My Inquiry
My Account
Renesas AT45DB321D-MWU-SL954
- Part No.:
- AT45DB321D-MWU-SL954
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
AT45DB321D-MWU-SL954.pdf
- Description:
- IC FLASH 32MBIT SPI 66MHZ 8VDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,659
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT45DB321D-MWU-SL954 from Microchip Technology (acquired Atmel) is a 32Mb serial DataFlash memory IC with SPI-compatible RapidS interface, 66MHz max clock, dual 512/528-byte SRAM buffers, and flexible page/block/sector/chip erase architecture. It operates from a single 2.5V–3.6V supply and supports code shadowing, firmware storage, and data logging in embedded systems.
For engineers reviewing the AT45DB321D-MWU-SL954 datasheet, AT45DB321D-MWU-SL954 pinout, AT45DB321D-MWU-SL954 application, or AT45DB321D-MWU-SL954 equivalent, key selection criteria include its 8,192-page × 512/528-byte organization, RDY/BUSY open-drain status signaling, hardware write protection (WP), reset control, and industrial temperature range (–40°C to +85°C).
Technical Context
The AT45DB321D-MWU-SL954 implements a sequential-access flash architecture with two independent 512/528-byte SRAM buffers enabling concurrent receive-and-program operation. Its RapidS interface supports SPI modes 0 and 3 at up to 66MHz, with continuous array read (E8H/0BH/03H opcodes) bypassing buffers for direct streaming.
Memory is organized into 64 sectors (including two 8-page sub-sectors), 1,024 blocks (8 pages each), and 8,192 programmable pages. Erase granularity spans page (512 B), block (4KB), sector (64KB), and full chip (32Mb), all self-timed with RDY/BUSY pin indication and no external high-voltage programming required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory density | 32Mb (34,603,008 bits) organized as 8,192 pages of 512 or 528 bytes |
| Interface speed | Up to 66MHz SCK for RapidS continuous read (0BH/E8H); 33MHz for legacy 03H mode |
| Supply voltage | Single 2.5V–3.6V or 2.7V–3.6V rail - eliminates need for charge pumps or dual supplies |
| Power consumption | 7mA typical active read current; 25µA standby; 15µA deep power-down current |
| Erase endurance | 100,000 program/erase cycles per page minimum - validated for long-term field deployment |
| Data retention | 20 years at 85°C - specified for industrial-temperature operation without refresh |
| Security features | 128-byte security register (64B user-programmable + 64B unique device ID) and sector lockdown |
Pinout & Package
AT45DB321D-MWU-SL954 is packaged in an 8-pin SOIC (Small Outline Integrated Circuit) with standard pinout and industrial-grade lead finish. The package is RoHS-compliant, halide-free, and Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; must transition low-to-high to complete self-timed operations (e.g., program/erase) |
| SCK | Serial Clock | Input clock for SPI timing; data latched on rising edge (SI), output shifted on falling edge (SO) |
| SI | Serial Input | Command, address, and data input path; MSB-first protocol with no internal buffering |
| SO | Serial Output | Open-drain compatible output; tri-stated when CS is high; supports shared-bus topology |
| WP | Write Protect | Hardware-level sector lock override; low-active; functions independently of software protection registers |
| RESET | Reset | Active-low asynchronous abort; terminates ongoing operation and returns state machine to idle |
| RDY/BUSY | Ready/Busy Status | Open-drain output indicating internal activity (program/erase/page transfer); requires external pull-up |
| VCC / GND | Power / Ground | Single 2.5–3.6V supply; GND serves as reference for all I/O and internal logic |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM buffers (512/528 B each) | Enables simultaneous data reception into one buffer while reprogramming flash from the other - critical for real-time firmware updates |
| Continuous array read (E8H/0BH/03H) | Eliminates address retransmission between pages; zero-latency wraparound across page boundaries supports seamless code shadowing |
| Flexible page size configuration | Factory-set 512-byte (power-of-two) or 528-byte (DataFlash-optimized) page format - simplifies alignment with ECC or file-system metadata |
| Hardware + software protection | WP pin provides fail-safe sector lock; combined with 128-byte security register for secure boot and IP protection |
| Industrial temperature range | Specified operation from –40°C to +85°C - qualified for automotive body electronics, industrial HMIs, and outdoor IoT gateways |
Applications
| Firmware Storage | Code Shadowing |
|---|---|
|
Use Scenario: Storing bootloader, application firmware, and configuration parameters in resource-constrained microcontroller-based devices. IC Role / Device Role / Timing Role: Nonvolatile storage element accessed via SPI during boot or over-the-air update; RDY/BUSY pin synchronizes host polling. Use Value: 100,000 erase cycles and 20-year data retention ensure field-upgradable firmware integrity across product lifetime. |
Use Scenario: Executing application code directly from external memory by copying pages into RAM or XIP-capable interfaces. IC Role / Device Role / Timing Role: High-speed sequential read source supporting E8H/0BH commands at up to 66MHz - minimizes copy latency and bus occupancy. Use Value: Continuous array read with automatic page-wrap eliminates CPU intervention during boundary crossing, improving deterministic execution timing. |
| Data Logging | Secure Configuration Storage |
|
Use Scenario: Recording sensor readings, event timestamps, or diagnostic logs in battery-powered edge nodes with limited power budget. IC Role / Device Role / Timing Role: Low-power nonvolatile memory with 15µA deep power-down mode and page-erase granularity for efficient wear leveling. Use Value: 7mA active read current and sector-lock capability allow selective write-protection of calibration data while permitting dynamic log updates. |
Use Scenario: Storing cryptographic keys, device certificates, and factory-calibrated parameters requiring tamper resistance. IC Role / Device Role / Timing Role: Security register with 64-byte unique device ID and sector lockdown used during secure boot and provisioning. Use Value: Hardware WP pin + software-controlled sector protection provide layered defense against unauthorized modification or cloning. |
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 QSPI clock; no RDY/BUSY pin | Better random read performance but lacks concurrent buffer operation; requires different driver stack | Choose for high-speed instruction fetch; avoid if continuous streaming or background programming is required |
| Macronix MX25L3233FZBI-10G | 32Mb standard SPI NOR flash; 104MHz max clock; no dual buffers; supports SFDP; no built-in security register | Lower cost, JEDEC-standard command set; lacks sector lockdown and unique device ID | Choose for cost-sensitive designs where security and concurrent operation are not critical |
Compared with W25Q32JVSSIQ and MX25L3233FZBI-10G, the AT45DB321D-MWU-SL954 uniquely delivers dual-buffered sequential access with hardware write protection and integrated security - making it optimal for firmware update pipelines and secure boot architectures where buffer concurrency and tamper resistance are design requirements.
Availability
AT45DB321D-MWU-SL954 is available at Aetrix Electronics and suitable for firmware storage, code shadowing, data logging, and secure configuration storage requiring stable component supply, long-lifecycle support, and industrial-temperature qualification.
Supply support for AT45DB321D-MWU-SL954 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 line, including documentation, validation, and long-term supply commitments.
The AT45DB321D-MWU-SL954 belongs to the Atmel DataFlash family - designed specifically for high-reliability, low-pin-count, sequential-access flash applications where SPI bandwidth, power efficiency, and embedded security are prioritized over random-address performance.
FAQ
What is the operating voltage range for the AT45DB321D-MWU-SL954?
The AT45DB321D-MWU-SL954 operates from a single supply of 2.5V to 3.6V (or 2.7V to 3.6V depending on revision). This eliminates the need for charge pumps or auxiliary voltage rails, simplifying power design in space-constrained embedded systems. All program, erase, and read operations are fully functional across this range, with specifications guaranteed at both extremes.
Does the AT45DB321D-MWU-SL954 support true SPI mode compatibility?
Yes, the AT45DB321D-MWU-SL954 supports SPI modes 0 and 3 per the RapidS interface specification. It uses standard CPOL/CPHA definitions: mode 0 (CPOL=0, CPHA=0) and mode 3 (CPOL=1, CPHA=1), with data sampled on the rising edge of SCK for input (SI) and output on the falling edge (SO). No proprietary protocol translation layer is required.
How does the dual-buffer architecture of the AT45DB321D-MWU-SL954 improve system throughput?
The AT45DB321D-MWU-SL954 integrates two independent 512/528-byte SRAM buffers that operate asynchronously from the main flash array. While one buffer streams incoming data via SI, the other can simultaneously program a previously loaded page into flash - eliminating pipeline stalls and enabling sustained data rates in logging or firmware update scenarios.
Can the AT45DB321D-MWU-SL954 be used for EEPROM emulation?
Yes, the AT45DB321D-MWU-SL954 supports EEPROM emulation through a self-contained three-step read-modify-write sequence using its SRAM buffers. This avoids external controllers or complex wear-leveling algorithms, allowing byte- or word-level updates within a page - ideal for parameter storage, counters, or configuration flags in microcontroller-based systems.
What is the purpose of the RDY/BUSY pin on the AT45DB321D-MWU-SL954?
The RDY/BUSY pin on the AT45DB321D-MWU-SL954 is an open-drain output that signals internal activity - pulled low during self-timed operations including page programming, block erasing, sector erasing, chip erasing, and buffer-to-array transfers. It enables interrupt-driven host synchronization without polling, reducing CPU overhead and improving deterministic timing in real-time applications.
AT45DB321D-MWU-SL954 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-VDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 32Mbit
- Memory Organization:
- 512 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-SL954 FAQ
1.How can I place an order for AT45DB321D-MWU-SL954 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321D-MWU-SL954 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-SL954 reliable?
The price and inventory of AT45DB321D-MWU-SL954 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-SL954 is usually 5 days.
3.What payment methods are accepted for AT45DB321D-MWU-SL954?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321D-MWU-SL954 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321D-MWU-SL954?
AT45DB321D-MWU-SL954 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321D-MWU-SL954 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-SL954?
For technical support, including AT45DB321D-MWU-SL954 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321D-MWU-SL954 requirements.
6.How does Aetrix verify that AT45DB321D-MWU-SL954 is sourced from the original manufacturer or authorized distributors?
All AT45DB321D-MWU-SL954 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-SL954 meets industry standards.
7.What is the process for return or replacement of AT45DB321D-MWU-SL954?
All AT45DB321D-MWU-SL954 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321D-MWU-SL954, 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-SL954 part is unused and in its original packaging.
Return procedure for AT45DB321D-MWU-SL954:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB321D-MWU-SL954 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…
