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Microchip Technology AT45DB321-TI
- Part No.:
- AT45DB321-TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT45DB321-TI.pdf
- Description:
- IC FLASH 32MBIT SPI 13MHZ 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,021
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Product details
Overview
AT45DB321-TI from Microchip Technology (formerly Atmel) is a 32-megabit, 2.7V-only serial DataFlash memory IC used for in-system reprogrammable nonvolatile storage in embedded systems. It features 8192 pages × 528 bytes/page, dual 528-byte SRAM buffers, SPI-compatible interface (Modes 0 and 3), 13 MHz max clock, and hardware page write protection - enabling concurrent data buffering and flash programming in voice, image, and firmware storage applications.
For engineers reviewing the AT45DB321-TI datasheet, AT45DB321-TI pinout, AT45DB321-TI application, or AT45DB321-TI equivalent, this page delivers verified technical context, validated pin functions, real-world use cases, and confirmed alternative parts - all grounded in the official AT45DB321 revision 1121E datasheet and Microchip product documentation.
Technical Context
The AT45DB321-TI implements a serial-interface Flash architecture with two independent 528-byte SRAM buffers that enable simultaneous data reception (into one buffer) while reprogramming flash pages (from the other). Its memory array is organized into 8192 pages of 528 bytes each (34,603,008 bits total), supporting page, block (8 pages), and sector-level erase granularity.
It uses a standard 3-wire SPI interface (CS, SCK, SI/SO) with Mode 0/3 compatibility, internal self-timed program/erase operations, and status register polling via RDY/BUSY pin or bit-7 readout. Hardware write protection (WP pin) locks the first 256 pages, and RESET provides synchronous state-machine reset without external power sequencing constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (8192 × 528-byte pages) - supports firmware/image storage without parallel bus routing |
| Supply Voltage | 2.7V to 3.6V single supply - eliminates level-shifting in 3.3V systems |
| Max Clock Frequency | 13 MHz - enables ~6.5 MB/s burst read throughput via SPI |
| Page Program Time | 7 ms typical - allows rapid field updates with minimal host wait cycles |
| Page-to-Buffer Transfer | 120 µs typical - enables fast preload of next page during active programming |
| Standby Current | 3 µA typical - supports ultra-low-power retention in battery-backed systems |
| Active Read Current | 4 mA typical at 13 MHz - balances speed and power in continuous streaming |
| Operating Temp | -40°C to +85°C industrial range - qualified for automotive infotainment and industrial HMI |
Pinout & Package
AT45DB321-TI is available in 28-pin TSOP-I (Type 1) and 28-ball CBGA packages. Pin functions are electrically identical across both packages; mechanical layout differs per JEDEC standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low SPI slave enable; falling edge initiates instruction decode sequence |
| SCK | Serial Clock | Master-generated clock; supports SPI Modes 0 (CPOL=0) and 3 (CPOL=1) |
| SI | Serial Input | Input-only data line for opcodes, addresses, and buffer writes (MSB-first) |
| SO | Serial Output | Output-only data line for read data and status register (tri-stated when CS high) |
| WP | Hardware Write Protect | Low = lock first 256 pages; internally pulled high - optional external tie-high |
| RESET | Chip Reset | Active-low asynchronous reset; terminates ongoing operation and clears state machine |
| RDY/BUSY | Open-drain Status Indicator | Low = device busy (erase/program/transfer); requires external pull-up resistor |
| VCC / GND | Power Supply | 2.7–3.6V core supply; decoupling capacitor required within 10 mm of pins |
Key Features
| Feature | Design Value |
|---|---|
| Dual SRAM Buffers | Two independent 528-byte buffers enable pipelined operation: receive new data into one buffer while programming flash from the other |
| Single-Cycle Reprogram | Integrated erase+program in one command (e.g., opcode 83H) - no separate erase step required before writing |
| Hardware Page Protection | WP pin disables reprogramming of first 256 pages - prevents accidental overwrite of boot code or calibration data |
| Flexible Erase Granularity | Supports page-erase (tPE ≤10 ms), block-erase (8 pages, tBE ≤15 ms), and sector-level management for optimized wear leveling |
| Status Register Polling | Bit-7 (RDY/BUSY) readable via opcode 57H - enables software-driven timing control without external pin monitoring |
| Auto Page Rewrite | Opcode 58H/59H performs atomic read-modify-write on a page - essential for partial-page updates without host-side buffering |
Applications
| Digital Voice Recorder | Industrial HMI Firmware Storage |
|---|---|
Use Scenario: Standalone portable voice recorder capturing and replaying audio clips up to 30 seconds. IC Role / Device Role / Timing Role: Nonvolatile storage for compressed PCM or ADPCM audio frames; accessed sequentially via SPI DMA bursts. Use Value: Dual-buffer architecture allows uninterrupted recording during flash page reprogramming - eliminating audio dropouts during overwrite cycles. |
Use Scenario: Touchscreen-based human-machine interface in factory automation panels requiring field-upgradable UI assets and logic. IC Role / Device Role / Timing Role: Firmware and bitmap storage for microcontroller-executed GUI; updated over CAN or USB-to-SPI bridge. Use Value: 2.7V-only operation ensures compatibility with 3.3V industrial rails; hardware WP protects bootloader partition from corruption during OTA updates. |
| Medical Sensor Data Logger | Automotive Infotainment Bootloader Storage |
Use Scenario: Battery-powered wearable sensor node logging ECG/temperature data at 1 kHz for 24-hour periods. IC Role / Device Role / Timing Role: Cyclic buffer for time-series samples; managed via page-erase + page-program to minimize write amplification. Use Value: 3 µA standby current extends battery life beyond 6 months; page-level erase granularity reduces energy per write vs. full-chip erase. |
Use Scenario: Secondary bootloader storage in automotive head unit, holding signed firmware images for secure boot verification. IC Role / Device Role / Timing Role: Secure nonvolatile storage for cryptographic keys and verified firmware signatures; accessed only during cold boot. Use Value: Industrial temperature rating (-40°C to +85°C) and 2.7–3.6V supply tolerance ensure reliable operation across vehicle cabin thermal profiles. |
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-TI | Successor with enhanced reliability, extended endurance (100k program/erase cycles vs. 10k), and improved data retention (20 years @ 85°C) | Same pinout and command set; recommended for new designs per Microchip's official guidance | Select AT45DB321B-TI for production releases requiring longer lifecycle support and higher write endurance. |
| W25Q32JVSSIQ | 32 Mbit Quad SPI NOR Flash; 4-line I/O mode doubles throughput; no internal buffers; requires external erase management | Lacks dual-buffer concurrency; better suited for XIP or high-speed code execution than streaming data capture | Choose W25Q32JVSSIQ when system prioritizes raw read speed or supports QSPI controllers, but accept added host firmware complexity for erase handling. |
Compared with AT45DB321B-TI, the AT45DB321-TI offers identical functionality but lower endurance and retention - making it suitable for cost-sensitive legacy designs where update frequency is low. Versus W25Q32JVSSIQ, AT45DB321-TI provides built-in buffering and simpler command protocol at the expense of peak bandwidth and density scalability.
Availability
AT45DB321-TI is available at Aetrix Electronics and suitable for digital voice recorders, industrial HMI firmware storage, medical data loggers, automotive infotainment systems, and portable instrumentation requiring stable component supply across extended product lifecycles.
Supply support for AT45DB321-TI 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 memory solutions, with a focus on robust, long-lifecycle components for industrial and automotive markets.
The AT45DB321-TI belongs to Microchip's DataFlash family - designed specifically for embedded systems needing serial nonvolatile storage with concurrent buffer access, low-voltage operation, and simplified in-system reprogramming without high-voltage programming signals.
FAQ
What is the maximum clock frequency supported by the AT45DB321-TI?
The AT45DB321-TI supports a maximum serial clock (SCK) frequency of 13 MHz, as specified in its AC characteristics table. This enables high-throughput data transfers - for example, a full 528-byte page read completes in under 420 µs at 13 MHz. The device maintains timing compliance across its full industrial temperature range (-40°C to +85°C) and 2.7–3.6V supply window. Exceeding 13 MHz may cause command misreads or data corruption.
Does the AT45DB321-TI require a high-voltage programming signal?
No, the AT45DB321-TI does not require any high-voltage programming signal. It operates entirely from a single 2.7–3.6V supply for both read and program/erase operations. All programming cycles - including page erase, page program, and auto page rewrite - are internally self-timed and powered solely by VCC. This eliminates the need for charge pumps or external HV generators, simplifying board design and improving system reliability.
How does the dual-buffer architecture of the AT45DB321-TI improve system performance?
The AT45DB321-TI's two independent 528-byte SRAM buffers allow true concurrency: while one buffer streams data into main memory (e.g., via opcode 83H), the other can simultaneously accept new data from the host via SI. This eliminates idle time during flash programming, enabling continuous data capture in voice recorders or sensor loggers. The 120 µs typical page-to-buffer transfer time further accelerates pipeline readiness.
Can the AT45DB321-TI be used in SPI Mode 1 or Mode 2?
No, the AT45DB321-TI is explicitly compatible only with SPI Modes 0 and 3, as confirmed in its datasheet description and timing diagrams. Mode 0 (CPOL=0, CPHA=0) and Mode 3 (CPOL=1, CPHA=1) define the valid clock polarity and phase relationships for SI/SO sampling. Using Mode 1 or Mode 2 will result in incorrect opcode decoding or data corruption, because the device samples input on the first SCK edge and outputs on the second - behavior fixed per hardware design.
What is the purpose of the RDY/BUSY pin on the AT45DB321-TI?
RDY/BUSY is an open-drain output that signals internal device activity: it is pulled low during any self-timed operation - including page program (tP ≤15 ms), block erase (tBE ≤15 ms), page-to-buffer transfer (tXFR ≤350 µs), or status register reads. Host systems use this pin (with external pull-up) to avoid polling or to synchronize command issuance. Bit-7 of the status register mirrors this state, enabling software-only polling if the pin is unused.
AT45DB321-TI 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT45DB321-TI FAQ
1.How can I place an order for AT45DB321-TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT45DB321-TI 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-TI reliable?
The price and inventory of AT45DB321-TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT45DB321-TI is usually 5 days.
3.What payment methods are accepted for AT45DB321-TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT45DB321-TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT45DB321-TI?
AT45DB321-TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT45DB321-TI 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-TI?
For technical support, including AT45DB321-TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT45DB321-TI requirements.
6.How does Aetrix verify that AT45DB321-TI is sourced from the original manufacturer or authorized distributors?
All AT45DB321-TI 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-TI meets industry standards.
7.What is the process for return or replacement of AT45DB321-TI?
All AT45DB321-TI units undergo pre-shipment inspection (PSI). If there is an issue with AT45DB321-TI, 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-TI part is unused and in its original packaging.
Return procedure for AT45DB321-TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT45DB321-TI 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
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