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Renesas AT45DB321D-MU-2.5-SL383
- Part No.:
- AT45DB321D-MU-2.5-SL383
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
AT45DB321D-MU-2.5-SL383.pdf
- Description:
- IC FLASH 32MBIT SPI 50MHZ 8VDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,326
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Product details
Overview
AT45DB321D-MU-2.5-SL383 from Microchip Technology (formerly Atmel) is a 32Mb serial DataFlash memory IC with SPI-compatible RapidS interface, 2.5V single-supply operation, 8,192 × 512/528-byte pages, and dual 512/528-byte SRAM buffers. It enables high-speed code shadowing and in-system reprogrammability in embedded controllers and firmware storage applications.
For engineers reviewing the AT45DB321D-MU-2.5-SL383 datasheet, AT45DB321D-MU-2.5-SL383 pinout, AT45DB321D-MU-2.5-SL383 application, or AT45DB321D-MU-2.5-SL383 equivalent, key selection criteria include page size configurability (512 vs. 528 bytes), 66MHz max clock frequency, hardware write protection (WP), RDY/BUSY signaling, and industrial temperature support.
Technical Context
The AT45DB321D-MU-2.5-SL383 implements a sequential-access flash architecture with two independent SRAM buffers, enabling concurrent data reception and flash reprogramming. Its RapidS interface supports SPI modes 0 and 3 at up to 66MHz, and all program/erase operations are internally self-timed.
Memory organization comprises 8,192 pages (512 or 528 bytes each), grouped into 64 sectors with flexible erase granularity-page (512B), block (4KB), sector (64KB), or chip (32Mb). A 128-byte security register includes 64-byte user-programmable space and a unique 64-byte device identifier.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 32Mb (34,603,008 bits), organized as 8,192 pages |
| Page size | Factory-configurable 512 bytes or 528 bytes per page |
| Interface speed | Up to 66MHz clock (RapidS SPI mode 0/3) |
| Supply voltage | 2.5V ±0.2V single supply - no VPP required for programming |
| Power consumption | 7mA typical active read current; 25µA standby; 15µA deep power-down |
| Data retention | 20 years minimum at industrial temperature range (–40°C to +85°C) |
| Endurance | 100,000 program/erase cycles per page |
Pinout & Package
AT45DB321D-MU-2.5-SL383 uses an 8-pin MLF (VDFN) package (3×4 mm, 0.5 mm pitch) with exposed thermal pad (floating or GND-connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates command sequence on falling edge, terminates on rising edge |
| SCK | Serial Clock | Controls data timing; SI latched on rising edge, SO output on falling edge |
| SI | Serial Input | Command, address, and data input path (MSB-first) |
| SO | Serial Output | Data output path; tri-stated when CS is high |
| WP | Write Protect | Hardware lock for sector protection; low = protection active, overrides software controls |
| RESET | Reset | Active-low hard reset; terminates ongoing operation and returns state machine to idle |
| RDY/BUSY | Ready/Busy indicator | Open-drain output pulled high externally; driven low during self-timed operations |
| VCC / GND | Power supply | 2.5V ±0.2V supply and ground reference; internal power-on reset circuit included |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM buffers | Two independent 512/528-byte buffers enable simultaneous receive-and-program operation |
| Continuous array read | Legacy (E8H), high-frequency (0BH), and low-frequency (03H) read modes support seamless code shadowing without address reload |
| Flexible erase hierarchy | Page (512B), block (4KB), sector (64KB), and chip (32Mb) erase options minimize wear and optimize update latency |
| Hardware + software protection | WP pin provides unconditional sector lockdown; 128-byte security register enables secure boot and device ID binding |
| JEDEC ID support | Standard manufacturer and device ID read simplifies automated board-level identification and firmware validation |
Applications
| Firmware Storage | Code Shadowing |
|---|---|
Use Scenario: Storing boot firmware and field-upgradable application binaries in microcontroller-based IoT edge nodes. IC Role / Device Role / Timing Role: Nonvolatile program memory accessed via SPI during cold start and OTA updates. Use Value: 2.5V operation and 100K-cycle endurance ensure reliable firmware persistence across 10+ years of deployments. | Use Scenario: Streaming executable code directly from flash into CPU instruction cache for real-time DSP execution. IC Role / Device Role / Timing Role: High-bandwidth sequential data source supporting continuous read at up to 66MHz. Use Value: Continuous array read (0BH/E8H) eliminates address overhead, enabling deterministic 8.25 MB/s throughput with zero page-boundary stalls. |
| Secure Boot Configuration | Industrial Data Logging |
Use Scenario: Storing cryptographic keys, signed firmware manifests, and immutable device identity in factory-programmed systems. IC Role / Device Role / Timing Role: Tamper-resistant configuration store with hardware WP and sector lockdown. Use Value: 128-byte security register with 64-byte user space and unique 64-byte device ID enables root-of-trust binding per unit. | Use Scenario: Buffering sensor telemetry in programmable logic controllers with periodic flash commit. IC Role / Device Role / Timing Role: Dual-buffered nonvolatile scratchpad supporting concurrent acquisition and background flash writes. Use Value: Independent buffer reads/writes during main memory programming reduce logging latency by eliminating host wait states. |
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 (QSPI), 1.8V–3.6V supply, no dual buffers, no built-in page erase | Lacks concurrent buffer access and hardware WP; requires external erase management | Preferred where QSPI bandwidth >66MHz is needed and buffer concurrency is unnecessary |
| Macronix MX25L3233FZNI-10G | 32Mb standard SPI, 2.3V–3.6V, no dual buffers, no RDY/BUSY pin, no security register | No hardware status signaling or security features; simpler command set | Selected for cost-sensitive designs requiring basic SPI flash without advanced features |
Compared with W25Q32JVSSIQ and MX25L3233FZNI-10G, the AT45DB321D-MU-2.5-SL383 uniquely delivers dual-buffer concurrency, hardware write protection, and integrated security registers - critical for secure, real-time embedded firmware storage where deterministic latency and tamper resistance are design requirements.
Availability
AT45DB321D-MU-2.5-SL383 is available at Aetrix Electronics and suitable for firmware storage, code shadowing, secure boot configuration, and industrial data logging requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT45DB321D-MU-2.5-SL383 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 product support, documentation, and manufacturing continuity for the AT45DB321D-MU-2.5-SL383.
This device belongs to the Atmel DataFlash® family, designed specifically for high-reliability, low-pin-count serial flash applications demanding concurrent buffer access, hardware security, and industrial-grade endurance.
FAQ
What is the operating voltage range for the AT45DB321D-MU-2.5-SL383?
The AT45DB321D-MU-2.5-SL383 operates from a single 2.5V ±0.2V supply - strictly 2.3V to 2.7V - and does not support 2.7V–3.6V operation. This fixed 2.5V requirement ensures compatibility with low-voltage microcontrollers and eliminates need for level-shifting in 2.5V system domains. The AT45DB321D-MU-2.5-SL383 integrates internal charge pumps for programming, so no external high-voltage supply is required.
Does the AT45DB321D-MU-2.5-SL383 support true byte-level writes like EEPROM?
No, the AT45DB321D-MU-2.5-SL383 does not support true byte-level writes. It requires page-level programming (512 or 528 bytes), but includes a self-contained three-step read-modify-write operation that emulates EEPROM behavior at the application layer. This emulation relies on the dual SRAM buffers to hold modified data before committing to flash, preserving the AT45DB321D-MU-2.5-SL383's endurance and sequential architecture while enabling bit/byte alterability in firmware.
How does the RDY/BUSY pin function during a page program operation on the AT45DB321D-MU-2.5-SL383?
During a page program operation, the RDY/BUSY pin on the AT45DB321D-MU-2.5-SL383 is actively driven low (open-drain) until completion, indicating the device is busy. This signal remains asserted for the full duration of the self-timed tEP (max 20ms) or tP (max 10ms), allowing the host to poll asynchronously without polling status registers. While RDY/BUSY is low, the main memory array is inaccessible, but reads/writes to the other SRAM buffer remain fully functional - a key capability enabled by the AT45DB321D-MU-2.5-SL383's dual-buffer architecture.
Can the page size of the AT45DB321D-MU-2.5-SL383 be changed after power-up?
No - the page size (512 bytes or 528 bytes) of the AT45DB321D-MU-2.5-SL383 is factory-configured and fixed for the lifetime of the device. It cannot be altered via command or software. The AT45DB321D-MU-2.5-SL383 datasheet specifies that this configuration is set during wafer test and permanently encoded in the device's silicon. Host firmware must be designed to match the configured page size, as address mapping (e.g., PA12–PA0 vs. A21–A0) and opcode behavior differ between the two variants.
Is the exposed metal pad on the bottom of the AT45DB321D-MU-2.5-SL383 MLF package required to be grounded?
No - the exposed metal pad on the AT45DB321D-MU-2.5-SL383 MLF (VDFN) package is electrically floating and may be left unconnected or tied to GND based on thermal and EMI requirements. Atmel's datasheet explicitly states it is a "No Connect" by default, though grounding improves thermal dissipation and reduces noise coupling. PCB layout must avoid solder wicking under the pad, and thermal vias should be used only if connected to a solid GND plane - a design choice, not a functional requirement for the AT45DB321D-MU-2.5-SL383 to operate correctly.
AT45DB321D-MU-2.5-SL383 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 32Mbit
- Memory Organization:
- 528 Bytes x 8192 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 50 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VDFN (6x5)
AT45DB321D-MU-2.5-SL383 FAQ
1.How can I place an order for AT45DB321D-MU-2.5-SL383 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321D-MU-2.5-SL383 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-2.5-SL383 reliable?
The price and inventory of AT45DB321D-MU-2.5-SL383 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-2.5-SL383 is usually 5 days.
3.What payment methods are accepted for AT45DB321D-MU-2.5-SL383?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321D-MU-2.5-SL383 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321D-MU-2.5-SL383?
AT45DB321D-MU-2.5-SL383 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321D-MU-2.5-SL383 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-2.5-SL383?
For technical support, including AT45DB321D-MU-2.5-SL383 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321D-MU-2.5-SL383 requirements.
6.How does Aetrix verify that AT45DB321D-MU-2.5-SL383 is sourced from the original manufacturer or authorized distributors?
All AT45DB321D-MU-2.5-SL383 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-2.5-SL383 meets industry standards.
7.What is the process for return or replacement of AT45DB321D-MU-2.5-SL383?
All AT45DB321D-MU-2.5-SL383 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321D-MU-2.5-SL383, 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-2.5-SL383 part is unused and in its original packaging.
Return procedure for AT45DB321D-MU-2.5-SL383:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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