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Microchip Technology AT49BV002NT-12JC
- Part No.:
- AT49BV002NT-12JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49BV002NT-12JC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,607
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Product details
Overview
AT49BV002NT-12JC from Microchip Technology (formerly Atmel) is a 2 Mbit (256K × 8) single-supply 2.7–3.6 V in-system reprogrammable Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It features 120 ns read access time, 10-second chip erase, byte-programming at 30 µs/byte typical, 10,000 write cycles, and hardware data protection. It is commonly deployed in boot code storage for industrial controllers requiring field-upgradable firmware.
For engineers reviewing the AT49BV002NT-12JC datasheet, AT49BV002NT-12JC pinout, AT49BV002NT-12JC application, or AT49BV002NT-12JC equivalent, key selection criteria include its 32-pin PLCC package, boot block lockout capability, sector-erasable architecture (16K boot + two 8K parameter + two main memory blocks), and compatibility with standard 5V-command logic despite 3V operation.
Technical Context
The AT49BV002NT-12JC implements a command-register-based Flash architecture with software-controlled erase and programming. Its memory map is partitioned into five distinct sectors: one 16K-byte boot block (address 3C000H–3FFFFH), two 8K-byte parameter blocks, and two main memory blocks (96K and 128K bytes). Erase and program operations are initiated via six-cycle command sequences written to specific address/data latches.
It supports DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) for cycle completion detection, and includes hardware safeguards including VCC sense (<1.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibition (OE low, CE high, or WE high blocks writes). The RESET pin enables boot block override at 12 V - a feature present in the T-suffix variant but absent in N-suffix parts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), organized as 262,144 words × 8 bits - directly maps to 8-bit microcontroller data bus without glue logic. |
| Read Access Time | 120 ns maximum - meets timing requirements for 8 MHz Z80, 68K, or early ARM7 systems with no wait states. |
| Supply Voltage | 2.7 V to 3.6 V - compatible with single-cell Li-ion or regulated 3.3 V rails; eliminates need for dual-voltage design. |
| Erase Time | 10 seconds typical for full chip erase - enables rapid firmware updates in production test or field service. |
| Byte Programming | 30 µs/byte typical - allows fine-grained patching of configuration tables or calibration data without erasing entire sectors. |
| Endurance | 10,000 program/erase cycles - sufficient for firmware update cycles over 5+ years in industrial logging or HMI applications. |
| Standby Current | 50 µA CMOS - enables ultra-low-power retention in battery-backed systems during sleep modes. |
Pinout & Package
AT49BV002NT-12JC uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package with J-leads, suitable for socketed or surface-mount PCB layouts requiring mechanical robustness and thermal cycling resilience.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A14 used for sector commands per datasheet. |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface compatible with 8051, 68HC11, and similar microcontrollers; supports true read/write multiplexing. |
| CE | Chip Enable | Active-low chip select; enables device on shared bus; must be low with OE low and WE high for valid read access. |
| OE | Output Enable | Active-low output gate; controls data bus tristate; used with CE for bus contention avoidance in multi-device systems. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling edge; required for all command sequences and byte programming. |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-impedance outputs; 12 V input enables boot block override (T-suffix only). |
| VCC | Power Supply | +2.7 V to +3.6 V supply; decoupling capacitor required near pin for stable read/write margins. |
| GND | Ground Reference | Signal and power ground reference; must be low-inductance connection to minimize noise coupling during erase cycles. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Lockout | 16K-byte protected region (3C000H–3FFFFH) prevents accidental overwrite of bootloader code; enabled via 6-cycle command sequence. |
| Sector-Erasable Architecture | Independent erasure of boot block, two 8K parameter blocks, and two main memory blocks enables modular firmware updates without full chip erase. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line inhibition prevent spurious writes during power transients or EMI events. |
| DATA Polling & Toggle Bit | Real-time status feedback via I/O7 complement or I/O6 toggling eliminates need for fixed delay timers in host firmware. |
| 12 V RESET Override | Applying 12 V ±0.5 V to RESET pin during erase/program bypasses boot block lockout - critical for recovery after misconfiguration. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; provides 120 ns read access for deterministic scan-cycle execution. Use Value: Boot block lockout ensures bootloader integrity across 10,000+ field updates; sector erase enables incremental firmware patches without downtime. |
Use Scenario: Securing certified bootloader and safety-critical initialization routines in Class II medical instruments requiring regulatory traceability and tamper resistance. IC Role / Device Role / Timing Role: Trusted boot memory with hardware-enforced write protection; operates reliably at -40°C to +85°C industrial grade. Use Value: 12 V RESET override allows authorized recovery of locked boot sectors during service; 50 µA standby current extends battery life in portable diagnostics. |
| Automotive Body Control Module | Legacy Industrial HMI |
Use Scenario: Storing calibration tables and feature-enable flags in body control units where EEPROM endurance is insufficient for frequent updates. IC Role / Device Role / Timing Role: Field-upgradable nonvolatile memory interfaced to 8-bit MCUs via standard parallel bus; supports CAN-based OTA update protocols. Use Value: 30 µs/byte programming enables real-time parameter tuning; hardware data protection prevents corruption during vehicle battery transients. |
Use Scenario: Replacing obsolete EPROMs in legacy human-machine interface panels where UV-erasable devices require manual replacement. IC Role / Device Role / Timing Role: Drop-in parallel Flash replacement for 27C256/27C512 sockets; retains same 32-pin PLCC footprint and timing interface. Use Value: In-system reprogramming eliminates panel disassembly; 120 ns access matches original EPROM specs for zero-software-modification migration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF200A-70-4C-NHE | 3.3 V-only, 70 ns access, 2 Mbit, 48-pin TSOP; lacks 12 V RESET override and boot block lockout. | Designed for high-speed embedded systems with space-constrained PCBs; not suitable for boot-critical applications requiring hardware lockout. | Select when board layout favors TSOP and boot protection is managed in software or external logic. |
| MX29LV200CBTI-70G | 3.0–3.6 V, 70 ns, 2 Mbit, 48-pin TSOP; includes CFI-compliant command set and 16K boot sector with write protection. | CFI compliance simplifies driver porting across platforms; boot sector protection is software-configurable but lacks 12 V override. | Prefer for new designs requiring standardized Flash interfaces and broader ecosystem tool support. |
Compared with SST39VF200A-70-4C-NHE and MX29LV200CBTI-70G, the AT49BV002NT-12JC offers unique 12 V RESET-based boot recovery and PLCC packaging for socketed legacy upgrades, while trading off speed and package density for field-serviceability and hardware-level security.
Availability
AT49BV002NT-12JC is available at Aetrix Electronics and suitable for industrial automation, medical device firmware storage, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for AT49BV002NT-12JC 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-12JC belongs to Atmel's Battery-Voltage™ Flash family, designed specifically for reliable in-system reprogramming in resource-constrained 8-bit embedded systems with single-supply operation and hardware data integrity safeguards.
FAQ
What is the function of the RESET pin on the AT49BV002NT-12JC?
The RESET pin on the AT49BV002NT-12JC serves two roles: (1) as an active-low reset signal that halts ongoing operations and places outputs in high-impedance state, and (2) as a 12 V override input to temporarily disable boot block lockout during chip erase or byte programming. This dual functionality is exclusive to the T-suffix variants like AT49BV002NT-12JC and is not available on N-suffix parts.
How does the boot block lockout feature work in the AT49BV002NT-12JC?
The AT49BV002NT-12JC includes a 16K-byte boot block (3C000H–3FFFFH) that can be permanently write-protected via a six-cycle command sequence. Once enabled, programming or erasing this sector requires applying 12 V to the RESET pin. Unlike the N-suffix version, the T-suffix supports this override, making AT49BV002NT-12JC suitable for applications needing both security and field-recoverability.
What package type is used by the AT49BV002NT-12JC?
The AT49BV002NT-12JC uses a 32-lead Plastic Leaded Chip Carrier (PLCC) package, designated as "32J" in Atmel's ordering nomenclature. This J-leaded ceramic-like plastic package supports socketed prototyping and offers superior thermal cycling reliability compared to TSOP or VSOP alternatives, especially in industrial environments.
Can the AT49BV002NT-12JC be used as a direct replacement for older EPROMs like the 27C256?
Yes, the AT49BV002NT-12JC is pin-compatible with 27C256 in 32-pin PLCC packages and shares identical address/data/control pinouts (A0–A14, I/O0–I/O7, CE, OE, WE). Its 120 ns access time matches 27C256-12 variants, and it accepts standard 5 V command voltages while operating from 2.7–3.6 V - enabling seamless EPROM replacement without board redesign.
What are the supported erase methods for the AT49BV002NT-12JC?
The AT49BV002NT-12JC supports three erase methods: (1) full chip erase using a six-cycle 5555H/AAH → 2AAAH/55H → 5555H/80H → 5555H/AAH → 2AAAH/55H → 5555H/10H sequence, (2) sector erase targeting specific 8K or main memory blocks via address-dependent command, and (3) boot block erase only when lockout is disabled or overridden with 12 V on RESET.
AT49BV002NT-12JC 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:
- 120 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-12JC FAQ
1.How can I place an order for AT49BV002NT-12JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49BV002NT-12JC 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-12JC reliable?
The price and inventory of AT49BV002NT-12JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49BV002NT-12JC is usually 5 days.
3.What payment methods are accepted for AT49BV002NT-12JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49BV002NT-12JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49BV002NT-12JC?
AT49BV002NT-12JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49BV002NT-12JC 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-12JC?
For technical support, including AT49BV002NT-12JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49BV002NT-12JC requirements.
6.How does Aetrix verify that AT49BV002NT-12JC is sourced from the original manufacturer or authorized distributors?
All AT49BV002NT-12JC 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-12JC meets industry standards.
7.What is the process for return or replacement of AT49BV002NT-12JC?
All AT49BV002NT-12JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49BV002NT-12JC, 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-12JC part is unused and in its original packaging.
Return procedure for AT49BV002NT-12JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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