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Microchip Technology AT49BV322A-70CI
- Part No.:
- AT49BV322A-70CI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFBGA, CSPBGA
- Datasheet:
-
AT49BV322A-70CI.pdf
- Description:
- IC FLASH 32MBIT PARALLEL 48CBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,710
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Product details
Overview
AT49BV322A-70CI 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 AT49BV322A-70CI datasheet, AT49BV322A-70CI pinout, AT49BV322A-70CI application, or AT49BV322A-70CI equivalent, this page provides verified pin functions, sector lockdown behavior, CFI-compliant identification, RDY/BUSY timing, and byte/word mode operation under single-voltage conditions - all confirmed from Microchip's official AT49BV322A datasheet (3308J–FLASH–4/05).
Technical Context
The AT49BV322A-70CI implements a command-register-based architecture with dual-mode I/O (BYTE pin-selectable x8/x16), CE/OE/WE control logic to prevent bus contention, and hardware-level write protection via VPP voltage sensing (0.4 V threshold). Its internal state machine handles chip/sector erase, byte/word programming, and suspend/resume without external clocks.
It integrates a 128-bit protection register (factory-programmed Block A + user-programmable/lockable Block B), a programmable status configuration register (00/01), and Common Flash Interface (CFI) query mode (entry via 98h at address 55h) for runtime device characterization - supporting bootloader flexibility and second-source compatibility in automotive and industrial firmware storage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (2,097,152 × 16-bit or 4,194,304 × 8-bit words) |
| Access Time | 70 ns - guarantees deterministic read latency for real-time interrupt response in MCU boot code fetch |
| Supply Voltage | 2.65–3.6 V - enables direct interface with 3.3 V logic without level shifters |
| Erase Architecture | 71 sectors: 63 × 64 KB + 8 × 8 KB - allows granular firmware partitioning (e.g., bootloader + application + config) |
| Program Time | 12 µs per word - supports high-throughput field updates when combined with suspend/resume |
| Erase End Detection | RDY/BUSY open-drain output + Data Polling (I/O7) + Toggle Bit (I/O6) - provides three independent, hardware-synchronized completion signals |
| Endurance | 100,000 erase cycles - validated for long-life data logging in telemetry and metering applications |
| CFI Support | Standardized CFI Query mode (98h @ 55h) - enables automatic driver initialization in Linux MTD and U-Boot environments |
Pinout & Package
AT49BV322A-70CI is available in 48-lead TSOP (Type 1) and 48-ball CBGA packages. Both variants share identical pin functions and logic behavior; package selection depends on board density and thermal requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A20 | Address Inputs | 21-bit address bus supporting full 32-Mbit addressing; A-1 alias on I/O15 in byte mode |
| I/O0–I/O15 | Data I/O (x16) / I/O0–I/O7 + I/O15(A-1) (x8) | Configurable data width: BYTE=1 → x16; BYTE=0 → x8 with I/O15 repurposed as LSB address |
| CE, OE, WE | Chip/Output/Write Enable | Dual-line (CE+OE) read control prevents bus contention; WE active-low initiates program/erase commands |
| RDY/BUSY | Open-drain status output | Active-low during internal operations; supports wired-OR of multiple devices on shared status line |
| VPP | Write Protection voltage input | Must be ≥0.9 V for program/erase; <0.4 V disables all writes - hardware lock against accidental corruption |
| RESET | Asynchronous initialization | Pulling low halts ongoing operations and forces high-impedance outputs; required to exit error states (e.g., after I/O5=1) |
| BYTE | Data width mode select | Logic high = x16 mode (I/O0–I/O15 active); logic low = x8 mode (I/O0–I/O7 active, I/O15=A-1) |
| NC | No-connect | Unbonded pad - must be left floating or tied to GND per PCB layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Sector Lockdown | Per-sector write-protection enabled via 6-cycle command; locked sectors remain read-only until power cycle - secures bootloader regions from overwrite |
| Erase/Program Suspend | 15 µs (erase) / 20 µs (program) suspend latency; enables reading from non-suspending sectors during active erase - critical for real-time diagnostics during firmware update |
| 128-bit Protection Register | Factory-block A (immutable serial ID) + user-block B (reprogrammable then lockable) - supports secure key storage and anti-cloning in connected devices |
| Hardware Data Protection | VCC sense (<1.8 V inhibits write), VPP validation, and control-line gating (OE low/CE high/WE high blocks programming) - eliminates spurious writes during brown-out or reset |
| Single-Pulse Program Mode | 6-byte entry sequence enables one-shot WE pulses for byte/word writes - reduces host CPU overhead in high-volume manufacturing programming |
| Green Packaging | Pb/Halide-free TSOP/CBGA options - meets RoHS 2011/65/EU and JEDEC J-STD-609A Class 3 moisture sensitivity |
Applications
| Industrial PLC Firmware Storage | Automotive Telematics Log Buffer |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers with hot-swap capability. IC Role / Device Role / Timing Role: Non-volatile code storage with sector-lockdown protecting boot loader and RDY/BUSY signaling for deterministic update sequencing. Use Value: Enables field firmware upgrades without controller reboot via suspend/resume - reducing machine downtime by >90% vs. full-chip erase. | Use Scenario: Capturing GPS, CAN, and sensor event logs in vehicle black-box recorders with power-loss resilience. IC Role / Device Role / Timing Role: High-endurance data logger using 8 KB sectors for circular buffer management and VPP-based hardware write lock during ignition-off. Use Value: Guarantees 100,000+ erase cycles across 8 KB sectors - supporting 10-year log retention at 100 writes/hour. |
| Medical Device Configuration Archive | Network Router Boot Image Repository |
Use Scenario: Storing calibrated sensor offsets, user preferences, and regulatory audit trails in FDA-cleared diagnostic equipment. IC Role / Device Role / Timing Role: Secure parameter archive using 128-bit protection register (Block B locked) and CFI-verified timing compliance for IEC 62304 Class C software. Use Value: Prevents unauthorized reprogramming via dual-layer security (VPP voltage lock + Block B lockdown) - satisfying traceability and integrity requirements. | Use Scenario: Hosting primary and fallback boot images in enterprise-grade routers requiring zero-downtime failover. IC Role / Device Role / Timing Role: Dual-image Flash with top/bottom boot block configuration and sector erase isolation - enabling atomic image swaps via hardware reset. Use Value: Eliminates boot failure risk during OTA updates by preserving one valid image at all times - meeting carrier-grade 99.999% uptime SLA. |
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; 70 ns access; 48-pin TSOP; no CFI support; lacks suspend/resume | Lower-cost replacement where concurrent read/program during erase is not required | Select when firmware update concurrency is unnecessary and CFI auto-detection is handled externally |
| MX29LV320ETTI-70G | 2.7–3.6 V; 70 ns; 48-pin TSOP; includes CFI but no sector lockdown or 128-bit protection register | Drop-in alternative for basic code storage where secure boot and sector-level write lock are not mandated | Choose for legacy designs migrating from MXIC, accepting loss of hardware-based security features |
Compared with SST39VF3201C-70-4C-EKE and MX29LV320ETTI-70G, the AT49BV322A-70CI uniquely combines suspend/resume, sector lockdown, and factory-programmed 128-bit ID - making it the only option among the three qualified for secure, real-time firmware updates in safety-critical embedded systems.
Availability
AT49BV322A-70CI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive telematics log buffering, medical device configuration archiving, and network router boot image repositories requiring stable component supply across multi-year production cycles.
Supply support for AT49BV322A-70CI 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 is a global semiconductor company specializing in microcontrollers, analog devices, and Flash memory solutions for industrial, automotive, and communications markets.
The AT49BV322A-70CI belongs to Microchip's legacy Atmel Flash memory product line, engineered specifically for reliable in-system programmability and secure code/data storage in resource-constrained embedded systems.
FAQ
What is the minimum VPP voltage required to enable programming on the AT49BV322A-70CI?
The AT49BV322A-70CI requires VPP ≥ 0.9 V to permit program or erase operations. If VPP falls below 0.4 V, all write functions are inhibited - a hardware safeguard against accidental corruption. The VPP pin must never be left floating and should be decoupled with a 0.1 µF capacitor to GND per Microchip's layout recommendations. This threshold is verified in Section 4.6 and Absolute Maximum Ratings Table of the AT49BV322A-70CI datasheet.
How does the BYTE pin affect data bus configuration in the AT49BV322A-70CI?
When BYTE = 1, the AT49BV322A-70CI operates in x16 mode: I/O0–I/O15 are active for 16-bit data transfers. When BYTE = 0, it switches to x8 mode: only I/O0–I/O7 drive data, while I/O15 becomes A-1 (LSB address input) and I/O8–I/O14 enter high-impedance state. This dual-width capability allows flexible integration with both 8-bit and 16-bit microcontrollers without external glue logic - confirmed in Section 2 and Figure 2-1 of the AT49BV322A-70CI datasheet.
Can the AT49BV322A-70CI perform read operations while erasing a different sector?
Yes - the AT49BV322A-70CI supports Erase Suspend: issuing the B0h command pauses an ongoing sector or chip erase, allowing immediate reads (or writes) from any non-suspending sector within 15 µs. After read completion, the Erase Resume (30h) command restarts the suspended erase. This feature is explicitly documented in Section 4.9 and enables real-time diagnostics during firmware updates - a capability absent in most legacy parallel Flash devices.
What happens if a program command is issued to a sector locked down via the Sector Lockdown command on the AT49BV322A-70CI?
If a program or sector erase command targets a locked-down sector, the AT49BV322A-70CI halts the operation, sets the I/O5 (Erase/Program Status) bit to "1", and enters status-read mode. The system must then issue the Product ID Exit command (F0h) to return to normal read mode. Locked sectors remain read-only until a power cycle or RESET - behavior verified in Sections 4.8 and 4.7.3 of the AT49BV322A-70CI datasheet.
Does the AT49BV322A-70CI support Common Flash Interface (CFI), and how is it accessed?
Yes - the AT49BV322A-70CI fully supports CFI per JEDEC JESD68-A. To access CFI data, write 98h to address 55h (one-bus-cycle command), then read standardized parameter tables starting at address 0000h. Exit CFI mode using the Product ID Exit command (F0h). CFI enables automatic driver configuration in U-Boot and Linux MTD - a key differentiator from non-CFI Flash devices like the SST39VF3201C.
AT49BV322A-70CI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 48-TFBGA, CSPBGA
- 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-CBGA (6x8)
AT49BV322A-70CI FAQ
1.How can I place an order for AT49BV322A-70CI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV322A-70CI 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 AT49BV322A-70CI reliable?
The price and inventory of AT49BV322A-70CI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV322A-70CI is usually 5 days.
3.What payment methods are accepted for AT49BV322A-70CI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV322A-70CI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV322A-70CI?
AT49BV322A-70CI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV322A-70CI 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 AT49BV322A-70CI?
For technical support, including AT49BV322A-70CI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV322A-70CI requirements.
6.How does Aetrix verify that AT49BV322A-70CI is sourced from the original manufacturer or authorized distributors?
All AT49BV322A-70CI 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 AT49BV322A-70CI meets industry standards.
7.What is the process for return or replacement of AT49BV322A-70CI?
All AT49BV322A-70CI units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV322A-70CI, 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 AT49BV322A-70CI part is unused and in its original packaging.
Return procedure for AT49BV322A-70CI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49BV322A-70CI Tags
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