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Microchip Technology AT49BV321-90TI
- Part No.:
- AT49BV321-90TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 46-TFBGA
- Datasheet:
-
AT49BV321-90TI.pdf
- Description:
- IC FLASH 32MBIT PARALLEL 46UBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,156
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Product details
Overview
AT49BV321-90TI from Microchip Technology (formerly Atmel) is a 32-Mbit (2M × 16 / 4M × 8) single-supply 3.0V Flash memory IC with sector erase architecture, 85 ns access time, and byte/word programmability. It supports in-system programming in embedded controllers, firmware storage, and boot code applications requiring nonvolatile reprogrammability.
For engineers reviewing the AT49BV321-90TI datasheet, AT49BV321-90TI pinout, AT49BV321-90TI application, or AT49BV321-90TI equivalent, key selection considerations include its dual-mode BYTE-selectable interface, RDY/BUSY open-drain output, sector lockdown security, 128-bit protection register, and hardware VPP write protection - all critical for secure, field-upgradable firmware designs.
Technical Context
The AT49BV321-90TI implements a command-register-based architecture with embedded program/erase algorithms, supporting both x8 and x16 data widths via the BYTE pin. Its 71-sector organization includes eight 8K-byte (4K-word) and sixty-three 64K-byte (32K-word) sectors, each individually lockable.
It features Erase Suspend/Resume and Program Suspend/Resume functions enabling concurrent read/program operations across non-erasing sectors, plus status monitoring via RDY/BUSY, Data Polling (I/O7), Toggle Bit (I/O6), and dedicated status bits (I/O2–I/O7) configurable via a user-settable register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (2,097,152 × 16 or 4,194,304 × 8) - supports firmware images up to ~4 MB in byte mode or ~2 MB in word mode. |
| Access Time | 85 ns - enables direct execution from flash (XIP) in microcontroller systems with ≤11.8 MHz bus timing. |
| Supply Voltage | 2.65V to 3.3V - compatible with 3.3V logic domains and low-power embedded rails without level shifters. |
| Program Time | 15 µs per word - reduces firmware update latency during field upgrades or factory programming. |
| Sector Erase Time | 200 ms max per sector - allows selective reprogramming of application partitions without full chip erase. |
| Standby Current | 10 µA - supports battery-backed retention in always-on IoT edge nodes and sleep-mode MCU systems. |
| Package | 48-pin TSOP Type I - industry-standard footprint for high-density PCB layouts with thermal and mechanical reliability. |
Pinout & Package
AT49BV321-90TI is packaged in a 48-pin Thin Small Outline Package (TSOP Type I), pin-compatible with JEDEC MO-143AC. The package supports surface-mount reflow assembly and provides standard thermal dissipation for sustained program/erase cycles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A20 | Address Inputs | 21-bit address bus supporting full 2M-word (x16) or 4M-byte (x8) addressing space. |
| I/O0–I/O14 | Data I/O (x16) | 15-bit bidirectional data bus; I/O15 functions as A−1 (LSB address) in byte mode when BYTE = 0. |
| I/O15 / A−1 | Mode-Dependent Terminal | In word mode (BYTE = 1): data bit 15; in byte mode (BYTE = 0): LSB address input for x8 operation. |
| BYTE | Bus Width Select | Logic-high selects x16 mode (I/O0–I/O15 active); logic-low selects x8 mode (I/O0–I/O7 active, I/O8–I/O14 tristated). |
| CE, OE, WE | Control Inputs | Standard asynchronous SRAM-like control: CE enables device, OE enables output, WE initiates write - prevents bus contention. |
| RDY/BUSY | Open-Drain Status Output | Active-low indicates ongoing program/erase; supports wired-OR connection for multi-device status monitoring. |
| VPP | Write Protection Input | Must be ≥1.65V for program/erase; <0.8V disables all writes - enables hardware-level firmware write lock. |
| RESET | Initialization Input | Asynchronous reset halts operations and forces high-impedance outputs - essential for safe power sequencing and recovery. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Lockdown | Per-sector write-protection enabled via command; prevents accidental overwrite of boot code while allowing runtime updates to application sectors. |
| Erase/Program Suspend | Interrupts active erase or program to read/program another sector - enables real-time firmware patching without halting system operation. |
| 128-bit Protection Register | Factory-programmed 64-bit block + user-programmable 64-bit block (lockable) - supports secure key storage and anti-cloning mechanisms. |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns), and VPP voltage monitoring prevent spurious writes during power transients or EMI events. |
| Flexible Status Monitoring | Three independent methods - RDY/BUSY pin, Data Polling (I/O7), Toggle Bit (I/O6) - allow host software or hardware to optimize polling efficiency. |
Applications
| Boot Code Storage | Firmware Update Partition |
|---|---|
Use Scenario: Storing primary bootloader and secure startup routines in industrial PLCs and medical devices. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped to CPU reset vector; accessed at power-on before RAM initialization. Use Value: Sector lockdown ensures boot code integrity; RDY/BUSY signaling synchronizes CPU fetch with flash readiness. | Use Scenario: Hosting field-upgradable application firmware in network routers and smart meters. IC Role / Device Role / Timing Role: Reconfigurable code storage partitioned into protected boot + writable application sectors. Use Value: Erase suspend allows background OTA update download while maintaining live packet forwarding. |
| Secure Configuration Storage | Embedded Controller Code Memory |
Use Scenario: Storing encrypted calibration data and device-specific keys in automotive ECUs. IC Role / Device Role / Timing Role: Secure parameter repository using 128-bit protection register and sector lockdown. Use Value: Factory-block A provides unique ID; user-block B stores keys locked post-programming to prevent extraction. | Use Scenario: Executing control logic directly from flash in motor drives and HVAC controllers. IC Role / Device Role / Timing Role: XIP-capable instruction memory interfaced to 16-bit microcontroller bus. Use Value: 85 ns access time meets timing budget for 11.8 MHz bus clocks; BYTE pin enables legacy 8-bit peripheral compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF3201-90-4C-EKE | 3.3V-only, 32 Mbit, 90 ns access, no RDY/BUSY pin, no sector lockdown | Lacks hardware write protection and suspend/resume - suitable only for static firmware with infrequent updates | Choose when cost sensitivity outweighs security and real-time update requirements. |
| MX29LV320ETTI-90G | 3.0V, 32 Mbit, 90 ns, top/bottom boot configuration, no BYTE pin, no 128-bit protection register | Fixed boot block orientation; lacks byte/word mode flexibility and advanced security features | Prefer for legacy designs requiring pinout compatibility with older MX29 series but no sector-level security. |
Compared with SST39VF3201-90-4C-EKE and MX29LV320ETTI-90G, the AT49BV321-90TI uniquely delivers BYTE-selectable bus width, RDY/BUSY signaling, sector lockdown, and 128-bit protection - making it the only option among the three qualified for secure, field-upgradable embedded firmware with real-time operational continuity.
Availability
AT49BV321-90TI is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, automotive telematics, and networking equipment requiring stable component supply and long-term firmware storage reliability.
Supply support for AT49BV321-90TI 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 AT49BV/LV32X family.
The AT49BV321-90TI belongs to Microchip's parallel-interface Flash memory product line, designed specifically for embedded systems requiring robust, in-system reprogrammable nonvolatile storage with hardware-enforced security and real-time operational flexibility.
FAQ
What is the difference between AT49BV321-90TI and AT49BV320-90TI?
The AT49BV321-90TI includes a BYTE pin that enables selectable x8/x16 data bus operation, whereas the AT49BV320-90TI operates exclusively in x16 mode. This makes AT49BV321-90TI compatible with both 8-bit and 16-bit microcontrollers, while AT49BV320-90TI is limited to 16-bit interfaces. Both share identical density, timing, and sector architecture.
Does AT49BV321-90TI support hardware write protection?
Yes, AT49BV321-90TI supports hardware write protection via the VPP pin: program and erase functions are disabled when VPP < 0.8V, and enabled only when VPP ≥ 1.65V. Additionally, sector lockdown and 128-bit protection register provide layered firmware security beyond basic voltage gating.
Can AT49BV321-90TI be used for execute-in-place (XIP) applications?
Yes, AT49BV321-90TI supports XIP with its 85 ns access time and standard asynchronous read interface. When interfaced to a microcontroller with appropriate wait-state configuration, it allows direct code execution from flash without copying to RAM - reducing boot time and memory overhead in resource-constrained systems.
How does the RDY/BUSY pin function on AT49BV321-90TI?
The RDY/BUSY pin on AT49BV321-90TI is an open-drain output that actively pulls low during internal program or erase cycles and releases (goes high-impedance) upon completion. This enables hardware-driven synchronization and OR-tying with other devices on shared status lines - a feature absent in the AT49BV320-90TI variant.
Is AT49BV321-90TI RoHS compliant and lead-free?
Yes, AT49BV321-90TI is RoHS compliant and lead-free. The "-TI" suffix denotes a lead-free, RoHS-compliant TSOP package per Microchip's packaging standards. Full compliance documentation, including material declarations and test reports, is available through Microchip's official product page for AT49BV321-90TI.
AT49BV321-90TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 46-TFBGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 32Mbit
- Memory Organization:
- 4M x 8, 2M x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 150µs
- Access Time:
- 90 ns
- Voltage - Supply:
- 2.65V ~ 3.3V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 46-µBGA (7.6x10.4)
AT49BV321-90TI FAQ
1.How can I place an order for AT49BV321-90TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV321-90TI 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 AT49BV321-90TI reliable?
The price and inventory of AT49BV321-90TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV321-90TI is usually 5 days.
3.What payment methods are accepted for AT49BV321-90TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV321-90TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV321-90TI?
AT49BV321-90TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV321-90TI 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 AT49BV321-90TI?
For technical support, including AT49BV321-90TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV321-90TI requirements.
6.How does Aetrix verify that AT49BV321-90TI is sourced from the original manufacturer or authorized distributors?
All AT49BV321-90TI 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 AT49BV321-90TI meets industry standards.
7.What is the process for return or replacement of AT49BV321-90TI?
All AT49BV321-90TI units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV321-90TI, 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 AT49BV321-90TI part is unused and in its original packaging.
Return procedure for AT49BV321-90TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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