My Inquiry
My Account
Renesas AT45DB321D-MWU-SL383
- Part No.:
- AT45DB321D-MWU-SL383
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
AT45DB321D-MWU-SL383.pdf
- Description:
- IC FLASH 32MBIT SPI 66MHZ 8VDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,650
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT45DB321D-MWU-SL383 from Microchip Technology (formerly Atmel) is a 32Mb serial DataFlash memory IC with SPI-compatible RapidS interface, organized as 8,192 pages of 512/528 bytes each, featuring 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 supports continuous array read for code shadowing in embedded microcontroller systems.
For engineers reviewing the AT45DB321D-MWU-SL383 datasheet, AT45DB321D-MWU-SL383 pinout, AT45DB321D-MWU-SL383 application, or AT45DB321D-MWU-SL383 equivalent, key selection considerations include page size configurability (512 vs. 528 bytes), hardware write protection via WP pin, sector lockdown security, and buffer-assisted concurrent read-while-write operation.
Technical Context
The AT45DB321D-MWU-SL383 implements a sequential-access flash architecture with two independent SRAM buffers enabling simultaneous data reception and flash reprogramming. Its RapidS serial 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 includes hierarchical erase granularity: page (512 B), block (4KB), sector (64KB), and full chip (32Mb), all self-timed. The device integrates a 128-byte security register with 64-byte user-programmable space and unique 64-byte device ID, alongside JEDEC-compliant manufacturer/device ID read capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 32Mb (34,603,008 bits), organized as 8,192 pages × 512 or 528 bytes |
| Supply Voltage | 2.5V–3.6V or 2.7V–3.6V single supply - enables direct interfacing with 3.3V logic without level shifters |
| Max Clock Frequency | 66MHz for RapidS continuous read - supports high-speed code execution from external memory |
| Page Erase Endurance | 100,000 cycles minimum per page - ensures long-term reliability in firmware update applications |
| Data Retention | 20 years at 85°C - validated for industrial deployments with extended service life requirements |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade embedded control and telemetry systems |
| Active Read Current | 7mA typical - minimizes power budget impact during frequent code/data fetch operations |
Pinout & Package
AT45DB321D-MWU-SL383 is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with standard pin spacing and RoHS-compliant green finish. This surface-mount package supports automated assembly and offers mechanical robustness for industrial PCB environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; initiates command sequence on falling edge and terminates operation on rising edge |
| SCK | Serial Clock | Master-generated clock; latches SI data on rising edge and clocks SO data on falling edge |
| SI | Serial Input | Unidirectional command/address/data input path; accepts opcodes, addresses, and buffer writes |
| SO | Serial Output | Unidirectional output for read data, status, and ID responses; tri-stated when CS is high |
| WP | Write Protect | Hardware-level sector lock override; prevents program/erase when asserted low, independent of software protection |
| RESET | Reset | Active-low asynchronous abort; forces idle state and clears internal command pipeline |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output signaling active programming/erase/page-transfer; requires external pull-up |
| VCC / GND | Power Supply / Ground | Single 2.5–3.6V supply pair; decoupling capacitor placement critical for stable 66MHz operation |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers (512/528 B each) | Enables true concurrent read-while-write: host streams data into one buffer while flash array is being programmed from the other |
| User-Configurable Page Size | Factory-set 512-byte "power-of-two" mode simplifies address arithmetic and aligns with standard memory-mapped access patterns |
| Three-Tier Erase Granularity | Page (512 B), block (4KB), and sector (64KB) erase options allow precise wear leveling and partial firmware updates without full chip erase |
| 128-Byte Security Register | Contains 64-byte user-programmable space plus unique 64-byte device ID - supports secure boot authentication and device binding |
| Hardware Write Protection (WP pin) | Physically blocks sector-level program/erase regardless of software state - critical for protecting bootloader or calibration data |
Applications
| Firmware Storage | Code Shadowing |
|---|---|
Use Scenario: Storing field-upgradable firmware images for microcontrollers in industrial PLCs and motor drives. IC Role / Device Role / Timing Role: Nonvolatile storage for binary images; accessed via SPI during boot or OTA update sequences. Use Value: 100,000 erase cycles and 20-year retention ensure reliable multi-year firmware lifecycle management without premature wear-out. |
Use Scenario: Loading executable code from serial flash into RAM for execution on resource-constrained MCUs. IC Role / Device Role / Timing Role: High-throughput sequential data source supporting continuous array read at up to 66MHz. Use Value: Zero-latency page-boundary crossing and wraparound behavior eliminate stalls during linear code execution. |
| Data Logging | Secure Configuration Storage |
Use Scenario: Buffering sensor telemetry in environmental monitoring nodes with intermittent wireless upload. IC Role / Device Role / Timing Role: Dual-buffer architecture accepts streaming sensor data while background flash writes occur. Use Value: Concurrent buffer-to-flash programming avoids data loss during high-rate acquisition bursts. |
Use Scenario: Storing calibrated parameters, cryptographic keys, and device-specific credentials in medical or automotive ECUs. IC Role / Device Role / Timing Role: Sector lockdown and 128-byte security register provide hardware-enforced isolation. Use Value: WP pin + sector protection prevents unauthorized modification even if host MCU is compromised. |
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-line I/O, no SRAM buffers; 133MHz max clock (quad mode) | Lacks concurrent read-while-write; requires software-managed erase/write sequencing | Preferred where quad I/O bandwidth outweighs buffer concurrency needs |
| Macronix MX25L3233FZUI-12G | 32Mb standard SPI NOR flash; no configurable page size; 100MHz max clock; no security register | No hardware sector lockdown or unique device ID; limited security features | Selected for cost-sensitive designs requiring basic code storage without advanced protection |
Compared with W25Q32JVSSIQ and MX25L3233FZUI-12G, the AT45DB321D-MWU-SL383 uniquely delivers dual-buffered read-while-write, factory-configurable 512-byte pages, and integrated 128-byte security register - making it optimal for secure, real-time firmware and data logging where deterministic latency and tamper resistance are required.
Availability
AT45DB321D-MWU-SL383 is available at Aetrix Electronics and suitable for firmware storage, code shadowing, data logging, and secure configuration storage requiring stable component supply across industrial design cycles.
Supply support for AT45DB321D-MWU-SL383 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, delivering high-reliability serial flash solutions for industrial and automotive markets.
The AT45DB321D-MWU-SL383 belongs to the Atmel DataFlash® family, engineered specifically for sequential-access applications demanding low pin count, concurrent buffer operation, and hardware security - targeting embedded systems where SPI bandwidth, power efficiency, and data integrity are critical.
FAQ
What is the default page size configuration for AT45DB321D-MWU-SL383?
The AT45DB321D-MWU-SL383 is factory preconfigured for 512-byte pages, providing power-of-two alignment that simplifies address calculation and compatibility with standard memory-mapped bootloaders. While 528-byte mode is supported, it requires explicit configuration via status register and is not the shipped default for this variant.
Does AT45DB321D-MWU-SL383 support true read-while-write operation?
Yes, AT45DB321D-MWU-SL383 supports true concurrent operation using its two independent 512/528-byte SRAM buffers: one buffer can be loaded via SI while the other is being written to main memory, enabling uninterrupted data streaming without host-side buffering overhead - a core differentiator versus standard SPI NOR flash.
How does hardware write protection work on AT45DB321D-MWU-SL383?
When the WP pin is driven low, AT45DB321D-MWU-SL383 disables all program and erase commands for sectors marked in the sector protection register - even if software protection is disabled. This hardware lock operates independently and cannot be overridden by command sequences, ensuring bootloader or calibration data remains immutable under fault conditions.
What is the purpose of the RDY/BUSY pin on AT45DB321D-MWU-SL383?
The RDY/BUSY pin on AT45DB321D-MWU-SL383 is an open-drain output that goes low during internally self-timed operations - including page programming, sector erasing, and buffer-to-memory transfers. It allows the host to poll status without issuing commands, reducing SPI traffic and enabling deterministic timing control in real-time systems.
Is AT45DB321D-MWU-SL383 compatible with standard SPI controllers?
Yes, AT45DB321D-MWU-SL383 is fully compatible with standard SPI controllers operating in Mode 0 (CPOL = 0, CPHA = 0) and Mode 3 (CPOL = 1, CPHA = 1), supporting clock frequencies up to 66MHz. Its instruction set uses standard 8-bit opcodes and follows MSB-first transmission, requiring no proprietary driver stack.
AT45DB321D-MWU-SL383 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:
- 528 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-MWU-SL383 FAQ
1.How can I place an order for AT45DB321D-MWU-SL383 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321D-MWU-SL383 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-MWU-SL383 reliable?
The price and inventory of AT45DB321D-MWU-SL383 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB321D-MWU-SL383 is usually 5 days.
3.What payment methods are accepted for AT45DB321D-MWU-SL383?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321D-MWU-SL383 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321D-MWU-SL383?
AT45DB321D-MWU-SL383 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321D-MWU-SL383 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-MWU-SL383?
For technical support, including AT45DB321D-MWU-SL383 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321D-MWU-SL383 requirements.
6.How does Aetrix verify that AT45DB321D-MWU-SL383 is sourced from the original manufacturer or authorized distributors?
All AT45DB321D-MWU-SL383 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-MWU-SL383 meets industry standards.
7.What is the process for return or replacement of AT45DB321D-MWU-SL383?
All AT45DB321D-MWU-SL383 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321D-MWU-SL383, 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-MWU-SL383 part is unused and in its original packaging.
Return procedure for AT45DB321D-MWU-SL383:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB321D-MWU-SL383 Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
