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Renesas AT45DB321D-CU-SL383
- Part No.:
- AT45DB321D-CU-SL383
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 24-TBGA, CSPBGA
- Datasheet:
-
AT45DB321D-CU-SL383.pdf
- Description:
- IC FLASH 32MBIT SPI 66MHZ 24CBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,699
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Product details
Overview
AT45DB321D-CU-SL383 from Microchip Technology (formerly Atmel) is a 32Mb serial DataFlash memory IC with SPI-compatible RapidS interface, 512/528-byte page size, dual 512/528-byte SRAM buffers, and industrial temperature support. It enables high-speed code shadowing and in-system reprogrammability in embedded systems requiring low-pin-count, low-voltage (2.5V–3.6V), and robust data retention.
For engineers reviewing the AT45DB321D-CU-SL383 datasheet, AT45DB321D-CU-SL383 pinout, AT45DB321D-CU-SL383 application, or AT45DB321D-CU-SL383 equivalent, key selection criteria include page-program timing, buffer-to-flash transfer capability, sector lockdown security, RDY/BUSY signaling, and compatibility with SPI Mode 0/3 at up to 66MHz.
Technical Context
The AT45DB321D-CU-SL383 implements a sequential-access flash architecture with two independent 512/528-byte SRAM buffers enabling concurrent data reception and flash reprogramming. Its RapidS serial interface supports SPI Modes 0 and 3 with programmable page size (factory-configurable for 512 bytes) and self-timed erase/program operations.
Memory organization comprises 8,192 pages (512 or 528 bytes each), grouped into sectors (64KB), blocks (4KB), and pages (512/528B), supporting granular erasure - page (512B), block (4KB), sector (64KB), or chip (32Mb). The RDY/BUSY open-drain output signals active internal operations without halting host communication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 32Mb (34,603,008 bits), organized as 8,192 pages of 512 or 528 bytes |
| Interface speed | Up to 66MHz SCK for continuous array read (0BH/E8H opcodes); supports SPI Modes 0 and 3 |
| Supply voltage | 2.5V–3.6V or 2.7V–3.6V single supply; no high-voltage programming required |
| Power consumption | 7mA typical active read current; 25µA standby; 15µA deep power-down |
| Erase endurance | 100,000 program/erase cycles per page minimum |
| 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); sector lockdown |
Pinout & Package
AT45DB321D-CU-SL383 is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with standard pinout and 1.27mm pitch. This RoHS-compliant, green package supports surface-mount assembly and industrial thermal requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates command sequence on high-to-low transition; deassertion places device in standby (SO tri-stated) |
| SCK | Serial Clock | Controls data flow; SI latched on rising edge, SO clocked out on falling edge |
| SI | Serial Input | Command, address, and data input path; MSB-first protocol |
| SO | Serial Output | Data output path; supports continuous read without address retransmission |
| WP | Write Protect | Hardware-level sector protection override; low-active; independent of software protection |
| RESET | Reset | Active-low termination of ongoing operation; resets internal 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 / Ground | Single 2.5V–3.6V supply; GND serves as reference for all I/O and internal logic |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM buffers (512/528B each) | Enables simultaneous data streaming into one buffer while reprogramming flash from the other - critical for real-time firmware updates |
| Flexible page size (512 or 528B) | Factory-configurable 512B mode simplifies byte-aligned addressing and eliminates padding overhead in embedded file systems |
| Continuous array read (E8H/0BH/03H) | Eliminates address retransmission across page boundaries; supports seamless code shadowing from flash to RAM |
| Sector lockdown & security register | Allows permanent write-protection of boot code or calibration data via hardware-enforced sector isolation |
| JEDEC-standard ID read | Enables automated BOM verification and field firmware validation using manufacturer/device ID (0x1F 0x26) |
Applications
| Boot Code Storage | Firmware Over-the-Air (OTA) Update |
|---|---|
Use Scenario: Storing primary bootloader and secure boot images in resource-constrained microcontroller-based devices. IC Role / Device Role / Timing Role: Nonvolatile storage for immutable startup instructions; accessed sequentially during cold boot via continuous read mode. Use Value: Enables deterministic boot latency (<5ms page access) and immunity to corruption via sector lockdown and hardware WP pin. | Use Scenario: Receiving and staging new firmware images in connected IoT edge nodes with limited RAM. IC Role / Device Role / Timing Role: Dual-buffer architecture allows background download into Buffer 1 while executing from main memory, then atomic swap via buffer-to-page program. Use Value: Eliminates need for external RAM buffering; supports zero-downtime updates with verified integrity before activation. |
| Data Logging with Timestamping | Audio Voice Recording |
Use Scenario: Industrial sensor nodes logging timestamped analog measurements over weeks without host intervention. IC Role / Device Role / Timing Role: High-endurance page-erasable storage for cyclic ring buffers; leverages 100K-cycle rating per page. Use Value: Extends field lifetime beyond 10 years under typical logging duty cycle; avoids wear leveling firmware complexity. | Use Scenario: Portable voice recorders capturing mono PCM audio at 8–16kHz sampling rates. IC Role / Device Role / Timing Role: Sequential-access flash optimized for sustained 1–2MB/s read/write throughput using continuous array read and buffer streaming. Use Value: Delivers >1 hour of CD-quality voice recording in compact 8-pin SOIC footprint with no external controller overhead. |
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-wire QSPI interface; no dual SRAM buffers; 1.8V–3.6V supply | Lacks built-in buffer streaming; requires external DMA or CPU-managed page management for OTA | Preferred when QSPI bandwidth >66MHz is needed and buffer-assisted streaming is not required |
| Macronix MX25L3233FZUI-12G | 32Mb standard SPI NOR flash; 2.7V–3.6V; no configurable page size; no security register or sector lockdown | No hardware write protection or unique ID; relies on software-based security schemes | Suitable for cost-sensitive consumer applications where security and endurance are secondary |
Compared with W25Q32JVSSIQ and MX25L3233FZUI-12G, the AT45DB321D-CU-SL383 uniquely delivers dual-buffer streaming, factory-configurable 512B pages, and hardware-enforced sector lockdown - making it optimal for safety-critical boot storage and secure OTA update pipelines where deterministic timing and tamper resistance are mandatory.
Availability
AT45DB321D-CU-SL383 is available at Aetrix Electronics and suitable for boot code storage, firmware OTA updates, industrial data logging, and voice recording applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT45DB321D-CU-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 datasheets, errata, and long-term manufacturing commitments.
The AT45DB321D-CU-SL383 belongs to the Atmel DataFlash family - designed specifically for sequential-access, high-reliability embedded storage where low pin count, integrated buffering, and hardware security outweigh random-access performance needs.
FAQ
What is the default page size configuration for AT45DB321D-CU-SL383?
The AT45DB321D-CU-SL383 is factory preconfigured for 512-byte pages. This setting eliminates padding overhead and simplifies alignment in embedded filesystems. While 528-byte mode is supported via configuration registers, the SL383 variant ships with 512B enabled by default - confirmed in Atmel datasheet revision 3597Q–DFLASH–6/11, Section 1.1 and Table 2-1.
Does AT45DB321D-CU-SL383 support true SPI Mode 0 and Mode 3 operation?
Yes, AT45DB321D-CU-SL383 fully supports SPI Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) as defined in the RapidS interface specification. Clock polarity and phase are handled internally; no mode-switching firmware overhead is required. Maximum SCK frequency remains 66MHz in both modes, validated per datasheet AC characteristics table (fCAR1).
How does the RDY/BUSY pin behave during buffer-to-main-memory programming in AT45DB321D-CU-SL383?
During buffer-to-main-memory programming (opcodes 83H/86H), the RDY/BUSY pin is actively driven low for the entire self-timed duration (tEP ≤ 20ms max), indicating that the flash array is unavailable. However, the non-involved SRAM buffer remains accessible for concurrent data loading - a key differentiator from standard SPI NOR devices. This behavior is documented in Section 5.2 and Figure 1-1 of the AT45DB321D-CU-SL383 datasheet.
Can AT45DB321D-CU-SL383 be used without connecting the RESET pin?
Yes, AT45DB321D-CU-SL383 can operate with RESET tied permanently high, as it includes an internal power-on reset circuit. The datasheet explicitly states "no restrictions on the RESET pin during power-on sequences" and recommends external high-bias if unused. Leaving RESET unconnected is not advised due to potential noise susceptibility; a 10kΩ pull-up to VCC is the validated implementation for AT45DB321D-CU-SL383.
What is the purpose of the 128-byte security register in AT45DB321D-CU-SL383?
The 128-byte security register in AT45DB321D-CU-SL383 contains 64 bytes of user-programmable space (for keys, certificates, or calibration data) and a factory-programmed 64-byte unique device identifier. It supports sector lockdown commands to permanently prevent modification of protected sectors - providing hardware-rooted security for boot code or sensitive parameters. This feature is distinct from software-only locks and is enforced independently of WP pin state.
AT45DB321D-CU-SL383 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 24-TBGA, CSPBGA
- 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:
- 24-CBGA (6x8)
AT45DB321D-CU-SL383 FAQ
1.How can I place an order for AT45DB321D-CU-SL383 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321D-CU-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-CU-SL383 reliable?
The price and inventory of AT45DB321D-CU-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-CU-SL383 is usually 5 days.
3.What payment methods are accepted for AT45DB321D-CU-SL383?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321D-CU-SL383 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321D-CU-SL383?
AT45DB321D-CU-SL383 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321D-CU-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-CU-SL383?
For technical support, including AT45DB321D-CU-SL383 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321D-CU-SL383 requirements.
6.How does Aetrix verify that AT45DB321D-CU-SL383 is sourced from the original manufacturer or authorized distributors?
All AT45DB321D-CU-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-CU-SL383 meets industry standards.
7.What is the process for return or replacement of AT45DB321D-CU-SL383?
All AT45DB321D-CU-SL383 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321D-CU-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-CU-SL383 part is unused and in its original packaging.
Return procedure for AT45DB321D-CU-SL383:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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