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Microchip Technology AT49BV322D-70TU-T
- Part No.:
- AT49BV322D-70TU-T
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49BV322D-70TU-T.pdf
- Description:
- IC FLASH 32MBIT PARALLEL 48TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,826
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Product details
Overview
AT49BV322D-70TU-T 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 sectors, and features suspend/resume for concurrent read/program during erase - enabling real-time firmware updates in industrial controllers.
For engineers reviewing the AT49BV322D-70TU-T datasheet, AT49BV322D-70TU-T pinout, AT49BV322D-70TU-T application, or AT49BV322D-70TU-T equivalent, key selection criteria include its TSOP-48 package, dual-mode (x8/x16) data interface via BYTE pin, CFI compliance for auto-configuration, 100,000 erase cycles, and hardware write protection via VPP and sector lockdown.
Technical Context
This parallel-interface NOR Flash implements a command-register architecture with six-byte unlock sequences for erase, program, and lockdown operations. Its internal state machine handles timing-critical functions including chip/sector erase (max 100 ms), word programming (10 µs), and suspend/resume control - all without external clocks.
The device integrates multiple status detection methods: READY/BUSY open-drain output, Data Polling on I/O7, Toggle Bit on I/O6, and dedicated status bits on I/O3 (VPP level), I/O5 (erase/program failure), and I/O2 - configurable via a nonvolatile status bit register set to "00" (auto-return to read mode) or "01" (manual Product ID Exit required).
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 boot code and application firmware in resource-constrained MCUs. |
| Access Time | 70 ns - enables direct execution (XIP) from Flash in systems with ≤14 MHz bus timing. |
| Erase Architecture | 71 sectors: 63 × 64 KB + 8 × 8 KB - allows granular firmware partitioning (e.g., bootloader + app + config) with independent lockout. |
| Program Time | 10 µs per word - reduces field update latency; accelerated dual-word programming available at VPP = 9.5 V. |
| End-of-Operation Detection | RDY/BUSY pin + Data Polling (I/O7) + Toggle Bit (I/O6) - provides hardware- and software-synchronized completion signaling. |
| Write Protection | VPP pin (0–0.4 V inhibits programming; ≥1.65 V enables; 10 V accelerates) + sector lockdown + 128-bit user-programmable protection register - prevents accidental corruption in deployed systems. |
| Endurance & Retention | ≥100,000 erase cycles; 20-year data retention - suitable for industrial equipment with multi-year service life. |
Pinout & Package
AT49BV322D-70TU-T is packaged in a 48-lead Thin Small Outline Package (TSOP Type I, 12 mm × 20 mm, 0.5 mm pitch), pin-compatible with industry-standard x16 Flash sockets. Pin functions are electrically identical between TSOP and CBGA variants; this part uses TSOP.
| 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. |
| I/O0–I/O15 / I/O15(A-1) | Data I/O / LSB Address | x16 mode: bidirectional data bus I/O0–I/O15; x8 mode: I/O0–I/O7 active, I/O15 repurposed as A-1 for byte-aligned addressing. |
| CE, OE, WE | Chip/Output/Write Enable | Three independent controls prevent bus contention; CE+OE low + WE high enables read; CE+WE low + OE high initiates write/erase commands. |
| BYTE | Interface Mode Select | Logic high = x16 word mode (I/O0–I/O15 active); logic low = x8 byte mode (I/O0–I/O7 active, I/O8–I/O14 tri-stated). |
| VPP | Write Voltage Control | Enables/disables programming/erase: <0.4 V = locked; ≥1.65 V = standard operation; 10 V = accelerated dual-word program. |
| RESET | Hardware Initialization | Pulling low halts ongoing operations and forces high-impedance outputs; release returns device to read/standby based on CE/OE states. |
| RDY/BUSY | Open-Drain Status Output | Actively pulled low during internal program/erase; released high at completion - supports wired-OR of multiple devices on shared status line. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Erase Suspend/Resume | Interrupts active sector erase to read/program other sectors - enables background firmware patching without halting system operation. |
| Program Suspend/Resume | Pauses active word programming to read any non-target sector - supports real-time diagnostics during code updates. |
| Common Flash Interface (CFI) | Standardized query table accessible via 98h command at address 55h - allows bootloader to auto-detect geometry, timing, and command sets without hardcoding. |
| 128-bit Protection Register | Factory-programmed 64-bit block A + user-writable/lockable 64-bit block B - secures cryptographic keys or calibration data against overwrite. |
| Hardware Data Protection | VCC sense (<1.8 V inhibits program), 10 ms power-on delay, and VPP-level monitoring (I/O3 status bit) - prevents corruption during brown-out or unstable supply conditions. |
Applications
| Industrial PLC Firmware Storage | Automotive ECU Bootloader |
|---|---|
|
Use Scenario: Storing and updating ladder logic programs and I/O configuration tables in programmable logic controllers operating in harsh factory environments. IC Role / Device Role / Timing Role: Nonvolatile code storage with sector lockdown protecting bootloader and safety-critical routines while allowing field-upgradable application logic. Use Value: 70 ns access time enables deterministic scan-cycle execution; 100,000 erase cycles support >10 years of scheduled firmware revisions. |
Use Scenario: Hosting secure boot code and calibration maps in engine control units requiring ISO 26262-compliant update mechanisms. IC Role / Device Role / Timing Role: Trusted code repository with 128-bit protection register for asymmetric keys and sector lockdown for ASIL-B critical boot firmware. Use Value: VPP-based hardware write protection and CFI auto-configuration ensure safe, verified reprogramming during dealership service events. |
| Medical Device Configuration Memory | Networking Equipment Image Storage |
|
Use Scenario: Retaining device-specific calibration parameters, usage logs, and regulatory compliance settings in portable diagnostic instruments. IC Role / Device Role / Timing Role: Field-updatable parameter store using suspend/resume to maintain real-time sensor acquisition during configuration writes. Use Value: Low 15 µA standby current extends battery life; RDY/BUSY and Data Polling enable precise timing of write commits in safety-critical workflows. |
Use Scenario: Holding primary and fallback firmware images in enterprise switches and routers requiring zero-downtime upgrades. IC Role / Device Role / Timing Role: Dual-image storage with independent sector locking - one image active while the other is erased/programmed in background. Use Value: 10 µs word program time minimizes upgrade window; 71-sector granularity allows atomic image swaps without full-chip erase delays. |
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; no VPP pin; uses Write Protect (WP#) instead of VPP for hardware lock; lacks CFI support. | Requires external WP# signal routing; no auto-configuration - firmware must be hardcoded to device timing and command set. | Choose when VPP complexity is undesirable and CFI is not needed; verify WP# timing compatibility with host controller. |
| MX29LV320ETTI-70G | 32 Mbit, 70 ns, 2.7–3.6 V; includes CFI and VPP; but only 10,000 erase cycles and no sector suspend/resume capability. | Cannot perform concurrent read/program during erase - requires full system stall during firmware updates. | Choose for cost-sensitive designs where update concurrency is unnecessary and lower endurance is acceptable. |
Compared with SST39VF3201C-70-4C-EKE and MX29LV320ETTI-70G, the AT49BV322D-70TU-T uniquely combines CFI auto-configuration, hardware VPP-based write acceleration, and true suspend/resume - making it optimal for systems requiring robust, field-upgradable firmware with minimal host intervention.
Availability
AT49BV322D-70TU-T is available at Aetrix Electronics and suitable for industrial PLCs, automotive ECUs, medical diagnostics, and networking equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for AT49BV322D-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 legacy Flash product lines with full documentation, longevity commitments, and qualified manufacturing.
The AT49BV322D-70TU-T belongs to Atmel's parallel NOR Flash family, engineered for reliable in-system programming in mission-critical embedded systems where data integrity, security, and update flexibility are mandatory.
FAQ
What is the correct power-up sequence for AT49BV322D-70TU-T to ensure reliable initialization?
The AT49BV322D-70TU-T powers on in read mode if VCC reaches its valid range (2.65–3.6 V) before RESET is deasserted. To guarantee known state, apply VCC first, wait ≥100 µs for stabilization, then assert RESET low for ≥500 ns before releasing. This ensures internal registers reset cleanly and avoids spurious command latching during voltage ramp-up. The AT49BV322D-70TU-T does not require VPP sequencing at power-up unless immediate programming is intended.
How does the BYTE pin affect address decoding and data bus width in AT49BV322D-70TU-T?
When BYTE = 1, AT49BV322D-70TU-T operates in x16 mode: A0–A20 address 2M words, and I/O0–I/O15 carry full 16-bit data. When BYTE = 0, it enters x8 mode: A0–A20 + A-1 (via I/O15) address 4M bytes, and only I/O0–I/O7 are active - I/O8–I/O14 are tri-stated. This mode change alters the effective address space and requires host software to adjust pointer arithmetic and bus-width handling accordingly for the AT49BV322D-70TU-T.
Can AT49BV322D-70TU-T be used in systems with 5 V tolerant I/Os?
No - while AT49BV322D-70TU-T control inputs (CE, OE, WE, RESET, BYTE, VPP) tolerate up to 5.5 V, its I/O pins are strictly 3.3 V-tolerant (0 to VCC + 0.6 V). Driving I/O0–I/O15 above 3.96 V (at VCC = 3.36 V max) risks latch-up or permanent damage. Level-shifting is mandatory when interfacing with 5 V microcontrollers; the AT49BV322D-70TU-T itself must operate within its 2.65–3.6 V supply range.
What happens if a Sector Lockdown command is issued to an already locked sector in AT49BV322D-70TU-T?
Issuing a Sector Lockdown command to an already locked sector has no effect - the AT49BV322D-70TU-T ignores redundant lockdown attempts. Locked sectors remain read-only until a hardware RESET or power cycle, after which they may be erased and reprogrammed. Software can verify lockdown status by entering Product ID mode and reading address 00002H within the target sector: I/O0 = 1 indicates lockdown is active, confirming the AT49BV322D-70TU-T sector is protected.
Is the AT49BV322D-70TU-T compatible with JEDEC-standard Flash command sets?
The AT49BV322D-70TU-T implements a proprietary command set (e.g., 555h/AAh unlock sequence) rather than JEDEC JESD21-C. However, it fully complies with the Common Flash Interface (CFI) specification (JEDEC JESD68-A), allowing standardized interrogation of geometry, timing, and supported commands. Host firmware must use CFI query mode (98h at 55h) to discover AT49BV322D-70TU-T capabilities rather than assuming JEDEC command compatibility.
AT49BV322D-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
AT49BV322D-70TU-T FAQ
1.How can I place an order for AT49BV322D-70TU-T through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV322D-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 AT49BV322D-70TU-T reliable?
The price and inventory of AT49BV322D-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 AT49BV322D-70TU-T is usually 5 days.
3.What payment methods are accepted for AT49BV322D-70TU-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV322D-70TU-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV322D-70TU-T?
AT49BV322D-70TU-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV322D-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 AT49BV322D-70TU-T?
For technical support, including AT49BV322D-70TU-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV322D-70TU-T requirements.
6.How does Aetrix verify that AT49BV322D-70TU-T is sourced from the original manufacturer or authorized distributors?
All AT49BV322D-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 AT49BV322D-70TU-T meets industry standards.
7.What is the process for return or replacement of AT49BV322D-70TU-T?
All AT49BV322D-70TU-T units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV322D-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 AT49BV322D-70TU-T part is unused and in its original packaging.
Return procedure for AT49BV322D-70TU-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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