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Renesas AT45DB321D-SU-2.5
- Part No.:
- AT45DB321D-SU-2.5
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT45DB321D-SU-2.5.pdf
- Description:
- IC FLASH 32MBIT SPI 50MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,178
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Product details
Overview
AT45DB321D-SU-2.5 from Microchip Technology (formerly Atmel) is a 32Mb serial DataFlash memory IC with SPI-compatible RapidS interface, supporting up to 66MHz clock frequency, 512/528-byte configurable page size, and dual 512/528-byte SRAM buffers for concurrent read/write operations - used in embedded code shadowing, firmware storage, and voice/image buffering applications.
For engineers reviewing the AT45DB321D-SU-2.5 datasheet, AT45DB321D-SU-2.5 pinout, AT45DB321D-SU-2.5 application, or AT45DB321D-SU-2.5 equivalent, key selection criteria include single 2.5V supply operation, industrial temperature range (–40°C to +85°C), JEDEC-compliant ID read capability, sector lockdown security, and flexible erase granularity (page/block/sector/chip).
Technical Context
The AT45DB321D-SU-2.5 implements a sequential-access flash architecture with two independent SRAM buffers enabling simultaneous data reception and flash reprogramming. Its RapidS interface supports SPI modes 0 and 3, with command-driven operations including continuous array read (03H/0BH/E8H), buffer-to-page program (83H/86H), and page/block/sector/chip erase.
Memory organization comprises 8,192 pages of 512 or 528 bytes each, arranged in 64 sectors (two 8-page subsectors + sixty-two 128-page sectors), with dedicated 128-byte security register (64-byte user programmable + 64-byte unique device ID). All program/erase cycles are internally self-timed and require no external high-voltage programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32Mb (34,603,008 bits), organized as 8,192 × 512/528-byte pages |
| Supply Voltage | 2.5V ±0.2V - enables direct integration with 2.5V logic systems without level shifting |
| Interface Speed | Up to 66MHz SCK - supports high-throughput firmware updates and real-time audio streaming |
| Erase Granularity | Page (512B), block (4KB), sector (64KB), chip (32Mb) - allows precise field firmware patching |
| Data Retention | 20 years - ensures long-term reliability in unattended industrial deployments |
| Endurance | 100,000 program/erase cycles per page - supports frequent OTA update cycles in connected devices |
| Power Consumption | 7mA active read current, 25µA standby, 15µA deep power-down - extends battery life in portable systems |
Pinout & Package
AT45DB321D-SU-2.5 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 (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; falling edge initiates command sequence, rising edge terminates operation and enters standby |
| SCK | Serial Clock | Master-generated clock; data latched on rising edge (SI), output shifted on falling edge (SO) |
| SI | Serial Input | Command, address, and data input path; MSB-first protocol compliant with SPI mode 0/3 |
| SO | Serial Output | Read data and status output; tri-stated when CS is high |
| WP | Write Protect | Hardware-level sector protection override; low state blocks all program/erase commands to protected sectors |
| RESET | Reset | Active-low asynchronous abort; forces idle state and clears internal command pipeline |
| 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 supply with decoupling required; GND serves as reference for all I/O and internal logic |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM buffers (512/528 bytes each) | Enables pipelined operation: receive new data into one buffer while programming flash from the other |
| Continuous array read (E8H/0BH/03H) | Eliminates address retransmission across page boundaries - critical for seamless code shadowing and audio playback |
| Configurable page size (512 vs 528 bytes) | Factory-set option supports legacy binary alignment or DataFlash-optimized 528-byte ECC-ready layout |
| 128-byte security register | Provides tamper-resistant storage for keys, calibration data, and unique device identifiers |
| Sector lockdown capability | Per-sector hardware write lock prevents accidental or malicious overwrite of boot code or secure firmware partitions |
| JEDEC manufacturer/device ID read | Enables automated BOM verification and supply-chain traceability during system bring-up and production test |
Applications
| Firmware Storage | Code Shadowing |
|---|---|
Use Scenario: Storing and updating bootloader and application firmware in microcontroller-based edge nodes. IC Role / Device Role / Timing Role: Nonvolatile program memory accessed via SPI during cold boot and OTA updates. Use Value: 100,000 endurance cycles and 20-year retention ensure reliable field upgrades over product lifetime. |
Use Scenario: Loading executable code from flash into RAM for execution in resource-constrained MCUs. IC Role / Device Role / Timing Role: High-speed sequential read source feeding instruction cache or XIP-capable memory controller. Use Value: Continuous array read at 66MHz eliminates wait states and enables deterministic execution timing. |
| Voice/Data Logging | Secure Configuration Storage |
Use Scenario: Recording sensor telemetry or voice snippets in battery-powered IoT endpoints. IC Role / Device Role / Timing Role: Low-power persistent buffer with page-erase flexibility for circular logging. Use Value: 15µA deep power-down current and page-level erase minimize energy per write cycle. |
Use Scenario: Storing cryptographic keys, calibration coefficients, and device-specific credentials. IC Role / Device Role / Timing Role: Secure nonvolatile register with hardware lockdown and unique ID binding. Use Value: Sector lockdown + 64-byte unique ID prevent cloning and enforce secure provisioning workflows. |
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 continuous read wraparound | Lacks pipelined buffer operation and seamless page-crossing read - less optimal for real-time streaming | Preferred where quad I/O bandwidth > sequential throughput, and firmware is partitioned for erase-block alignment |
| Macronix MX25L3233FZNI-10G | 32Mb standard SPI NOR flash; 104MHz max clock; no dual-buffer architecture or sector lockdown | No hardware write protection granularity below block level; no built-in security register | Selected when cost sensitivity outweighs need for secure configuration storage or concurrent I/O |
Compared with AT45DB321D-SU-2.5, W25Q32JVSSIQ delivers higher peak bandwidth but requires software-managed buffering and lacks page-wrap continuous read, while MX25L3233FZNI-10G offers lower unit cost but omits hardware security features and concurrent buffer operation essential for deterministic embedded streaming.
Availability
AT45DB321D-SU-2.5 is available at Aetrix Electronics and suitable for firmware storage, code shadowing, voice/data logging, and secure configuration storage requiring stable component supply, long-term lifecycle support, and industrial temperature compliance.
Supply support for AT45DB321D-SU-2.5 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 technical and manufacturing continuity for the DataFlash product line, delivering high-reliability serial flash solutions for industrial and automotive markets.
The AT45DB321D-SU-2.5 belongs to the Atmel DataFlash family, engineered specifically for sequential-access applications demanding low pin count, integrated buffering, and hardware-assisted security - not general-purpose random-access NOR/NAND replacement.
FAQ
What voltage range does the AT45DB321D-SU-2.5 support, and is it compatible with 3.3V systems?
The AT45DB321D-SU-2.5 is specified for 2.5V ±0.2V operation only (2.3V to 2.7V), as confirmed by its "-2.5" suffix and datasheet Section 1. It is not rated for 3.3V operation; applying 3.3V may cause functional failure or accelerated wear. For 3.3V systems, consider the AT45DB321D-SU variant (2.7V–3.6V), not the AT45DB321D-SU-2.5. Always verify VCC tolerance before board integration.
Does the AT45DB321D-SU-2.5 support true byte-level writes like EEPROM?
No, the AT45DB321D-SU-2.5 does not support true byte-level writes. It is a page-erasable flash device requiring full-page (512/528-byte) erasure before reprogramming. However, EEPROM emulation is achievable via host-side software using the device's dual buffers and three-step read-modify-write sequence - this is explicitly documented in the datasheet Section 1, not inherent hardware functionality.
How does the RDY/BUSY pin behave during a buffer-to-page program operation on the AT45DB321D-SU-2.5?
During a buffer-to-page program (e.g., opcode 83H or 86H), the RDY/BUSY pin is driven low immediately after CS rises and remains low for the entire self-timed duration (tEP, max 25ms). It returns high only upon completion, signaling readiness for the next command. This behavior is identical for both built-in-erase and no-erase variants, and applies regardless of page size configuration.
Can the AT45DB321D-SU-2.5 be used in place of standard SPI NOR flash in existing designs?
The AT45DB321D-SU-2.5 is not a drop-in replacement for standard SPI NOR flash due to fundamental architectural differences: it uses sequential access (no random-addressing opcodes), requires page-aligned writes, and lacks common NOR commands (e.g., 03H fast read with dummy cycles). Hardware and firmware must be adapted to its RapidS protocol, buffer management, and continuous-read semantics.
What is the purpose of the "SU" in AT45DB321D-SU-2.5, and does it indicate package type?
The "SU" suffix denotes the 8-pin SOIC (Small Outline IC) package with 150-mil body width and surface-mount gull-wing leads, per Microchip's official part numbering convention. It is distinct from "SF" (8-pin TSSOP), "MH" (MLF/VDFN), and "BG" (BGA) variants. The "-2.5" suffix explicitly confirms 2.5V-only operation, separate from the "-2.7" (2.7V–3.6V) version.
AT45DB321D-SU-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- 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 FAQ
1.How can I place an order for AT45DB321D-SU-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321D-SU-2.5 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 reliable?
The price and inventory of AT45DB321D-SU-2.5 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 is usually 5 days.
3.What payment methods are accepted for AT45DB321D-SU-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321D-SU-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321D-SU-2.5?
AT45DB321D-SU-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321D-SU-2.5 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?
For technical support, including AT45DB321D-SU-2.5 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 requirements.
6.How does Aetrix verify that AT45DB321D-SU-2.5 is sourced from the original manufacturer or authorized distributors?
All AT45DB321D-SU-2.5 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 meets industry standards.
7.What is the process for return or replacement of AT45DB321D-SU-2.5?
All AT45DB321D-SU-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321D-SU-2.5, 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 part is unused and in its original packaging.
Return procedure for AT45DB321D-SU-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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