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Renesas AT45DB321D-TU-SL383
- Part No.:
- AT45DB321D-TU-SL383
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 28-TSSOP (0.465", 11.80mm Width)
- Datasheet:
-
AT45DB321D-TU-SL383.pdf
- Description:
- IC FLASH 32MBIT SPI 66MHZ 28TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,358
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Product details
Overview
AT45DB321D-TU-SL383 from Microchip Technology (acquired Atmel) is a 32Mb serial DataFlash memory IC with SPI-compatible RapidS interface, 66MHz max clock, dual 512/528-byte SRAM buffers, and flexible page/block/sector/chip erase architecture. It operates from a single 2.5V–3.6V supply and supports code shadowing in embedded microcontroller boot systems.
For engineers reviewing the AT45DB321D-TU-SL383 datasheet, AT45DB321D-TU-SL383 pinout, AT45DB321D-TU-SL383 application, or AT45DB321D-TU-SL383 equivalent, key selection criteria include buffer-assisted continuous read capability, hardware write protection via WP pin, sector lockdown security, JEDEC ID support, and industrial temperature operation.
Technical Context
The AT45DB321D-TU-SL383 implements a sequential-access flash architecture with two independent 512/528-byte SRAM buffers enabling simultaneous data reception and flash reprogramming. Its RapidS interface supports SPI modes 0 and 3 at up to 66MHz for high-speed continuous array reads (E8H/0BH opcodes) and buffered transfers.
Memory organization comprises 8,192 pages of 512 or 528 bytes each, grouped into sectors (e.g., Sector 0a = 8 pages, Sector 0b = 120 pages), blocks (8 pages), and 64 total sectors. Erase granularity includes page (512B), block (4KB), sector (64KB), and full chip (32Mb), all self-timed with RDY/BUSY pin indication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 32Mb (34,603,008 bits) organized as 8,192 × 512/528-byte pages |
| Interface Speed | Up to 66MHz SCK for continuous read (0BH/E8H); supports SPI modes 0 and 3 |
| Supply Voltage | Single 2.5V–3.6V or 2.7V–3.6V rail - eliminates need for charge pumps or dual supplies |
| Power Consumption | 7mA typical active read current; 25µA standby; 15µA deep power-down |
| Erase Endurance | 100,000 program/erase cycles per page minimum - suitable for firmware update logging |
| Data Retention | 20 years at industrial temperature range (−40°C to +85°C) |
| Security Features | 128-byte security register (64-byte user programmable + 64-byte unique device ID) |
Pinout & Package
AT45DB321D-TU-SL383 is supplied in an 8-pin SOIC package (3.9mm × 4.9mm, 1.27mm pitch), RoHS-compliant and halide-free.
| 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 for all operations |
| SO | Serial Output | Command response, status, and memory/buffer data output path |
| WP | Write Protect | Hardware lock: low state disables program/erase on protected sectors regardless of software settings |
| 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 (program/erase/buffer transfer) |
| VCC / GND | Power Supply | Single 2.5V–3.6V supply with dedicated ground - no voltage translation required |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM buffers (512/528 bytes each) | Enables concurrent data streaming into one buffer while reprogramming flash from the other - critical for real-time firmware updates |
| Continuous array read (E8H/0BH/03H) | Eliminates address retransmission between pages; wraps seamlessly across boundaries - ideal for XIP code shadowing |
| Flexible page size (factory-configurable 512 or 528 bytes) | 528-byte mode supports ECC overhead storage; 512-byte mode aligns with binary addressing for simpler host drivers |
| Sector lockdown & 128-byte security register | Allows permanent locking of boot code sectors and secure storage of keys/device identity - meets basic secure boot requirements |
| Hardware write protection (WP pin) | Provides fail-safe, non-volatile protection independent of software state - prevents accidental corruption during power transitions |
Applications
| Boot Code Storage | Firmware Update Logging |
|---|---|
Use Scenario: Storing boot loader and initial firmware image for microcontrollers requiring fast, reliable startup from external memory. IC Role / Device Role / Timing Role: Sequential-access flash memory providing XIP-capable continuous read for direct execution from buffer-cached pages. Use Value: Eliminates need for parallel NOR flash; reduces PCB footprint and signal count while maintaining 66MHz read throughput for deterministic boot timing. | Use Scenario: Capturing incremental firmware patches and version metadata in industrial gateways performing over-the-air (OTA) updates. IC Role / Device Role / Timing Role: Non-volatile log storage with atomic page-level writes and sector lockdown to preserve integrity during power loss. Use Value: Dual-buffer operation allows new firmware to be staged in SRAM while legacy code continues executing - enabling zero-downtime updates. |
| Audio Sample Buffering | Secure Configuration Storage |
Use Scenario: Storing compressed voice prompts or audio samples in VoIP phones and smart speakers where burst-read latency must be minimized. IC Role / Device Role / Timing Role: High-speed sequential memory accessed via RapidS interface to feed DACs without CPU intervention. Use Value: Continuous read mode (0BH) delivers sustained 66MHz throughput with no inter-page delays - ensures glitch-free audio playback. | Use Scenario: Storing calibrated sensor offsets, cryptographic keys, and device-specific configuration in medical diagnostics equipment. IC Role / Device Role / Timing Role: Secure non-volatile storage with hardware-locked sectors and unique 64-byte device ID for anti-cloning. Use Value: Sector lockdown prevents unauthorized overwrite; 128-byte security register enables tamper-resistant key binding to physical hardware. |
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; 133MHz QPI mode | Lacks dual-buffer streaming and continuous read wraparound; requires different driver stack | Choose for higher random read speed and QSPI compatibility; avoid if buffer-assisted streaming or seamless page-wrap is required. |
| Macronix MX25L3233FZBI-12G | 32Mb standard SPI NOR flash; no SRAM buffers; 104MHz max clock; no sector lockdown | No hardware write protect pin or security register; limited erase flexibility (no page erase) | Choose for cost-sensitive designs needing basic SPI flash; avoid when secure boot, OTA staging, or low-power deep sleep are mandatory. |
Compared with AT45DB321D-TU-SL383, W25Q32JVSSIQ offers faster random access but lacks the dual-buffer streaming and continuous read wrap essential for real-time firmware staging, while MX25L3233FZBI-12G omits hardware write protection and sector lockdown - making AT45DB321D-TU-SL383 uniquely suited for secure, buffer-optimized embedded storage.
Availability
AT45DB321D-TU-SL383 is available at Aetrix Electronics and suitable for boot code storage, firmware update logging, and secure configuration storage requiring stable component supply across industrial, medical, and communications product lifecycles.
Supply support for AT45DB321D-TU-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 line, including documentation, validation, and long-term supply assurance.
The AT45DB321D-TU-SL383 belongs to the Atmel DataFlash family, designed specifically for embedded systems requiring low-pin-count, low-power, sequential-access flash with integrated buffering and hardware security features.
FAQ
What is the factory-default page size for AT45DB321D-TU-SL383?
The AT45DB321D-TU-SL383 is factory preconfigured for 512-byte pages. This setting aligns with binary addressing (A21–A0) and simplifies host driver implementation. The 528-byte mode is available via factory option but is not the default for this specific part number variant.
Does AT45DB321D-TU-SL383 support true byte-level writes like EEPROM?
No, AT45DB321D-TU-SL383 does not support true byte-level writes. It requires page-level programming (512/528 bytes) after prior erasure. However, EEPROM emulation is achievable through a three-step read-modify-write sequence managed by host firmware - leveraging the dual SRAM buffers to minimize latency.
Can AT45DB321D-TU-SL383 operate at 2.5V and still achieve 66MHz interface speed?
Yes, AT45DB321D-TU-SL383 supports 66MHz RapidS operation across its full 2.5V–3.6V supply range. The fCAR1 specification (max continuous read speed) is guaranteed at 2.5V, confirmed in the official datasheet's AC characteristics table under VCC = 2.5V conditions.
How is the RDY/BUSY pin used during a buffer-to-main-memory program operation?
During a buffer-to-main-memory program (e.g., opcode 83H/86H), the RDY/BUSY pin is driven low immediately after CS deassertion and remains low for the entire self-timed duration (tEP, max 20ms). Host firmware must poll this pin or enable its interrupt to determine completion before issuing subsequent commands.
Is the 128-byte security register in AT45DB321D-TU-SL383 one-time programmable?
No, the 128-byte security register in AT45DB321D-TU-SL383 is reprogrammable. The first 64 bytes are user-programmable; the last 64 bytes contain a factory-programmed unique device identifier that cannot be altered. Sector lockdown commands are also reversible until permanently locked via the security register.
AT45DB321D-TU-SL383 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 28-TSSOP (0.465", 11.80mm 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:
- 28-TSOP
AT45DB321D-TU-SL383 FAQ
1.How can I place an order for AT45DB321D-TU-SL383 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321D-TU-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-TU-SL383 reliable?
The price and inventory of AT45DB321D-TU-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-TU-SL383 is usually 5 days.
3.What payment methods are accepted for AT45DB321D-TU-SL383?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321D-TU-SL383 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321D-TU-SL383?
AT45DB321D-TU-SL383 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321D-TU-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-TU-SL383?
For technical support, including AT45DB321D-TU-SL383 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321D-TU-SL383 requirements.
6.How does Aetrix verify that AT45DB321D-TU-SL383 is sourced from the original manufacturer or authorized distributors?
All AT45DB321D-TU-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-TU-SL383 meets industry standards.
7.What is the process for return or replacement of AT45DB321D-TU-SL383?
All AT45DB321D-TU-SL383 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321D-TU-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-TU-SL383 part is unused and in its original packaging.
Return procedure for AT45DB321D-TU-SL383:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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