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Microchip Technology AT49BV002NT-90JI
- Part No.:
- AT49BV002NT-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49BV002NT-90JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,996
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Product details
Overview
AT49BV002NT-90JI from Microchip Technology (formerly Atmel) is a 2 Mbit (256K × 8) single-supply 2.7–3.6V in-system reprogrammable Flash memory with 90 ns read access time, 10-second chip erase cycle, and sector-based architecture including a 16K-byte boot block with programmable lockout. It supports industrial temperature operation (−40°C to +85°C) and is used in embedded firmware storage for microcontroller-based systems requiring field-upgradable code.
For engineers reviewing the AT49BV002NT-90JI datasheet, AT49BV002NT-90JI pinout, AT49BV002NT-90JI application, or AT49BV002NT-90JI equivalent, key selection criteria include boot-sector protection capability, 3V-only programming compatibility, TSOP/PLCC package options, and DATA polling/Toggle Bit end-of-operation detection for reliable firmware update sequencing.
Technical Context
The AT49BV002NT-90JI implements a command-register-based architecture using standard CE/OE/WE control lines identical to EPROM interface timing, enabling drop-in replacement in legacy 8-bit bus systems. Its internal logic handles erase and program operations autonomously after command sequence entry - no external high-voltage programming supply required.
It features dual 8K-byte parameter blocks and two main memory blocks (96K and 128K bytes), with boot block address range fixed at 3C000H–3FFFFH. The RESET pin enables hardware reset and, when driven to 12 V, overrides boot lockout - a capability confirmed absent in N-suffix variants but present in T-suffix devices like this one.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), directly maps to 256 KB of firmware or configuration data storage |
| Read Access Time | 90 ns - ensures compatibility with 11 MHz system buses without wait states |
| Supply Voltage Range | 2.7 V to 3.6 V - supports battery-powered and low-voltage industrial designs |
| Erase Cycle Time | 10 seconds (typical) - enables full-chip or sector erase within predictable firmware update windows |
| Byte Programming Time | 30 µs (typical) - allows fine-grained patching without bulk reprogramming overhead |
| End-of-Operation Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delay timers in host firmware |
| Boot Block Protection | 16K-byte sector (3C000H–3FFFFH) with lockout via 6-cycle command; override possible via 12 V on RESET - critical for secure bootloader integrity |
Pinout & Package
AT49BV002NT-90JI is available in 32-lead PLCC (32J), PDIP (32P6), TSOP (32T), and VSOP (32V) packages. This part uses the industrial-grade version with extended temperature support.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A14 used for software ID mode |
| I/O0–I/O7 | Data Input/Output | Bi-directional 8-bit data bus; I/O0 indicates boot lockout status; I/O6 = Toggle Bit; I/O7 = DATA polling indicator |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for read access; controls device selection on shared bus |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during read cycles |
| WE | Write Enable | Active-low write strobe; latches address/data during command sequences and byte programming |
| RESET | Reset Input | Active-low hardware reset; 12 V input enables boot block reprogramming even when lockout is active - unique to T-suffix variants |
| VCC | Power Supply | 2.7–3.6 V core supply; decoupling required per JEDEC standards for stable 90 ns read timing |
| GND | Ground Reference | Signal and power ground reference plane; separate analog/digital grounding not required |
Key Features
| Feature | Design Value |
|---|---|
| Single 2.7–3.6 V supply for read/write | Eliminates need for dual-voltage rails or charge pumps - reduces BOM count and PCB complexity |
| Boot block programming lockout with 12 V override | Enables permanent bootloader storage while allowing field updates to application code; 12 V RESET override provides recovery path without hardware redesign |
| Sector architecture with independent erasable blocks | Supports modular firmware updates: parameter blocks (8K each) and main memory blocks (96K/128K) can be erased individually to minimize update time and wear |
| Hardware data protection (VCC sense, noise filter, inhibit logic) | Prevents spurious writes during power ramp-up, EMI events, or bus glitches - improves field reliability without host-side validation |
| CMOS standby current ≤50 µA | Enables ultra-low-power retention in battery-backed systems such as smart meters or remote sensors |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader |
|---|---|
Use Scenario: Storing firmware and calibration tables in programmable logic controllers operating in harsh factory environments with wide temperature swings. IC Role / Device Role / Timing Role: Nonvolatile code storage with guaranteed 90 ns read access and industrial-temp reliability; boot block holds safety-critical startup routines. Use Value: Enables in-field firmware upgrades without replacing hardware; boot lockout prevents accidental corruption of certified control logic. |
Use Scenario: Securing bootloader and regulatory-certified initialization code in portable diagnostic equipment requiring FDA-compliant update traceability. IC Role / Device Role / Timing Role: Trusted execution anchor - boot block stores immutable startup code verified at power-on; main memory holds updatable application binaries. Use Value: 12 V RESET override allows authorized service personnel to recover corrupted boot code without sending units back to depot. |
| Automotive Body Control Module | Telecom Remote Node Configuration |
Use Scenario: Holding vehicle-specific configuration data and minor firmware patches in body control units where space and voltage headroom are constrained. IC Role / Device Role / Timing Role: Low-voltage (2.7 V) compatible Flash memory interfaced directly to 8-bit MCU bus; operates across −40°C to +85°C without derating. Use Value: Eliminates need for external level shifters or voltage translators; sector erase minimizes update time during dealership reprogramming. |
Use Scenario: Storing protocol stacks and site-specific settings in outdoor telecom repeaters exposed to thermal cycling and intermittent power. IC Role / Device Role / Timing Role: High-reliability nonvolatile storage with DATA polling for deterministic update completion signaling under variable supply conditions. Use Value: 10,000 write/erase cycles and <50 µA standby current extend field lifetime while reducing maintenance frequency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF020-90-4C-NHE | 3.3 V only (3.0–3.6 V), 90 ns access, same 2 Mbit density and PLCC/TSOP packages; lacks 12 V RESET override | No boot block lockout override - requires full chip erase if bootloader becomes corrupted | Select when boot block override is unnecessary and SST's faster 1 µs write recovery is beneficial |
| MX29LV020TC-90G | 3.3 V supply, 90 ns access, 2 Mbit density; includes CFI query support and wider VCC tolerance (2.7–3.6 V); no 12 V RESET feature | CFI compliance simplifies auto-detection in generic flash programmers; lacks hardware boot override path | Choose for standardized flash abstraction layers (e.g., U-Boot) where CFI enumeration is required |
Compared with SST39VF020-90-4C-NHE and MX29LV020TC-90G, the AT49BV002NT-90JI uniquely delivers 12 V RESET-based boot block recovery - a critical differentiator for safety-critical or remotely deployed systems where field repair must avoid full reflash procedures.
Availability
AT49BV002NT-90JI is available at Aetrix Electronics and suitable for industrial automation, medical electronics, automotive body control, and telecom infrastructure requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for AT49BV002NT-90JI 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 manufacturing, documentation, and technical assistance.
The AT49BV002NT-90JI belongs to Atmel's Battery-Voltage™ Flash family, designed specifically for 3V embedded systems needing in-system reprogrammability, robust data retention, and hardware-level security features like boot block protection.
FAQ
What is the boot block address range for AT49BV002NT-90JI?
The AT49BV002NT-90JI boot block occupies address range 3C000H to 3FFFFH (16K bytes). This differs from non-T variants (e.g., AT49BV002N), which locate the boot block at 00000H–03FFFH. The T-suffix denotes top-boot architecture, placing protected code at the highest memory addresses - a layout preferred for modern MCU vector table placement.
Does AT49BV002NT-90JI support 12 V programming on the RESET pin?
Yes, AT49BV002NT-90JI supports 12 V ±0.5 V applied to the RESET pin to override boot block programming lockout during chip erase, sector erase, or byte programming. This feature is explicitly documented for T-suffix devices and is absent in N-suffix variants like AT49BV002N-90JI. The 12 V signal must be maintained throughout the operation.
What package options are available for AT49BV002NT-90JI?
AT49BV002NT-90JI is offered in four industry-standard packages: 32-lead PLCC (32J), 32-lead PDIP (32P6), 32-lead TSOP (32T), and 32-lead VSOP (32V). All variants share identical electrical specifications and timing; package selection depends on board space, thermal requirements, and assembly process constraints.
How does DATA polling work on AT49BV002NT-90JI?
During byte programming on AT49BV002NT-90JI, reading the programmed address returns the complement of the loaded data on I/O7 until completion. Once valid data appears on I/O7, the program cycle has finished. This allows host firmware to poll asynchronously without fixed delays - a key advantage over timer-based approaches in resource-constrained MCUs.
Is AT49BV002NT-90JI pin-compatible with AT49BV002N-90JI?
No, AT49BV002NT-90JI is not pin-compatible with AT49BV002N-90JI. While both use 32-pin packages, the RESET pin on AT49BV002NT-90JI is functional for 12 V override, whereas on AT49BV002N-90JI it is a no-connect (DC) pin. Interchanging them risks incorrect reset behavior or failure to unlock the boot block when needed.
AT49BV002NT-90JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- 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:
- 90 ns
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49BV002NT-90JI FAQ
1.How can I place an order for AT49BV002NT-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV002NT-90JI 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-90JI reliable?
The price and inventory of AT49BV002NT-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV002NT-90JI is usually 5 days.
3.What payment methods are accepted for AT49BV002NT-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV002NT-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV002NT-90JI?
AT49BV002NT-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV002NT-90JI 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-90JI?
For technical support, including AT49BV002NT-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV002NT-90JI requirements.
6.How does Aetrix verify that AT49BV002NT-90JI is sourced from the original manufacturer or authorized distributors?
All AT49BV002NT-90JI 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-90JI meets industry standards.
7.What is the process for return or replacement of AT49BV002NT-90JI?
All AT49BV002NT-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV002NT-90JI, 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-90JI part is unused and in its original packaging.
Return procedure for AT49BV002NT-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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