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Microchip Technology AT49BV322D-70CU
- Part No.:
- AT49BV322D-70CU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFBGA, CSPBGA
- Datasheet:
-
AT49BV322D-70CU.pdf
- Description:
- IC FLASH 32MBIT PARALLEL 48CBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,067
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Product details
Overview
AT49BV322D-70CU 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 support for in-system programming. It operates from 2.65V to 3.6V, features suspend/resume for concurrent read/program during erase, and is used in embedded boot code storage and firmware update applications.
For engineers reviewing the AT49BV322D-70CU datasheet, AT49BV322D-70CU pinout, AT49BV322D-70CU application, or AT49BV322D-70CU equivalent, key selection considerations include TSOP-48 package compatibility, 71-sector lockable architecture, CFI compliance, VPP-controlled write acceleration, and byte/word mode configuration via BYTE pin.
Technical Context
The AT49BV322D-70CU implements a command-register-based Flash architecture with dual-mode data interface (x8/x16), enabling flexible bus integration. Its internal write state machine supports chip/sector erase, byte/word programming, and dual-word accelerated programming at VPP = 9.5 V.
It integrates hardware data protection (VCC sense, power-on delay, VPP threshold), four status detection methods (RDY/BUSY, Data Polling on I/O7, Toggle Bit on I/O6, and dedicated I/O2–I/O7 status bits), and a programmable configuration register that determines post-operation read-mode recovery behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (2,097,152 words × 16 bits or 4,194,304 bytes × 8 bits) |
| Access Time | 70 ns - defines maximum read latency under worst-case VCC and temperature conditions |
| Supply Voltage | 2.65 V to 3.6 V - enables direct connection to 3.3 V logic without level shifting |
| Sector Architecture | 71 sectors: 63 × 64 KB + 8 × 8 KB - allows granular firmware partitioning and selective update |
| Program Time | 10 µs per word - enables high-throughput firmware patching in production or field |
| Erase Time | 100 ms per sector - balances speed and reliability for field-upgradable systems |
| Endurance | 100,000 erase cycles - qualifies for long-life industrial control and telecom applications |
| CFI Support | Yes - enables automatic driver initialization and multi-vendor flash abstraction in BIOS/bootloader |
Pinout & Package
AT49BV322D-70CU is available in a 48-lead TSOP-I (Thin Small Outline Package) with standard JEDEC MO-142AC footprint. Pin functions are identical between TSOP and CBGA variants per datasheet revision 3582B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A20 | Address Inputs | 21-bit address bus supporting full 2M-word addressing in x16 mode; A-1 alias on I/O15 in x8 mode |
| I/O0–I/O15 | Data I/O (x16) / I/O0–I/O7 + I/O15(A-1) (x8) | Configurable 8- or 16-bit data path; BYTE pin selects mode; I/O15 serves as LSB address in byte mode |
| CE, OE, WE | Chip Enable, Output Enable, Write Enable | Three independent controls prevent bus contention; standard microprocessor timing compatible |
| RESET | Hardware Initialization Input | Forces device into read/standby mode; required to exit suspend states or recover from failed operations |
| RDY/BUSY | Open-drain Status Output | Active-low signal indicates active program/erase; supports wired-OR of multiple devices on shared bus |
| VPP | Write Protection & Acceleration Control | Below 0.4 V: disables all writes; ≥1.65 V: enables normal operation; 9.5 V: enables dual-word programming |
| BYTE | Data 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) |
| NC | No Connect | Unbonded pin; must be left floating or tied to GND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Sector Erase Lockout | Individual write-protection per sector enables secure boot code retention while updating application firmware |
| Erase/Program Suspend | Allows real-time reading from non-suspending sectors during background erase/program - critical for deterministic response in RTOS environments |
| 128-bit Protection Register | Factory-programmed 64-bit block + user-programmable/lockable 64-bit block for anti-cloning and secure key storage |
| Common Flash Interface (CFI) | Standardized query table at fixed addresses enables OS-agnostic flash drivers and eliminates hard-coded timing assumptions |
| Single-Pulse Program Mode | Reduces software overhead by replacing multi-cycle command sequences with single WE pulses after six-byte entry code |
| Hardware Data Protection | VCC sense, 10 ms power-on delay, and VPP threshold enforcement prevent spurious writes during power ramp or noise events |
Applications
| Industrial PLC Firmware Storage | Automotive ECU Boot Memory |
|---|---|
Use Scenario: Storing and updating ladder logic and motion control algorithms in programmable logic controllers with field serviceability. IC Role / Device Role / Timing Role: Nonvolatile boot and application code storage with sector lockdown protecting bootloader integrity. Use Value: Enables safe over-the-air updates without risking corruption of critical startup routines due to 71-sector granularity and suspend/resume capability. | Use Scenario: Holding calibrated sensor parameters and diagnostic firmware in engine control units requiring ASIL-B alignment. IC Role / Device Role / Timing Role: CFI-compliant Flash memory providing deterministic 70 ns read access for real-time calibration lookup tables. Use Value: Supports secure reprogramming via JTAG or CAN bootloader using VPP-controlled write acceleration and 100,000-cycle endurance. |
| Network Router Boot Image | Medical Device Configuration Storage |
Use Scenario: Hosting primary and fallback boot images in enterprise-grade routers with fail-safe recovery. IC Role / Device Role / Timing Role: Dual-image Flash with sector lockdown isolating primary and backup partitions. Use Value: Guarantees atomic firmware swaps using chip erase and RDY/BUSY signaling - no partial-write risk during power loss. | Use Scenario: Retaining FDA-mandated device calibration coefficients and usage logs in portable diagnostic equipment. IC Role / Device Role / Timing Role: Tamper-resistant storage with 128-bit protection register for cryptographic keys and audit trails. Use Value: Meets IEC 62304 data integrity requirements via hardware-enforced write lockout and sector-level erase verification. |
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, 48-pin TSOP, no VPP pin, no CFI support | Lacks suspend/resume and sector lockdown; requires external write protection logic | Choose when CFI and secure sector locking are not required and supply is stable 3.3 V |
| MX29LV320ETTI-70G | 3.0–3.6 V, 70 ns, 48-pin TSOP, CFI compliant, but no VPP pin and no suspend/resume feature | Supports boot-block architecture but lacks real-time read-during-erase capability | Prefer when boot code partitioning suffices and concurrent read/program during erase is unnecessary |
Compared with SST39VF3201C-70-4C-EKE and MX29LV320ETTI-70G, the AT49BV322D-70CU uniquely combines VPP-enabled accelerated programming, hardware suspend/resume, and factory-programmed 128-bit security - making it suitable for safety-critical or field-upgradable systems where firmware integrity and real-time responsiveness are mandatory.
Availability
AT49BV322D-70CU is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive ECU boot memory, network router boot image hosting, and medical device configuration storage requiring stable component supply across extended product lifecycles.
Supply support for AT49BV322D-70CU 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 support for legacy Atmel Flash products including the AT49BV322D-70CU.
The AT49BV322D-70CU belongs to Atmel's parallel-interface Flash memory product line, designed specifically for embedded systems requiring reliable in-system programmability, sector-level security, and deterministic timing in resource-constrained environments.
FAQ
What is the operating voltage range for the AT49BV322D-70CU?
The AT49BV322D-70CU operates from 2.65 V to 3.6 V. This single-supply range eliminates need for separate VCC and VPP regulators in most designs. Operation below 2.65 V disables programming and erasing functions via internal VCC sense circuitry, ensuring data integrity during brown-out conditions. The AT49BV322D-70CU remains readable down to 2.65 V with guaranteed 70 ns access time.
Does the AT49BV322D-70CU support both byte and word data interfaces?
Yes, the AT49BV322D-70CU supports configurable x8 or x16 data bus width via the BYTE pin. When BYTE = HIGH, I/O0–I/O15 operate as a 16-bit data bus; when BYTE = LOW, I/O0–I/O7 function as an 8-bit bus and I/O15 becomes A-1 (LSB address input). This flexibility allows seamless integration with 8-bit microcontrollers or 16-bit DSPs without external glue logic. The AT49BV322D-70CU's internal address decoding adapts automatically.
How does sector lockdown work on the AT49BV322D-70CU?
Sector lockdown on the AT49BV322D-70CU is enabled per sector using a six-bus-cycle command. Once locked, a sector becomes permanently read-only until the next power cycle or RESET assertion. Lockdown prevents accidental erasure or reprogramming of boot code or calibration data. The AT49BV322D-70CU provides software detection via Product ID mode reads at address 00002H within each sector to verify lockdown status before attempting writes.
What status monitoring methods does the AT49BV322D-70CU provide for program/erase completion?
The AT49BV322D-70CU offers four independent status monitoring methods: (1) RDY/BUSY pin (open-drain active-low), (2) Data Polling on I/O7, (3) Toggle Bit on I/O6, and (4) dedicated status bits on I/O2–I/O7. These can be used individually or in combination per system requirements. The AT49BV322D-70CU's configuration register determines whether status polling returns device to read mode automatically or requires explicit Product ID Exit command.
Is the AT49BV322D-70CU pin-compatible with other 48-pin TSOP Flash memories?
The AT49BV322D-70CU uses standard JEDEC MO-142AC 48-pin TSOP-I pinout and shares identical signal names (A0–A20, I/O0–I/O15, CE/OE/WE, RESET, RDY/BUSY, VPP, BYTE) with industry-standard parallel Flash devices. However, functional compatibility requires verification of command set, timing parameters, and feature support (e.g., suspend/resume, CFI, VPP behavior). The AT49BV322D-70CU is not a drop-in replacement for non-Atmel parts without firmware adaptation.
AT49BV322D-70CU 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:
- 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-CBGA (6x8)
AT49BV322D-70CU FAQ
1.How can I place an order for AT49BV322D-70CU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV322D-70CU 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-70CU reliable?
The price and inventory of AT49BV322D-70CU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV322D-70CU is usually 5 days.
3.What payment methods are accepted for AT49BV322D-70CU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV322D-70CU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV322D-70CU?
AT49BV322D-70CU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV322D-70CU 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-70CU?
For technical support, including AT49BV322D-70CU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV322D-70CU requirements.
6.How does Aetrix verify that AT49BV322D-70CU is sourced from the original manufacturer or authorized distributors?
All AT49BV322D-70CU 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-70CU meets industry standards.
7.What is the process for return or replacement of AT49BV322D-70CU?
All AT49BV322D-70CU units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV322D-70CU, 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-70CU part is unused and in its original packaging.
Return procedure for AT49BV322D-70CU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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