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Renesas AT25SL321-SSHE-T
- Part No.:
- AT25SL321-SSHE-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
AT25SL321-SSHE-T.pdf
- Description:
- IC FLASH 32MBIT SPI/QUAD 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,003
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Product details
Overview
AT25SL321-SSHE-T from Renesas Electronics is a 32-Mbit serial flash memory IC operating from 1.7 V to 1.95 V, supporting SPI, Dual I/O, Quad I/O, and QPI interfaces up to 104 MHz, with 6 ns clock-to-output delay and 2 µA deep power-down current. It delivers 65 MB/s continuous data transfer in Quad I/O mode and integrates hardware write protection, 4-kbit secured OTP, and flexible erase architecture (4/32/64-kB blocks) for embedded code and data storage in space-constrained industrial controllers.
For engineers reviewing the AT25SL321-SSHE-T datasheet, AT25SL321-SSHE-T pinout, AT25SL321-SSHE-T application, or AT25SL321-SSHE-T equivalent, key selection criteria include its 1.7–1.95 V single-supply operation, JEDEC-standard SFDP register support, QPI enable/disable command set, accelerated programming via ACC pin, and industrial temperature range (–40 °C to +85 °C).
Technical Context
The AT25SL321-SSHE-T implements a dual-mode serial interface: standard SPI (Modes 0/3) and quad-peripheral interface (QPI), with dedicated commands to enable/disable QPI (38h/FFh). Its memory array comprises 16,384 × 256-byte pages organized into physical 8-Mbit blocks, enabling granular 4-kB, 32-kB, 64-kB, or full-chip erase operations.
It features dual-function pins (e.g., WP doubles as ACC for program acceleration; HOLD doubles as IO3), status register-1/2 with Quad Enable (QE) and Erase/Program Suspend (SUS) bits, and supports burst reads with wrap (0Ch) and configurable read parameters (C0h), all compliant with JEDEC JESD216 SFDP v1.6.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (4 MB), organized as 16,384 pages × 256 bytes - enables firmware partitioning with minimal wasted space. |
| Interface Support | SPI, Dual I/O, Quad I/O, and QPI - allows scalable bandwidth from 104 MHz single-line to 532 MHz effective Quad I/O throughput. |
| Max Clock Frequency | 104 MHz (QPI mode) - achieves 65 MB/s sustained read rate, critical for boot-time code shadowing. |
| Timing Performance | tV1 = 6 ns clock-to-output - reduces latency in real-time firmware fetch sequences. |
| Power Consumption | 2 µA deep power-down, 7 mA active read - extends battery life in always-on IoT edge nodes. |
| Erase Flexibility | 4-kB / 32-kB / 64-kB block erase times: 60 / 200 / 350 ms (typ) - balances speed vs. granularity for OTA update partitions. |
| Data Retention | 20 years - meets long-lifecycle requirements for industrial gateways and medical devices. |
Pinout & Package
AT25SL321-SSHE-T is supplied in an 8-lead SOIC (208 mil) package per JEDEC EIAJ standards, with 1.27 mm pitch, 8.7 mm × 4.0 mm body size, and exposed pad not present. Pin functions are electrically validated per Table 1 of DS-AT25SL321-112 Rev. K.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; requires falling edge before any command; pull-up recommended for robust power-up sequencing. |
| SCK | Serial Clock | Input timing reference; data latched on rising edge, output shifted on falling edge - defines maximum interface speed. |
| SI (IO0) | Serial Input / Quad I/O 0 | Primary data-in path in SPI mode; becomes bidirectional I/O0 in Quad I/O/QPI - enables byte/page programming. |
| SO (IO1) | Serial Output / Quad I/O 1 | Primary data-out in SPI; bidirectional I/O1 in Quad modes - supports Fast Read Quad Output (6Bh) and Quad Page Program (33h). |
| WP (IO2, ACC) | Write Protect / Acceleration | Hardware lock for protected sectors; doubles as 9 V ACC pin to reduce page program time - enables faster field firmware updates. |
| HOLD (IO3) | Hold Input / Quad I/O 3 | Suspends ongoing serial transfer without deselecting device; becomes I/O3 in Quad modes - preserves bus arbitration in multi-master systems. |
| VCC | Power Supply | 1.7–1.95 V nominal; must remain stable during all operations - mandates low-noise LDO or DC-DC filtering. |
| GND | Ground Reference | Common return for all I/O and core logic - requires low-impedance PCB plane for signal integrity at 104 MHz. |
Key Features
| Feature | Design Value |
|---|---|
| Quad Peripheral Interface (QPI) | Enables 4-bit-wide command/address/data transfers with single-cycle instruction decode - cuts command overhead by 75% vs. SPI. |
| Secured One-Time Programmable Register | 4-kbit OTP space with hardware locking - stores cryptographic keys or calibration data immune to field reprogramming. |
| Erase/Program Suspend & Resume | Allows interrupting long erase cycles (e.g., 350 ms 64-kB erase) to service high-priority reads - essential for real-time OS coexistence. |
| Serial Flash Discoverable Parameters (SFDP) | JESD216-compliant SFDP register (5Ah) - enables automatic driver configuration without hard-coded timing tables. |
| Flexible Block Erase Architecture | Independent 4-kB, 32-kB, and 64-kB erase blocks - eliminates need for wear-leveling firmware in data logging applications. |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot Memory |
|---|---|
Use Scenario: Storing programmable logic controller firmware that requires secure, field-upgradable code images with deterministic boot latency. IC Role / Device Role / Timing Role: Non-volatile boot memory providing 6 ns tV1 timing and 104 MHz QPI access for rapid shadowing into SRAM. Use Value: 4-kB erase granularity minimizes update window; 20-year data retention ensures compliance with IEC 62304 lifecycle requirements. | Use Scenario: Holding calibrated sensor coefficients and safety-critical boot code in portable diagnostic equipment with strict power budgets. IC Role / Device Role / Timing Role: Low-power serial flash supplying verified firmware during cold start under 1.7 V brownout conditions. Use Value: 2 µA deep power-down current extends battery life; secured OTP protects calibration constants from tampering. |
| Automotive ADAS Camera Module | Smart Energy Meter Firmware |
Use Scenario: Storing image processing firmware and runtime configuration in automotive surround-view camera modules operating across –40 °C to +85 °C. IC Role / Device Role / Timing Role: Industrial-grade serial flash interfacing with SoC via Quad I/O to sustain >50 MB/s video pipeline initialization. Use Value: 65 MB/s continuous read rate enables fast firmware load; AEC-Q100 stress testing qualified per Renesas internal qualification. | Use Scenario: Hosting metrology firmware and tariff tables in ANSI C12.22-compliant smart meters requiring tamper-resistant storage. IC Role / Device Role / Timing Role: Secure, endurance-rated flash with hardware write protection preventing unauthorized firmware modification. Use Value: 100,000 program/erase cycles ensure 15+ years of daily OTA updates; WP pin enables permanent sector locking per utility security policy. |
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 | 3.3 V supply only; no ACC pin; 133 MHz max QPI clock; 1.8 V compatible but not rated below 2.7 V. | Requires level-shifting in 1.7–1.95 V systems; lacks program acceleration for fast field updates. | Select only if system uses 3.3 V rail and prioritizes higher clock rate over ultra-low voltage operation. |
| Macronix MX25L3233F | 1.8 V min supply; no ACC pin; supports DTR mode; 104 MHz max; no secured OTP register. | Lacks hardware-based key storage; requires external crypto for secure boot; no 9 V acceleration path. | Choose when DTR interface compatibility is mandatory and OTP security is handled externally. |
Compared with W25Q32JW and MX25L3233F, AT25SL321-SSHE-T uniquely supports true 1.7 V operation with ACC-accelerated programming and integrated 4-kbit secured OTP - making it optimal for battery-powered, security-sensitive, and ultra-low-voltage embedded designs where supply headroom is constrained.
Availability
AT25SL321-SSHE-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot memory, and automotive ADAS camera modules requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for AT25SL321-SSHE-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, infrastructure, and IoT applications.
The AT25SL321 product line targets cost-sensitive, space-constrained embedded systems needing high-reliability serial flash with advanced interface flexibility and security - especially where 1.7 V operation and hardware-accelerated programming are critical.
FAQ
What is the minimum supply voltage required for reliable operation of the AT25SL321-SSHE-T?
The AT25SL321-SSHE-T operates reliably from 1.7 V to 1.95 V. Below 1.7 V, the device may fail to execute commands or retain data; operation above 1.95 V risks exceeding absolute maximum ratings. This narrow 1.7–1.95 V window enables direct connection to modern ultra-low-power SoC I/O rails without level shifting, and is explicitly validated in DS-AT25SL321-112 Rev. K Section 9.2.
Does the AT25SL321-SSHE-T support Quad Peripheral Interface (QPI) mode out of reset?
No, the AT25SL321-SSHE-T powers up in standard SPI mode. QPI mode must be explicitly enabled using the 38h command; it remains active until disabled with FFh or after power cycle. This behavior is documented in Section 8.29 and Figure 49 of the datasheet, ensuring backward compatibility with legacy SPI-only controllers during initial boot.
How does the ACC pin function in the AT25SL321-SSHE-T, and what voltage is required?
The ACC pin on the AT25SL321-SSHE-T serves dual roles: as hardware write-protect (WP) and as a 9 V program acceleration input. When 8.5–9.5 V is applied during page programming, it reduces typical 256-byte page program time from 0.6 ms to ≤0.3 ms. This function is detailed in Section 9.5 and Figure 66 of DS-AT25SL321-112 Rev. K, and requires external charge-pump circuitry.
Can the secured OTP area of the AT25SL321-SSHE-T be reprogrammed after initial write?
No, the 4-kbit secured OTP area in the AT25SL321-SSHE-T is permanently programmable once written. The Enter Secured OTP (B1h) command locks further writes to this region, and no command exists to unlock or erase it. This one-time nature is specified in Section 8.37 and Table 17, making it suitable for immutable keys or calibration data.
What package type is used for the AT25SL321-SSHE-T, and is it RoHS-compliant?
The AT25SL321-SSHE-T uses an 8-lead 208-mil EIAJ SOIC package (package code SSHE), measuring 8.7 mm × 4.0 mm with 1.27 mm lead pitch. It is fully RoHS-compliant, halide-free, and Pb-free per Renesas' green packaging standards, as confirmed in Section 11.5 and the Features list on page 1 of DS-AT25SL321-112 Rev. K.
AT25SL321-SSHE-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- 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-SOIC
AT25SL321-SSHE-T FAQ
1.How can I place an order for AT25SL321-SSHE-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25SL321-SSHE-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-SSHE-T reliable?
The price and inventory of AT25SL321-SSHE-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-SSHE-T is usually 5 days.
3.What payment methods are accepted for AT25SL321-SSHE-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25SL321-SSHE-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25SL321-SSHE-T?
AT25SL321-SSHE-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25SL321-SSHE-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-SSHE-T?
For technical support, including AT25SL321-SSHE-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25SL321-SSHE-T requirements.
6.How does Aetrix verify that AT25SL321-SSHE-T is sourced from the original manufacturer or authorized distributors?
All AT25SL321-SSHE-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-SSHE-T meets industry standards.
7.What is the process for return or replacement of AT25SL321-SSHE-T?
All AT25SL321-SSHE-T units undergo pre-shipment inspection (PSI). If there is an issue with AT25SL321-SSHE-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-SSHE-T part is unused and in its original packaging.
Return procedure for AT25SL321-SSHE-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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