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Microchip Technology AT49BV322DT-70TU-T
- Part No.:
- AT49BV322DT-70TU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49BV322DT-70TU-T.pdf
- Description:
- IC FLASH 32MBIT PARALLEL 48TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,279
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Product details
Overview
AT49BV322DT-70TU-T from Microchip Technology (formerly Atmel) is a 32-Mbit (2M × 16 / 4M × 8) single-supply Flash memory IC with 70 ns access time, sector erase architecture (63 × 64 KB + 8 × 8 KB), and suspend/resume capability for in-system programming. It operates at 2.65–3.6 V, supports byte/word configuration via BYTE pin, and is used in embedded boot code storage, firmware update modules, and industrial controller nonvolatile data retention.
For engineers reviewing the AT49BV322DT-70TU-T datasheet, AT49BV322DT-70TU-T pinout, AT49BV322DT-70TU-T application, or AT49BV322DT-70TU-T equivalent, key selection considerations include sector lockdown support, CFI compliance, RDY/BUSY open-drain signaling, VPP-controlled write acceleration, and TSOP-48/CBGA-48 package compatibility with legacy 3V Flash designs.
Technical Context
This device implements a command-register-based Flash architecture with dual-mode addressing (x8/x16), enabling flexible integration into 8-bit and 16-bit microcontroller buses. Its erase suspend/resume and program suspend/resume functions allow concurrent read/program operations across non-overlapping sectors - critical for real-time firmware updates without halting system execution.
The internal state machine handles embedded timing for chip/sector erase (max 100 ms per sector) and word program (10 µs), with status reporting via I/O5 (erase/program fail), I/O3 (VPP level), I/O6 (toggle bit), I/O7 (data polling), and dedicated RDY/BUSY pin. Configuration register setting (00/01) determines automatic return to read mode or requirement of Product ID Exit command after successful operations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (2,097,152 × 16-bit or 4,194,304 × 8-bit) - supports full firmware images for mid-complexity MCUs. |
| Access Time | 70 ns - enables direct interface with 14 MHz bus systems without wait states. |
| Supply Voltage | 2.65 V to 3.6 V - compatible with 3.3 V logic rails and eliminates need for separate VCC/VPP supplies. |
| Erase Architecture | 71 sectors: 63 × 64 KB + 8 × 8 KB - allows granular firmware partitioning (e.g., bootloader + application + config). |
| Program Time | 10 µs per word - supports high-throughput field updates when combined with Dual-word Program mode at VPP = 9.5 V. |
| Erase End Detection | RDY/BUSY pin (open-drain), Data Polling (I/O7), Toggle Bit (I/O6) - provides hardware- and software-synchronized operation completion signaling. |
| Endurance | 100,000 erase cycles - validated for frequent firmware revision cycles in industrial gateways and PLCs. |
| CFI Support | Common Flash Interface compliant - enables auto-configuration of drivers in Linux MTD or U-Boot without hard-coded timing parameters. |
Pinout & Package
AT49BV322DT-70TU-T is available in a 48-pin Thin Small Outline Package (TSOP Type I, 12 × 20 mm, 0.5 mm pitch) and a 48-ball Ceramic Ball Grid Array (CBGA). Both packages support identical pin functions and are footprint-compatible for design flexibility.
| 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 serves dual role as LSB address (A−1) in x8 mode. |
| I/O15 / A−1 | Mode-Dependent Terminal | In x16 mode: data bit 15; in x8 mode: A−1 input enabling byte-level addressing within 16-bit words. |
| BYTE | Configuration Input | Logic high = x16 mode (I/O0–I/O15 active); logic low = x8 mode (I/O0–I/O7 active, I/O8–I/O14 tri-stated). |
| CE, OE, WE | Control Enables | Three independent enables prevent bus contention; CE+OE low + WE high = read; CE+WE low + OE high = write. |
| RDY/BUSY | Open-Drain Status Output | Active-low during internal operations; supports wired-OR connection for multi-device status monitoring. |
| VPP | Write Protection & Acceleration | Below 0.4 V: inhibits program/erase; ≥1.65 V: enables normal operation; 9.5–10.0 V: enables accelerated Dual-word Program mode. |
| RESET | Hardware Initialization | Pulling low halts ongoing operations and forces high-impedance outputs; release returns to read/standby based on CE/OE/WE state. |
| NC | No Connect | Pin 23 (TSOP) / Ball E6 (CBGA) - must be left unconnected; no internal connection. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Lockdown | Per-sector write-protection activation via six-cycle command; prevents accidental overwrite of bootloader or security-critical code. |
| Erase/Program Suspend | Interrupt long-running erase (≤15 µs suspend latency) or program (≤20 µs suspend latency) to service real-time reads from other sectors. |
| 128-bit Protection Register | Factory-programmed 64-bit block A + user-programmable/lockable 64-bit block B - enables secure key storage and anti-cloning mechanisms. |
| Single-Pulse Program Mode | After entering six-byte sequence, subsequent writes require only single WE pulse - reduces host CPU overhead during bulk programming. |
| Hardware Data Protection | VCC sense (<1.8 V inhibits programming), 10 ms power-on delay, and control-line gating (OE low/CE high/WE high blocks writes) prevent spurious writes. |
| 5.5 V-Tolerant Inputs | Address and control pins accept 0–5.5 V signals while powered from 2.65–3.6 V - simplifies level-shifting in mixed-voltage systems. |
Applications
| Industrial PLC Firmware Storage | Automotive Infotainment Bootloader |
|---|---|
Use Scenario: Storing and updating ladder logic programs and I/O configuration tables in programmable logic controllers operating in harsh temperature environments. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding startup firmware and runtime parameter tables; accessed during cold start and hot firmware patching. Use Value: Sector lockdown protects bootloader integrity; 100,000-cycle endurance supports decades of field updates; CFI enables driver auto-detection in real-time OS. | Use Scenario: Hosting primary bootloader and secure boot verification code in head-unit ECUs requiring ASIL-B-aware firmware resilience. IC Role / Device Role / Timing Role: First-stage boot memory mapped at reset vector; provides authenticated code execution path before loading application binaries from eMMC. Use Value: 128-bit protection register stores cryptographic keys; VPP-controlled write acceleration speeds manufacturing programming; RDY/BUSY enables deterministic boot timing. |
| Medical Device Configuration Archive | Network Router Firmware Partitioning |
Use Scenario: Retaining calibration data, user preferences, and regulatory audit logs across power cycles in portable diagnostic equipment. IC Role / Device Role / Timing Role: Parameter storage memory with atomic sector erase - ensures consistent state recovery after unexpected shutdowns. Use Value: Independent 8 KB sector erase allows safe overwriting of log entries without disturbing calibration constants stored in adjacent 64 KB sectors. | Use Scenario: Partitioning OpenWrt firmware image into separate boot, kernel, rootfs, and overlay sections on edge routers with limited PCB area. IC Role / Device Role / Timing Role: Multi-sector Flash memory enabling A/B firmware swapping and rollback-safe OTA updates. Use Value: Erase suspend permits simultaneous HTTP server response handling (reading config) while background firmware validation (erasing target sector) proceeds. |
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 | 32 Mbit, 70 ns, 3.0–3.6 V supply; lacks CFI, no VPP pin, no sector lockdown; uses different command set. | Requires custom driver adaptation; unsuitable for secure boot or field-upgrade scenarios needing lockdown or CFI. | Select when cost sensitivity outweighs need for standardized interface or security features. |
| MX29LV320ETTI-70G | 32 Mbit, 70 ns, 3.0–3.6 V; includes CFI and sector protection, but no erase/program suspend or 128-bit protection register. | Supports basic firmware updates and driver auto-configuration, but cannot perform concurrent read/program during erase. | Select for simpler upgrade workflows where suspend/resume is not required and security needs are minimal. |
Compared with SST39VF3201C-70-4C-EKE and MX29LV320ETTI-70G, the AT49BV322DT-70TU-T uniquely combines CFI compliance, hardware-accelerated programming via VPP, per-sector lockdown, and true suspend/resume - making it the only option among the three suitable for safety-critical, field-upgradable, and secure-boot embedded systems.
Availability
AT49BV322DT-70TU-T is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive infotainment bootloader deployment, and medical device configuration archiving requiring stable component supply and long-term lifecycle support.
Supply support for AT49BV322DT-70TU-T 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 supply chain responsibility for legacy Atmel Flash products including the AT49BV322D(T) family.
The AT49BV322D(T) product line was designed for reliable, in-system programmable nonvolatile storage in resource-constrained embedded systems requiring sector granularity, hardware write protection, and real-time operational flexibility.
FAQ
What is the maximum operating voltage on the VPP pin of the AT49BV322DT-70TU-T?
The absolute maximum voltage on the VPP pin of the AT49BV322DT-70TU-T is +9.5 V relative to ground. Operation above this level risks permanent damage. For accelerated Dual-word Program mode, VPP must be set to 9.5 V; for standard program/erase, VPP ≥ 1.65 V is sufficient. The device will inhibit all write operations if VPP falls below 0.4 V, providing robust hardware write protection. This specification is defined in the Absolute Maximum Ratings table of the AT49BV322DT-70TU-T datasheet.
Does the AT49BV322DT-70TU-T support both x8 and x16 data bus configurations?
Yes, the AT49BV322DT-70TU-T supports both configurations via the BYTE pin. When BYTE = HIGH, the device operates in x16 mode with I/O0–I/O15 active for 16-bit data transfers. When BYTE = LOW, it operates in x8 mode: only I/O0–I/O7 are active, I/O8–I/O14 are tri-stated, and I/O15 functions as A−1 (LSB address input). This dual-mode capability allows seamless integration into 8-bit and 16-bit microcontroller systems without redesigning the memory interface. The AT49BV322DT-70TU-T's internal address decoding adapts automatically to the selected mode.
How does sector lockdown work on the AT49BV322DT-70TU-T, and can locked sectors be unlocked?
Sector lockdown on the AT49BV322DT-70TU-T is enabled per sector using a six-bus-cycle command. Once activated, a locked sector becomes read-only: its contents cannot be erased or programmed until the next power cycle or RESET assertion. Lockdown is irreversible during normal operation - no software command unlocks it. The AT49BV322DT-70TU-T provides software detection of lockdown status by reading address 00002H within a sector: I/O0 = HIGH indicates lockdown is active. This feature ensures bootloader integrity in safety-critical applications where accidental corruption must be physically prevented.
What status signaling methods does the AT49BV322DT-70TU-T provide to detect end-of-erase or end-of-program operations?
The AT49BV322DT-70TU-T provides three independent status signaling methods: (1) RDY/BUSY pin - open-drain output pulled low during internal operations; (2) Data Polling on I/O7 - returns complement of written data during programming, then true data upon completion; (3) Toggle Bit on I/O6 - toggles between 0/1 during operations and stabilizes upon completion. All three methods function regardless of configuration register setting (00 or 01), though their exact behavior differs slightly. These redundant mechanisms ensure robust synchronization in both hardware- and software-driven Flash management systems using the AT49BV322DT-70TU-T.
Is the AT49BV322DT-70TU-T pin-compatible with other members of the AT49BV322D(T) family, such as AT49BV322D-70TU?
Yes, the AT49BV322DT-70TU-T is pin-compatible with the AT49BV322D-70TU and AT49BV322DT-70TU variants. All share identical 48-pin TSOP and 48-ball CBGA packages, identical pin functions (A0–A20, I/O0–I/O15/A−1, CE/OE/WE, RDY/BUSY, VPP, RESET, BYTE, NC), and identical electrical characteristics. The "T" suffix denotes tape-and-reel packaging, while "-70" specifies 70 ns access time and "TU" indicates commercial temperature range (0°C to +70°C). No PCB layout changes are required when substituting between these variants - only ordering and packaging differ. This compatibility simplifies inventory management and design reuse for the AT49BV322DT-70TU-T and related parts.
AT49BV322DT-70TU-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 48-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 32Mbit
- Memory Organization:
- 2M x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 120µs
- 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
AT49BV322DT-70TU-T FAQ
1.How can I place an order for AT49BV322DT-70TU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV322DT-70TU-T 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 AT49BV322DT-70TU-T reliable?
The price and inventory of AT49BV322DT-70TU-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV322DT-70TU-T is usually 5 days.
3.What payment methods are accepted for AT49BV322DT-70TU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV322DT-70TU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV322DT-70TU-T?
AT49BV322DT-70TU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV322DT-70TU-T 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 AT49BV322DT-70TU-T?
For technical support, including AT49BV322DT-70TU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV322DT-70TU-T requirements.
6.How does Aetrix verify that AT49BV322DT-70TU-T is sourced from the original manufacturer or authorized distributors?
All AT49BV322DT-70TU-T 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 AT49BV322DT-70TU-T meets industry standards.
7.What is the process for return or replacement of AT49BV322DT-70TU-T?
All AT49BV322DT-70TU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV322DT-70TU-T, 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 AT49BV322DT-70TU-T part is unused and in its original packaging.
Return procedure for AT49BV322DT-70TU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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