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Renesas AT25DF321A-CCU
- Part No.:
- AT25DF321A-CCU
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 9-UBGA
- Datasheet:
-
AT25DF321A-CCU.pdf
- Description:
- IC FLASH 32MBIT SPI 100MHZ 9UBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,955
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Product details
Overview
AT25DF321A-CCU from Adesto Technologies (now part of Dialog Semiconductor) is a 32-Mbit serial Flash memory IC designed for code shadowing and mixed code/data storage in embedded systems. It operates from a single 2.7V–3.6V supply, supports SPI Modes 0/3 and RapidS protocol, delivers up to 100MHz read speed with 5ns clock-to-output delay, and integrates hardware write protection via WP pin for secure firmware updates in industrial controllers.
For engineers reviewing the AT25DF321A-CCU datasheet, AT25DF321A-CCU pinout, AT25DF321A-CCU application, or AT25DF321A-CCU equivalent, key selection criteria include its 4-Kbyte/32-Kbyte/64-Kbyte uniform erase granularity, dual-input/dual-output programming/reading capability, sector lockdown for permanent read-only protection, 128-byte OTP security register, and industrial temperature range support.
Technical Context
The AT25DF321A-CCU implements a flexible erase architecture with four physical erase granularities (4-Kbyte, 32-Kbyte, 64-Kbyte blocks, and full chip), enabling efficient code patching and data logging without over-erasing. Its memory array is partitioned into 64 uniform 64-Kbyte sectors, each individually protectable via software commands or hardware WP pin assertion.
It features dual-mode I/O operation: SI/SO pins become bidirectional (SIO/SOI) during Dual-Input Program and Dual-Output Read, doubling effective throughput at same clock frequency. The device includes dedicated status register bits for program/erase failure detection, suspend/resume control, and deep power-down (5µA typical) for ultra-low-power retention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (4 MByte) - sufficient for boot code, firmware images, and configuration data in resource-constrained microcontrollers. |
| Supply Voltage | 2.7V–3.6V - compatible with standard 3V logic systems; no VPP or auxiliary voltage required for programming/erasing. |
| Max Read Frequency | 100 MHz (RapidS mode) - enables sub-40ns access time per byte, critical for high-speed code execution from Flash. |
| Block Erase Times | 50ms (4-Kbyte), 250ms (32-Kbyte), 400ms (64-Kbyte) - balances speed and endurance for frequent partial updates. |
| Endurance & Retention | 100,000 program/erase cycles / 20-year data retention - meets long-life requirements for industrial and automotive ECUs. |
| Power Consumption | 12mA active read current (20MHz), 5µA deep power-down - supports battery-backed or energy-harvesting applications. |
| Operating Temperature | −40°C to +85°C - qualified for full industrial environment operation without derating. |
Pinout & Package
AT25DF321A-CCU is packaged in an 8-lead SOIC (208-mil wide), pin-compatible with industry-standard serial Flash footprints. All signals conform to SPI bus conventions with added HOLD and WP functionality for system-level control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates all commands and places SO in high-Z when deasserted - essential for multi-device SPI bus sharing. |
| SCK | Serial Clock | Master-generated clock; data latched on rising edge (SI), output on falling edge (SO) - defines timing for all SPI transactions. |
| SI (SIO) | Serial Input / Dual-Output Read | Primary command/address/data input; becomes output during Dual-Output Read to deliver bit[6:7] of each byte - doubles read bandwidth. |
| SO (SOI) | Serial Output / Dual-Input Program | Primary data output; becomes input during Dual-Input Program to accept bit[6:7] - enables faster page programming. |
| WP | Write Protect | Hardware lock for protected sectors; low-active signal prevents accidental writes - used with software protection for defense-in-depth security. |
| HOLD | Communication Suspend | Pauses ongoing SPI transfer without deselecting device; requires CS asserted and SCK low - preserves state during interrupt servicing. |
| VCC | Power Supply | 2.7V–3.6V input; powers internal logic, charge pumps, and I/O buffers - eliminates need for external voltage translators. |
| GND | Ground Reference | Common return path for VCC and all I/O signals - must be low-impedance to maintain signal integrity and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Output Read Array | Delivers two bits per SCK cycle (SO+SIO), achieving 2× effective read bandwidth vs. standard SPI - reduces boot time in MCU-based systems. |
| Sector Lockdown | Permanently disables program/erase on any combination of 64-Kbyte sectors after freeze command - prevents tampering with bootloader or crypto keys. |
| 128-Byte OTP Security Register | One-time programmable space for ESN, device serial number, or cryptographic keys - provides immutable identity binding without external secure element. |
| Flexible Erase Granularity | Supports 4-Kbyte, 32-Kbyte, 64-Kbyte, and full-chip erase - minimizes wasted space and wear leveling overhead in mixed code/data layouts. |
| Program/Erase Suspend | Halts active program/erase cycle to service higher-priority reads - ensures deterministic latency for real-time applications like motor control. |
Applications
| Industrial PLC Firmware Storage | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Storing and updating ladder logic firmware and I/O configuration tables in programmable logic controllers. IC Role / Device Role / Timing Role: Non-volatile code storage with secure update capability; executes code via XIP or shadow load to RAM. Use Value: 4-Kbyte block erase enables patching individual function blocks without erasing entire firmware image, reducing field update risk and downtime. |
Use Scenario: Holding calibrated sensor parameters, actuator lookup tables, and diagnostic event logs in vehicle body electronics. IC Role / Device Role / Timing Role: Mixed code-and-data Flash memory supporting both boot firmware and runtime parameter storage. Use Value: Sector lockdown protects calibration data against unauthorized modification, while OTP register stores unique VIN-linked identifiers for traceability. |
| Medical Infusion Pump Bootloader | Smart Energy Meter Firmware |
|
Use Scenario: Hosting certified bootloader and safety-critical application firmware requiring regulatory-compliant update mechanisms. IC Role / Device Role / Timing Role: Secure, tamper-resistant storage for signed firmware images and cryptographic verification keys. Use Value: Hardware WP pin + software sector protection + OTP register together satisfy IEC 62304 Class C software update requirements. |
Use Scenario: Storing tariff schedules, communication stack binaries, and encrypted metering history in ANSI C12.19-compliant utility meters. IC Role / Device Role / Timing Role: High-reliability Flash memory operating continuously at 85°C ambient with 20-year data retention. Use Value: 100,000-cycle endurance and industrial temp rating ensure 15+ year field life without data corruption in sealed outdoor enclosures. |
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 | 32-Mbit, 1.8V–3.6V supply, 133MHz max read, no RapidS or dual-I/O modes, 16-Kbyte/64-Kbyte erase blocks | Lacks sector lockdown and OTP register; uses simpler protection scheme | Choose for cost-sensitive designs where advanced security and fine-grain erase are not required. |
| Macronix MX25L3233FZBI-10G | 32-Mbit, 2.7V–3.6V supply, 104MHz max read, supports Quad SPI but no dual-input program, 4-Kbyte/32-Kbyte/64-Kbyte erase | Offers Quad I/O for higher bandwidth but no hardware WP pin or sector lockdown | Prefer when system requires >100MHz read throughput and supports QSPI interface, but does not require permanent lockdown. |
Compared with W25Q32JVSSIQ and MX25L3233FZBI-10G, the AT25DF321A-CCU uniquely combines RapidS acceleration, dual-input/dual-output operation, hardware-assisted sector lockdown, and integrated OTP security - making it optimal for safety-critical or anti-tamper applications where firmware integrity is non-negotiable.
Availability
AT25DF321A-CCU is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, medical devices, and smart metering applications requiring stable component supply across extended product lifecycles.
Supply support for AT25DF321A-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
Adesto Technologies, acquired by Dialog Semiconductor in 2020, specialized in low-power, high-performance non-volatile memory and IoT connectivity solutions.
The AT25DF321A-CCU belongs to Adesto's DataFlash® family, engineered specifically for embedded systems needing fast, secure, and flexible serial Flash with enhanced reliability in harsh environments.
FAQ
What is the maximum clock frequency supported by AT25DF321A-CCU in RapidS mode?
The AT25DF321A-CCU supports up to 100 MHz in RapidS mode, enabling high-speed sequential reads with minimal latency. This mode requires the 1Bh opcode and two dummy bytes after the address. The device achieves a maximum clock-to-output delay (tV) of 5 ns, making it suitable for demanding real-time boot and code-execution scenarios. AT25DF321A-CCU maintains full functionality at this rate without requiring special timing margins beyond those specified in the datasheet.
Does AT25DF321A-CCU support hardware write protection independent of software commands?
Yes, AT25DF321A-CCU includes a dedicated WP (Write Protect) pin that provides hardware-level locking of protected sectors when driven low. This feature operates independently of software protection commands and remains active even if the device resets or loses power. The WP pin is internally pulled high, so it may be left floating if unused, though external connection to VCC is recommended for noise immunity. AT25DF321A-CCU thus offers defense-in-depth security combining hardware and software protection layers.
Can AT25DF321A-CCU perform simultaneous read and program operations?
No, AT25DF321A-CCU does not support true concurrent read and program operations. However, it provides Program/Erase Suspend and Resume commands (B0h/D0h opcodes) that allow an active program or erase cycle to be temporarily halted to service urgent read requests. Once the read completes, the suspended operation resumes automatically. This capability ensures deterministic response times in real-time systems without requiring full abort/restart sequences. AT25DF321A-CCU implements this via internal status flag management and does not require external arbitration.
What package type is used for AT25DF321A-CCU, and is it RoHS compliant?
AT25DF321A-CCU is supplied in an 8-lead SOIC package (208-mil width), which is industry-standard and compatible with automated PCB assembly processes. It is fully RoHS compliant, halide-free, and lead-free per JEDEC J-STD-020, meeting global environmental regulations including EU Directive 2011/65/EU. The package also complies with moisture sensitivity level (MSL) 3 per J-STD-020, requiring bake conditioning only if exposed to ambient for >168 hours before reflow. AT25DF321A-CCU carries no exemptions and is suitable for green manufacturing.
How does the sector lockdown feature work in AT25DF321A-CCU?
The sector lockdown feature in AT25DF321A-CCU allows any combination of its 64 physical 64-Kbyte sectors to be permanently set as read-only using the 33h (Sector Lockdown) and 34h (Freeze Sector Lockdown State) commands. Once frozen, lockdown status cannot be reversed - even by power cycling or issuing unprotect commands. This provides irreversible protection for bootloader code, cryptographic keys, or calibration data. AT25DF321A-CCU validates lockdown state on every access attempt and returns status flags indicating locked sectors, ensuring robust enforcement at silicon level.
AT25DF321A-CCU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 9-UBGA
- Packaging:
- Tray
- Product Status:
- Discontinued at Digi-Key
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 32Mbit
- Memory Organization:
- 256 Bytes x 16384 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 100 MHz
- Write Cycle Time - Word, Page:
- 7µs, 3ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-UBGA (6x6)
AT25DF321A-CCU FAQ
1.How can I place an order for AT25DF321A-CCU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25DF321A-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 AT25DF321A-CCU reliable?
The price and inventory of AT25DF321A-CCU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25DF321A-CCU is usually 5 days.
3.What payment methods are accepted for AT25DF321A-CCU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25DF321A-CCU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25DF321A-CCU?
AT25DF321A-CCU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25DF321A-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 AT25DF321A-CCU?
For technical support, including AT25DF321A-CCU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25DF321A-CCU requirements.
6.How does Aetrix verify that AT25DF321A-CCU is sourced from the original manufacturer or authorized distributors?
All AT25DF321A-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 AT25DF321A-CCU meets industry standards.
7.What is the process for return or replacement of AT25DF321A-CCU?
All AT25DF321A-CCU units undergo pre-shipment inspection (PSI). If there is an issue with AT25DF321A-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 AT25DF321A-CCU part is unused and in its original packaging.
Return procedure for AT25DF321A-CCU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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