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Renesas AT25SL321-MBUE-T
- Part No.:
- AT25SL321-MBUE-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT25SL321-MBUE-T.pdf
- Description:
- IC FLASH 32MBIT SPI/QUAD 8USON
- Quantity:
- Payment:
- Shipping:
Inventory:529,195
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Product details
Overview
AT25SL321-MBUE-T from Renesas Electronics is a 32-Mbit serial flash memory IC operating from 1.7 V to 2.0 V, supporting SPI, Dual I/O, Quad I/O, and QPI interfaces with up to 104 MHz clock frequency, 6 ns clock-to-output delay, and 65 MB/s continuous data transfer - deployed in embedded boot code storage, firmware update partitions, and configuration data retention for industrial controllers.
For engineers reviewing the AT25SL321-MBUE-T datasheet, AT25SL321-MBUE-T pinout, AT25SL321-MBUE-T application, or AT25SL321-MBUE-T equivalent, key selection criteria include single-supply 1.7–2.0 V operation, JEDEC-compliant SFDP register support, hardware write protection via WP pin, 4-kbit secured OTP, and industrial temperature range (−40 °C to +85 °C) compliance.
Technical Context
The AT25SL321-MBUE-T implements a flexible erase architecture with four block sizes (4 kB, 32 kB, 64 kB, and full chip), enabling efficient code and data partitioning without memory waste. Its dual/quad I/O and QPI modes use shared I/O pins (IO0–IO3) to achieve higher throughput than standard SPI while maintaining backward command compatibility.
It integrates a volatile status register with Quad Enable (QE) bit, SRP0/SRP1-based hardware write protection, and dedicated ACC pin for accelerated programming. Erase/program suspend/resume functionality allows concurrent background operations, and Deep Power-Down mode draws only 2 µA typical current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (4 MB), organized as 16,384 × 256-byte pages |
| Supply Voltage | 1.7 V to 2.0 V - enables direct interface with low-voltage SoCs and avoids level-shifting in 1.8 V systems |
| Max Clock Frequency | 104 MHz in QPI mode - delivers 532 MHz equivalent bandwidth using Quad I/O Fast Read |
| Read Latency | 6 ns clock-to-output (tV1) - supports tight timing margins in high-speed boot loaders |
| Page Program Time | 0.6 ms typical (256 bytes) - enables rapid field firmware patching |
| Block Erase Times | 60 ms (4 kB), 200 ms (32 kB), 350 ms (64 kB) - balances granularity and speed for code/data updates |
| Endurance & Retention | 100,000 program/erase cycles; 20-year data retention - suitable for long-life industrial deployments |
Pinout & Package
AT25SL321-MBUE-T is packaged in an 8-pad UDFN (6 × 5 × 0.6 mm) per Renesas ordering information and package drawings. Pin functions are validated per DS-AT25SL321-112 Rev. K, Page 8–9.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must fall before any command; requires 10 kΩ pull-up to VCC for reliable power-up sequencing |
| SCK | Serial Clock | Input timing reference; data latched on rising edge, output shifted on falling edge |
| SI (IO0) | Serial Input / I/O0 | Primary data input in SPI; bidirectional in Dual/Quad I/O and QPI modes |
| SO (IO1) | Serial Output / I/O1 | Primary data output in SPI; bidirectional in Dual/Quad I/O and QPI modes |
| WP (IO2, ACC) | Write Protect / Acceleration | Hardware lock for protected blocks; doubles as 9 V ACC pin for accelerated programming |
| HOLD (IO3) | Hold Input / I/O3 | Suspends ongoing serial transfer without deselecting device; bidirectional in extended modes |
| VCC | Power Supply | 1.7–2.0 V core supply; powers internal logic, charge pump, and I/O buffers |
| GND | Ground | Reference for all I/O and internal circuitry; must be low-impedance connection |
Key Features
| Feature | Design Value |
|---|---|
| Quad Peripheral Interface (QPI) | Enables 4-bit-wide command/address/data transfers, reducing instruction overhead and improving throughput vs. standard SPI |
| Serial Flash Discoverable Parameters (SFDP) | JEDEC-standard register allowing host to auto-detect density, timing, erase granularity, and feature set without hard-coded assumptions |
| Secured One-Time Programmable Register | 4-kbit OTP space with hardware locking - stores cryptographic keys, calibration data, or unique identifiers with tamper resistance |
| Erase/Program Suspend & Resume | Permits interruption of long erase/program operations to service time-critical reads, then resume without data loss |
| Flexible Block Erase Architecture | Four discrete erase granularities (4/32/64 kB + full chip) minimize wasted space when updating mixed code/data segments |
Applications
| Boot Code Storage | Firmware Update Partition |
|---|---|
Use Scenario: Storing primary bootloader and initial firmware image for microcontrollers in industrial gateways. IC Role / Device Role / Timing Role: Nonvolatile storage for XIP-capable or shadow-loaded boot code; accessed during cold start and reset sequences. Use Value: 104 MHz QPI read speed and 6 ns tV1 ensure sub-100 ms boot latency; 20-year retention guarantees field reliability across product lifecycle. | Use Scenario: Dedicated flash region for over-the-air (OTA) firmware patches in medical diagnostic equipment. IC Role / Device Role / Timing Role: Field-updatable code storage with atomic erase/program; isolated from main application code. Use Value: 4-kB block erase enables fine-grained patching without disrupting adjacent modules; 100K endurance supports frequent updates over 10+ years. |
| Configuration Data Retention | Secure Key Storage |
Use Scenario: Holding calibrated sensor offsets, network credentials, and user preferences in smart HVAC controllers. IC Role / Device Role / Timing Role: Persistent parameter store accessed during initialization and runtime; updated infrequently but reliably. Use Value: Hardware WP pin prevents accidental writes; deep power-down current (2 µA) extends battery life in backup-powered configurations. | Use Scenario: Storing AES encryption keys and device identity certificates in payment terminal secure elements. IC Role / Device Role / Timing Role: Tamper-resistant nonvolatile memory with write-locking and OTP integrity verification. Use Value: 4-kbit secured OTP register provides dedicated, one-time-writable space; SRP bits prevent reprogramming after provisioning. |
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, 1.7–2.0 V, supports DTR Quad I/O and octal DDR; no ACC pin; 133 MHz max QPI | Lacks hardware-programmable acceleration and 4-kbit secured OTP; offers higher max frequency but no ACC-assisted programming | Select when maximum read bandwidth is critical and OTP security is handled externally. |
| Macronix MX25L3233F | 32 Mbit, 2.7–3.6 V supply only; supports standard SPI/QPI; no SFDP or secured OTP; 104 MHz max | Requires level-shifting for 1.8 V hosts; lacks SFDP auto-discovery and hardware-secured key storage | Select only in legacy 3.3 V designs where voltage compatibility and cost outweigh advanced features. |
Compared with Winbond W25Q32JW and Macronix MX25L3233F, the AT25SL321-MBUE-T uniquely combines 1.7–2.0 V operation, SFDP register, 4-kbit secured OTP, and ACC-pin-accelerated programming - making it optimal for compact, secure, low-power embedded systems requiring field-upgradable firmware and trusted key storage.
Availability
AT25SL321-MBUE-T is available at Aetrix Electronics and suitable for industrial control systems, medical diagnostics equipment, and IoT edge gateways requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT25SL321-MBUE-T 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 delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT applications.
The AT25SL321 product line targets resource-constrained embedded systems needing high-reliability, low-voltage serial flash with advanced security and flexible erase architecture - specifically designed for firmware storage, OTA updates, and secure credential retention.
FAQ
What is the operating voltage range of the AT25SL321-MBUE-T?
The AT25SL321-MBUE-T operates from 1.7 V to 2.0 V, enabling direct integration with 1.8 V logic families without level shifters. This narrow supply range ensures stable internal charge pump operation and consistent timing across temperature, and is verified in Section 9.2 (Operating Ranges) of the DS-AT25SL321-112 Rev. K datasheet. The AT25SL321-MBUE-T does not support 2.5 V, 3.3 V, or 5 V supplies.
Does the AT25SL321-MBUE-T support Quad Peripheral Interface (QPI) mode?
Yes, the AT25SL321-MBUE-T supports QPI mode via the Enable QPI (38h) command, enabling 4-bit-wide command, address, and data transfers. In QPI mode, it achieves up to 104 MHz clock frequency and 532 MHz equivalent bandwidth using Fast Read Quad I/O (EBh) or Word Read Quad I/O (E7h). QPI operation is fully documented in Section 5.4 and Table 9 of the AT25SL321-MBUE-T datasheet.
How is hardware write protection implemented on the AT25SL321-MBUE-T?
The AT25SL321-MBUE-T implements hardware write protection through the WP pin combined with Status Register Protection bits (SRP0/SRP1). When WP is driven low and SRP[1:0] = 10b or 11b, all non-volatile registers and memory blocks become locked against program/erase commands. This dual-layer protection is detailed in Section 6.1 and Table 4 of the AT25SL321-MBUE-T datasheet.
What is the purpose of the ACC pin on the AT25SL321-MBUE-T?
The ACC pin on the AT25SL321-MBUE-T serves a dual function: as IO2 in standard operation and as a 9 V acceleration input during programming. Applying 9 V to ACC reduces typical page program time from 0.6 ms to ≤0.3 ms by boosting internal charge pump voltage. This feature is specified in Section 9.5 and Figure 66 of the AT25SL321-MBUE-T datasheet and requires external voltage generation circuitry.
Does the AT25SL321-MBUE-T include a Serial Flash Discoverable Parameters (SFDP) register?
Yes, the AT25SL321-MBUE-T includes a JEDEC-standard SFDP register accessible via the Read SFDP Register command (5Ah). It reports parameters including density, timing requirements, erase block map, and feature support - enabling host software to auto-configure drivers without hardcoded assumptions. SFDP layout and contents are defined in Tables 13–15 of the AT25SL321-MBUE-T datasheet.
AT25SL321-MBUE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 32Mbit
- Memory Organization:
- 4M x 8
- Memory Interface:
- SPI - Quad I/O
- Clock Frequency:
- 104 MHz
- Write Cycle Time - Word, Page:
- 150µs, 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.7V ~ 2V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-USON (3x4)
AT25SL321-MBUE-T FAQ
1.How can I place an order for AT25SL321-MBUE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SL321-MBUE-T 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 AT25SL321-MBUE-T reliable?
The price and inventory of AT25SL321-MBUE-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25SL321-MBUE-T is usually 5 days.
3.What payment methods are accepted for AT25SL321-MBUE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SL321-MBUE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SL321-MBUE-T?
AT25SL321-MBUE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SL321-MBUE-T 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 AT25SL321-MBUE-T?
For technical support, including AT25SL321-MBUE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SL321-MBUE-T requirements.
6.How does Aetrix verify that AT25SL321-MBUE-T is sourced from the original manufacturer or authorized distributors?
All AT25SL321-MBUE-T 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 AT25SL321-MBUE-T meets industry standards.
7.What is the process for return or replacement of AT25SL321-MBUE-T?
All AT25SL321-MBUE-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25SL321-MBUE-T, 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 AT25SL321-MBUE-T part is unused and in its original packaging.
Return procedure for AT25SL321-MBUE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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