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Renesas AT45DB321D-CCU
- Part No.:
- AT45DB321D-CCU
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 24-TBGA, CSPBGA
- Datasheet:
-
AT45DB321D-CCU.pdf
- Description:
- IC FLASH 32MBIT SPI 66MHZ 24CBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,677
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Product details
Overview
AT45DB321D-CCU from Microchip Technology (formerly Atmel) is a 32Mb serial DataFlash memory IC with SPI-compatible RapidS interface, organized as 8,192 pages of 512/528 bytes each, featuring 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 speed, and supports page/block/sector/chip erase for embedded code storage and data logging.
For engineers reviewing the AT45DB321D-CCU datasheet, AT45DB321D-CCU pinout, AT45DB321D-CCU application, or AT45DB321D-CCU equivalent, key selection criteria include buffer-assisted continuous read capability, hardware write protection (WP), RDY/BUSY status signaling, sector lockdown security, and JEDEC-compliant ID read - all critical for reliable firmware update and secure boot implementations.
Technical Context
The AT45DB321D-CCU implements a sequential-access flash architecture with two independent SRAM buffers enabling concurrent data reception and flash reprogramming. Its RapidS interface supports SPI modes 0 and 3 at up to 66MHz, with three distinct continuous read opcodes (03H, 0BH, E8H) optimized for low-, high-, and legacy-frequency operation.
Memory organization includes 64 sectors (two 8-page sub-sectors in Sector 0, sixty-three 128-page sectors), 1,024 blocks (8 pages each), and flexible erase granularity - page (512 B), block (4 KB), sector (64 KB), or full chip (32 Mb). All program/erase operations are internally self-timed and monitored via RDY/BUSY pin or status register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 32 Mbit (4 MB), organized as 8,192 × 512/528-byte pages |
| Interface | SPI-compatible RapidS serial interface, modes 0 and 3, up to 66 MHz clock |
| Supply voltage | 2.5V–3.6V single supply; no high-voltage programming required |
| Read current | 7 mA typical active read current enables low-power host MCU integration |
| Erase endurance | 100,000 program/erase cycles per page ensures long-term field reliability |
| Data retention | 20 years minimum at industrial temperature range (–40°C to +85°C) |
| Security features | 128-byte security register (64-byte user programmable + 64-byte unique ID) |
Pinout & Package
AT45DB321D-CCU is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with standard pin spacing and RoHS-compliant green finish. Pin functions are electrically defined and validated per Atmel/Microchip datasheet 3597Q–DFLASH–6/11.
| 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; commands/addresses latched on rising edge, SO data output on falling edge |
| SI | Serial Input | Unidirectional command, address, and data input path for all host-to-device transfers |
| SO | Serial Output | Unidirectional data output path; supports continuous read without address reload |
| WP | Write Protect | Hardware-level sector lock override; prevents accidental program/erase when asserted low |
| RESET | Reset | Active-low abort signal; forces internal state machine into idle state regardless of ongoing operation |
| RDY/BUSY | Ready/Busy Status | Open-drain output indicating internal self-timed operation progress (e.g., erase, program, transfer) |
| VCC / GND | Power Supply | Single 2.5V–3.6V supply with dedicated ground; decoupling recommended per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM buffers (512/528 B each) | Enables simultaneous data streaming into one buffer while reprogramming flash from the other - eliminates read/write dead time |
| Continuous array read (E8H/0BH/03H) | Supports seamless wrap-around reads across page and array boundaries at up to 66 MHz - ideal for code shadowing |
| Flexible page size configuration | Factory-configurable 512-byte (power-of-two) or 528-byte (standard DataFlash) page format - simplifies alignment with file systems |
| Sector lockdown & security register | Allows permanent locking of individual sectors and stores device-unique 64-byte ID plus 64-byte user space - meets secure boot requirements |
| Hardware + software protection | Combines WP pin-based sector lock with software-controlled sector protection register - provides layered defense against corruption |
Applications
| Embedded Firmware Storage | Secure Boot Loader |
|---|---|
|
Use Scenario: Storing and updating microcontroller firmware images in resource-constrained IoT edge nodes. IC Role / Device Role / Timing Role: Nonvolatile code storage with fast sequential read and in-system reprogrammability via SPI. Use Value: Continuous array read at 66 MHz enables zero-wait-state code execution from external memory, reducing MCU RAM footprint. |
Use Scenario: Verifying cryptographic signatures before loading bootloader code in automotive ECUs. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for signed firmware partitions and public keys. Use Value: Sector lockdown and unique 64-byte device ID prevent unauthorized firmware replacement and enable device authentication. |
| Data Logging in Industrial Sensors | Audio Buffering in Voice-Enabled Devices |
|
Use Scenario: Capturing timestamped sensor readings (e.g., temperature, pressure) in factory automation controllers. IC Role / Device Role / Timing Role: High-endurance sequential data recorder with page-erase granularity for efficient overwrite management. Use Value: 100,000 erase cycles per page and 20-year data retention ensure multi-year deployment without media wear-out. |
Use Scenario: Streaming recorded voice clips or TTS audio output in smart home speakers and intercoms. IC Role / Device Role / Timing Role: Low-latency audio frame buffer supporting real-time playback and background recording. Use Value: Dual SRAM buffers allow uninterrupted audio playback while new samples are written - eliminates audio dropouts. |
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; no SRAM buffers; 133MHz QSPI vs. 66MHz SPI; no sector lockdown or unique ID | Higher throughput for instruction fetch but lacks concurrent buffer operation and hardware security features | Choose for cost-sensitive, high-speed code XIP where security and streaming overlap are not required |
| Macronix MX25L3233FZNI-10G | 32Mb standard SPI NOR flash; 104MHz max clock; no dual buffers; no built-in security register or device ID | Compatible pinout and command set for basic code/data storage, but lacks DataFlash-specific streaming and protection capabilities | Choose for drop-in replacement in legacy SPI flash designs lacking buffer or security requirements |
Compared with W25Q32JVSSIQ and MX25L3233FZNI-10G, the AT45DB321D-CCU uniquely delivers concurrent buffer operation, hardware write protection with sector lockdown, and a factory-programmed unique identifier - making it the only option among the three suitable for secure, streaming-critical firmware and data logging applications.
Availability
AT45DB321D-CCU is available at Aetrix Electronics and suitable for embedded firmware storage, secure boot loader implementation, and industrial data logging requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT45DB321D-CCU 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 continues to manufacture and support the DataFlash product line, emphasizing reliability, longevity, and industrial-grade qualification.
The AT45DB321D-CCU belongs to the Atmel DataFlash family, designed specifically for high-reliability sequential-access applications where low pin count, concurrent buffering, and hardware-enforced security are essential - including medical devices, avionics subsystems, and industrial control firmware.
FAQ
What is the maximum clock frequency supported by the AT45DB321D-CCU during continuous array read?
The AT45DB321D-CCU supports up to 66 MHz for continuous array read using opcodes 0BH (high-frequency mode) and E8H (legacy mode), as specified by the fCAR1 parameter in the datasheet. This enables real-time code shadowing without wait states. The 03H low-frequency mode supports up to 33 MHz without dummy byte overhead. All modes maintain seamless wrap-around across page and array boundaries.
Does the AT45DB321D-CCU require external high-voltage programming circuitry?
No, the AT45DB321D-CCU operates entirely from a single 2.5V–3.6V supply for both read and program/erase operations. All internal programming voltages are generated on-chip, eliminating the need for external charge pumps or high-voltage generators. This simplifies PCB design and improves system safety, especially in battery-powered or low-voltage embedded applications using the AT45DB321D-CCU.
How does the dual-buffer architecture of the AT45DB321D-CCU improve system performance?
The AT45DB321D-CCU's two independent 512/528-byte SRAM buffers allow simultaneous host-to-buffer data transfer and buffer-to-flash programming. While one buffer streams incoming data (e.g., sensor logs), the other can be written to main memory - eliminating idle time between writes. This concurrency directly reduces effective write latency and enables sustained data capture rates unattainable with single-buffer flash devices like the AT45DB321D-CCU.
Can the AT45DB321D-CCU be used as a direct replacement for standard SPI NOR flash in existing designs?
The AT45DB321D-CCU shares SPI compatibility (modes 0 and 3) and similar pinout with many SPI NOR flash devices, but its command set, memory addressing model (page- vs. byte-addressed), and dual-buffer operation differ fundamentally. It is not a drop-in replacement. Migration requires firmware updates to leverage page-based access, buffer management, and DataFlash-specific opcodes - though benefits include faster streaming and enhanced security over standard NOR.
What security mechanisms does the AT45DB321D-CCU provide for protecting stored firmware?
The AT45DB321D-CCU provides hardware-level sector lockdown via the WP pin, software-controlled sector protection register, and a 128-byte security register containing a factory-programmed 64-byte unique device identifier plus 64 bytes of user-programmable space. These features collectively prevent unauthorized firmware modification, enable device authentication, and support secure boot chain integrity - capabilities not found in generic SPI flash parts.
AT45DB321D-CCU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 24-TBGA, CSPBGA
- Packaging:
- Tray
- 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:
- 24-CBGA (6x8)
AT45DB321D-CCU FAQ
1.How can I place an order for AT45DB321D-CCU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321D-CCU 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-CCU reliable?
The price and inventory of AT45DB321D-CCU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB321D-CCU is usually 5 days.
3.What payment methods are accepted for AT45DB321D-CCU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321D-CCU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321D-CCU?
AT45DB321D-CCU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321D-CCU 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-CCU?
For technical support, including AT45DB321D-CCU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321D-CCU requirements.
6.How does Aetrix verify that AT45DB321D-CCU is sourced from the original manufacturer or authorized distributors?
All AT45DB321D-CCU 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-CCU meets industry standards.
7.What is the process for return or replacement of AT45DB321D-CCU?
All AT45DB321D-CCU units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321D-CCU, 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-CCU part is unused and in its original packaging.
Return procedure for AT45DB321D-CCU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB321D-CCU Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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24LC01BT-I/SN
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