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Microchip Technology AT49BV320D-70TU
- Part No.:
- AT49BV320D-70TU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 48-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49BV320D-70TU.pdf
- Description:
- IC FLASH 32MBIT PARALLEL 48TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,441
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Product details
Overview
AT49BV320D-70TU from Microchip Technology (formerly Atmel) is a 32-Mbit (2M × 16) single-supply Flash memory IC operating at 2.65–3.6 V, featuring 70 ns access time, sector erase architecture with 71 independently lockable sectors, and suspend/resume capability for concurrent read/program during erase. It is used in embedded systems requiring in-system reprogramming, such as industrial controllers and legacy communication modules.
For engineers reviewing the AT49BV320D-70TU datasheet, AT49BV320D-70TU pinout, AT49BV320D-70TU application, or AT49BV320D-70TU equivalent, key selection considerations include TSOP-48 package compatibility, 128-bit protection register support, Common Flash Interface (CFI) compliance, flexible Softlock/Hardlock sector protection, and dual-word programming acceleration via VPP = 10.0 V.
Technical Context
The AT49BV320D-70TU implements a command-driven Write State Machine (WSM) that controls all non-read operations-including word program, sector erase, suspend/resume, and protection register access-via standardized bus-cycle command sequences. Its architecture supports simultaneous operation modes: while one sector erases, another may be read or programmed using Erase Suspend and Program Suspend commands.
It integrates hardware data protection (VCC sense, VPP monitoring, control-line inhibit), a 128-bit factory/user-programmable protection register (with locked Sector B), and CFI Query mode (entry via 98h command) to enable runtime flash configuration discovery. The device powers on in read mode and requires no external high-voltage generator due to internal charge pump and VPP-based acceleration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 32 Mbit (2,097,152 × 16-bit words); enables storage of firmware images up to ~4 MB in legacy 16-bit bus systems. |
| Access Time | 70 ns max; ensures compatibility with 14 MHz bus timing in microcontroller-based designs without wait states. |
| Supply Voltage | 2.65–3.6 V single supply; eliminates need for separate VCC/VPP rails in portable or low-power embedded applications. |
| Sector Architecture | 71 sectors: sixty-three 64 KB + eight 8 KB sectors; allows granular firmware partitioning (e.g., bootloader in protected 8 KB sectors, application in 64 KB blocks). |
| Program/Erase Endurance | ≥100,000 erase cycles per sector; supports field firmware updates over 10+ years in industrial control logging applications. |
| VPP Function | 10.0 V enables accelerated dual-word programming; required only during manufacturing, not field update, reducing system-level HV circuit complexity. |
| CFI Support | Compliant with JEDEC JESD68; allows host BIOS or bootloader to auto-detect geometry, timing, and command set without hard-coded driver assumptions. |
Pinout & Package
AT49BV320D-70TU is available in a 48-lead Thin Small Outline Package (TSOP Type I, 12 × 20 mm), pin-compatible with industry-standard 48-pin Flash footprints. Pin functions are electrically defined and validated per Atmel datasheet 3581D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A20 | Address Inputs | 21-bit address bus supporting full 2M-word addressing; A0–A19 used for standard word access, A20 selects upper half of memory map. |
| I/O0–I/O15 | Bidirectional Data Bus | 16-bit parallel interface; supports byte/word reads and writes; outputs enter high-Z when CE or OE is high to prevent bus contention. |
| CE, OE, WE | Chip/Output/Write Enable | Three independent control lines enable precise timing control and eliminate need for glue logic in 8086/68K-style bus interfaces. |
| VPP | Program/Erase Voltage Control | Enables or disables programming/erase: <0.4 V inhibits all writes; ≥1.65 V enables normal operation; 10.0 V enables dual-word programming. |
| WP | Hardware Sector Protection | Directly gates Hardlock functionality: WP = low locks Hardlocked sectors permanently until power cycle; WP = high allows software unlock. |
| RESET | Asynchronous Initialization | Forces device into read mode and clears WSM state; essential for safe recovery after power-up or watchdog reset in safety-critical systems. |
Key Features
| Feature | Design Value |
|---|---|
| Erase/Program Suspend | Allows real-time interrupt of erase or program to service urgent read requests from other sectors-critical for deterministic response in motor control firmware. |
| Flexible Sector Protection | Independent Softlock (software-unlockable) and Hardlock (WP-gated) per sector enables secure bootloader + field-upgradable application partitioning. |
| 128-bit Protection Register | Factory-programmed 64-bit ID + user-programmable 64-bit lockable sector B provides tamper-resistant device identity and secure key storage. |
| Common Flash Interface (CFI) | Standardized query table accessible at known offsets enables OS-agnostic flash drivers and simplifies migration across flash vendors. |
| Low-Power Operation | 10 mA active current and 15 µA standby current support battery-backed operation in remote sensor nodes with infrequent firmware updates. |
Applications
| Industrial PLC Firmware Storage | Legacy Telecom Line Card Boot Code |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers with no external programmer interface. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; 70 ns access meets real-time scan cycle timing budgets. Use Value: Sector locking prevents accidental overwrite of critical boot code while allowing field updates to application logic via unlocked 64 KB sectors. | Use Scenario: Hosting boot ROM and DSP firmware on TDM-based line cards where space-constrained PCBs require TSOP packaging. IC Role / Device Role / Timing Role: Primary boot memory mapped to CPU address space; CE/OE/WE timing aligns with Motorola 68360 bus cycles. Use Value: CFI support allows generic bootloader to auto-configure timing parameters, eliminating board-specific flash initialization code. |
| Medical Device Configuration Storage | Automotive Body Control Module Calibration Data |
Use Scenario: Retaining device-specific calibration tables and safety-critical configuration parameters across power cycles in diagnostic imaging equipment. IC Role / Device Role / Timing Role: Parameter storage with write-protection enforcement; 128-bit protection register stores unique device serial and cryptographic keys. Use Value: Hardlock + WP pin ensures calibration data remains immutable during routine software updates, satisfying IEC 62304 traceability requirements. | Use Scenario: Storing ECU calibration maps subject to OEM-defined update policies requiring sector-level write authorization. IC Role / Device Role / Timing Role: Field-updatable parameter memory; suspend/resume enables reading live sensor data while background calibration updates occur. Use Value: Dual-word programming at VPP = 10 V reduces flash update time by ~50% during dealer reflash procedures, improving service bay throughput. |
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 dual-word programming | Lacks VPP-accelerated programming and 128-bit protection register; CFI implementation differs in query table layout | Choose for cost-sensitive designs where VPP circuitry is undesirable and field update speed is non-critical. |
| MX29LV320ETTI-70G | 3.0–3.6 V, 70 ns, 48-pin TSOP, includes BOOT block flag but no 128-bit protection register or Hardlock/WP interaction | Supports top/bottom boot configuration but lacks WP-gated Hardlock; status register bit mapping differs (no SR6 ESS bit) | Prefer when boot-sector flexibility is primary requirement and security features like protection register are not mandated. |
Compared with SST39VF3201C-70-4C-EKE and MX29LV320ETTI-70G, the AT49BV320D-70TU uniquely combines VPP-accelerated programming, WP-controlled Hardlock, and factory/user-segmented 128-bit protection-making it suitable for applications demanding both field update performance and hardware-enforced data integrity.
Availability
AT49BV320D-70TU is available at Aetrix Electronics and suitable for industrial PLCs, legacy telecom infrastructure, medical diagnostics equipment, and automotive body control modules requiring stable component supply and long-term obsolescence management.
Supply support for AT49BV320D-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 full technical and supply chain support for legacy Atmel Flash products including the AT49BV320D-70TU.
The AT49BV320D-70TU belongs to Atmel's BV-series parallel-interface Flash memory family, designed specifically for in-system programmable code and data storage in resource-constrained 16-bit embedded systems with strict timing and security requirements.
FAQ
What is the minimum VPP voltage required to enable programming on the AT49BV320D-70TU?
The AT49BV320D-70TU requires VPP ≥ 1.65 V to enable normal program and erase operations. If VPP falls below 0.4 V, all write functions are inhibited. The device will not accept program or erase commands unless VPP is within this valid range, and the VPP status bit (SR3) will flag low-VPP conditions during operation. This ensures robust hardware-level write protection independent of software control.
Does the AT49BV320D-70TU support true 16-bit parallel data access?
Yes, the AT49BV320D-70TU supports full 16-bit bidirectional data transfer via I/O0–I/O15 pins. It is organized as 2,097,152 words of 16 bits each (32 Mbit total), and all command sequences-including word program, sector erase, and status register read-are defined for 16-bit bus operation. The device does not support byte-wide access modes or data masking; reads and writes must use the complete 16-bit path.
How does the WP pin interact with Hardlock protection on the AT49BV320D-70TU?
On the AT49BV320D-70TU, the WP pin directly gates Hardlock functionality: when WP is low, Hardlocked sectors become permanently read-only until power cycle or reset; when WP is high, Hardlock is overridden and sectors can be unlocked via software command. This dual-mode protection-combining hardware (WP) and software (Hardlock command)-enables secure, policy-driven firmware partitioning not available in standard Flash devices.
Can the AT49BV320D-70TU be used in a 5 V system environment?
No, the AT49BV320D-70TU is a 3 V-only device with absolute maximum input voltage of 5.5 V on control/address pins-but VCC must remain within 2.65–3.6 V. Driving CE, OE, or WE from a 5 V microcontroller is permissible only if level-shifted or buffered, as sustained 5 V on VCC would exceed ratings and damage the device. The I/O pins tolerate only up to VCCQ + 0.6 V, confirming strict 3 V operation.
What is the purpose of the 128-bit protection register in the AT49BV320D-70TU?
The 128-bit protection register in the AT49BV320D-70TU provides two distinct security zones: Sector A (64 bits, factory-programmed, unchangeable) stores a unique device identifier, while Sector B (64 bits, user-programmable and lockable) enables secure storage of keys or calibration data. Once Sector B is locked via the Lock Protection Register command, its contents cannot be altered-even by subsequent programming commands-ensuring persistent, tamper-resistant storage critical for regulatory compliance and anti-cloning.
AT49BV320D-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
AT49BV320D-70TU FAQ
1.How can I place an order for AT49BV320D-70TU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV320D-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 AT49BV320D-70TU reliable?
The price and inventory of AT49BV320D-70TU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV320D-70TU is usually 5 days.
3.What payment methods are accepted for AT49BV320D-70TU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV320D-70TU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV320D-70TU?
AT49BV320D-70TU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV320D-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 AT49BV320D-70TU?
For technical support, including AT49BV320D-70TU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV320D-70TU requirements.
6.How does Aetrix verify that AT49BV320D-70TU is sourced from the original manufacturer or authorized distributors?
All AT49BV320D-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 AT49BV320D-70TU meets industry standards.
7.What is the process for return or replacement of AT49BV320D-70TU?
All AT49BV320D-70TU units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV320D-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 AT49BV320D-70TU part is unused and in its original packaging.
Return procedure for AT49BV320D-70TU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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