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Microchip Technology AT45DB321C-CI
- Part No.:
- AT45DB321C-CI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 24-TBGA, CSPBGA
- Datasheet:
-
AT45DB321C-CI.pdf
- Description:
- IC FLASH 32MBIT SPI 40MHZ 24CBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,238
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Product details
Overview
AT45DB321C-CI from Microchip Technology is a 32-Mbit SPI-compatible serial DataFlash memory IC with RapidS™ interface, organized as 8192 pages × 528 bytes, featuring dual 528-byte SRAM buffers, hardware/software sector protection, and 100,000 program/erase cycles per page - used in embedded code shadowing, firmware storage, and voice/image buffering.
For engineers reviewing the AT45DB321C-CI datasheet, AT45DB321C-CI pinout, AT45DB321C-CI application, or AT45DB321C-CI equivalent, key selection considerations include its 40 MHz max clock (SPI Modes 0/3), continuous array read capability, buffer-assisted concurrent write/read operation, and industrial temperature support (–40°C to +85°C).
Technical Context
The AT45DB321C-CI implements a serial flash architecture with two independent 528-byte SRAM buffers enabling simultaneous data reception and main memory reprogramming. Its memory is partitioned into 16 sectors (Sector 0a/b + Sectors 1–15), supporting page-erase (528 B), block-erase (4,224 B), and sector-level lock protection via nonvolatile register.
It uses a 4-wire SPI-compatible RapidS™ interface (CS, SCK, SI, SO) with RDY/BUSY and RESET pins for status monitoring and recovery. All erase/program operations are self-timed, with hardware write protect (WP) and software-controlled sector locking - no high-voltage programming required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (34,603,008 bits), organized as 8192 × 528-byte pages |
| Interface | RapidS™ serial (SPI Modes 0 & 3 compatible); 4-wire: CS, SCK, SI, SO |
| Max Clock Frequency | 40 MHz (33 MHz guaranteed for full SPI Mode 0/3 compliance) |
| Supply Voltage | 2.7 V to 3.6 V single supply - enables direct integration with 3.3 V logic systems |
| Active Read Current | 10 mA typical - supports low-power boot and streaming applications |
| Standby Current | 6 µA typical - suitable for battery-backed or always-on embedded systems |
| Data Retention | 20 years - ensures long-term firmware and configuration integrity |
| Endurance | 100,000 program/erase cycles per page - validated for frequent field updates |
Pinout & Package
AT45DB321C-CI is available in 28-pin SOIC (300 mil) package, RoHS-compliant and green (Pb/halide-free). Pin functions are defined per JEDEC-standard serial flash interface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for command/data transfer; must remain low during full instruction sequence |
| SCK | Serial Clock | Master-generated clock up to 40 MHz; controls timing of SI/SO data sampling |
| SI | Serial Input | Command opcode, address, and data input path (MSB-first, SPI Mode 0/3) |
| SO | Serial Output | Read data, status register, or device ID output; tristated on CS high |
| WP | Hardware Write Protect | Active-low pin that locks protected sectors against erase/program when asserted |
| RESET | Chip Reset | Active-low asynchronous reset; clears internal state but does not affect sector protection |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output reflecting internal operation status (low = busy, high = ready) |
| VCC / GND | Power Supply | Single 2.7–3.6 V supply; decoupling required per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Dual 528-byte SRAM buffers | Enables concurrent receive-and-program operation - eliminates host wait states during flash reprogramming |
| Continuous Array Read | Supports seamless code shadowing without address reinitialization across page boundaries |
| Page and Block Erase | Flexible granularity: 528 B (page) or 4,224 B (block) - optimizes update speed vs. wear leveling |
| Hardware + Software Sector Protection | Nonvolatile 16-byte register + WP pin control - allows selective lockdown of boot or config sectors |
| Security Register | 128-byte space including 64-byte unique device ID and 64-byte user-programmable area - supports secure boot and traceability |
| JEDEC ID Support | Standard manufacturer/device ID readout - enables automated detection and BOM validation |
Applications
| Embedded Firmware Storage | Audio/Video Buffering |
|---|---|
Use Scenario: Storing and updating bootloader, application firmware, and configuration parameters in microcontroller-based edge devices. IC Role / Device Role / Timing Role: Nonvolatile serial code storage with fast page access and sector-lock security for safe over-the-air updates. Use Value: Enables reliable field firmware upgrades without external high-voltage circuitry or complex erase management. | Use Scenario: Capturing and streaming compressed voice or image data in portable medical or IoT sensors. IC Role / Device Role / Timing Role: High-throughput sequential buffer for burst capture and playback using Continuous Array Read mode. Use Value: Eliminates host CPU overhead during streaming by allowing uninterrupted read-out across 8192-page memory space. |
| Industrial HMI Code Shadowing | Secure Device Identity Management |
Use Scenario: Loading executable GUI code from flash into RAM at startup in human-machine interface panels. IC Role / Device Role / Timing Role: Serial flash acting as boot-time code source with zero-wait-state shadowing via rapid sequential access. Use Value: Reduces boot time and simplifies PCB layout versus parallel NOR flash - only 4 signal lines required. | Use Scenario: Embedding tamper-resistant device identifiers and cryptographic keys in factory-programmed modules. IC Role / Device Role / Timing Role: Secure storage element providing unique 64-byte device ID plus 64-byte user-programmable space. Use Value: Supports secure provisioning and anti-cloning without requiring external secure elements or crypto accelerators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT45DB321D-CI | Successor revision with enhanced reliability, same pinout and command set; supports higher endurance and improved data retention | Identical use cases; recommended for new designs per Microchip documentation | Select AT45DB321D-CI for production ramp or long-lifecycle projects where extended qualification is required |
| W25Q32JVSSIQ | 32 Mbit Quad SPI flash; supports QPI/DTR modes, faster erase times, but lacks dual SRAM buffers and continuous array read | Better for high-speed random-access code execution; less suited for streaming or concurrent buffer operations | Choose W25Q32JVSSIQ when system requires quad I/O bandwidth or smaller erase blocks, but accept loss of DataFlash-specific features |
Compared with AT45DB321C-CI, AT45DB321D-CI offers verified longevity improvements while maintaining full compatibility, whereas W25Q32JVSSIQ trades buffer concurrency and streaming optimization for raw throughput and industry-standard Quad SPI adoption.
Availability
AT45DB321C-CI is available at Aetrix Electronics and suitable for embedded firmware storage, audio buffering, and industrial HMI code shadowing requiring stable component supply and long-term lifecycle support.
Supply support for AT45DB321C-CI 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 U.S.-based semiconductor company specializing in microcontrollers, analog, FPGA, and memory solutions for industrial, automotive, and communications markets.
The AT45DB321C-CI belongs to Microchip's DataFlash® family - designed specifically for systems needing high-density serial flash with integrated SRAM buffers and streaming-optimized read modes.
FAQ
What is the maximum operating frequency of the AT45DB321C-CI interface?
The AT45DB321C-CI supports a maximum clock frequency of 40 MHz for RapidS™ operation. For full SPI Mode 0 and Mode 3 compliance, it guarantees 33 MHz performance. This enables high-bandwidth data transfers while maintaining compatibility with standard SPI controllers found in most microcontrollers and SoCs.
Does the AT45DB321C-CI require high-voltage programming?
No, the AT45DB321C-CI operates entirely from a single 2.7–3.6 V supply for both read and program/erase operations. It does not require external high-voltage generators or charge pumps - simplifying power design and reducing bill-of-materials cost in embedded systems.
How does the dual-buffer architecture of the AT45DB321C-CI improve system performance?
The AT45DB321C-CI's two independent 528-byte SRAM buffers allow the host to load new data into one buffer while simultaneously reprogramming the flash array from the other. This overlap eliminates idle time during page writes, significantly improving effective throughput in streaming and firmware update scenarios.
Can the AT45DB321C-CI be used for secure device identification?
Yes, the AT45DB321C-CI includes a 128-byte security register with a factory-programmed 64-byte unique device identifier and 64-byte user-programmable space. This enables secure boot verification, device authentication, and traceability without adding external secure elements.
What temperature range is supported by the AT45DB321C-CI?
The AT45DB321C-CI-CI variant is rated for industrial temperature operation from –40°C to +85°C. This makes it suitable for deployment in harsh environments such as factory automation, outdoor telemetry, and transportation control systems where thermal stability is critical.
AT45DB321C-CI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 24-TBGA, CSPBGA
- Packaging:
- Tray
- 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:
- 40 MHz
- Write Cycle Time - Word, Page:
- 15ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-CBGA (6x8)
AT45DB321C-CI FAQ
1.How can I place an order for AT45DB321C-CI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321C-CI 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 AT45DB321C-CI reliable?
The price and inventory of AT45DB321C-CI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB321C-CI is usually 5 days.
3.What payment methods are accepted for AT45DB321C-CI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321C-CI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321C-CI?
AT45DB321C-CI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321C-CI 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 AT45DB321C-CI?
For technical support, including AT45DB321C-CI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321C-CI requirements.
6.How does Aetrix verify that AT45DB321C-CI is sourced from the original manufacturer or authorized distributors?
All AT45DB321C-CI 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 AT45DB321C-CI meets industry standards.
7.What is the process for return or replacement of AT45DB321C-CI?
All AT45DB321C-CI units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321C-CI, 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 AT45DB321C-CI part is unused and in its original packaging.
Return procedure for AT45DB321C-CI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB321C-CI Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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