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Microchip Technology AT49BV002NT-12VI
- Part No.:
- AT49BV002NT-12VI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT49BV002NT-12VI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,206
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Product details
Overview
AT49BV002NT-12VI from Microchip Technology (formerly Atmel) is a 2-Mbit (256K × 8) single-supply Flash memory IC designed for in-system reprogrammability in embedded boot code storage. It operates at 2.7–3.6 V, delivers 120 ns read access time, supports sector-erase architecture with 16K-byte boot block and two 8K-byte parameter blocks, and features hardware data protection and DATA polling for program cycle detection. It is used in industrial microcontroller boot loaders requiring nonvolatile, field-upgradable firmware storage.
For engineers reviewing the AT49BV002NT-12VI datasheet, AT49BV002NT-12VI pinout, AT49BV002NT-12VI application, or AT49BV002NT-12VI equivalent, this page provides verified technical context, package-specific pin functions, real-world use cases in boot memory systems, and validated alternative parts for design continuity-based on official Microchip documentation Rev. 0982D–FLASH–02/03.
Technical Context
The AT49BV002NT-12VI implements a standard parallel Flash interface with CE/OE/WE control logic and supports both chip-erase and sector-erase commands via six-cycle software sequences. Its internal program controller manages byte-by-byte programming (30 µs typical) and automatic erase timing without external clocks.
It features dual-mode reset functionality: TTL-level RESET enables standard operation halt and high-Z output, while 12 V applied to RESET overrides boot block lockout during erase/program cycles-a capability exclusive to the (T) variant and confirmed absent in N(T) versions per datasheet Note on p.3.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), organized as 262,144 words × 8 bits-supports full firmware image storage for 8-bit microcontrollers. |
| Read Access Time | 120 ns max-compatible with legacy 8-bit bus timing budgets up to 8.3 MHz. |
| Supply Voltage | 2.7 V to 3.6 V-enables direct connection to 3.3 V system rails without level-shifting. |
| Byte Programming Time | 30 µs typical-allows rapid field updates of small configuration or patch data. |
| Erase Cycle Time | 10 seconds max for full chip erase-deterministic timing simplifies host firmware timeout handling. |
| Endurance | 10,000 write/erase cycles-validated for long-life embedded applications with infrequent firmware updates. |
| Standby Current | 50 µA CMOS-minimizes power draw in sleep modes of battery-backed systems. |
Pinout & Package
AT49BV002NT-12VI is packaged in a 32-lead VSOP (8 × 14 mm), pin-compatible with TSOP and PLCC variants but optimized for space-constrained industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A16 used for byte selection within 8-bit data bus. |
| I/O0–I/O7 | Data Inputs/Outputs | Bi-directional 8-bit data bus; latched on rising edge of WE/CE during programming, driven during read. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access-prevents bus contention. |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high-enables shared bus operation. |
| WE | Write Enable | Active-low write strobe; initiates command latching and programming cycles on falling/rising edges per bus cycle timing. |
| RESET | Reset Input | Active-low TTL reset; halts ongoing operations and forces high-Z outputs; 12 V override enables boot block reprogramming. |
| VCC | Power Supply | 2.7–3.6 V main supply; internal voltage regulation ensures stable core operation across rail tolerance. |
| GND | Ground | Reference return path for all digital and programming currents; decoupling required per datasheet layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Lockout | 16K-byte protected sector (address 3C000H–3FFFFH) prevents accidental overwrite of critical boot code-enabled via 6-cycle command sequence. |
| DATA Polling | I/O7 complements last programmed byte during write; signals completion without polling delay loops-reduces host CPU overhead. |
| Toggle Bit Detection | I/O6 toggles during erase/program; provides asynchronous status indication-enables concurrent host task execution. |
| Hardware Data Protection | VCC sense (<1.8 V inhibits programming), noise filter (rejects <15 ns glitches), and control-line inhibit (OE low/CE high/WE high blocks writes)-ensures robustness in noisy environments. |
| Sector Erase Flexibility | Independent erase of two 8K-byte parameter blocks and two main memory blocks (96K/128K bytes)-enables modular firmware updates without full chip erase. |
Applications
| Industrial PLC Boot Memory | Medical Device Firmware Storage |
|---|---|
|
Use Scenario: Storing bootloader and safety-critical initialization code in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped to MCU reset vector; accessed within first 120 ns after power-on or reset assertion. Use Value: Boot block lockout ensures certified firmware remains unaltered during field updates to application partitions-meeting IEC 61508 SIL-2 requirements. |
Use Scenario: Holding calibrated sensor firmware and regulatory-compliant device configuration in portable diagnostic equipment. IC Role / Device Role / Timing Role: Parallel Flash memory interfaced to ARM Cortex-M3 MCU via GPIO-banged 8-bit bus; erased/programmed only during service mode. Use Value: 50 µA standby current extends battery life between calibrations; sector erase allows parameter block updates without disturbing main firmware. |
| Telecom Edge Node Configuration | Automotive Body Control Module |
|
Use Scenario: Storing network stack parameters and secure boot keys in cellular base station remote units operating at -40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-grade Flash providing persistent storage for runtime-configurable MAC/IP settings and cryptographic keys. Use Value: 10,000-cycle endurance supports multi-year field deployment with periodic security patches; 12 V RESET override enables recovery from corrupted boot sectors. |
Use Scenario: Retaining vehicle-specific calibration data and ECU boot code in body control modules subject to automotive temperature cycling. IC Role / Device Role / Timing Role: In-system reprogrammable Flash memory directly connected to 8-bit automotive MCU; accessed during cold start sequence. Use Value: Hardware data protection (VCC sense, noise filtering) prevents spurious writes during load-dump transients-meeting ISO 7637-2 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF020-70-4C-NHE | 2 Mbit, 70 ns access, 3.0–3.6 V; lacks 12 V RESET override and boot block lockout override capability. | No hardware-based boot sector recovery path; requires full chip erase if boot code corruption occurs. | Select when 70 ns speed is mandatory and boot block recovery is handled externally via redundant storage or host firmware. |
| MX29LV020TC-70G | 2 Mbit, 70 ns access, 3.0–3.6 V; includes CFI-compliant command set but no dedicated 12 V RESET pin function. | Relies on software-controlled lock bits only; no physical voltage-based override for locked boot sectors. | Prefer for designs already using CFI-standard Flash toolchains and where boot sector integrity is enforced via secure boot ROM. |
Compared with SST39VF020-70-4C-NHE and MX29LV020TC-70G, the AT49BV002NT-12VI uniquely provides 12 V RESET-driven boot block reprogramming-critical for field-recoverable industrial systems where firmware corruption must be resolved without component replacement.
Availability
AT49BV002NT-12VI is available at Aetrix Electronics and suitable for industrial PLC boot memory, medical device firmware storage, and telecom edge node configuration requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT49BV002NT-12VI 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 support for legacy Atmel Flash products including the AT49BV series, ensuring long-term documentation, reliability data, and obsolescence mitigation.
The AT49BV002NT-12VI belongs to Atmel's Battery-Voltage™ Flash family, engineered specifically for reliable in-system reprogramming in resource-constrained 3.3 V embedded systems where boot code integrity and field upgradeability are mission-critical.
FAQ
What is the boot block address range for AT49BV002NT-12VI?
The AT49BV002NT-12VI uses the (T) variant memory map: its 16K-byte boot block occupies addresses 3C000H to 3FFFFH. This differs from non-(T) versions (e.g., AT49BV002N), which locate the boot block at 00000H–03FFFH. The (T) mapping isolates boot code at the top of the address space-facilitating clean separation from application firmware stored in lower sectors.
Does AT49BV002NT-12VI support 12 V programming voltage?
No-AT49BV002NT-12VI operates exclusively from a single 2.7–3.6 V supply for both read and write operations. The 12 V signal applies only to the RESET pin to override boot block lockout during erase/program cycles; it is not a programming voltage and does not connect to VCC or I/O pins. Internal charge pumps generate all required high-voltage pulses.
Can AT49BV002NT-12VI be used as a direct replacement for AT49BV002N-12VI?
No-AT49BV002NT-12VI and AT49BV002N-12VI differ in boot block location (3C000H vs. 00000H) and RESET functionality: the (T) version supports 12 V override of boot lockout, while the (N) version does not. Software that assumes bottom-addressed boot code or relies on (N)-specific command sequences will require modification for AT49BV002NT-12VI.
What package type is used by AT49BV002NT-12VI?
AT49BV002NT-12VI is supplied in a 32-lead Very Small Outline Package (VSOP), measuring 8 mm × 14 mm. This surface-mount package offers improved thermal performance and board density over PDIP and PLCC alternatives, and is pin-compatible with TSOP variants-enabling flexible layout reuse across product generations.
How does DATA polling work on AT49BV002NT-12VI?
During byte programming, AT49BV002NT-12VI drives the complement of the loaded data onto I/O7. When programming completes, true data appears on all I/O lines-including I/O7-and the next memory access may begin immediately. This eliminates fixed delay loops in host firmware, reducing update latency and improving system responsiveness during field upgrades.
AT49BV002NT-12VI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.488", 12.40mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 120 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VSOP
AT49BV002NT-12VI FAQ
1.How can I place an order for AT49BV002NT-12VI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV002NT-12VI 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 AT49BV002NT-12VI reliable?
The price and inventory of AT49BV002NT-12VI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV002NT-12VI is usually 5 days.
3.What payment methods are accepted for AT49BV002NT-12VI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV002NT-12VI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV002NT-12VI?
AT49BV002NT-12VI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV002NT-12VI 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 AT49BV002NT-12VI?
For technical support, including AT49BV002NT-12VI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV002NT-12VI requirements.
6.How does Aetrix verify that AT49BV002NT-12VI is sourced from the original manufacturer or authorized distributors?
All AT49BV002NT-12VI 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 AT49BV002NT-12VI meets industry standards.
7.What is the process for return or replacement of AT49BV002NT-12VI?
All AT49BV002NT-12VI units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV002NT-12VI, 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 AT49BV002NT-12VI part is unused and in its original packaging.
Return procedure for AT49BV002NT-12VI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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