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Renesas AT45DB321D-SU-SL383
- Part No.:
- AT45DB321D-SU-SL383
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DB321D-SU-SL383.pdf
- Description:
- IC FLASH 32MBIT SPI 66MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,145
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Product details
Overview
AT45DB321D-SU-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 continuous array reads ideal for code shadowing in embedded systems.
For engineers reviewing the AT45DB321D-SU-SL383 datasheet, AT45DB321D-SU-SL383 pinout, AT45DB321D-SU-SL383 application, or AT45DB321D-SU-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 functionality.
Technical Context
The AT45DB321D-SU-SL383 implements a sequential-access flash architecture with two independent 512/528-byte SRAM buffers, enabling simultaneous data reception into one buffer while reprogramming the main array from the other. Its RapidS serial interface supports SPI modes 0 and 3 at up to 66MHz, with hardware write protection (WP) and reset (RESET) control.
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 status indication via open-drain output.
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 frequency for RapidS/SPI mode 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 minimum |
| Data Retention | 20 years at industrial temperature range (−40°C to +85°C) |
Pinout & Package
AT45DB321D-SU-SL383 is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with standard pinout and 1.27mm pitch. The package is RoHS-compliant, halide-free, and green-marked.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; initiates command sequence on high-to-low transition and terminates operation on low-to-high transition |
| SCK | Serial Clock | Input clock controlling data latching (SI) on rising edge and data output (SO) on falling edge |
| SI | Serial Input | Command, address, and data input line; synchronous to SCK rising edge |
| SO | Serial Output | Data output line; synchronous to SCK falling edge; tri-stated when CS is high |
| WP | Write Protect | Hardware-level sector protection override; low-active; independent of software protection registers |
| RESET | Reset | Active-low hard reset; terminates ongoing operation and returns state machine to idle |
| RDY/BUSY | Ready/Busy Status | Open-drain output indicating internal self-timed activity (program/erase/buffer transfer); requires external pull-up |
| VCC / GND | Power Supply / Ground | Single 2.5V–3.6V supply rail and reference ground; no separate I/O voltage required |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM buffers | Two independent 512/528-byte buffers enable concurrent receive-and-program operation, eliminating dead time during page rewrites |
| Flexible erase granularity | Supports page (512B), block (4KB), sector (64KB), and chip (32Mb) erase - critical for firmware update partitioning and wear leveling |
| Continuous array read | Legacy (E8H), high-speed (0BH), and low-speed (03H) read modes allow seamless code shadowing without address reloads across page boundaries |
| Hardware + software security | Combines WP pin-based sector lockout with 128-byte security register (64B user-programmable + 64B unique device ID) |
| JEDIC ID compatibility | Standard manufacturer and device ID read commands simplify automated board programming and BOM verification |
Applications
| Boot Code Storage | Firmware Update Buffer |
|---|---|
Use Scenario: Storing boot loader and initial firmware image in embedded microcontrollers where fast, reliable nonvolatile storage is required prior to main application execution. IC Role / Device Role / Timing Role: Primary boot memory accessed sequentially via SPI during cold start; supports continuous read across page boundaries without latency penalty. Use Value: Eliminates need for parallel NOR flash or external RAM buffering; reduces PCB footprint and power during boot phase due to 7mA active read current. | Use Scenario: Holding validated firmware patches in-system before atomic swap into main application memory, minimizing downtime during over-the-air (OTA) updates. IC Role / Device Role / Timing Role: Dual-buffer architecture allows new firmware to be loaded into one SRAM buffer while the system continues executing from flash, then atomically programmed to main array. Use Value: Enables zero-downtime field updates by decoupling download (to buffer) and commit (buffer→flash) phases - critical for medical and industrial controllers. |
| Audio Sample Playback | Secure Configuration Storage |
Use Scenario: Streaming pre-recorded voice prompts or audio clips in consumer electronics (e.g., smart home devices, point-of-sale terminals). IC Role / Device Role / Timing Role: Continuous array read mode (0BH/E8H) delivers uninterrupted 66MHz serial data stream directly to DAC or audio processor without CPU intervention. Use Value: Achieves deterministic playback timing and eliminates jitter from address management overhead - unlike random-access flash requiring frequent command reissuance. | Use Scenario: Storing calibrated sensor offsets, cryptographic keys, and device-specific configuration parameters that must survive power loss and resist tampering. IC Role / Device Role / Timing Role: Sector lockdown + 128-byte security register provide hardware-enforced write protection and unique device identity binding. Use Value: Prevents unauthorized modification of calibration data or cloning via physical access - verified by JEDEC ID and secure register read-back. |
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 SRAM buffers; fixed 4KB sectors; no built-in page-size flexibility | Lacks concurrent buffer operation and continuous-read optimization; better suited for XIP code execution than streaming | Select if system requires Quad SPI bandwidth or execute-in-place (XIP) capability, not buffer-assisted streaming |
| Macronix MX25L3233FZNI-10G | 32Mb standard SPI NOR flash; 2.3–3.6V supply; no dual buffers; 4KB sector erase only; no sector lockdown or security register | No hardware write protection granularity or secure ID; simpler command set but no rapid streaming modes | Select for cost-sensitive designs needing basic firmware storage without security or concurrent I/O requirements |
Compared with W25Q32JVSSIQ and MX25L3233FZNI-10G, the AT45DB321D-SU-SL383 uniquely supports dual-buffer streaming, factory-configurable page size, and hardware-enforced sector lockdown - making it optimal for real-time audio, secure OTA updates, and deterministic boot code delivery where latency and data integrity are critical.
Availability
AT45DB321D-SU-SL383 is available at Aetrix Electronics and suitable for boot code storage, firmware update buffering, audio sample playback, and secure configuration storage requiring stable component supply, long-term lifecycle support, and industrial-grade reliability.
Supply support for AT45DB321D-SU-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 support for the legacy DataFlash product family, including manufacturing, documentation, and technical resources.
The AT45DB321D-SU-SL383 belongs to the Atmel DataFlash® series - designed specifically for high-reliability, low-pin-count serial flash applications demanding concurrent I/O, flexible erase, and embedded security in resource-constrained systems.
FAQ
What is the default page size configuration for AT45DB321D-SU-SL383?
The AT45DB321D-SU-SL383 is factory preconfigured for 512-byte pages. This binary-aligned size simplifies address arithmetic in microcontroller firmware and aligns with common memory-mapped peripheral boundaries. While 528-byte mode is supported, it requires explicit configuration via status register bit manipulation and is typically used only when legacy DataFlash compatibility is required. The 512-byte mode remains the default and most widely deployed configuration for AT45DB321D-SU-SL383.
Does AT45DB321D-SU-SL383 support Quad SPI or only standard SPI?
No, AT45DB321D-SU-SL383 supports only standard 3-wire SPI (SI/SO/SCK) with RapidS enhancements - not Quad SPI. It operates in SPI modes 0 and 3 at up to 66MHz using a single data-in and single data-out line. Unlike Quad SPI NOR flash devices, it does not use IO0–IO3 lines or dedicated quad opcodes. Its performance advantage comes from continuous-read optimization and dual-buffer concurrency, not parallel I/O lanes. This makes AT45DB321D-SU-SL383 pin-compatible with legacy SPI hosts but incompatible with Quad SPI controllers expecting four data lines.
How does the RDY/BUSY pin function during a buffer-to-main-memory program operation on AT45DB321D-SU-SL383?
During a buffer-to-main-memory program operation (e.g., opcode 83H or 86H), the RDY/BUSY pin on AT45DB321D-SU-SL383 is driven low immediately after the CS pin transitions high to initiate the self-timed operation. It remains low for the entire duration - including both erase and program phases - and returns high only upon completion. This open-drain signal requires an external pull-up resistor and provides hardware-ready feedback without polling the status register, enabling efficient interrupt-driven host firmware. The maximum program time (tEP) is 25ms for AT45DB321D-SU-SL383 under worst-case conditions.
Can AT45DB321D-SU-SL383 emulate EEPROM byte-write functionality?
Yes, AT45DB321D-SU-SL383 supports EEPROM emulation through a self-contained three-step read-modify-write sequence managed entirely within the device. The host reads a page into one SRAM buffer, modifies desired bytes, then writes the updated buffer back to flash. Because the device handles internal erase-before-write sequencing and status reporting, no external high-voltage circuitry or complex wear-leveling algorithms are needed. This capability is explicitly documented in the AT45DB321D datasheet and is a core design feature distinguishing DataFlash from conventional NOR/NAND flash - making AT45DB321D-SU-SL383 suitable for parameter storage requiring frequent small updates.
Is the SL383 suffix in AT45DB321D-SU-SL383 indicative of a specific temperature grade or packaging variant?
Yes, the SL383 suffix in AT45DB321D-SU-SL383 denotes the industrial temperature grade (−40°C to +85°C) and confirms the 8-pin SOIC package with standard lead finish (Pb-free, RoHS-compliant). The "SU" prefix indicates surface-mount SOIC, while "SL383" is Microchip's internal assembly code identifying the exact mold compound, die revision, and test flow for this industrial-grade variant. It is not a date code or lot identifier. All AT45DB321D-SU-SL383 units meet the full electrical and timing specifications across the industrial temperature range as defined in the 3597Q–DFLASH–6/11 datasheet.
AT45DB321D-SU-SL383 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- 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-SOIC
AT45DB321D-SU-SL383 FAQ
1.How can I place an order for AT45DB321D-SU-SL383 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321D-SU-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-SU-SL383 reliable?
The price and inventory of AT45DB321D-SU-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-SU-SL383 is usually 5 days.
3.What payment methods are accepted for AT45DB321D-SU-SL383?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321D-SU-SL383 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321D-SU-SL383?
AT45DB321D-SU-SL383 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321D-SU-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-SU-SL383?
For technical support, including AT45DB321D-SU-SL383 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321D-SU-SL383 requirements.
6.How does Aetrix verify that AT45DB321D-SU-SL383 is sourced from the original manufacturer or authorized distributors?
All AT45DB321D-SU-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-SU-SL383 meets industry standards.
7.What is the process for return or replacement of AT45DB321D-SU-SL383?
All AT45DB321D-SU-SL383 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321D-SU-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-SU-SL383 part is unused and in its original packaging.
Return procedure for AT45DB321D-SU-SL383:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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