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Microchip Technology AT45DB321D-SU-2.5
- Part No.:
- AT45DB321D-SU-2.5
- Manufacturer:
- Microchip Technology
- 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:3,957
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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, operating from a single 2.5V supply. It delivers 66MHz max clock frequency, 8,192 pages of 512/528-byte configurable storage, dual 512/528-byte SRAM buffers, and supports page/block/sector/chip erase for embedded code and data logging 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 its 2.5V operation, dual-buffered sequential read/write capability, hardware write protection (WP), RDY/BUSY signaling, and industrial temperature support - all critical for reliable firmware storage in resource-constrained systems.
Technical Context
The AT45DB321D-SU-2.5 implements a sequential-access flash architecture with two independent 512/528-byte SRAM buffers enabling concurrent data reception and flash reprogramming. Its RapidS interface supports SPI modes 0 and 3 at up to 66MHz, with continuous array read bypassing buffers to enable code shadowing without address overhead.
Memory organization comprises 8,192 pages (512 or 528 bytes each), grouped into 64 sectors (each containing 128 pages except Sector 0a), with flexible erase granularity: page (512B), block (4KB), sector (64KB), or full chip (32Mb). All program/erase operations are self-timed and require no external high-voltage supply.
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 domains without level shifting |
| Interface speed | Up to 66MHz SCK - supports high-throughput firmware updates and audio streaming |
| Active read current | 7mA typical - minimizes power draw during boot-time code fetch or log retrieval |
| Data retention | 20 years - ensures long-term reliability for industrial firmware and calibration data storage |
| Endurance | 100,000 program/erase cycles per page - suitable for frequent field-upgrade scenarios |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded control and telemetry 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 and halide-free.
| 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 | Controls data timing; commands and input data latched on rising edge, output data valid on falling edge |
| SI | Serial Input | Unidirectional command/address/data input path; MSB-first protocol |
| SO | Serial Output | Unidirectional data output path; supports continuous read without readdressing |
| WP | Write Protect | Hardware-level sector lockout; overrides software protection when asserted low |
| RESET | Reset | Aborts ongoing operation and returns state machine to idle; internally pulled high |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output; driven low during self-timed program/erase/page-to-buffer transfers |
| VCC / GND | Power Supply | Single 2.5V supply with dedicated ground; no auxiliary voltage rails required |
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 |
| Configurable page size (512 or 528 bytes) | Factory-set option allows alignment with legacy EEPROM emulation or optimized binary storage layouts |
| Continuous array read (E8H/0BH/03H) | Eliminates per-page addressing overhead - ideal for boot ROM shadowing and linear media playback |
| 128-byte security register | Provides 64-byte user-programmable space plus unique 64-byte device ID for secure firmware binding |
| Hardware + software protection | Combines WP pin lockdown with sector-specific software registers to prevent accidental or malicious overwrites |
Applications
| Firmware Storage | Data Logging |
|---|---|
|
Use Scenario: Storing bootloader and application firmware in microcontroller-based edge nodes with limited PCB area. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast sequential read and in-system reprogrammability via SPI. Use Value: 66MHz RapidS interface reduces boot time vs. standard SPI flash; dual buffers allow background firmware update without halting system operation. |
Use Scenario: Capturing sensor readings in industrial monitoring equipment with intermittent connectivity. IC Role / Device Role / Timing Role: High-endurance, low-power sequential data sink supporting timestamped records and wraparound buffering. Use Value: 100,000 page endurance and 25µA standby current extend battery life; sector erase enables selective log cleanup without full chip wipe. |
| Audio Playback | Secure Configuration Storage |
|
Use Scenario: Embedded voice prompts and alarm tones in medical devices requiring deterministic latency. IC Role / Device Role / Timing Role: Continuous-read audio buffer delivering uninterrupted PCM stream to DAC. Use Value: Zero-gap page boundary crossing and 66MHz read speed ensure glitch-free playback; no external RAM needed for streaming. |
Use Scenario: Storing calibrated parameters and cryptographic keys in test equipment with anti-tampering requirements. IC Role / Device Role / Timing Role: Tamper-resistant configuration vault using sector lockdown and unique device ID binding. Use Value: Hardware WP pin + 128-byte security register prevents unauthorized parameter modification; device ID enables 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; 1.8V–3.6V supply; no dual buffers; 133MHz QSPI vs. 66MHz SPI | Lacks continuous read optimization and buffer pipelining; better suited for XIP than streaming | Select for higher-density XIP execution where parallelism outweighs sequential throughput needs |
| Macronix MX25L3233FZNI-10G | 32Mb standard SPI flash; 2.7V–3.6V supply; 104MHz max clock; no SRAM buffers or configurable page size | No built-in EEPROM emulation support; requires external logic for byte-alterable storage | Choose when cost sensitivity outweighs need for rapid page reprogramming and hardware write protection |
Compared with W25Q32JVSSIQ and MX25L3233FZNI-10G, the AT45DB321D-SU-2.5 uniquely combines 2.5V operation, dual SRAM buffers, and factory-configurable 512-byte pages - making it optimal for deterministic streaming, firmware patching, and secure parameter storage where power, pin count, and sequential access efficiency are prioritized over raw bandwidth or quad interface features.
Availability
AT45DB321D-SU-2.5 is available at Aetrix Electronics and suitable for firmware storage, data logging, audio playback, and secure configuration storage requiring stable component supply across industrial design cycles.
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 the DataFlash product line, specializing in high-reliability serial memory solutions for industrial and automotive markets.
The AT45DB321D belongs to the DataFlash family, engineered for sequential-access applications where low pin count, deterministic read latency, and in-system reprogrammability outweigh random-access requirements.
FAQ
What is the operating voltage range for the AT45DB321D-SU-2.5?
The AT45DB321D-SU-2.5 operates from a single 2.5V ±0.2V supply, as confirmed by its "-SU-2.5" suffix and datasheet Section 1. This fixed 2.5V rating distinguishes it from the broader AT45DB321D family, which also supports 2.7V–3.6V operation. The device draws 7mA typical active current and 25µA standby current at this voltage, enabling direct compatibility with 2.5V FPGA I/O banks and low-voltage microcontrollers without level shifters.
Does the AT45DB321D-SU-2.5 support true byte-level writes like EEPROM?
The AT45DB321D-SU-2.5 does not support true byte-level writes, but enables EEPROM emulation via a self-contained three-step read-modify-write operation using its dual SRAM buffers. This allows bit- or byte-alterable storage without external RAM, leveraging the 512/528-byte page structure and internal buffer-to-flash programming. Unlike EEPROM, however, each write still consumes a full page's endurance budget (100,000 cycles), and the process requires explicit host coordination - the AT45DB321D-SU-2.5 itself does not hide this complexity in hardware.
How does the RDY/BUSY pin function during programming on the AT45DB321D-SU-2.5?
The RDY/BUSY pin on the AT45DB321D-SU-2.5 is an open-drain output that is actively pulled low during all self-timed operations: page programming, block/sector/chip erase, and page-to-buffer transfers. It remains low until the operation completes, after which it returns high (via external pull-up). This signal allows the host controller to poll status without reading internal registers, reducing SPI traffic. During a busy state, the main memory array and the involved buffer are inaccessible, though the other SRAM buffer remains available for concurrent use - a key feature of the AT45DB321D-SU-2.5 architecture.
Can the AT45DB321D-SU-2.5 be used as a drop-in replacement for other DataFlash parts?
The AT45DB321D-SU-2.5 shares pinout and command compatibility with other AT45DB321D variants (e.g., -SU, -MUN, -TU), but is not a drop-in replacement for earlier generations like AT45DB161D due to differences in page size configuration, security register layout, and timing parameters. Its 8-pin SOIC package matches the -SU variant footprint, and the -2.5 suffix confirms 2.5V-only operation - substituting it for a 2.7V–3.6V part without verifying VCC tolerance may cause functional failure. Always validate timing margins and reset behavior before interchanging AT45DB321D-SU-2.5 with other DataFlash devices.
What packaging options are available for the AT45DB321D-SU-2.5?
The AT45DB321D-SU-2.5 is supplied exclusively in an 8-pin SOIC package (150-mil width) with green, Pb/halide-free, RoHS-compliant construction. Unlike some AT45DB321D variants offered in MLF (VDFN), BGA, or TSOP packages, the "-SU-2.5" suffix specifically denotes the SOIC variant. The datasheet explicitly states that TSOP is not recommended for new designs, and MLF/BGA variants carry different suffixes (e.g., -MUN, -TU). No wafer-level chip-scale or DFN options exist for the AT45DB321D-SU-2.5.
AT45DB321D-SU-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- 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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