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Renesas AT25XE321D-DWF
- Part No.:
- AT25XE321D-DWF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- Die
- Datasheet:
-
AT25XE321D-DWF.pdf
- Description:
- 32 MBIT, WIDE VCC (1.65V TO 3.6V
- Quantity:
- Payment:
- Shipping:
Inventory:4,640
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Product details
Overview
AT25XE321D from Renesas Electronics is a 32-Mbit SPI serial Flash memory IC supporting 1.65 V–3.6 V operation, 133 MHz max clock frequency, quad I/O (1-4-4) and XiP modes, and 256-byte page erase-enabling efficient firmware storage and real-time code execution in battery-powered IoT edge nodes.
For engineers reviewing the AT25XE321D datasheet, AT25XE321D pinout, AT25XE321D application, or AT25XE321D equivalent, key selection criteria include multi-I/O bandwidth scalability, ultra-low-power deep power-down (5–7 nA), Read-Modify-Write command for EEPROM emulation, and JEDEC-standard hardware reset support.
Technical Context
The AT25XE321D implements a dual-mode SPI interface with configurable transfer protocols: standard single-I/O (1-1-1), dual-output (1-1-2), quad-output (1-1-4), quad I/O (1-4-4), and eXecute-in-Place (0-4-4). Its internal architecture integrates a 256-byte SRAM buffer, six status registers with volatile/non-volatile options, and OTP security registers for device authentication.
Memory management includes hierarchical erase granularity (256 B page, 4/32/64 kB blocks, full chip), nested program/erase suspend/resume capability, and individual block lock/unlock commands. Power control features include Deep Power-Down (B9h) and Ultra-Deep Power-Down (79h) with sub-10 nA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Range | 1.65 V – 3.6 V: Enables direct integration into single-cell Li-ion, coin-cell, and wide-input industrial power rails without level-shifting. |
| Max Clock Frequency | 133 MHz: Delivers up to 532 MB/s effective read throughput in quad I/O (1-4-4) mode for fast boot and XiP latency. |
| Erase Granularity | 256-byte page erase: Allows fine-grained data logging and parameter updates without disturbing adjacent firmware sectors. |
| Power Consumption | 5–7 nA UDPD current: Extends battery life in always-on sensor nodes by minimizing leakage during extended sleep cycles. |
| Endurance & Retention | 100,000 program/erase cycles / 20-year data retention: Supports field-upgradable firmware and long-life industrial deployments. |
| Security Features | 3 × 128-byte OTP registers + factory UID: Enables secure device identity binding, cryptographic key storage, and anti-cloning protection. |
| Interface Modes | SPI modes 0/3, 1-1-2, 1-1-4, 1-4-4, 0-4-4: Provides backward compatibility and scalable bandwidth for host MCU resource optimization. |
Pinout & Package
AT25XE321D is available in multiple industry-standard packages including 8-lead SOIC (150-mil and 208-mil), 8-pad DFN (5 × 6 × 0.6 mm), and 12-ball WLCSP. The DWF suffix corresponds to the 8-lead, 208-mil wide-body EIAJ SOIC package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS# | Chip Select | Active-low enable signal; initiates command sequence and controls SPI transaction boundaries. |
| SCK | Serial Clock | Master-generated clock synchronizing all data transfers; supports up to 133 MHz in quad I/O mode. |
| SI / IO0 | Serial Input / I/O0 | Primary input for commands, addresses, and data in single/dual/quad modes; bidirectional in quad I/O. |
| SO / IO1 | Serial Output / I/O1 | Primary output for read data; bidirectional in quad I/O mode for address/data multiplexing. |
| WP# / IO2 | Write Protect / I/O2 | Hardware write-protection input or bidirectional I/O pin in quad mode; enables flexible pin reuse. |
| HOLD# / RESET# / IO3 | Hold / Reset / I/O3 | Dual-function pin: suspends ongoing transfers (HOLD#) or performs hardware reset (RESET#); also serves as I/O3 in quad mode. |
Key Features
| Feature | Design Value |
|---|---|
| Read-Modify-Write (RMW) Command | Emulates byte-level SRAM writes in a single SPI command-eliminates external RAM buffering for small-data updates. |
| Active Status Interrupt | Automatically asserts interrupt to host when RDY/BSY bit clears-enables event-driven polling and reduces CPU overhead. |
| Flexible Memory Protection | Supports individual block lock, user-definable protected regions at memory start/end, and global lock-secures bootloader and calibration data. |
| Serial Flash Discoverable Parameters (SFDP) | JEDEC-compliant SFDP table (5Ah) provides runtime-configurable timing, voltage, and feature parameters-simplifies host driver portability. |
| Low-Battery Detect (LBD) | Monitors VCC and triggers EFh command alert-enables graceful shutdown or data save before brownout in battery systems. |
Applications
| IoT Edge Sensor Node | Industrial PLC Firmware Storage |
|---|---|
Use Scenario: Battery-powered environmental sensor collecting temperature/humidity every 5 seconds and storing logs locally. IC Role / Device Role / Timing Role: Non-volatile data logger with 256-byte page erase enabling efficient timestamped record updates without full-block erases. Use Value: 5–7 nA UDPD current extends 10-year battery life; RMW command eliminates need for external EEPROM. | Use Scenario: Field-upgradable ladder logic firmware stored in programmable logic controller with safety-critical boot partition. IC Role / Device Role / Timing Role: Primary program memory with individual block lock protecting bootloader region and quad I/O enabling fast firmware load during commissioning. Use Value: 133 MHz quad I/O read speed reduces boot time by >40% vs. legacy SPI Flash; 20-year data retention ensures long-term reliability. |
| Wearables Health Monitor | Smart Home Hub Boot Memory |
Use Scenario: Compact wearable tracking heart rate and motion, requiring secure firmware updates and encrypted health data storage. IC Role / Device Role / Timing Role: Secure code and configuration store using 3×128-byte OTP registers for key binding and factory UID for device attestation. Use Value: Hardware-based security prevents cloning; 1.65 V minimum supply allows operation down to near-dead battery voltage. | Use Scenario: Always-on home automation hub executing Linux kernel directly from Flash via XiP mode. IC Role / Device Role / Timing Role: eXecute-in-Place (XiP) memory supporting 0-4-4 continuous read mode to eliminate opcode overhead and sustain high instruction fetch bandwidth. Use Value: Quad I/O + continuous read cuts average instruction fetch latency by 65% vs. standard SPI, improving UI responsiveness. |
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 W25Q32JW | 32-Mbit, 1.7–3.6 V, 133 MHz, 4 KB sector/64 KB block erase only-no 256-byte page erase. | Lacks fine-grained data logging capability; requires software-managed wear leveling for frequent small writes. | Choose when cost sensitivity outweighs need for page-erase efficiency and RMW command. |
| Micron MT25QL32ABA | 32-Mbit, 2.7–3.6 V only; supports 133 MHz quad I/O but no Ultra-Deep Power-Down (<10 nA) or Low-Battery Detect. | Not suitable for sub-2.7 V battery systems; lacks autonomous low-power monitoring for brownout resilience. | Prefer for fixed-line industrial systems where wide voltage range and ultra-low-power sleep are not required. |
Compared with W25Q32JW and MT25QL32ABA, the AT25XE321D uniquely combines 256-byte page erase, 5–7 nA UDPD, and hardware LBD-making it optimal for energy-constrained, field-upgradable embedded systems requiring both code storage and secure data logging.
Availability
AT25XE321D is available at Aetrix Electronics and suitable for IoT edge sensor nodes, industrial PLC firmware storage, and wearables health monitors requiring stable component supply across multi-year production cycles.
Supply support for AT25XE321D 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
Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT markets.
The AT25XE321D belongs to Renesas' AT25XE family of high-performance serial Flash memories designed specifically for ultra-low-power, secure, and field-upgradable embedded systems.
FAQ
What is the maximum operating frequency supported by the AT25XE321D in quad I/O mode?
The AT25XE321D supports a maximum operating frequency of 133 MHz in quad I/O (1-4-4) mode. This enables up to 532 MB/s effective read throughput, critical for fast boot sequences and eXecute-in-Place (XiP) performance. The 133 MHz rating is specified under standard electrical conditions per the DS-AT25XE321D-160 Rev. P datasheet, and applies to both 1-4-4 and 0-4-4 continuous read operations. AT25XE321D maintains timing compliance across its full 1.65 V–3.6 V supply range.
Does the AT25XE321D support true byte-level programming without prior erase?
No-the AT25XE321D requires erase before program, but its Read-Modify-Write (RMW) command (0Ah) emulates byte-level writes in a single SPI transaction. This command internally reads the target page, modifies the specified byte(s), erases the page, and reprograms it-all transparently. AT25XE321D's 256-byte page erase minimizes disturbance compared to larger block erases, making RMW practical for infrequent small-data updates without external RAM buffering.
How does the Active Status Interrupt function in the AT25XE321D?
The AT25XE321D's Active Status Interrupt (25h command) automatically asserts an interrupt signal to the host MCU when the internal RDY/BSY bit transitions from busy to ready-indicating completion of program, erase, or power-up sequences. This eliminates polling overhead and enables deterministic scheduling of follow-up operations. The interrupt is latched and cleared by reading the status register. AT25XE321D supports this feature across all supported SPI modes and voltage ranges.
What package options are available for the AT25XE321D-DWF variant?
The AT25XE321D-DWF is specifically the 8-lead, 208-mil wide-body EIAJ SOIC package (ordering code DWF per Table 39 in DS-AT25XE321D-160 Rev. P). Other available packages include 8-lead 150-mil SOIC (DW), 8-pad DFN (5 × 6 × 0.6 mm, DNU), and 12-ball WLCSP-but these carry different suffixes and are not interchangeable with DWF without PCB redesign. AT25XE321D-DWF meets JEDEC MS-012 standards and is RoHS-compliant.
Can the AT25XE321D be used for eXecute-in-Place (XiP) applications?
Yes-the AT25XE321D fully supports eXecute-in-Place (XiP) via its 0-4-4 command format, which eliminates opcode transmission overhead during sequential instruction fetches. Combined with 133 MHz quad I/O bandwidth and continuous read mode, AT25XE321D delivers low-latency, high-throughput code execution directly from Flash-ideal for resource-constrained MCUs lacking external SDRAM. XiP operation is validated across the full -40°C to +85°C temperature range and 1.65 V–3.6 V supply.
AT25XE321D-DWF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- -
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH - NOR (SLC)
- Memory Size:
- 32Mbit
- Memory Organization:
- 4M x 8
- Memory Interface:
- SPI - Quad I/O
- Clock Frequency:
- 133 MHz
- Write Cycle Time - Word, Page:
- 32µs, 10.5ms
- Access Time:
- 8 ns
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Wafer
AT25XE321D-DWF FAQ
1.How can I place an order for AT25XE321D-DWF through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25XE321D-DWF 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 AT25XE321D-DWF reliable?
The price and inventory of AT25XE321D-DWF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25XE321D-DWF is usually 5 days.
3.What payment methods are accepted for AT25XE321D-DWF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25XE321D-DWF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25XE321D-DWF?
AT25XE321D-DWF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25XE321D-DWF 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 AT25XE321D-DWF?
For technical support, including AT25XE321D-DWF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25XE321D-DWF requirements.
6.How does Aetrix verify that AT25XE321D-DWF is sourced from the original manufacturer or authorized distributors?
All AT25XE321D-DWF 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 AT25XE321D-DWF meets industry standards.
7.What is the process for return or replacement of AT25XE321D-DWF?
All AT25XE321D-DWF units undergo pre-shipment inspection (PSI). If there is an issue with AT25XE321D-DWF, 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 AT25XE321D-DWF part is unused and in its original packaging.
Return procedure for AT25XE321D-DWF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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