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Renesas AT45DB321D-SU-2.5-SL383
- Part No.:
- AT45DB321D-SU-2.5-SL383
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DB321D-SU-2.5-SL383.pdf
- Description:
- IC FLASH 32MBIT SPI 50MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,201
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Product details
Overview
AT45DB321D-SU-2.5-SL383 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 operates from a single 2.5V–3.6V supply and delivers up to 66MHz read throughput for code shadowing and firmware storage in embedded controllers.
For engineers reviewing the AT45DB321D-SU-2.5-SL383 datasheet, AT45DB321D-SU-2.5-SL383 pinout, AT45DB321D-SU-2.5-SL383 application, or AT45DB321D-SU-2.5-SL383 equivalent, key selection criteria include page-program timing, buffer-to-flash transfer capability, sector lockdown security, RDY/BUSY signaling, and 100,000-cycle endurance at 20-year data retention.
Technical Context
The AT45DB321D-SU-2.5-SL383 implements a sequential-access flash architecture with two independent SRAM buffers enabling concurrent receive-and-reprogram operation. Its RapidS interface supports SPI modes 0 and 3 at up to 66MHz, using standard SI/SO/SCK/CS signals plus dedicated RDY/BUSY, WP, and RESET pins.
Memory organization comprises 8,192 pages (512 or 528 bytes each), grouped into 64 sectors with hierarchical erase granularity: page (512B), block (4KB), sector (64KB), and full chip (32Mb). Page programming includes built-in erase or no-erase variants, both self-timed and indicated via RDY/BUSY pin or status register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 32Mb (34,603,008 bits), organized as 8,192 × 512/528-byte pages |
| Supply Voltage | 2.5V–3.6V single supply - enables direct interfacing with 2.5V/3.3V logic without level shifters |
| Interface Speed | Up to 66MHz SCK - supports high-throughput continuous array reads (0BH/E8H opcodes) |
| Page Program Endurance | ≥100,000 cycles per page - ensures long-term field reliability for firmware update partitions |
| Data Retention | 20 years at 85°C - validated for industrial lifecycle requirements without refresh |
| Power Consumption | 7mA active read current, 25µA standby, 15µA deep power-down - suitable for battery-backed systems |
| Security Features | 128-byte security register (64-byte user programmable + 64-byte unique ID) and sector lockdown - enables secure boot image protection |
Pinout & Package
AT45DB321D-SU-2.5-SL383 is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with 150-mil body width, RoHS-compliant lead finish, and industrial-grade thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates command sequence on falling edge and terminates on rising edge |
| SCK | Serial Clock | Input clock for synchronous data transfer; latches SI on rising edge, clocks SO on falling edge |
| SI | Serial Input | Command, address, and data input line; MSB-first protocol with no internal pull-up |
| SO | Serial Output | Command response and data output line; open-drain capable, requires external pull-up |
| WP | Write Protect | Hardware lock for sector protection; overrides software commands when asserted low |
| RESET | Reset Input | Active-low asynchronous reset; terminates ongoing operations and returns state machine to idle |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output; driven low during self-timed program/erase/page-transfer operations |
| VCC / GND | Power Supply | Single 2.5V–3.6V supply and ground reference; decoupling capacitor required per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers (512/528 bytes each) | Enables simultaneous data reception into one buffer while reprogramming flash from the other - eliminates write latency in streaming applications |
| Configurable Page Size (512 or 528 bytes) | Factory-set option allows alignment with legacy EEPROM emulation or optimized binary firmware partitioning |
| Flexible Erase Granularity | Supports page (512B), block (4KB), sector (64KB), and chip-wide erase - minimizes wear and optimizes OTA update efficiency |
| Continuous Array Read (E8H/0BH/03H) | Auto-incrementing internal address counter enables seamless page-boundary crossing and wraparound - ideal for XIP-capable microcontrollers |
| Sector Lockdown & Security Register | Prevents unauthorized modification of protected sectors and stores immutable device identity - meets basic secure boot requirements |
Applications
| Firmware Storage | Secure Boot Image Storage |
|---|---|
Use Scenario: Storing bootloader and application firmware for ARM Cortex-M or RISC-V microcontrollers requiring field-upgradable code. IC Role / Device Role / Timing Role: Nonvolatile storage device providing sequential read access to executable code images with minimal pin count and power overhead. Use Value: Continuous array read mode (0BH) enables zero-wait-state execution from flash via code shadowing, reducing MCU RAM usage by >64KB. |
Use Scenario: Hosting signed, encrypted boot images in safety-critical industrial gateways where tampering must be physically detectable. IC Role / Device Role / Timing Role: Secure nonvolatile storage with hardware-enforced sector lockdown and unique device identifier for cryptographic binding. Use Value: 128-byte security register allows storage of public keys and signatures; WP pin + lockdown prevents runtime overwrite of verified boot partition. |
| Audio/Log Data Buffering | Industrial HMI Configuration Storage |
Use Scenario: Capturing sensor telemetry or voice snippets in battery-powered edge nodes with intermittent connectivity. IC Role / Device Role / Timing Role: High-endurance sequential storage with dual-buffer pipelining to absorb bursty data streams without host CPU intervention. Use Value: Page program endurance (100K cycles) and 15µA deep power-down current extend battery life beyond 5 years in low-duty-cycle deployments. |
Use Scenario: Persisting display layouts, calibration tables, and user preferences in factory HMIs exposed to wide temperature swings. IC Role / Device Role / Timing Role: Industrial-grade serial flash providing deterministic write timing and 20-year data retention across –40°C to +85°C. Use Value: Sector erase capability isolates configuration updates from firmware partitions, preventing corruption during partial rewrites. |
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, 133MHz DTR mode; no SRAM buffers or page-size configurability | Better random read speed but lacks concurrent buffer operation; requires different driver stack | Preferred for high-speed instruction fetch; unsuitable for streaming write + read overlap |
| Macronix MX25L3233FZNI-10G | 32Mb standard SPI NOR flash; 104MHz max clock; no dual buffers or sector lockdown; 1.65–3.6V supply | Lower cost, wider voltage range, but no hardware write protect pin or security register | Acceptable for basic firmware storage where security and streaming are not required |
Compared with W25Q32JVSSIQ and MX25L3233FZNI-10G, the AT45DB321D-SU-2.5-SL383 uniquely combines dual SRAM buffering, hardware WP, sector lockdown, and factory-configurable page size - making it optimal for deterministic streaming, secure boot, and EEPROM-emulation use cases where those features are mandatory.
Availability
AT45DB321D-SU-2.5-SL383 is available at Aetrix Electronics and suitable for firmware storage, secure boot image hosting, audio/data logging, and industrial HMI configuration management requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for AT45DB321D-SU-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-SU-2.5-SL383 under its DataFlash portfolio.
The AT45DB321D-SU-2.5-SL383 belongs to the Atmel DataFlash family - designed specifically for high-reliability, low-pin-count, sequential-access flash applications in resource-constrained embedded systems requiring concurrent read/write capability and hardware security primitives.
FAQ
What is the operating voltage range for the AT45DB321D-SU-2.5-SL383?
The AT45DB321D-SU-2.5-SL383 operates from a single 2.5V to 3.6V supply. This range supports direct connection to 2.5V and 3.3V logic families without level translation. The "2.5" suffix in the part number explicitly denotes guaranteed functionality down to 2.5V, unlike variants rated only for 2.7V–3.6V operation. All specifications-including 66MHz interface speed and 100,000 program/erase cycles-are validated across this full voltage window.
Does the AT45DB321D-SU-2.5-SL383 support true EEPROM emulation?
Yes, the AT45DB321D-SU-2.5-SL383 supports robust EEPROM emulation via its three-step read-modify-write operation, enabled by dual SRAM buffers and page-level programming. Unlike standard NOR flash, it allows byte- or bit-level updates without requiring full-sector erases-making it suitable for parameter storage, counters, and configuration registers. The AT45DB321D-SU-2.5-SL383 achieves this through internal buffer management and automatic erase-before-program sequencing, eliminating host-side wear-leveling complexity.
How does the RDY/BUSY pin function during AT45DB321D-SU-2.5-SL383 operations?
The RDY/BUSY pin on the AT45DB321D-SU-2.5-SL383 is an open-drain output that goes low during all self-timed operations: page programming (with or without built-in erase), page/block/sector/chip erase, buffer-to-buffer transfers, and page-to-buffer copies. It remains high during idle, command decoding, and continuous reads. Because the AT45DB321D-SU-2.5-SL383 does not require polling status registers for most operations, this pin provides deterministic hardware flow control-critical for real-time systems where interrupt latency must be bounded.
Can the AT45DB321D-SU-2.5-SL383 page size be changed after manufacturing?
No, the page size (512 bytes vs. 528 bytes) of the AT45DB321D-SU-2.5-SL383 is factory-configured and fixed for the lifetime of the device. The "528-byte" mode includes 16 bytes of overhead per page for ECC and metadata, while "512-byte" mode aligns with power-of-two addressing for simpler EEPROM emulation. Host firmware must be compiled for the correct page size-verified via JEDEC ID read-and mismatched configurations will cause address misalignment and data corruption. The AT45DB321D-SU-2.5-SL383 does not support runtime switching.
What package type is used for the AT45DB321D-SU-2.5-SL383?
The AT45DB321D-SU-2.5-SL383 uses an 8-pin SOIC (Small Outline Integrated Circuit) package with 150-mil body width and gull-wing leads. This is confirmed by the "-SU" suffix in the part number per Microchip's naming convention. The package is Pb/halide-free, RoHS-compliant, and rated for industrial temperature operation (–40°C to +85°C). Pinout matches standard SOIC-8 footprint, with no NC pins-enabling drop-in replacement in existing designs using compatible DataFlash devices.
AT45DB321D-SU-2.5-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:
- 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-SOIC
AT45DB321D-SU-2.5-SL383 FAQ
1.How can I place an order for AT45DB321D-SU-2.5-SL383 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321D-SU-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-SU-2.5-SL383 reliable?
The price and inventory of AT45DB321D-SU-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-SU-2.5-SL383 is usually 5 days.
3.What payment methods are accepted for AT45DB321D-SU-2.5-SL383?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321D-SU-2.5-SL383 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321D-SU-2.5-SL383?
AT45DB321D-SU-2.5-SL383 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321D-SU-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-SU-2.5-SL383?
For technical support, including AT45DB321D-SU-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-SU-2.5-SL383 requirements.
6.How does Aetrix verify that AT45DB321D-SU-2.5-SL383 is sourced from the original manufacturer or authorized distributors?
All AT45DB321D-SU-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-SU-2.5-SL383 meets industry standards.
7.What is the process for return or replacement of AT45DB321D-SU-2.5-SL383?
All AT45DB321D-SU-2.5-SL383 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321D-SU-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-SU-2.5-SL383 part is unused and in its original packaging.
Return procedure for AT45DB321D-SU-2.5-SL383:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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