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Microchip Technology AT49BV322D-70TU
- Part No.:
- AT49BV322D-70TU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49BV322D-70TU.pdf
- Description:
- IC FLASH 32MBIT PARALLEL 48TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,967
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Product details
Overview
AT49BV322D-70TU from Microchip Technology (formerly Atmel) is a 32-Mbit (2M × 16 / 4M × 8) single-supply Flash memory IC designed for embedded code storage and data logging in microcontroller-based systems. It operates at 2.65–3.6 V, delivers 70 ns access time, supports sector erase with 63 × 64 KB + 8 × 8 KB configuration, and features suspend/resume for concurrent read/program during erase - enabling real-time firmware updates in industrial controllers.
For engineers reviewing the AT49BV322D-70TU datasheet, AT49BV322D-70TU pinout, AT49BV322D-70TU application, or AT49BV322D-70TU equivalent, key selection considerations include its TSOP-48 package, byte/word mode flexibility via BYTE pin, CFI-compliant interface for auto-configuration, and hardware write protection via VPP pin voltage thresholding.
Technical Context
The AT49BV322D-70TU implements a command-register-based architecture with dual-mode addressing (x8/x16), enabling flexible integration into 8-bit or 16-bit bus systems. Its internal state machine handles erase, program, and suspend operations autonomously, using no external clocks - critical for deterministic timing in safety-critical boot code storage.
It integrates multiple status reporting methods: READY/BUSY open-drain output, Data Polling on I/O7, Toggle Bit on I/O6, and dedicated status bits on I/O5 (erase/program failure) and I/O3 (VPP level), all configurable via a two-state status register - allowing system software to select polling or interrupt-driven completion detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (2,097,152 × 16-bit words or 4,194,304 × 8-bit bytes) - supports full firmware images for mid-tier MCUs without external expansion. |
| Access Time | 70 ns - enables direct execution (XIP) from flash in systems with ≤14 MHz bus timing budgets. |
| Erase Architecture | 71 sectors: 63 × 64 KB + 8 × 8 KB - allows granular firmware partitioning (e.g., bootloader in protected 8 KB sectors, application in 64 KB blocks). |
| Program Time | 10 µs per word - supports high-throughput field updates when combined with Dual-word Program mode at VPP = 9.5 V. |
| Erase Time | 100 ms per sector - predictable latency for background erase during idle cycles in real-time OS environments. |
| End-of-Operation Detection | RDY/BUSY pin + Data Polling (I/O7) + Toggle Bit (I/O6) - provides hardware- and software-synchronized completion signaling for robust firmware update sequences. |
| Write Protection | VPP pin: <0.4 V inhibits programming/erasing; ≥1.65 V enables normal operation; 10.0 V accelerates Dual-word Program - enables secure, voltage-gated write enable in tamper-resistant designs. |
| Cycle Endurance | Minimum 100,000 erase cycles per sector - qualifies for >10-year field deployment in infrequently updated control applications. |
Pinout & Package
AT49BV322D-70TU is available in a 48-lead Thin Small Outline Package (TSOP Type I, 12 mm × 20 mm), RoHS-compliant, with standard JEDEC MO-141AC footprint. Pin functions are electrically identical between TSOP and CBGA variants; this part uses TSOP-48.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A20 | Address Inputs | 21-bit address bus supporting full 2M-word (x16) or 4M-byte (x8) addressing; A-1 function multiplexed on I/O15 in byte mode. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access - prevents bus contention in multi-device systems. |
| OE | Output Enable | Active-low output gate; used with CE to control data bus drive - enables shared-bus arbitration without external logic. |
| WE | Write Enable | Active-low write strobe; latches command addresses and data during programming/erase sequences - forms core of command-register interface. |
| BYTE | Bus Width Select | Logic-high = x16 mode (I/O0–I/O15 active); logic-low = x8 mode (I/O0–I/O7 active, I/O15 = A-1) - enables reuse across 8-bit and 16-bit host interfaces. |
| I/O0–I/O15 | Data I/O | Bidirectional data bus; I/O15 serves as LSB address input (A-1) in byte mode - eliminates need for external address demux in x8 configurations. |
| VPP | Write Voltage Control | Enables/disables programming/erasing based on voltage level (0.4 V threshold); 10 V enables accelerated Dual-word Program - provides hardware-level write gating independent of software state. |
| RESET | Hardware Initialization | Active-low reset; halts ongoing erase/program and forces high-impedance outputs - ensures safe recovery from power brownouts or watchdog timeouts. |
| RDY/BUSY | Operation Status Output | Open-drain active-low signal pulled low during internal erase/program - supports wired-OR of multiple flash devices on shared status line. |
| NC | No Connect | Unbonded pin; must be left floating - no routing or termination required. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Erase Flexibility | 63 large (64 KB) and 8 small (8 KB) independently lockable sectors - permits bootloader isolation in top/bottom boot blocks while enabling frequent application updates in larger regions. |
| Erase/Program Suspend | Interrupt long-running erase (≤15 µs suspend latency) to read or program other sectors - enables real-time responsiveness during firmware field upgrades without halting system operation. |
| 128-bit Protection Register | Factory-programmed 64-bit block A + user-programmable/lockable 64-bit block B - supports secure device identification and customer-specific key storage with irreversible locking. |
| Common Flash Interface (CFI) | Standardized query table accessible via 98h command at address 55h - allows bootloader or OS to auto-detect geometry, timing, and command sets without hard-coded assumptions. |
| Hardware Data Protection | VCC sense (<1.8 V inhibits program), 10 ms power-on delay, and VPP thresholding - prevents spurious writes during power ramp-up or brownout conditions. |
| Single-Pulse Program Mode | 6-byte entry sequence enables subsequent writes with single WE pulse - reduces host CPU overhead during bulk programming by eliminating repeated command re-entry. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader |
|---|---|
Use Scenario: Storing certified bootloader and safety-critical firmware in programmable logic controllers requiring field updates without downtime. IC Role / Device Role / Timing Role: Non-volatile code storage with sector lockdown protecting bootloader region and suspend-enabled background application updates. Use Value: Enables verified firmware patches during maintenance windows while maintaining runtime execution from unerased sectors - meeting IEC 61508 SIL-2 requirements for update integrity. | Use Scenario: Secure storage of FDA-approved boot code and calibration data in portable diagnostic equipment with battery-backed operation. IC Role / Device Role / Timing Role: Trusted boot source with 128-bit protection register for device identity and VPP-gated write enable preventing accidental corruption during low-power states. Use Value: Guarantees boot code immutability via hardware-enforced lockdown and factory-programmed ID block - satisfying 21 CFR Part 11 electronic record authenticity requirements. |
| Automotive Telematics Module | Smart Energy Meter Firmware |
Use Scenario: Hosting OTA-upgradable firmware and vehicle configuration profiles in cellular-connected telematics control units operating across -40°C to +105°C. IC Role / Device Role / Timing Role: High-reliability flash memory with 100,000-cycle endurance and CFI support for automatic driver adaptation to different flash vendors. Use Value: Ensures 15+ year field life under thermal cycling stress while enabling seamless migration between flash suppliers via standardized CFI interrogation - reducing supply chain risk. | Use Scenario: Storing tariff tables, encryption keys, and firmware in utility-grade smart meters deployed in harsh outdoor environments. IC Role / Device Role / Timing Role: Secure, long-life non-volatile storage with sector-lockdown for regulatory keys and RDY/BUSY-driven update sequencing. Use Value: Prevents unauthorized key modification via VPP voltage gating and provides deterministic erase timing (100 ms/sector) for meter firmware updates compliant with ANSI C12.22 security protocols. |
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 | 3.3 V only (no 2.65 V min), 70 ns access, 32 Mbit x16, TSOP-48, but lacks CFI and suspend/resume features. | Requires fixed 3.3 V supply; no background operation capability limits real-time update use cases. | Choose when CFI and suspend are unnecessary and strict 3.3 V operation is guaranteed. |
| MX29LV320ETTI-70G | 3.0–3.6 V operation, 70 ns access, 32 Mbit x16, TSOP-48, includes CFI but no program/erase suspend functionality. | Supports auto-configuration via CFI but cannot interrupt erase to service real-time reads - unsuitable for time-constrained update scenarios. | Prefer when CFI compatibility is essential but suspend is not required, and VPP-free write enable is acceptable. |
Compared with SST39VF3201C-70-4C-EKE and MX29LV320ETTI-70G, the AT49BV322D-70TU uniquely combines wide-voltage operation (2.65–3.6 V), CFI support, and full suspend/resume - making it the only option among the three qualified for battery-powered, real-time, and multi-vendor-compatible embedded firmware storage.
Availability
AT49BV322D-70TU is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, automotive telematics, and smart energy metering requiring stable component supply across extended product lifecycles.
Supply support for AT49BV322D-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 legacy Atmel Flash products including the AT49BV322D-70TU under its broad portfolio of reliable, long-lifecycle semiconductor solutions.
The AT49BV322D-70TU belongs to Atmel's parallel-interface Flash memory family, engineered for robust in-system programmability in resource-constrained embedded systems where deterministic timing, sector-level protection, and voltage-flexible operation are mandatory.
FAQ
What is the operating voltage range for the AT49BV322D-70TU?
The AT49BV322D-70TU operates from 2.65 V to 3.6 V for both read and write functions. This wide single-supply range allows direct interfacing with 3.3 V systems and tolerance for brownout conditions down to 2.65 V, ensuring reliable operation in battery-backed or marginally regulated environments. The AT49BV322D-70TU does not require separate VPP or VCC voltages beyond this range.
Does the AT49BV322D-70TU support both 8-bit and 16-bit data bus configurations?
Yes, the AT49BV322D-70TU supports both configurations via the BYTE pin: logic high selects x16 mode (I/O0–I/O15 active), logic low selects x8 mode (I/O0–I/O7 active, with I/O15 repurposed as A-1). This dual-mode capability allows the same AT49BV322D-70TU to serve 8-bit microcontrollers and 16-bit DSPs without redesigning the PCB layout or changing firmware drivers.
How does the AT49BV322D-70TU handle write protection?
The AT49BV322D-70TU implements three-tiered write protection: (1) VPP pin voltage thresholding (<0.4 V disables writes), (2) software-controlled sector lockdown (permanent per-sector read-only lock), and (3) hardware data protection (VCC sense, 10 ms power-on delay). These layers ensure that the AT49BV322D-70TU remains immune to accidental or malicious corruption during power transitions or firmware errors.
What is the purpose of the RDY/BUSY pin on the AT49BV322D-70TU?
The RDY/BUSY pin on the AT49BV322D-70TU is an open-drain output that actively pulls low during internal erase or program operations and releases (goes high-impedance) upon completion. Its wired-OR capability allows multiple AT49BV322D-70TU devices to share a single system status line, simplifying interrupt-driven firmware update coordination in multi-flash architectures.
Can the AT49BV322D-70TU be used in new designs despite the "Not Recommended for New Design" note?
Although the original Atmel datasheet carries a "Not Recommended for New Design" notice due to product sunset, the AT49BV322D-70TU remains actively stocked and supported by Microchip Technology with confirmed availability through 2027. Aetrix Electronics guarantees full lifecycle management for the AT49BV322D-70TU, including obsolescence notifications, last-time-buy planning, and cross-reference guidance - making it viable for new industrial and medical designs with 10+ year horizon requirements.
AT49BV322D-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:
- 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
AT49BV322D-70TU FAQ
1.How can I place an order for AT49BV322D-70TU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV322D-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 AT49BV322D-70TU reliable?
The price and inventory of AT49BV322D-70TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV322D-70TU is usually 5 days.
3.What payment methods are accepted for AT49BV322D-70TU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV322D-70TU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV322D-70TU?
AT49BV322D-70TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV322D-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 AT49BV322D-70TU?
For technical support, including AT49BV322D-70TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV322D-70TU requirements.
6.How does Aetrix verify that AT49BV322D-70TU is sourced from the original manufacturer or authorized distributors?
All AT49BV322D-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 AT49BV322D-70TU meets industry standards.
7.What is the process for return or replacement of AT49BV322D-70TU?
All AT49BV322D-70TU units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV322D-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 AT49BV322D-70TU part is unused and in its original packaging.
Return procedure for AT49BV322D-70TU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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