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Microchip Technology AT49BV002NT-90JC
- Part No.:
- AT49BV002NT-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49BV002NT-90JC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,645
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Product details
Overview
AT49BV002NT-90JC from 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 90 ns read access time, supports sector-erase architecture with 16K-byte boot block and hardware lockout, and targets industrial temperature range (−40°C to +85°C) in PLCC-32 package.
For engineers reviewing the AT49BV002NT-90JC datasheet, AT49BV002NT-90JC pinout, AT49BV002NT-90JC application, or AT49BV002NT-90JC equivalent, this page provides verified technical context, pin-level design meaning, real-world use scenarios, and validated alternative options for boot memory replacement in legacy microcontroller systems.
Technical Context
The AT49BV002NT-90JC implements a standard parallel Flash interface with CE/OE/WE control logic and supports EPROM-like read operation. Its internal command register enables software-controlled byte programming, sector erase, and chip erase without external high-voltage circuitry.
It features dual 8K-byte parameter blocks and two main memory blocks (96K and 128K bytes), with boot block address range 3C000H–3FFFFH. The RESET pin supports 12V override for boot block reprogramming - a capability confirmed absent in N(T) variants but present in T variants like this one.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - sufficient for full bootloader + configuration data in 8-bit/16-bit MCU systems. |
| Read Access Time | 90 ns max - ensures compatibility with 10 MHz bus timing in legacy 8051, Z80, or early ARM7 designs. |
| Supply Voltage | 2.7 V to 3.6 V - enables direct integration into 3.3 V systems without level-shifting or voltage regulation overhead. |
| Byte Programming Time | 30 µs typical - allows rapid field updates of small firmware patches without system downtime. |
| Erase Cycle Time | 10 seconds max for full chip erase - predictable duration for automated programming stations and production line cycle planning. |
| End-of-Program Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6) - eliminates need for fixed delay timers in host firmware. |
| Write Endurance | 10,000 program/erase cycles - meets long-term field update requirements for industrial HMI and telecom edge devices. |
Pinout & Package
AT49BV002NT-90JC uses a 32-lead Plastic Leaded Chip Carrier (PLCC-32) package with J-leads, rated for industrial temperature range (−40°C to +85°C). Pin 1 is NC (No Connect) per datasheet Rev. 0982D.
| 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. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access - prevents bus contention in shared-memory systems. |
| OE | Output Enable | Active-low output control; decouples Flash outputs from data bus during standby or write cycles. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence timing - critical for reliable command entry. |
| RESET* | Reset Input | Active-low reset; applying 12 V ± 0.5 V overrides boot block lockout - unique to T-suffix variants for secure recovery. |
| I/O0–I/O7 | Data I/O Bus | Bi-directional 8-bit data path; supports DATA polling (I/O7) and Toggle Bit (I/O6) for status monitoring without dedicated status pins. |
| VCC | Power Supply | 2.7–3.6 V supply; internal voltage sensing inhibits programming if VCC drops below ~1.8 V - prevents corruption during brown-out. |
| GND | Ground | Reference for all inputs/outputs; required for stable DC characteristics and noise immunity in mixed-signal PCB layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Lockout | 16K-byte protected region (3C000H–3FFFFH) prevents accidental overwrite of bootloader code - essential for field-upgradeable embedded systems. |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns pulse rejection), and control-line inhibition (OE low/CE high/WE high) eliminate spurious writes in electrically noisy environments. |
| Sector Erase Architecture | Independent erasure of two 8K-byte parameter blocks and two main memory blocks (96K/128K) enables modular firmware updates without full chip erase. |
| 12V RESET Override | Applying 12 V to RESET pin during erase/program restores boot block writability even after lockout - enables secure recovery in deployed systems. |
| CMOS Standby Current | 50 µA max - reduces power budget impact in battery-backed or always-on industrial controllers during idle periods. |
Applications
| Industrial PLC Firmware Storage | Legacy Telecom Equipment Boot Memory |
|---|---|
Use Scenario: Storing boot firmware and configuration parameters in programmable logic controllers with no external EEPROM. IC Role / Device Role / Timing Role: Primary nonvolatile boot memory mapped to CPU address space; accessed via parallel bus during power-on reset sequence. Use Value: Sector-erase capability allows independent update of parameter blocks without disturbing bootloader integrity - reducing maintenance downtime. | Use Scenario: Holding initialization code and calibration data in TDM-based voice gateways operating in extended temperature environments. IC Role / Device Role / Timing Role: Standalone Flash memory providing 90 ns read access to meet tight timing budgets of legacy DSP interfaces. Use Value: 12V RESET override enables remote recovery of corrupted boot sectors - eliminating need for on-site technician visits. |
| Medical Device Diagnostic Module | Automotive Body Control Unit (BCU) |
Use Scenario: Storing self-test routines and fault logs in portable diagnostic tools requiring long-term data retention. IC Role / Device Role / Timing Role: Nonvolatile storage for critical diagnostic binaries; accessed only during startup or service mode. Use Value: Hardware lockout prevents unauthorized modification of safety-critical boot code - supporting IEC 62304 compliance. | Use Scenario: Hosting vehicle-specific configuration tables and minor firmware patches in body control modules with constrained PCB space. IC Role / Device Role / Timing Role: Secondary Flash memory co-located with MCU for over-the-air update staging area. Use Value: PLCC-32 package offers robust thermal cycling performance and reworkability - critical for automotive manufacturing yield. |
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 operation (3.0–3.6 V), 90 ns access, same 2 Mbit density and PLCC-32 package; lacks 12V RESET override and boot block lockout override. | No hardware boot protection override - requires full chip erase to recover locked boot sectors. | Select when strict boot security is not required and lower cost is prioritized over field-recovery capability. |
| MX29LV002CTTI-90G | 3.3 V operation, 90 ns access, 2 Mbit density, TSOP-32 package; includes boot block protection but no 12V RESET feature; different command set and sector map. | TSOP-32 footprint incompatible with PLCC-32 layout - requires PCB redesign. | Select only if board revision allows package change and host firmware can accommodate alternate command sequences. |
Compared with SST39VF020-90-4C-NHE and MX29LV002CTTI-90G, the AT49BV002NT-90JC uniquely combines PLCC-32 compatibility, industrial temperature rating, and 12V RESET-based boot recovery - making it irreplaceable in legacy systems requiring zero-layout-change field servicing.
Availability
AT49BV002NT-90JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy telecom equipment boot memory, and medical diagnostic module applications requiring stable component supply across extended lifecycle programs.
Supply support for AT49BV002NT-90JC 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
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, Flash memory, and secure authentication ICs for industrial and automotive markets.
The AT49BV/LV002(N)(T) product line was designed for in-system reprogrammable boot code storage in resource-constrained 8-bit and 16-bit embedded systems - emphasizing reliability, sector-level flexibility, and hardware-based data protection.
FAQ
What is the boot block address range for AT49BV002NT-90JC?
The AT49BV002NT-90JC has a 16K-byte boot block located at address range 3C000H to 3FFFFH. This differs from non-T variants (e.g., AT49BV002N), which place the boot block at 00000H–03FFFH. The T-suffix denotes top-boot architecture, enabling efficient mapping for systems that execute code from high memory addresses.
Does AT49BV002NT-90JC support 12V programming override?
Yes, AT49BV002NT-90JC supports 12V ± 0.5V applied to the RESET pin during erase or programming operations to override boot block lockout. This feature is explicitly documented for T-suffix variants and is absent in N(T) or plain (N) versions - confirming its presence in AT49BV002NT-90JC.
What package type and lead count does AT49BV002NT-90JC use?
AT49BV002NT-90JC uses a 32-lead Plastic Leaded Chip Carrier (PLCC-32) package with J-leads. Pin 1 is designated as "Don't Connect" (NC) per datasheet Rev. 0982D, and the device is rated for industrial temperature operation (−40°C to +85°C).
How does AT49BV002NT-90JC detect end-of-program without polling?
AT49BV002NT-90JC provides Toggle Bit detection on I/O6: during programming or erase, successive reads cause I/O6 to toggle between 0 and 1; when toggling stops, the operation is complete. This hardware status method eliminates reliance on fixed delays or software polling loops in host firmware.
Is AT49BV002NT-90JC pin-compatible with AT49BV002N-90JC?
No - while both use PLCC-32 packaging, AT49BV002NT-90JC and AT49BV002N-90JC differ in boot block location (3C000H vs. 00000H), RESET pin functionality (12V override enabled vs. DC-only), and sector map definitions. These differences require firmware and address decoding changes - they are not drop-in replacements.
AT49BV002NT-90JC 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49BV002NT-90JC FAQ
1.How can I place an order for AT49BV002NT-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV002NT-90JC 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-90JC reliable?
The price and inventory of AT49BV002NT-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV002NT-90JC is usually 5 days.
3.What payment methods are accepted for AT49BV002NT-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV002NT-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV002NT-90JC?
AT49BV002NT-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV002NT-90JC 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-90JC?
For technical support, including AT49BV002NT-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV002NT-90JC requirements.
6.How does Aetrix verify that AT49BV002NT-90JC is sourced from the original manufacturer or authorized distributors?
All AT49BV002NT-90JC 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-90JC meets industry standards.
7.What is the process for return or replacement of AT49BV002NT-90JC?
All AT49BV002NT-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV002NT-90JC, 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-90JC part is unused and in its original packaging.
Return procedure for AT49BV002NT-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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