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Microchip Technology AT45DB021B-CC
- Part No.:
- AT45DB021B-CC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 9-TBGA, CSPBGA
- Datasheet:
-
AT45DB021B-CC.pdf
- Description:
- IC FLASH 2MBIT SPI 20MHZ 9CBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
AT45DB021B-CC from Microchip Technology (formerly Atmel) is a 2.7V-only serial Flash memory IC with SPI interface, organized as 1024 pages × 264 bytes (2,162,688 bits), featuring dual 264-byte SRAM buffers, 20 MHz max clock frequency, and hardware page write protection. It enables code shadowing, firmware storage, and data logging in embedded systems with minimal pin count.
For engineers reviewing the AT45DB021B-CC datasheet, AT45DB021B-CC pinout, AT45DB021B-CC application, or AT45DB021B-CC equivalent, this page delivers verified electrical specs, buffer-assisted reprogramming capability, continuous array read timing, 5.0V-tolerant control pins, and industrial temperature support - all critical for boot memory, OTA update storage, and low-power sensor node design.
Technical Context
The AT45DB021B-CC implements a SPI-compatible serial interface supporting Mode 0 and Mode 3, eliminating parallel address/data buses and reducing PCB routing complexity. Its architecture separates main Flash memory (1024 pages) from two independent 264-byte SRAM buffers, enabling simultaneous data reception into one buffer while programming the other into nonvolatile memory.
It supports three-tier erase granularity - page (264 B), block (8 pages = 2,112 B), and sector - and integrates self-timed program/erase operations with no external high-voltage supply required. The RDY/BUSY open-drain output and status register bit 7 provide real-time operation completion feedback without polling overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2,162,688 bits (1024 × 264-byte pages) - provides compact, pin-efficient storage for firmware images up to ~264 KB. |
| Supply Voltage | 2.7V–3.6V single supply - eliminates level-shifting for 3.3V microcontroller interfaces and simplifies power design. |
| Max Clock Frequency | 20 MHz - enables fast sequential reads (e.g., code shadowing) and reduces transfer time for buffer-to-memory programming. |
| Active Read Current | 4 mA typical - supports battery-powered applications with predictable current draw during instruction fetch. |
| Standby Current | 2 µA typical - ensures ultra-low quiescent power during sleep modes in portable or energy-harvested devices. |
| Input Tolerance | 5.0V-tolerant SI, SCK, CS, RESET, WP - allows direct connection to legacy 5V logic without external translators. |
| Temperature Range | −40°C to +85°C - qualified for industrial-grade operation in automotive body control, industrial HMI, and outdoor IoT nodes. |
Pinout & Package
AT45DB021B-CC is available in 8-pin SOIC (Small Outline Integrated Circuit) package per Figure 2-2 of the datasheet. Pin functions are electrically defined and validated per Table 2-1 and Section 5.5.
| 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 | Input-only clock; data latched on rising edge (SI), output shifted on falling edge (SO); supports SPI Modes 0/3. |
| SI | Serial Input | Input-only data line for opcodes, addresses, and buffer writes; MSB-first protocol with no internal pull-up. |
| SO | Serial Output | Output-only data line for memory/buffer reads and status register; tri-stated when CS is high. |
| WP | Hardware Write Protect | Active-low pin disabling programming of first 256 pages; 5.0V-tolerant, requires external pull-up if unused. |
| RESET | Chip Reset | Active-low asynchronous reset; forces internal state machine to idle; 5.0V-tolerant with internal POR circuitry. |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output pulled low during self-timed operations (e.g., page program, block erase); requires 1 kΩ external pull-up. |
| VCC / GND | Power Supply | 2.7–3.6V core supply and ground; decoupling capacitor (0.1 µF) recommended near VCC pin. |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 264-byte buffers enable concurrent data streaming (e.g., receive new firmware into Buffer 2 while programming Buffer 1 to Flash). |
| Continuous Array Read | Single opcode (68H/E8H) + 24-bit address initiates wraparound sequential read across entire memory - ideal for XIP code shadowing without address management. |
| Page-Level Reprogramming | Single-cycle erase-and-program (83H/86H) eliminates separate erase step; full page (264 B) written in ≤20 ms (tEP), enabling rapid field updates. |
| Hardware Data Protection | WP pin physically blocks reprogramming of first 256 pages; prevents accidental corruption of bootloader or calibration data in production systems. |
| EEPROM Emulation Support | Self-contained Read-Modify-Write via buffer transfer + compare + program enables byte-level updates without external software wear leveling. |
Applications
| Boot Memory for MCU | Firmware Storage in IoT Gateways |
|---|---|
Use Scenario: Storing boot code for ARM Cortex-M or RISC-V microcontrollers requiring fast, reliable startup from external memory. IC Role / Device Role / Timing Role: Serial boot memory providing continuous array read at 20 MHz to feed instruction cache during cold start. Use Value: Eliminates need for parallel NOR Flash; reduces PCB layer count and EMI from wide buses while maintaining <50 µs page access latency. |
Use Scenario: Holding upgradable firmware images and configuration profiles in cellular/NB-IoT gateways deployed in remote infrastructure. IC Role / Device Role / Timing Role: Field-updatable nonvolatile storage with dual-buffer pipelining to accept new firmware over LTE while preserving active image. Use Value: Enables atomic OTA updates with zero downtime - new image loaded into buffer during runtime, then atomically programmed to Flash with built-in erase. |
| Data Logging in Industrial Sensors | Audio Buffering in Voice-Enabled Devices |
Use Scenario: Capturing timestamped sensor readings (temperature, pressure, vibration) in predictive maintenance edge nodes operating on intermittent power. IC Role / Device Role / Timing Role: Low-power data recorder using standby current of 2 µA and page-erase granularity to minimize write amplification. Use Value: Extends battery life >5 years in duty-cycled deployments; page-level erase avoids full-chip erases that degrade endurance in cyclic logging. |
Use Scenario: Storing voice prompts, wake-word models, or recorded audio clips in smart speakers and voice-controlled appliances. IC Role / Device Role / Timing Role: High-fidelity audio buffer supporting continuous read at 20 MHz to sustain 48 kHz/16-bit playback without stutter. Use Value: Continuous array read mode delivers uninterrupted streaming from Flash to DAC; 264-byte page size aligns with common audio packet boundaries. |
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 density, Quad SPI (QSPI) capable, 104 MHz max clock, no integrated SRAM buffers. | Lacks dual-buffer pipelining; requires host-managed buffering for concurrent read/write; better suited for high-speed code XIP than firmware update pipelines. | Select W25Q20EW only if QSPI bandwidth >20 MB/s is required and host MCU handles buffer management. |
| AT45DB021D | Pin-compatible successor with extended temperature range (−40°C to +105°C), same 2 Mbit density and buffer architecture. | Valid for automotive under-hood or high-ambient industrial environments where AT45DB021B-CC's 85°C limit is insufficient. | Choose AT45DB021D for new designs targeting extended thermal reliability; AT45DB021B-CC remains optimal for cost-sensitive commercial/industrial use. |
Compared with W25Q20EW, AT45DB021B-CC offers hardware-accelerated buffer-to-Flash programming and lower active current, but lacks QSPI speed; versus AT45DB021D, it trades 20°C thermal margin for lower unit cost and established qualification history.
Availability
AT45DB021B-CC is available at Aetrix Electronics and suitable for boot memory, firmware storage, data logging, and audio buffering applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for AT45DB021B-CC 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 product support, documentation, and manufacturing continuity for the DataFlash family.
The AT45DB021B-CC belongs to Microchip's legacy DataFlash® serial Flash product line, designed specifically for embedded systems needing SPI-based, buffer-enhanced nonvolatile storage with deterministic reprogrammability and low-voltage operation.
FAQ
What is the maximum clock frequency supported by the AT45DB021B-CC?
The AT45DB021B-CC supports a maximum serial clock (SCK) frequency of 20 MHz for all read, write, and command operations. This applies to both continuous array read and page-level transfers. Exceeding this frequency may result in timing violations and data corruption, as confirmed in the "AC Characteristics" section of the official datasheet (1937J–DFLSH–9/05). The AT45DB021B-CC maintains full functionality across its specified voltage (2.7–3.6 V) and temperature (−40°C to +85°C) ranges at this rate.
Does the AT45DB021B-CC require a high-voltage programming supply?
No, the AT45DB021B-CC operates entirely from a single 2.7V–3.6V supply for both read and program/erase operations. All internal high-voltage generation is handled on-die, eliminating the need for external charge pumps or 12V programming rails. This is explicitly stated in the device description: "To allow for simple in-system reprogrammability, the AT45DB021B does not require high input voltages for programming." The AT45DB021B-CC achieves full page programming and erasure using only its core VCC supply.
How does the dual-buffer architecture of the AT45DB021B-CC improve system performance?
The AT45DB021B-CC's two independent 264-byte SRAM buffers enable true pipelined operation: while one buffer is being written with incoming data (e.g., new firmware), the other can be simultaneously programmed into Flash memory. This eliminates idle time between data reception and nonvolatile storage, reducing total update latency by up to 50% compared to single-buffer alternatives. The AT45DB021B-CC leverages this in commands like "Main Memory Page Program through Buffer" (opcode 82H/85H) and "Auto Page Rewrite" (58H/59H).
Is the AT45DB021B-CC compatible with standard SPI protocols?
Yes, the AT45DB021B-CC is fully compatible with standard SPI interfaces and supports both Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1). It uses a standard 3-wire interface (CS, SCK, SI/SO) with MSB-first data framing and no mandatory dummy cycles. The AT45DB021B-CC also features 5.0V-tolerant SI, SCK, CS, RESET, and WP pins, allowing direct interfacing with 5V microcontrollers without level shifters - a key differentiator from many competing serial Flash devices.
What is the purpose of the RDY/BUSY pin on the AT45DB021B-CC?
The RDY/BUSY pin on the AT45DB021B-CC is an open-drain output that goes low during any self-timed internal operation - including page programming, block erasing, buffer transfers, and compares - and returns high when complete. It provides hardware handshaking to avoid polling the status register (bit 7), reducing CPU overhead and improving deterministic timing. The AT45DB021B-CC requires an external 1 kΩ pull-up resistor on this pin, as specified in Section 5.5 of the datasheet.
AT45DB021B-CC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 9-TBGA, CSPBGA
- Packaging:
- Tray
- 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:
- 20 MHz
- Write Cycle Time - Word, Page:
- 14ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-CBGA (5x5)
AT45DB021B-CC FAQ
1.How can I place an order for AT45DB021B-CC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB021B-CC 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 AT45DB021B-CC reliable?
The price and inventory of AT45DB021B-CC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB021B-CC is usually 5 days.
3.What payment methods are accepted for AT45DB021B-CC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB021B-CC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB021B-CC?
AT45DB021B-CC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB021B-CC 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 AT45DB021B-CC?
For technical support, including AT45DB021B-CC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB021B-CC requirements.
6.How does Aetrix verify that AT45DB021B-CC is sourced from the original manufacturer or authorized distributors?
All AT45DB021B-CC 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 AT45DB021B-CC meets industry standards.
7.What is the process for return or replacement of AT45DB021B-CC?
All AT45DB021B-CC units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB021B-CC, 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 AT45DB021B-CC part is unused and in its original packaging.
Return procedure for AT45DB021B-CC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB021B-CC Tags
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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