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Renesas AT45DB021D-MH-T
- Part No.:
- AT45DB021D-MH-T
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 8-UDFN Exposed Pad
- Datasheet:
-
AT45DB021D-MH-T.pdf
- Description:
- IC FLASH 2MBIT SPI 66MHZ 8UDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,700
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Product details
Overview
AT45DB021D-MH-T from Microchip Technology is a 2-Mbit serial DataFlash memory IC with RapidS™ SPI-compatible interface (up to 66 MHz), 1,024-page × 256/264-byte organization, single 2.7–3.6V supply, and integrated 256/264-byte SRAM buffer. It enables code shadowing, EEPROM emulation, and secure data storage in embedded systems requiring low-pin-count, low-power nonvolatile memory.
For engineers reviewing the AT45DB021D-MH-T datasheet, AT45DB021D-MH-T pinout, AT45DB021D-MH-T application, or AT45DB021D-MH-T equivalent, key selection criteria include page-size configurability (256 vs. 264 bytes), sector lockdown security, continuous array read capability, and industrial-temperature operation with 20-year data retention.
Technical Context
The AT45DB021D-MH-T implements a dual-level memory architecture: main Flash array (2,162,688 bits) organized into 8 sectors (including split Sector 0a/0b), and one dedicated SRAM buffer for temporary data staging. Page programming uses self-timed buffer-to-main-memory transfer with optional built-in erase (83H) or pre-erased write (88H).
Its RapidS serial interface supports SPI Modes 0 and 3, with three distinct read protocols: legacy E8H (66 MHz), high-frequency 0BH (66 MHz), and low-frequency 03H (33 MHz), all enabling seamless page-boundary crossing and array wraparound during continuous reads - critical for boot code streaming and firmware updates.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (2,162,688 bits), organized as 1,024 pages × 256 or 264 bytes |
| Interface Speed | Up to 66 MHz SCK for Continuous Array Read (0BH/E8H), 33 MHz for 03H mode |
| Supply Voltage | 2.7 V to 3.6 V single supply - eliminates need for charge pumps or dual rails |
| Power Consumption | 7 mA typical active read current; 25 μA standby; 15 μA deep power-down |
| Erase Granularity | Page (256 B), Block (2 KB), Sector (32 KB), or Chip (2 Mbit) - enables fine-grained firmware partitioning |
| Data Retention | 20 years at industrial temperature range (−40°C to +85°C) |
| Endurance | 100,000 program/erase cycles per page - suitable for logging and configuration storage |
Pinout & Package
AT45DB021D-MH-T is housed in an 8-pin SOIC package (3.9 mm × 4.9 mm, 1.27 mm pitch), RoHS-compliant and halide-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable; initiates command sequence on high-to-low transition; deassertion places device in standby (SO tri-stated) |
| SCK | Serial Clock | Controls data timing; SI latched on rising edge, SO driven on falling edge - supports SPI Modes 0/3 |
| SI | Serial Input | Accepts opcodes, addresses, and data; MSB-first protocol; no internal pull-up |
| SO | Serial Output | Drives read data and status bits; tri-stated when CS high; no internal pull-up |
| WP | Write Protect | Hardware lock: low state blocks program/erase on protected sectors regardless of software settings |
| RESET | Reset Input | Active-low aborts ongoing operation and resets internal state machine; internal POR circuit eliminates external reset IC need |
| VCC | Power Supply | 2.7–3.6 V supply; powers logic, Flash, and buffer; invalid voltage risks corruption |
| GND | Ground Reference | System ground return path; required for stable operation and noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| User-configurable page size | Factory-set 256-byte or field-selectable 264-byte pages - optimizes buffer alignment and wear leveling |
| Continuous Array Read | Seamless page-boundary and array-wraparound reads (E8H/0BH/03H) - eliminates CPU intervention for boot code streaming |
| Sector Lockdown & Security Register | 128-byte register with 64-byte user space + unique 64-byte device ID - enables secure firmware signing and anti-cloning |
| Flexible erase hierarchy | Page/Block/Sector/Chip erase options - supports incremental firmware updates without full reflash |
| EEPROM emulation support | Self-contained read-modify-write via SRAM buffer - enables byte-alterable storage without external controller logic |
Applications
| Boot Code Storage | Firmware Update Buffer |
|---|---|
Use Scenario: Storing primary bootloader and application firmware in embedded microcontrollers with limited external memory interfaces. IC Role / Device Role / Timing Role: Nonvolatile code storage with rapid sequential read access; serves as source for XIP or shadow-load into RAM. Use Value: Continuous Array Read (0BH) enables uninterrupted 66 MHz streaming - reduces boot time by eliminating address reinitialization at page boundaries. | Use Scenario: Holding validated firmware images prior to atomic update in industrial gateways and IoT edge nodes. IC Role / Device Role / Timing Role: Dual-role buffer: stores incoming image in SRAM, then programs verified pages into Flash with built-in erase (83H). Use Value: Sector lockdown prevents accidental overwrite of active firmware during update - ensures fail-safe rollback capability. |
| Secure Configuration Storage | Event Logging Memory |
Use Scenario: Storing calibrated sensor parameters, cryptographic keys, and device-specific credentials in medical and automotive ECUs. IC Role / Device Role / Timing Role: Secure nonvolatile storage with hardware (WP) and software (Sector Lockdown) protection layers. Use Value: 128-byte Security Register provides tamper-resistant key storage - 64-byte unique device ID enables secure provisioning and lifecycle traceability. | Use Scenario: Recording timestamped operational events (e.g., fault codes, sensor anomalies) in energy meters and PLCs. IC Role / Device Role / Timing Role: High-endurance, low-power logging medium supporting frequent small writes via page-level erase/program cycles. Use Value: 100,000 P/E cycles per page and 20-year retention ensure reliable decade-long logging without data loss or refresh overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| W25Q20EW | 2 Mbit Quad SPI (QSPI) interface; 133 MHz max clock; no SRAM buffer; standard SPI not RapidS | Lacks continuous read wraparound and EEPROM emulation; requires external logic for byte-alterable storage | Choose for QSPI host compatibility and higher throughput; avoid if RapidS timing or buffer-assisted read-modify-write is required. |
| MX25L2006E | 2 Mbit standard SPI; 80 MHz max clock; no configurable page size; no security register or device ID | No sector lockdown or hardware write protect pin; lacks dedicated SRAM buffer for seamless modify operations | Choose for cost-sensitive designs where security and EEPROM emulation are not required; verify absence of WP pin impact on system-level protection. |
Compared with W25Q20EW and MX25L2006E, the AT45DB021D-MH-T uniquely combines RapidS timing, on-chip SRAM buffer, factory-configurable page size, and integrated security features - making it optimal for secure, low-overhead firmware and configuration storage in resource-constrained embedded systems.
Availability
AT45DB021D-MH-T is available at Aetrix Electronics and suitable for boot code storage, firmware update buffering, secure configuration storage, and event logging applications requiring stable component supply, long-term lifecycle support, and industrial-temperature reliability.
Supply support for AT45DB021D-MH-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
Microchip Technology is a global semiconductor company specializing in microcontrollers, analog devices, Flash memory, and security solutions for embedded control applications.
The AT45DB021D-MH-T belongs to Microchip's DataFlash® family, designed specifically for high-reliability, low-pin-count serial Flash applications where sequential access, security, and EEPROM-like flexibility are essential - especially in industrial, medical, and automotive systems.
FAQ
What is the maximum clock frequency supported by AT45DB021D-MH-T for continuous array read operations?
The AT45DB021D-MH-T supports up to 66 MHz for Continuous Array Read using opcodes E8H (legacy) and 0BH (high-frequency mode), as specified by the fCAR1 parameter. The 03H (low-frequency) mode operates up to 33 MHz without dummy byte overhead. All modes maintain seamless page-boundary crossing and array wraparound, enabling uninterrupted streaming for boot code and firmware execution.
Does AT45DB021D-MH-T support both 256-byte and 264-byte page sizes, and how is this configured?
Yes, AT45DB021D-MH-T supports both 256-byte and 264-byte page sizes. The 256-byte "power-of-two" format is factory-preconfigured; the 264-byte DataFlash® standard format is enabled via internal configuration fuse. Addressing differs: 256-byte mode uses A17–A0 addressing, while 264-byte mode uses PA9–PA0 + BA8–BA0. Both formats coexist in the same device, with buffer and main memory sized accordingly (256 or 264 bytes each).
How does the SRAM buffer in AT45DB021D-MH-T enable EEPROM emulation?
The AT45DB021D-MH-T's 256/264-byte SRAM buffer enables EEPROM emulation through a self-contained three-step read-modify-write operation: (1) read target page into buffer, (2) modify desired bytes in buffer, (3) write buffer contents back to Flash with built-in erase (83H). This eliminates need for external RAM or complex wear-leveling firmware - a core design advantage over standard SPI Flash devices.
What hardware and software security features does AT45DB021D-MH-T provide?
AT45DB021D-MH-T provides dual-layer security: hardware via the active-low WP pin (blocks program/erase on protected sectors regardless of software state), and software via Sector Lockdown and a 128-byte Security Register containing 64-byte user-programmable space and a unique 64-byte device identifier. These features collectively prevent unauthorized firmware modification and enable secure device authentication and provisioning.
Is AT45DB021D-MH-T compatible with standard SPI controllers, and which modes does it support?
Yes, AT45DB021D-MH-T is fully compatible with standard SPI controllers and supports SPI Modes 0 and 3. Its RapidS™ interface maintains strict SPI electrical and protocol compliance while extending performance to 66 MHz. No special controller firmware or hardware is required - standard SPI master peripherals can drive CS, SCK, SI, and SO directly, with RESET and WP used optionally for enhanced control and protection.
AT45DB021D-MH-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-UDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 2Mbit
- Memory Organization:
- 264 Bytes x 1024 pages
- Memory Interface:
- SPI
- Clock Frequency:
- 66 MHz
- Write Cycle Time - Word, Page:
- 4ms
- 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-UDFN (5x6)
AT45DB021D-MH-T FAQ
1.How can I place an order for AT45DB021D-MH-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB021D-MH-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 AT45DB021D-MH-T reliable?
The price and inventory of AT45DB021D-MH-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB021D-MH-T is usually 5 days.
3.What payment methods are accepted for AT45DB021D-MH-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB021D-MH-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB021D-MH-T?
AT45DB021D-MH-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB021D-MH-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 AT45DB021D-MH-T?
For technical support, including AT45DB021D-MH-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB021D-MH-T requirements.
6.How does Aetrix verify that AT45DB021D-MH-T is sourced from the original manufacturer or authorized distributors?
All AT45DB021D-MH-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 AT45DB021D-MH-T meets industry standards.
7.What is the process for return or replacement of AT45DB021D-MH-T?
All AT45DB021D-MH-T units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB021D-MH-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 AT45DB021D-MH-T part is unused and in its original packaging.
Return procedure for AT45DB021D-MH-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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