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Renesas AT45DB321D-MU-SL955
- Part No.:
- AT45DB321D-MU-SL955
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
AT45DB321D-MU-SL955.pdf
- Description:
- IC FLASH 32MBIT SPI 66MHZ 8VDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,831
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Product details
Overview
AT45DB321D-MU-SL955 from Microchip Technology (formerly Atmel) is a 32Mb serial DataFlash memory IC with SPI-compatible RapidS interface, 512/528-byte page architecture, 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 throughput, and enables continuous array reads ideal for code shadowing in embedded systems.
For engineers reviewing the AT45DB321D-MU-SL955 datasheet, AT45DB321D-MU-SL955 pinout, AT45DB321D-MU-SL955 application, or AT45DB321D-MU-SL955 equivalent, key selection criteria include page size configurability (512 vs. 528 bytes), buffer-assisted streaming write capability, sector lockdown security, JEDEC ID compatibility, and industrial-grade reliability with 100,000 P/E cycles and 20-year data retention.
Technical Context
The AT45DB321D-MU-SL955 implements a sequential-access flash architecture with two independent 512/528-byte SRAM buffers that operate concurrently with main memory programming-enabling receive-while-program functionality. 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 comprises 8,192 pages (512 or 528 bytes each), grouped into 64 sectors (each containing variable-size sub-sectors: e.g., Sector 0a = 8 pages, Sector 0b = 120 pages). Erase granularity spans page (512B), block (4KB), sector (64KB), and chip (32Mb), all self-timed and monitored via RDY/BUSY pin and status register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 32Mb (34,603,008 bits) organized as 8,192 pages |
| Page size | Factory-configurable 512 bytes or 528 bytes per page |
| Interface speed | Up to 66MHz SCK for continuous array read (0BH/E8H) |
| Supply voltage | Single 2.5V–3.6V or 2.7V–3.6V rail; no high-voltage programming required |
| Power consumption | 7mA typical active read current; 25µA standby; 15µA deep power-down |
| Data retention | 20 years minimum at industrial temperature range (–40°C to +85°C) |
| Endurance | 100,000 program/erase cycles per page minimum |
Pinout & Package
VDFN (MLF) 8-pin package (3mm × 4mm, 0.5mm pitch), with exposed metal pad on bottom (floating or GND-connected).
| 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 | Input clock controlling data transfer timing; SI latched on rising edge, SO driven on falling edge |
| SI | Serial Input | Command, address, and data input line; MSB-first protocol |
| SO | Serial Output | Command response, status, and data output line; open-drain capable for bus sharing |
| WP | Write Protect | Hardware-level sector protection override; low state blocks program/erase regardless of software settings |
| RESET | Reset | Active-low hard reset; terminates ongoing operations and returns state machine to idle |
| RDY/BUSY | Ready/Busy indicator | Open-drain output pulled high externally; driven low during self-timed operations (program/erase/buffer transfers) |
| VCC / GND | Power supply | Single 2.5V–3.6V supply; internal power-on reset eliminates external reset circuitry requirement |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM buffers | Two independent 512/528-byte buffers enable simultaneous reception and flash reprogramming-critical for real-time firmware updates |
| Continuous array read | Zero-address-wrap read across page boundaries and full memory wrap-around (E8H/0BH/03H) eliminates CPU overhead for streaming code execution |
| Flexible erase hierarchy | Four-level erase (page/block/sector/chip) allows precise wear leveling and partial field updates without full chip erasure |
| Sector lockdown security | Per-sector hardware lock prevents unauthorized modification of secured boot code or calibration data-even if WP is inactive |
| Unique device ID | 64-byte factory-programmed identifier enables secure device authentication and traceability in production and field deployments |
Applications
| Industrial HMI Firmware Storage | Medical Device Boot Code Vault |
|---|---|
Use Scenario: Storing and executing GUI assets, configuration profiles, and firmware images in panel-mounted HMIs operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile storage and direct code shadowing source for ARM Cortex-M microcontrollers via SPI. Use Value: Continuous array read (0BH) enables zero-latency instruction fetch; 20-year retention ensures long-term deployment integrity without recalibration. | Use Scenario: Securing certified bootloader and regulatory-compliant diagnostic routines in portable ultrasound and infusion pumps. IC Role / Device Role / Timing Role: Trusted code repository with hardware-enforced sector lockdown and unique device ID for FDA audit traceability. Use Value: WP pin + sector lockdown prevents tampering; 100,000 P/E cycles support frequent clinical software updates over 10+ year product lifecycle. |
| Automotive Telematics Log Buffer | Smart Meter Firmware & Calibration Archive |
Use Scenario: Capturing CAN bus diagnostics, GPS logs, and crash-event snapshots in vehicle telematics control units (TCUs). IC Role / Device Role / Timing Role: High-speed sequential write buffer (via dual SRAM) synchronized with microcontroller DMA for burst logging. Use Value: Buffer-to-page program with built-in erase (83H/86H) ensures atomic log commits; industrial temp rating guarantees operation at –40°C engine bay mounting. | Use Scenario: Archiving firmware revisions, metrology calibration coefficients, and tariff tables in ANSI C12.22-compliant smart electricity meters. IC Role / Device Role / Timing Role: Secure, long-life nonvolatile memory with JEDEC ID verification and sector-level write protection for regulatory compliance. Use Value: 64-byte security register stores cryptographic keys; 25µA standby current extends battery backup life beyond 10 years in meter tamper-detection mode. |
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 interface (IO0–IO3); no SRAM buffers; 133MHz max clock | Lacks buffer-assisted streaming; requires software-managed erase before write; no sector lockdown or unique ID | Choose for higher raw throughput in fixed-code applications where concurrent read/write is unnecessary |
| Macronix MX25L3233FZNI-10G | 32Mb standard SPI NOR flash; 104MHz max clock; no dual buffers; 64-byte security register optional | No built-in buffer concurrency; no RDY/BUSY pin (relies on status register polling); no factory device ID | Choose for cost-sensitive designs requiring JEDEC ID compatibility but not advanced streaming or security features |
Compared with W25Q32JVSSIQ and MX25L3233FZNI-10G, the AT45DB321D-MU-SL955 uniquely delivers true concurrent buffer access, hardware sector lockdown, and guaranteed 20-year data retention-making it optimal for safety-critical, field-upgradable, and long-lifecycle embedded systems where data integrity and update atomicity are mandatory.
Availability
AT45DB321D-MU-SL955 is available at Aetrix Electronics and suitable for industrial HMI firmware storage, medical device boot code vaulting, and automotive telematics log buffering requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.
Supply support for AT45DB321D-MU-SL955 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 DataFlash product family, emphasizing reliability, longevity, and industrial qualification.
The AT45DB321D-MU-SL955 belongs to the Atmel DataFlash® series-designed specifically for high-density, low-pin-count, sequential-access flash applications where SPI simplicity, buffer-assisted streaming, and hardware security outweigh random-access performance needs.
FAQ
What is the default page size configuration for AT45DB321D-MU-SL955?
The AT45DB321D-MU-SL955 is factory preconfigured for 512-byte pages. This binary-aligned size simplifies address arithmetic in microcontroller firmware and aligns with common EEPROM emulation requirements. The 528-byte alternative is available only via factory customization-not user-selectable in the field-and requires corresponding changes to address bit mapping (PA12–PA0 + BA9–BA0 vs. A21–A0).
Does AT45DB321D-MU-SL955 support Quad SPI or QPI interface modes?
No, the AT45DB321D-MU-SL955 supports only standard SPI (modes 0 and 3) with SI/SO bidirectional signaling. It does not implement Quad SPI, QPI, or any multi-I/O protocols. Its RapidS interface achieves up to 66MHz throughput using a 3-wire (SI/SO/SCK) or 4-wire (with RDY/BUSY) configuration-optimized for simplicity and noise immunity rather than parallel bandwidth.
How does the RDY/BUSY pin function during a buffer-to-main-memory program operation in AT45DB321D-MU-SL955?
During a buffer-to-main-memory page program (e.g., opcode 83H/86H), the RDY/BUSY pin is actively driven low for the entire self-timed duration-including both erase and program phases (max tEP). This provides hardware-synchronized readiness indication, eliminating the need for status register polling. The pin returns high only after the operation completes successfully or fails, enabling deterministic timing in real-time systems using AT45DB321D-MU-SL955.
Can AT45DB321D-MU-SL955 be used as a direct replacement for AT45DB321C-MU?
Yes, AT45DB321D-MU-SL955 is the qualified successor to AT45DB321C-MU with identical pinout, timing, command set, and electrical specifications. Key improvements include enhanced ESD robustness, tighter tCAR1/tCAR2 timing margins, and updated process technology-fully backward compatible for drop-in replacement in existing designs without layout or firmware changes.
What security mechanisms does AT45DB321D-MU-SL955 provide beyond software write protection?
AT45DB321D-MU-SL955 provides three hardware-enforced security layers: (1) WP pin-physically disables all program/erase commands when asserted; (2) sector lockdown-permanently locks protected sectors even after power cycle; (3) 128-byte security register with 64-byte user-programmable space and 64-byte unique factory ID-enabling cryptographic key binding and device-level authentication. These operate independently of firmware control.
AT45DB321D-MU-SL955 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 32Mbit
- Memory Organization:
- 512 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:
- 8-VDFN (6x5)
AT45DB321D-MU-SL955 FAQ
1.How can I place an order for AT45DB321D-MU-SL955 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321D-MU-SL955 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-MU-SL955 reliable?
The price and inventory of AT45DB321D-MU-SL955 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB321D-MU-SL955 is usually 5 days.
3.What payment methods are accepted for AT45DB321D-MU-SL955?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321D-MU-SL955 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321D-MU-SL955?
AT45DB321D-MU-SL955 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321D-MU-SL955 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-MU-SL955?
For technical support, including AT45DB321D-MU-SL955 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321D-MU-SL955 requirements.
6.How does Aetrix verify that AT45DB321D-MU-SL955 is sourced from the original manufacturer or authorized distributors?
All AT45DB321D-MU-SL955 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-MU-SL955 meets industry standards.
7.What is the process for return or replacement of AT45DB321D-MU-SL955?
All AT45DB321D-MU-SL955 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321D-MU-SL955, 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-MU-SL955 part is unused and in its original packaging.
Return procedure for AT45DB321D-MU-SL955:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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