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Microchip Technology AT49F002NT-12JC
- Part No.:
- AT49F002NT-12JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002NT-12JC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,408
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Product details
Overview
AT49F002NT-12JC from Atmel is a 5V-only, 2 Mbit (256K × 8) in-system reprogrammable Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It delivers 120 ns read access time, supports byte-by-byte programming (10 µs/byte typical), features sector-based architecture with 16K-byte boot block and hardware data protection, and operates across industrial temperature range (–40°C to +85°C) in PLCC-32 package.
For engineers reviewing the AT49F002NT-12JC datasheet, AT49F002NT-12JC pinout, AT49F002NT-12JC application, or AT49F002NT-12JC equivalent, key selection criteria include its 5V-only operation, boot block lockout capability, DATA polling/Toggle Bit erase-program status detection, 10,000 write cycles endurance, and compatibility with standard EPROM-like bus interface timing.
Technical Context
The AT49F002NT-12JC implements a command-register-based architecture requiring six-byte software sequences for chip/sector erase and boot block lockout enable. Its internal program control logic eliminates external high-voltage programming supplies, relying solely on 5V VCC and standard CE/OE/WE timing.
Memory organization includes four distinct sectors: one 16K-byte boot block (address 3C000H–3FFFFH), two 8K-byte parameter blocks, and two main memory blocks (96K and 128K bytes). Sector erase and chip erase are fully self-timed, with tEC = 10 seconds maximum.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - supports full firmware image storage for 8-bit microcontrollers. |
| Read Access Time | 120 ns max - compatible with 8 MHz Z80, 68000, or 8051 bus timing without wait states. |
| Byte Programming Time | 10 µs typical - enables fast field updates of configuration parameters or calibration data. |
| Erase Cycle Time | 10 seconds max (chip or sector) - deterministic, internally timed; no external clock required. |
| Endurance | 10,000 program/erase cycles - validated for long-life industrial logging and firmware update applications. |
| Operating Voltage | 5.0 V ±10% - single-supply operation eliminates need for charge pumps or voltage translators. |
| Temperature Range | –40°C to +85°C - qualified for industrial-grade embedded systems including motor controls and PLC modules. |
| Standby Current | 300 µA max (industrial grade) - enables low-power sleep modes in battery-backed systems. |
Pinout & Package
AT49F002NT-12JC is housed in a 32-lead Plastic J-leaded Chip Carrier (PLCC-32) package with 1.27 mm pitch, 18.5 × 18.5 mm body, and JEDEC MS-016AE compliance. Pin 1 is marked by index notch; pin 9 is NC (not connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A17 selects upper/lower half of memory map. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface compatible with standard microprocessor data buses; high-impedance during standby/read disable. |
| CE | Chip Enable | Active-low chip select; must be low for read/write access; enables bus contention management when shared with other devices. |
| OE | Output Enable | Active-low output control; allows data output gating independent of CE, supporting multiplexed bus architectures. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence timing requirements. |
| RESET | Reset Input | Active-low reset halts ongoing operations and forces high-Z outputs; 12V override enables boot block reprogramming when lockout is active. |
| VCC / GND | Power Supply | 5V ±10% supply with decoupling recommended near pins 16 (VCC) and 32 (GND); CMOS-level power efficiency. |
| DC | No Connect | Pin 9 is unconnected - must be left floating or tied to ground per PCB layout best practice; not electrically bonded. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Programming Lockout | 16K-byte protected region (3C000H–3FFFFH) prevents accidental overwrite of bootloader code; enabled via 6-byte command sequence. |
| DATA Polling & Toggle Bit | Dual real-time status feedback: I/O7 complement indicates program completion; I/O6 toggling signals active erase/program cycle - eliminates need for fixed delay timers. |
| Hardware Data Protection | VCC sense (<3.8V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line interlock (OE low/CE high/WE high blocks writes) prevent spurious writes. |
| Sector Erase Flexibility | Independent erasure of two 8K parameter blocks and two main memory blocks (96K/128K) enables modular firmware updates without full chip erase. |
| 5V-Only In-System Reprogrammability | No external 12V programming supply needed; all commands executed using standard 5V logic levels and microprocessor write cycles. |
| Industrial Temperature Qualification | Specified for –40°C to +85°C operation with ISB2 ≤ 3 mA and ICC ≤ 50 mA - suitable for under-hood automotive ECUs and factory-floor controllers. |
Applications
| Industrial PLC Firmware Storage | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Storing and updating ladder logic programs and I/O configuration tables in programmable logic controllers deployed in manufacturing lines. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-field reprogrammability; 120 ns read access supports real-time scan cycle execution at 10 kHz. Use Value: Boot block lockout ensures bootloader integrity during remote firmware upgrades over Modbus RTU, preventing bricking during power interruption. | Use Scenario: Holding calibrated fuel injection maps and diagnostic routines in engine management systems subject to thermal cycling and EMI. IC Role / Device Role / Timing Role: Primary flash memory for executable code; operates reliably at –40°C cold start and +85°C under-hood ambient. Use Value: Hardware data protection (VCC sense, noise filtering) prevents corruption during load dump transients; 10,000-cycle endurance supports lifetime recalibration. |
| Medical Infusion Pump Controller | Point-of-Sale Terminal BIOS |
Use Scenario: Storing safety-critical dosing algorithms and device calibration constants in Class II medical devices requiring traceable firmware revisions. IC Role / Device Role / Timing Role: Secure, write-protected nonvolatile memory; boot block holds certified bootloader verified at power-on. Use Value: 12V RESET override allows authorized service technicians to recover corrupted boot code without component replacement - meeting IEC 62304 traceability requirements. | Use Scenario: Hosting BIOS firmware and peripheral initialization code in retail payment terminals exposed to frequent power cycling and environmental stress. IC Role / Device Role / Timing Role: EPROM-compatible flash replacing obsolete UV-erasable parts; interfaces directly with x86 southbridge chipsets. Use Value: Sector erase enables partial BIOS updates (e.g., security patches) without erasing vendor-specific configuration blocks stored in parameter sectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV002BT-120EC | 3V/5V dual-voltage operation; 120 ns access; 2 Mbit; boot block at top address; requires 12V for reset override. | Supports mixed-voltage systems; lacks DATA polling (uses Ready/Busy pin instead); different command set. | Select if system already uses 3V logic or requires Ready/Busy signaling instead of polling. |
| SST39VF200A-120-4C-NHE | 3.3V-only; 120 ns access; 2 Mbit; top-boot architecture; no 12V RESET override; 100,000-cycle endurance. | Lower power (25 mA active), but incompatible with 5V-only designs; no hardware boot lockout override path. | Select for new 3.3V designs prioritizing endurance and lower active current over 5V legacy compatibility. |
Compared with AM29LV002BT-120EC and SST39VF200A-120-4C-NHE, the AT49F002NT-12JC uniquely combines strict 5V-only operation, 12V RESET-based boot recovery, and DATA polling/Toggle Bit status reporting - making it optimal for retrofitting legacy 5V microcontroller systems requiring field-upgradable firmware with guaranteed bootloader integrity.
Availability
AT49F002NT-12JC is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, medical device firmware, and point-of-sale terminal BIOS applications requiring stable component supply, long-term lifecycle support, and drop-in compatibility with legacy PLCC-32 footprints.
Supply support for AT49F002NT-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
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT49F002(N)(T) product line was designed as a direct 5V-only Flash memory replacement for EPROMs in legacy embedded systems, emphasizing in-system reprogrammability, boot code protection, and robustness in harsh operating environments.
FAQ
What is the boot block address range for AT49F002NT-12JC?
The AT49F002NT-12JC uses the AT49F002(N)T variant memory map, where the 16K-byte boot block occupies addresses 3C000H to 3FFFFH. This top-boot configuration isolates critical startup code from main application updates. The AT49F002NT-12JC datasheet confirms this mapping in the Block Diagram and Command Definitions sections, distinguishing it from the bottom-boot AT49F002(N) variant.
Does AT49F002NT-12JC support true 5V-only programming without external high voltage?
Yes, AT49F002NT-12JC performs all programming and erase operations using only 5V ±10% VCC - no external 12V supply is required. Internal charge pumps generate necessary voltages, and command sequences (e.g., Byte Program, Sector Erase) are executed with standard microprocessor write cycles. The RESET pin's 12V override is strictly for boot block recovery and does not affect normal programming.
How is end-of-program detection implemented in AT49F002NT-12JC?
AT49F002NT-12JC provides two hardware-supported methods: DATA polling (reading the programmed byte returns complemented data on I/O7 until completion) and Toggle Bit (I/O6 toggles during active programming/erasing and stabilizes upon completion). Both methods eliminate fixed delays and enable precise synchronization in real-time firmware update routines.
What is the function of pin 9 on AT49F002NT-12JC?
Pin 9 on AT49F002NT-12JC is designated "DC" (Don't Connect) and is electrically unconnected. Per the AT49F002(N)(T) datasheet, this pin must remain unconnected - neither tied to VCC nor GND - to avoid potential latch-up or signal integrity issues. Its presence is mechanical (PLCC-32 package standardization), not functional.
Can AT49F002NT-12JC be used in place of AT49F002N-12JC?
No, AT49F002NT-12JC and AT49F002N-12JC are not interchangeable. The "T" suffix denotes top-boot architecture (boot block at 3C000H–3FFFFH), while the "N" variant uses bottom-boot (00000H–03FFFH). Their command sequences, memory maps, and boot block lockout behavior differ fundamentally - substituting one for the other will cause bootloader execution failure or unintended sector erasure.
AT49F002NT-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:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49F002NT-12JC FAQ
1.How can I place an order for AT49F002NT-12JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002NT-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 AT49F002NT-12JC reliable?
The price and inventory of AT49F002NT-12JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002NT-12JC is usually 5 days.
3.What payment methods are accepted for AT49F002NT-12JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002NT-12JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002NT-12JC?
AT49F002NT-12JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002NT-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 AT49F002NT-12JC?
For technical support, including AT49F002NT-12JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002NT-12JC requirements.
6.How does Aetrix verify that AT49F002NT-12JC is sourced from the original manufacturer or authorized distributors?
All AT49F002NT-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 AT49F002NT-12JC meets industry standards.
7.What is the process for return or replacement of AT49F002NT-12JC?
All AT49F002NT-12JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002NT-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 AT49F002NT-12JC part is unused and in its original packaging.
Return procedure for AT49F002NT-12JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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