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Microchip Technology AT45DB321-TC
- Part No.:
- AT45DB321-TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT45DB321-TC.pdf
- Description:
- IC FLASH 32MBIT SPI 13MHZ 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,178
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Product details
Overview
AT45DB321-TC from Microchip Technology is a 32-Mbit serial DataFlash memory IC operating from a single 2.7V–3.6V supply, organized as 8192 pages × 528 bytes, featuring dual 528-byte SRAM buffers and SPI-compatible interface (Modes 0/3) for in-system reprogramming in embedded data logging and firmware storage applications.
For engineers reviewing the AT45DB321-TC datasheet, AT45DB321-TC pinout, AT45DB321-TC application, or AT45DB321-TC equivalent, this page delivers verified specifications, validated TSOP-28 and CBGA-48 package mappings, confirmed SPI timing (13 MHz max), buffer-assisted page programming (7 ms typical), and hardware write protection via WP pin - all critical for industrial-grade nonvolatile memory selection.
Technical Context
The AT45DB321-TC implements a serial Flash architecture with two independent 528-byte SRAM buffers enabling concurrent data reception and nonvolatile memory reprogramming. Its memory array is segmented into 8192 pages (528 B/page), supporting page-level, block-level (8 pages), and sector-level erase granularity.
It uses a standard 3-wire SPI interface (CS, SCK, SI/SO) with Mode 0 and Mode 3 compatibility, internal self-timed program/erase cycles (no external high-voltage programming required), and hardware page write protection via dedicated WP pin - all managed through 8-bit opcodes and 24-bit address fields per instruction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (34,603,008 bits), organized as 8192 × 528-byte pages |
| Supply Voltage | 2.7V to 3.6V single supply - enables direct integration with 3.3V logic systems without level shifting |
| Max Clock Frequency | 13 MHz - supports high-throughput serial data transfer up to ~1.6 MB/s effective read rate |
| Page Program Time | 7 ms typical - enables rapid field firmware updates with minimal system stall time |
| Page-to-Buffer Transfer | 120 µs typical - allows fast preload of next page while current page is being programmed |
| Standby Current | 3 µA typical - supports ultra-low-power operation in battery-backed or energy-constrained devices |
| Active Read Current | 4 mA typical at 13 MHz - balances speed and power efficiency for continuous streaming reads |
Pinout & Package
AT45DB321-TC is available in two RoHS-compliant packages: 28-pin TSOP-I (Type 1, 12.0 × 8.0 mm) and 48-ball CBGA (8.0 × 6.0 mm). Both packages support identical pin functions and electrical behavior.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable for SPI command initiation; must remain low during full instruction sequence |
| SCK | Serial Clock | Master-generated clock synchronizing all SI/SO data transfers; supports Modes 0 and 3 polarity/idle states |
| SI | Serial Input | Input for opcodes, addresses, and buffer data; MSB-first, sampled on SCK rising/falling edge per mode |
| SO | Serial Output | Tri-state open-drain output for read data and status register; requires external pull-up resistor |
| WP | Hardware Write Protect | Low-active pin blocking reprogramming of first 256 pages; internally pulled high - optional external tie-high |
| RESET | Chip Reset | Active-low asynchronous reset of internal state machine; internally pulled high - optional external tie-high |
| RDY/BUSY | Ready/Busy Indicator | Open-drain output driven low during self-timed operations (program/erase/transfer); used for polling or interrupt-driven control |
| VCC / GND | Power Supply | Single 2.7–3.6V supply with decoupling recommended; GND provides reference for all I/O and internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 528-byte buffers enable pipelined operation: receive new data into one buffer while programming the other into Flash |
| Single-Cycle Reprogram | Integrated erase-and-program in one command (e.g., opcode 83H/86H) eliminates separate erase step - reduces firmware update latency |
| Hardware Page Protection | WP pin physically disables programming of first 256 pages (132 KB), safeguarding boot code or calibration data without software overhead |
| Flexible Erase Granularity | Supports page-erase (1×528 B), block-erase (8×528 B = 4.2 KB), and sector-level management - optimizes wear leveling and partial updates |
| CMOS/TTL Compatibility | All inputs accept 0.6V/2.0V logic thresholds; outputs drive 1.6 mA low / -100 µA high - interoperable with mixed-voltage microcontrollers |
Applications
| Industrial Data Logger | Firmware Storage for MCU |
|---|---|
Use Scenario: Continuous sensor data capture (temperature, pressure, voltage) at 100 Hz over 72-hour cycles in remote monitoring nodes. IC Role / Device Role / Timing Role: Nonvolatile storage controller managing cyclic page writes, buffer-swapped buffering, and wear-leveling-aware block erases. Use Value: Dual-buffer architecture enables uninterrupted logging during background Flash programming; 3 µA standby current extends battery life beyond 5 years. |
Use Scenario: Storing and updating application firmware images (up to 320 KB) in field-deployed IoT gateways with secure OTA capability. IC Role / Device Role / Timing Role: SPI-connected firmware repository supporting atomic page rewrites and hardware-protected bootloader region. Use Value: WP pin locks first 256 pages containing bootloader; 7 ms page program time enables sub-second firmware patching without system downtime. |
| Digital Voice Recorder | Medical Device Configuration Store |
Use Scenario: Portable voice recorder capturing 8-bit PCM audio at 8 kHz, requiring seamless record/playback overlap and low-noise operation. IC Role / Device Role / Timing Role: Serial memory interface handling real-time audio streaming via buffer-to-Flash page transfers synchronized to audio sample clock. Use Value: 120 µs page-to-buffer transfer allows immediate buffer reload after playback start; 13 MHz SPI clock ensures zero-audio-gap streaming. |
Use Scenario: Storing calibrated sensor offsets, patient-specific therapy parameters, and audit logs in Class II medical infusion pumps. IC Role / Device Role / Timing Role: Tamper-resistant configuration store with hardware write lock and deterministic erase/program timing for FDA-compliant traceability. Use Value: RDY/BUSY pin enables deterministic interrupt-driven status polling; 10 ms page erase time guarantees bounded configuration save latency (< 15 ms worst-case). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar serial Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT45DB321B-TC | Successor revision with enhanced reliability, extended temperature range (-40°C to +85°C industrial grade), and updated AC timing specs (e.g., tEP reduced to 15 ms max) | Preferred for new designs requiring long-term supply stability and broader thermal margin; pin- and software-compatible drop-in replacement | Select AT45DB321B-TC for all new designs per manufacturer recommendation; legacy AT45DB321-TC remains valid for existing production continuity. |
| W25Q32JVSSIQ | 32 Mbit Quad SPI NOR Flash (Winbond); supports QSPI x4 mode (40 MB/s), no integrated SRAM buffers, no hardware WP pin, different command set | Better suited for XIP execution and high-speed code shadowing; lacks buffer-assisted streaming - requires host-side buffering logic | Choose W25Q32JVSSIQ only when higher throughput or QSPI interface is mandatory; AT45DB321-TC retains advantage for streaming data acquisition with minimal host CPU load. |
Compared with AT45DB321B-TC, the AT45DB321-TC offers identical pinout and instruction set but lacks updated endurance specs and extended temperature validation; versus W25Q32JVSSIQ, it trades raw bandwidth for built-in dual-buffer concurrency and hardware page protection - making it superior for deterministic embedded data logging where host resource minimization is critical.
Availability
AT45DB321-TC is available at Aetrix Electronics and suitable for industrial data loggers, medical device configuration storage, digital voice recorders, and MCU firmware repositories requiring stable component supply across extended product lifecycles.
Supply support for AT45DB321-TC 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, and nonvolatile memory solutions, with emphasis on reliability, longevity, and industrial-grade qualification.
The AT45DB321-TC belongs to Microchip's DataFlash family - designed specifically for embedded systems requiring high-density serial Flash with integrated SRAM buffers to eliminate host-side data staging and simplify firmware/data update architectures.
FAQ
What is the maximum SPI clock frequency supported by the AT45DB321-TC?
The AT45DB321-TC supports a maximum SCK frequency of 13 MHz under standard operating conditions (VCC = 2.7V–3.6V, TA = 0°C to +70°C). This timing is validated across both SPI Mode 0 and Mode 3 configurations, and all AC parameters - including tSU (10 ns), tH (20 ns), and tV (30 ns) - are guaranteed at this rate per the official Microchip datasheet Rev. 1121E.
Does the AT45DB321-TC require a high-voltage programming signal?
No, the AT45DB321-TC does not require high-voltage programming. It operates entirely from its single 2.7V–3.6V VCC supply for both read and program/erase operations. All internal erase and programming cycles are self-timed and powered solely by VCC - eliminating need for charge pumps, external HV generators, or complex power sequencing.
How does the hardware write protect (WP) pin function on the AT45DB321-TC?
When the WP pin is driven low, the AT45DB321-TC prevents reprogramming of the first 256 pages (pages 0–255, totaling 132 KB) of main memory. This protection applies to all program and erase commands targeting those pages. The WP pin is internally pulled high, so leaving it unconnected enables full memory access; external tie-high is recommended if protection is unused.
Can the AT45DB321-TC be used in place of standard SPI NOR Flash devices?
The AT45DB321-TC is functionally compatible with SPI NOR Flash in basic read/write use cases but differs critically in architecture: it uses page-based addressing (528-byte pages), includes dual SRAM buffers, and relies on opcode-driven commands (e.g., 52H for page read, 83H for buffer-to-page program). Direct substitution requires firmware adaptation - especially for erase granularity, buffer management, and status register interpretation.
What package options are available for the AT45DB321-TC?
The AT45DB321-TC is offered in two standard packages: 28-pin TSOP-I (Type 1, 12.0 × 8.0 mm body, 0.55 mm pitch) and 48-ball CBGA (8.0 × 6.0 mm body, 0.8 mm ball pitch). Both variants share identical pin functions, timing, and DC characteristics; the CBGA version provides improved thermal performance and board space efficiency for compact designs.
AT45DB321-TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- 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:
- 13 MHz
- Write Cycle Time - Word, Page:
- 15ms
- Access Time:
- -
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT45DB321-TC FAQ
1.How can I place an order for AT45DB321-TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321-TC 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 AT45DB321-TC reliable?
The price and inventory of AT45DB321-TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB321-TC is usually 5 days.
3.What payment methods are accepted for AT45DB321-TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321-TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321-TC?
AT45DB321-TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321-TC 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 AT45DB321-TC?
For technical support, including AT45DB321-TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321-TC requirements.
6.How does Aetrix verify that AT45DB321-TC is sourced from the original manufacturer or authorized distributors?
All AT45DB321-TC 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 AT45DB321-TC meets industry standards.
7.What is the process for return or replacement of AT45DB321-TC?
All AT45DB321-TC units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321-TC, 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 AT45DB321-TC part is unused and in its original packaging.
Return procedure for AT45DB321-TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB321-TC Tags
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