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Renesas AT45DB321D-MU-SL383
- Part No.:
- AT45DB321D-MU-SL383
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
AT45DB321D-MU-SL383.pdf
- Description:
- IC FLASH 32MBIT SPI 66MHZ 8VDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,562
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Product details
Overview
AT45DB321D-MU-SL383 from Microchip Technology (formerly 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 code shadowing in embedded microcontroller systems.
For engineers reviewing the AT45DB321D-MU-SL383 datasheet, AT45DB321D-MU-SL383 pinout, AT45DB321D-MU-SL383 application, or AT45DB321D-MU-SL383 equivalent, key selection criteria include page-size configurability (512 vs. 528 bytes), buffer-assisted concurrent read/write capability, sector lockdown security, and JEDEC-compliant ID read for system identification.
Technical Context
The AT45DB321D-MU-SL383 implements a sequential-access flash architecture with two independent 512/528-byte SRAM buffers, enabling simultaneous data reception into one buffer while reprogramming a page in main memory. Its RapidS interface supports SPI modes 0 and 3 at up to 66MHz, with continuous array read bypassing buffers for zero-latency code execution.
Memory organization comprises 8,192 pages (512 or 528 bytes each), grouped into sectors (64KB), blocks (4KB), and pages (512/528B), supporting granular erase operations - page, block, sector, or full chip - all self-timed with RDY/BUSY pin indication. Sector lockdown and a 128-byte security register provide hardware-enforced data protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 32Mb (4MB) organized as 8,192 × 512/528-byte pages |
| Interface speed | Up to 66MHz SCK for continuous array read (0BH/E8H opcodes) |
| Supply voltage | 2.5V–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 minimum |
| Data retention | 20 years at industrial temperature range (–40°C to +85°C) |
| Security features | 128-byte security register (64B user-programmable + 64B unique device ID) |
Pinout & Package
AT45DB321D-MU-SL383 is packaged in an 8-pin VDFN (MLF) package (3mm × 4mm, 0.5mm pitch), with exposed metal pad floating or optionally connected to GND. Pin functions are fully compatible with SOIC-8 and TSOP-8 footprints but optimized for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates command sequence on high-to-low transition; deassertion places device in standby (SO tri-stated) |
| SCK | Serial Clock | Controls data timing; commands, addresses, and SI data latched on rising edge; SO data clocked out on falling edge |
| SI | Serial Input | Unidirectional command/address/data input path; MSB-first protocol; shared across all instructions |
| SO | Serial Output | Unidirectional data output path; supports continuous read without address reload; tri-stated when CS high |
| WP | Write Protect | Hardware-level sector lock override; low state blocks program/erase regardless of software protection status |
| RESET | Reset | Active-low hard reset; terminates ongoing operation and returns state machine to idle; internal POR eliminates external RC requirement |
| 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 2.5V–3.6V supply; decoupling recommended near VCC pin; GND reference for all I/O and core logic |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM buffers (512/528B each) | Enables pipelined operation: receive new data into one buffer while programming flash from the other - critical for real-time firmware updates |
| User-configurable page size | Factory-set to 512B (power-of-two) or 528B (standard DataFlash); determines address bit allocation and buffer addressing scheme |
| Continuous array read (E8H/0BH/03H) | Eliminates address overhead during streaming reads; wraps seamlessly across page and array boundaries - ideal for boot code shadowing |
| Sector lockdown & security register | Prevents unauthorized modification of protected sectors; 64B unique device ID enables secure device authentication in field-deployed systems |
| Flexible erase granularity | Page (512B), block (4KB), sector (64KB), or chip (32Mb) erasure - minimizes wear and optimizes update latency for partial firmware patches |
Applications
| Firmware Storage | Boot Code Shadowing |
|---|---|
Use Scenario: Storing field-upgradable firmware images in industrial PLCs and medical devices requiring long-term reliability and secure version control. IC Role / Device Role / Timing Role: Nonvolatile storage element holding signed firmware binaries; accessed via SPI during bootloader initialization or OTA update routines. Use Value: 100,000 erase cycles and 20-year data retention ensure multi-decade deployment without refresh; sector lockdown prevents corruption of critical boot sectors. |
Use Scenario: Copying executable code from flash to RAM at system startup in resource-constrained microcontrollers (e.g., ARM Cortex-M0+). IC Role / Device Role / Timing Role: Sequential-access memory providing zero-gap continuous read stream to feed instruction cache or internal SRAM. Use Value: Continuous array read (0BH/E8H) at up to 66MHz eliminates address setup delays - reduces boot time by >40% versus parallel NOR flash. |
| Data Logging Buffer | Secure Configuration Storage |
Use Scenario: Capturing sensor telemetry in battery-powered IoT edge nodes where power efficiency and write endurance are critical. IC Role / Device Role / Timing Role: High-speed serial buffer staging raw ADC samples before batch compression and transmission. Use Value: Dual SRAM buffers allow concurrent acquisition (into buffer 1) and flash write (from buffer 2), sustaining >2.5MB/s effective throughput under burst conditions. |
Use Scenario: Storing calibrated sensor offsets, cryptographic keys, and device-specific credentials in automotive ECUs and smart meters. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile storage with hardware write protection and unique device identity binding. Use Value: 128-byte security register with 64B user space + 64B immutable ID enables PKI-based provisioning and anti-cloning enforcement. |
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) interface; 4-line I/O; no dual SRAM buffers; 1.8V–3.6V supply | Lacks buffer-assisted concurrent read/write; requires QSPI controller; better suited for high-throughput code XIP than streaming data logging | Select if system uses QSPI peripheral and prioritizes read bandwidth over pipelined write flexibility |
| Macronix MX25L3233FZBI-12G | 32Mb standard SPI; 2.3V–3.6V; no configurable page size; no security register or sector lockdown | No hardware security features; fixed 256B page size limits emulation efficiency; lacks RDY/BUSY open-drain output | Select for cost-sensitive designs where security and EEPROM emulation are not required |
Compared with W25Q32JVSSIQ and MX25L3233FZBI-12G, the AT45DB321D-MU-SL383 uniquely combines dual SRAM buffers for true concurrent access, factory-configurable page size for legacy compatibility, and integrated sector lockdown - making it optimal for secure, real-time embedded firmware and data buffering where deterministic latency and tamper resistance are mandatory.
Availability
AT45DB321D-MU-SL383 is available at Aetrix Electronics and suitable for firmware storage, boot code shadowing, data logging buffer, and secure configuration storage requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AT45DB321D-MU-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 the DataFlash product line as part of its broad serial memory portfolio, emphasizing reliability, security, and ease of integration in industrial and automotive systems.
The AT45DB321D-MU-SL383 belongs to the Atmel DataFlash family, designed specifically for embedded systems needing high-density, low-pin-count, low-power serial flash with built-in buffering and hardware security - bridging the gap between traditional NOR flash and EEPROM emulation.
FAQ
What is the default page size configuration for AT45DB321D-MU-SL383?
The AT45DB321D-MU-SL383 is factory preconfigured for 512-byte pages (power-of-two mode), which simplifies address mapping and aligns with common MCU DMA and memory management units. The 528-byte mode is available via factory option or post-manufacture configuration using specific status register writes - confirmed in Section 3 of the 3597Q–DFLASH–6/11 datasheet.
Does AT45DB321D-MU-SL383 support true SPI Mode 0 and Mode 3 only?
Yes, AT45DB321D-MU-SL383 explicitly supports SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) as defined in the RapidS interface specification. It does not support Mode 1 or Mode 2. Clock polarity and phase must match these two modes for reliable command execution and data transfer - verified in Section 4.1 and Table 13-1 of the datasheet.
How does the RDY/BUSY pin behave during a buffer-to-main-memory page program?
During a buffer-to-main-memory page program (opcodes 83H/86H), the RDY/BUSY pin is actively driven low for the entire self-timed duration (tEP, max 20ms), indicating the device is busy erasing and programming. It remains low even if CS is deasserted mid-operation, returning high only after completion - ensuring host systems can reliably poll status without polling registers.
Can AT45DB321D-MU-SL383 be used without connecting the RESET pin?
Yes, AT45DB321D-MU-SL383 incorporates an internal power-on reset circuit, so the RESET pin may be left unconnected or externally tied to VCC if system-level reset control is unnecessary. The datasheet recommends external pull-up to VCC when unused, and confirms normal operation resumes immediately after power stabilization without external reset assertion.
Is the exposed metal pad on the VDFN package of AT45DB321D-MU-SL383 electrically connected?
No, the exposed metal pad on the bottom of the AT45DB321D-MU-SL383 VDFN (MLF) package is electrically floating per Figure 1-1 and Note 1 in the datasheet. It may be left as "No Connect" or optionally connected to GND for thermal enhancement - but no internal connection exists, and grounding it does not affect electrical performance or ESD rating.
AT45DB321D-MU-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:
- 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-SL383 FAQ
1.How can I place an order for AT45DB321D-MU-SL383 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321D-MU-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-SL383 reliable?
The price and inventory of AT45DB321D-MU-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-SL383 is usually 5 days.
3.What payment methods are accepted for AT45DB321D-MU-SL383?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321D-MU-SL383 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321D-MU-SL383?
AT45DB321D-MU-SL383 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321D-MU-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-SL383?
For technical support, including AT45DB321D-MU-SL383 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321D-MU-SL383 requirements.
6.How does Aetrix verify that AT45DB321D-MU-SL383 is sourced from the original manufacturer or authorized distributors?
All AT45DB321D-MU-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-SL383 meets industry standards.
7.What is the process for return or replacement of AT45DB321D-MU-SL383?
All AT45DB321D-MU-SL383 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321D-MU-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-SL383 part is unused and in its original packaging.
Return procedure for AT45DB321D-MU-SL383:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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