My Inquiry
My Account
Renesas AT45DB321D-MU-2.5
- Part No.:
- AT45DB321D-MU-2.5
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-VDFN Exposed Pad
- Datasheet:
-
AT45DB321D-MU-2.5.pdf
- Description:
- IC FLASH 32MBIT SPI 50MHZ 8VDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,930
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT45DB321D-MU-2.5 from Microchip Technology (formerly Atmel) is a 32Mb serial DataFlash memory IC with SPI-compatible RapidS interface, 512/528-byte configurable page size, and dual 512/528-byte SRAM buffers. It operates from a single 2.5V supply, supports up to 66MHz clock frequency, and delivers 7mA typical active read current for embedded code shadowing and data logging applications.
For engineers reviewing the AT45DB321D-MU-2.5 datasheet, AT45DB321D-MU-2.5 pinout, AT45DB321D-MU-2.5 application, or AT45DB321D-MU-2.5 equivalent, key selection criteria include page-size configurability, continuous array read capability, hardware write protection via WP pin, sector lockdown security, and industrial temperature operation without high-voltage programming.
Technical Context
The AT45DB321D-MU-2.5 implements a sequential-access flash architecture with two independent 512/528-byte SRAM buffers enabling simultaneous data reception and flash reprogramming. Its RapidS interface supports SPI modes 0 and 3 at up to 66MHz, with three continuous read opcodes (03H, 0BH, E8H) optimized for different speed and dummy-byte requirements.
Memory organization comprises 8,192 pages across 64 sectors, supporting four erase granularities: page (512B), block (4KB), sector (64KB), and full chip (32Mb). All program/erase operations are self-timed, with RDY/BUSY pin signaling and internal power-on reset - eliminating external timing circuitry or voltage boosters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32Mb (34,603,008 bits), organized as 8,192 × 512/528-byte pages |
| Supply Voltage | 2.5V ±0.2V - enables direct integration with 2.5V logic systems without level shifting |
| Max Clock Frequency | 66MHz - supports high-throughput streaming in code shadowing and firmware update scenarios |
| Active Read Current | 7mA typical - minimizes power budget impact during sustained read operations |
| Data Retention | 20 years - ensures long-term reliability in industrial data logging and configuration storage |
| Endurance | 100,000 program/erase cycles per page - supports frequent field-updatable firmware or telemetry buffers |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems without derating |
Pinout & Package
AT45DB321D-MU-2.5 uses an 8-pin MLF (VDFN) package with exposed thermal pad (floating or GND-connected). Pin count reduction is achieved via serial interface - no address/data bus required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; falling edge initiates command, rising edge terminates self-timed operations |
| SCK | Serial Clock | Controls data transfer timing; SI latched on rising edge, SO driven on falling edge |
| SI | Serial Input | Carries all commands, addresses, and input data; MSB-first protocol |
| SO | Serial Output | Outputs read data and status; tri-stated when CS is high |
| WP | Write Protect | Hardware lock for protected sectors; overrides software protection when asserted low |
| RESET | Reset Input | Aborts ongoing operation and resets state machine; internally pulled high |
| RDY/BUSY | Open-drain Status | Pulled low during program/erase/page-to-buffer transfers; requires external pull-up |
| VCC / GND | Power Supply | Single 2.5V supply; GND reference for all I/O and core logic |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM buffers (512/528B each) | Enables pipelined operation: receive new data into one buffer while programming flash from the other |
| Configurable page size (512B or 528B) | Factory-set option allows alignment with legacy EEPROM emulation or optimized binary storage |
| Continuous array read (E8H/0BH/03H) | Eliminates address retransmission across page boundaries - critical for real-time audio/video streaming |
| Sector lockdown + 128B security register | Provides tamper-resistant storage for boot code, keys, or calibration data with individual sector control |
| No high-voltage programming | Full 2.5V operation eliminates charge pumps and external HV generators - simplifies PCB design |
| JEDEC-compliant ID read | Enables automated BOM verification and firmware compatibility checks via standard manufacturer/device ID bytes |
Applications
| Industrial Data Logger | Firmware Update Storage |
|---|---|
Use Scenario: Continuous acquisition of sensor readings (temperature, pressure, vibration) in remote monitoring nodes with limited power. IC Role / Device Role / Timing Role: Primary nonvolatile storage for time-stamped telemetry; leverages continuous array read for burst retrieval and low 7mA active current for battery longevity. Use Value: Dual buffers allow background logging while host processor processes prior batch - no data loss during flash programming latency. |
Use Scenario: Storing signed firmware images for secure over-the-air (OTA) updates in networked edge devices. IC Role / Device Role / Timing Role: Secure, field-upgradable code repository; uses sector lockdown to protect bootloader and 128B security register for signature validation keys. Use Value: 100K endurance and 20-year retention ensure reliable multi-generational firmware deployment without premature wear-out. |
| Embedded Code Shadowing | Audio Playback Buffer |
Use Scenario: Booting application code from flash into RAM on microcontrollers with limited internal memory. IC Role / Device Role / Timing Role: High-speed sequential code loader; exploits 66MHz RapidS interface and wrap-around continuous read to feed instruction fetches without stalls. Use Value: Page boundary transparency eliminates software overhead for address management - reduces boot time by >30% vs. random-access flash. |
Use Scenario: Local playback of preloaded voice prompts or alarm tones in medical or building automation panels. IC Role / Device Role / Timing Role: Low-latency audio stream source; uses E8H continuous read mode to sustain uninterrupted 48kHz/16-bit output without DMA intervention. Use Value: 25µA standby current extends idle battery life to years; deep power-down (15µA) enables instant wake-on-event without data loss. |
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; 1.8V–3.6V supply; no SRAM buffers; 133MHz QSPI vs. 66MHz SPI | Lacks dual-buffer pipelining and continuous-read optimization; better suited for XIP execution than streaming | Select for higher bandwidth with QSPI controllers; avoid when buffer-assisted streaming or EEPROM emulation is required |
| Macronix MX25L3233FZBI-12G | 32Mb standard SPI NOR flash; 2.3V–3.6V; no configurable page size; no sector lockdown or security register | Missing hardware write protection, security features, and flexible erase granularity - less suitable for secure firmware storage | Select for cost-sensitive industrial designs where security and advanced buffering are not required |
Compared with W25Q32JVSSIQ and MX25L3233FZBI-12G, the AT45DB321D-MU-2.5 uniquely combines dual-SRAM buffering, factory-configurable page size, and integrated sector-level security - making it optimal for streaming-critical and secure embedded firmware applications where SPI simplicity and deterministic latency matter more than raw throughput.
Availability
AT45DB321D-MU-2.5 is available at Aetrix Electronics and suitable for industrial data loggers, secure firmware update storage, and embedded code shadowing applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AT45DB321D-MU-2.5 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 the DataFlash product line, emphasizing robustness, low-power serial interfaces, and embedded system integration.
The AT45DB321D-MU-2.5 belongs to the Atmel DataFlash family, designed specifically for applications demanding sequential-access efficiency, hardware security, and seamless in-system reprogrammability without high-voltage circuitry.
FAQ
What is the operating voltage range for the AT45DB321D-MU-2.5?
The AT45DB321D-MU-2.5 operates from a single 2.5V ±0.2V supply, as confirmed by its "-MU-2.5" suffix and datasheet Section 1. This fixed 2.5V rating differs from broader-range variants like the AT45DB321D-SU (2.7V–3.6V). The device draws 7mA typical active current and 25µA standby current under this supply, enabling direct interfacing with 2.5V logic families without level shifters.
Does the AT45DB321D-MU-2.5 support SPI mode 0 and mode 3?
Yes, the AT45DB321D-MU-2.5 explicitly supports SPI modes 0 and 3 per its datasheet Features section and Section 4.1. Its RapidS interface uses rising-edge sampling on SI and falling-edge output on SO - matching mode 0 timing. Mode 3 compatibility is verified through identical clock polarity/inversion behavior under specified SCK conditions, enabling drop-in use with standard SPI controllers.
How does the dual-buffer architecture of the AT45DB321D-MU-2.5 improve system performance?
The AT45DB321D-MU-2.5 integrates two independent 512/528-byte SRAM buffers that operate concurrently with main memory programming. While one buffer accepts incoming data via SI, the other can be written to flash - eliminating dead time between data reception and storage. This pipelining reduces effective write latency by up to 50% in streaming applications such as real-time sensor logging or audio buffering.
Can the AT45DB321D-MU-2.5 be used for EEPROM emulation?
Yes, the AT45DB321D-MU-2.5 supports EEPROM emulation via a documented three-step read-modify-write sequence using its buffers. Unlike conventional flash, it allows byte- or bit-level alterations by loading a page into a buffer, modifying specific bytes, then writing back - all without external software overhead. This is validated in Section 1 Description and enables legacy EEPROM replacement in firmware parameter storage.
What security features does the AT45DB321D-MU-2.5 provide?
The AT45DB321D-MU-2.5 provides hardware-based security including individual sector write protection, sector lockdown (preventing further modification once set), and a 128-byte security register with 64-byte user-programmable space plus a unique 64-byte device identifier. These features are accessible via dedicated commands and function independently of the WP pin - ensuring tamper resistance for bootloader code and cryptographic keys.
AT45DB321D-MU-2.5 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:
- 528 Bytes x 8192 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 50 MHz
- Write Cycle Time - Word, Page:
- 6ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VDFN (6x5)
AT45DB321D-MU-2.5 FAQ
1.How can I place an order for AT45DB321D-MU-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321D-MU-2.5 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-MU-2.5 reliable?
The price and inventory of AT45DB321D-MU-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB321D-MU-2.5 is usually 5 days.
3.What payment methods are accepted for AT45DB321D-MU-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321D-MU-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321D-MU-2.5?
AT45DB321D-MU-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321D-MU-2.5 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-MU-2.5?
For technical support, including AT45DB321D-MU-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321D-MU-2.5 requirements.
6.How does Aetrix verify that AT45DB321D-MU-2.5 is sourced from the original manufacturer or authorized distributors?
All AT45DB321D-MU-2.5 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-MU-2.5 meets industry standards.
7.What is the process for return or replacement of AT45DB321D-MU-2.5?
All AT45DB321D-MU-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321D-MU-2.5, 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-MU-2.5 part is unused and in its original packaging.
Return procedure for AT45DB321D-MU-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB321D-MU-2.5 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…
