify-write operation. Its configurable page size (512 or 528 bytes) and page-level erase capability allow efficient byte- or word-level updates without requiring full-sector erasure - matching EEPROM behavior in resource-constrained embedded systems.
What package type is used for AT45DB321D-MU-SL954, and is thermal pad connection required?
The AT45DB321D-MU-SL954 uses an 8-pin MLF (VDFN) package (MU suffix) with an exposed metal pad on the bottom. The pad is electrically floating by default and may be left unconnected or tied to GND for improved thermal dissipation - no mandatory connection is required for functional operation per the datasheet.
AT45DB321D-MU-SL954 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- 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-VDFN (6x5)
AT45DB321D-MU-SL954 FAQ
1.How can I place an order for AT45DB321D-MU-SL954 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321D-MU-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-MU-SL954 reliable?
The price and inventory of AT45DB321D-MU-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-MU-SL954 is usually 5 days.
3.What payment methods are accepted for AT45DB321D-MU-SL954?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321D-MU-SL954 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321D-MU-SL954?
AT45DB321D-MU-SL954 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321D-MU-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-MU-SL954?
For technical support, including AT45DB321D-MU-SL954 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321D-MU-SL954 requirements.
6.How does Aetrix verify that AT45DB321D-MU-SL954 is sourced from the original manufacturer or authorized distributors?
All AT45DB321D-MU-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-MU-SL954 meets industry standards.
7.What is the process for return or replacement of AT45DB321D-MU-SL954?
All AT45DB321D-MU-SL954 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321D-MU-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-MU-SL954 part is unused and in its original packaging.
Return procedure for AT45DB321D-MU-SL954:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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