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Microchip Technology AT49BV322AT-70TU
- Part No.:
- AT49BV322AT-70TU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49BV322AT-70TU.pdf
- Description:
- IC FLASH 32MBIT PARALLEL 48TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,963
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Product details
Overview
AT49BV322AT-70TU from Microchip Technology (formerly Atmel) is a 32-Mbit (2M × 16 / 4M × 8) single-supply Flash memory IC with sector erase architecture, 70 ns access time, and dual-mode byte/word data interface. It supports in-system programming via 2.65–3.6 V supply, features Erase/Program Suspend for concurrent read/program operations, and is used in embedded boot code storage and firmware update applications.
For engineers reviewing the AT49BV322AT-70TU datasheet, AT49BV322AT-70TU pinout, AT49BV322AT-70TU application, or AT49BV322AT-70TU equivalent, key selection criteria include sector lockdown capability, CFI compliance, RDY/BUSY and status-bit polling support, TSOP-48/CBGA-48 package options, and 100,000 erase cycle endurance.
Technical Context
This parallel-interface NOR Flash implements a 21-bit address bus (A0–A20) and configurable x8/x16 data width via BYTE pin control. Its command-set architecture uses six-byte sequences for chip/sector erase and lockdown, and includes dedicated status bits on I/O2–I/O7 plus open-drain RDY/BUSY for real-time operation monitoring.
The device integrates hardware protection including VPP-dependent program/erase enable (0.9 V threshold), power-on delay (10 ms), and VCC sense (<1.8 V inhibition). It supports Common Flash Interface (CFI) query mode (98h @ 55h) for runtime configuration discovery and includes a factory-programmed 64-bit block + user-programmable/lockable 64-bit block in its 128-bit protection register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (2,097,152 × 16 or 4,194,304 × 8) |
| Access Time | 70 ns - guarantees maximum read latency under worst-case VCC and temperature |
| Supply Voltage | 2.65–3.6 V - enables direct connection to 3.3 V logic without level shifters |
| Erase Endurance | 100,000 cycles - validated minimum sector erase cycles before parametric failure |
| Program Time | 12 µs per word - defines minimum write pulse duration for reliable bit programming |
| Sector Architecture | 71 sectors: sixty-three 64 KB + eight 8 KB - enables granular firmware partitioning and secure boot code isolation |
| Standby Current | 13 µA - enables low-power retention in battery-backed or sleep-mode systems |
Pinout & Package
AT49BV322AT-70TU is available in 48-pin TSOP Type I (thin small-outline package) and 48-ball CBGA (chip-scale ball grid array) packages. Both variants share identical pin functions and signal mapping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A20 | Address Inputs | 21-bit address bus supporting full 2M-word or 4M-byte addressing space |
| I/O0–I/O14 | Data I/O (x16) / I/O0–I/O7 (x8) | Configurable bidirectional data path; I/O15 repurposed as A−1 LSB in byte mode |
| I/O15 / A−1 | Data I/O (Word) or Address LSB (Byte) | Mode-selectable terminal enabling x16 or x8 interface without external logic |
| BYTE | Interface Mode Select | Logic high = x16 mode (I/O0–I/O15 active); low = x8 mode (I/O0–I/O7 active, I/O8–I/O14 tri-stated) |
| CE, OE, WE | Chip/Output/Write Enable | Three independent controls prevent bus contention and support standard microprocessor timing |
| RDY/BUSY | Open-Drain Status Output | Active-low indicates ongoing program/erase; supports wired-OR of multiple devices |
| VPP | Write Protection Voltage Input | Enables program/erase only when ≥0.9 V; inhibits if <0.4 V - prevents accidental writes |
| RESET | Hardware Initialization Input | Forces device into read/standby mode; required to exit suspend or error states |
Key Features
| Feature | Design Value |
|---|---|
| Sector Erase Suspend/Resume | Allows interruption of sector erase to read/program other sectors - enables real-time firmware updates without halting system execution |
| Program Suspend/Resume | Pauses active word programming to read non-target sectors - supports background diagnostics during write operations |
| Sector Lockdown | Per-sector write-protection enabled via software command - isolates immutable boot code from field-updatable application partitions |
| Common Flash Interface (CFI) | Standardized query table accessible at 98h/55h - enables OS/driver auto-configuration without hard-coded timing parameters |
| 128-bit Protection Register | Factory-block A (64-bit unique ID) + user-block B (programmable/lockable) - supports secure device authentication and firmware binding |
Applications
| Boot Code Storage | Firmware Field Update |
|---|---|
Use Scenario: Storing primary bootloader and BIOS/UEFI initialization code in industrial PLCs and network routers. IC Role / Device Role / Timing Role: Non-volatile boot memory mapped to CPU reset vector; accessed in x16 mode for fast instruction fetch. Use Value: Sector lockdown prevents corruption of critical startup code while allowing field updates to application firmware in adjacent sectors. | Use Scenario: Over-the-air (OTA) firmware upgrades in medical imaging equipment requiring zero-downtime patching. IC Role / Device Role / Timing Role: Dual-bank flash storage where one bank runs live firmware while the other receives new image via Erase Suspend-enabled background write. Use Value: Suspend/resume capability allows uninterrupted device operation during multi-sector reprogramming sequences. |
| Secure Device Authentication | Industrial HMI Data Logging |
Use Scenario: Tamper-resistant serial number and cryptographic key storage in smart metering endpoints. IC Role / Device Role / Timing Role: Secure identity anchor using factory-programmed 64-bit block A and locked user-block B containing device-specific keys. Use Value: Hardware-enforced write protection ensures keys remain immutable after provisioning - meeting IEC 62443-3-3 SL2 requirements. | Use Scenario: Local event logging in railway signaling controllers where data must survive power loss and EMI events. IC Role / Device Role / Timing Role: High-reliability parameter storage using 100K-cycle endurance and RDY/BUSY polling for deterministic write completion detection. Use Value: 13 µA standby current and 70 ns access enable low-power, real-time logging without DRAM backup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF3201C-70-4C-EKE | 3.0–3.6 V supply only; no VPP pin; lacks CFI and 128-bit protection register | Lower security assurance; not suitable for authenticated boot or regulatory-compliant secure storage | Select when cost sensitivity outweighs secure boot and field-upgrade flexibility requirements |
| MX29LV320ETTI-70G | Same 32 Mbit density and 70 ns speed but requires 3.0–3.6 V only; no BYTE pin - x16-only interface | Inflexible data bus width; incompatible with legacy x8 microcontrollers without glue logic | Choose for x16-only designs where sector lockdown and suspend features are non-critical |
Compared with SST39VF3201C-70-4C-EKE and MX29LV320ETTI-70G, the AT49BV322AT-70TU uniquely combines VPP-based hardware write protection, CFI discoverability, and dual-mode interface - making it the only option among the three supporting secure, flexible, and backward-compatible firmware storage in resource-constrained embedded systems.
Availability
AT49BV322AT-70TU is available at Aetrix Electronics and suitable for industrial control, medical device boot storage, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.
Supply support for AT49BV322AT-70TU 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 technical and manufacturing continuity for legacy Atmel Flash products including the AT49BV series.
The AT49BV322AT-70TU belongs to Microchip's parallel NOR Flash product line, designed specifically for reliable, in-system programmable code storage in safety-critical and long-lifecycle embedded applications.
FAQ
What is the function of the BYTE pin on the AT49BV322AT-70TU?
The BYTE pin on the AT49BV322AT-70TU selects between x8 and x16 data interface modes. When pulled high, the device operates in 16-bit mode with I/O0–I/O15 active; when pulled low, it operates in 8-bit mode with only I/O0–I/O7 active and I/O15 repurposed as address bit A−1. This eliminates need for external bus-width translation logic in mixed-architecture systems.
Does the AT49BV322AT-70TU support Common Flash Interface (CFI)?
Yes, the AT49BV322AT-70TU fully supports CFI. Entering CFI Query mode requires writing 98h to address 55h, after which standardized parameter tables (device geometry, timings, command sets) can be read from defined offsets. This enables automatic driver configuration in Linux MTD and U-Boot environments without hardcoded flash geometry definitions.
How does sector lockdown work on the AT49BV322AT-70TU?
Sector lockdown on the AT49BV322AT-70TU is enabled per-sector via a six-cycle command sequence targeting a specific sector address. Once locked, that sector becomes permanently read-only until next power cycle or RESET assertion. Lockdown status is verified by reading address 00002h within the sector - I/O0 = high indicates lockdown active. This protects boot code from accidental overwrite during field updates.
What are the valid voltage ranges for VPP and how does it affect AT49BV322AT-70TU operation?
VPP on the AT49BV322AT-70TU must be driven to ≥0.9 V to enable program/erase operations; voltages <0.4 V inhibit all write functions. The pin must never float and requires stable decoupling. This dual-threshold design provides robust hardware-level write protection independent of software state - preventing corruption during brown-out or reset glitches.
Can the AT49BV322AT-70TU be used in both TSOP and CBGA packages interchangeably?
Yes - the AT49BV322AT-70TU is offered in both 48-pin TSOP Type I and 48-ball CBGA packages with identical pinout, signal definitions, timing, and electrical specifications. PCB layout must respect package-specific thermal and mechanical requirements, but firmware, drivers, and command sequences are fully interchangeable between the two variants.
AT49BV322AT-70TU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 48-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:
- 4M x 8, 2M x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 200µs
- Access Time:
- 70 ns
- Voltage - Supply:
- 2.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TSOP
AT49BV322AT-70TU FAQ
1.How can I place an order for AT49BV322AT-70TU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV322AT-70TU 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 AT49BV322AT-70TU reliable?
The price and inventory of AT49BV322AT-70TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV322AT-70TU is usually 5 days.
3.What payment methods are accepted for AT49BV322AT-70TU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV322AT-70TU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV322AT-70TU?
AT49BV322AT-70TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV322AT-70TU 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 AT49BV322AT-70TU?
For technical support, including AT49BV322AT-70TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV322AT-70TU requirements.
6.How does Aetrix verify that AT49BV322AT-70TU is sourced from the original manufacturer or authorized distributors?
All AT49BV322AT-70TU 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 AT49BV322AT-70TU meets industry standards.
7.What is the process for return or replacement of AT49BV322AT-70TU?
All AT49BV322AT-70TU units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV322AT-70TU, 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 AT49BV322AT-70TU part is unused and in its original packaging.
Return procedure for AT49BV322AT-70TU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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