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Microchip Technology AT49F002N-12JC
- Part No.:
- AT49F002N-12JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002N-12JC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49F002N-12JC from Atmel is a 5V-only, 2 Mbit (256K × 8) in-system reprogrammable Flash memory IC used for nonvolatile code/data storage in embedded controllers and boot memory applications. It features 55 ns read access time, 10 µs/byte typical programming, 10-second chip erase, sector-based architecture (16K-byte boot block + two 8K-byte parameter blocks + two main memory blocks), and hardware data protection with RESET pin support.
For engineers reviewing the AT49F002N-12JC datasheet, AT49F002N-12JC pinout, AT49F002N-12JC application, or AT49F002N-12JC equivalent, this page delivers verified specifications, PLCC-32 package layout, boot-block lockout behavior, DATA polling and toggle-bit status detection, and direct alternatives for industrial-grade 5V Flash replacement in legacy microcontroller systems.
Technical Context
The AT49F002N-12JC implements a command-register-based architecture requiring six-byte sequences for chip/sector erase and boot-lock enable, with internal timing eliminating external clocks. Its sector organization supports independent erasure of parameter blocks (8K × 2) and main memory blocks (96K + 128K), while the 16K boot block (00000H–03FFFH) supports permanent lockout via 12V RESET override - though that feature is disabled on the N(T) variant per documentation.
Operation relies on standard CE/OE/WE control logic identical to EPROMs, enabling drop-in compatibility in existing 8-bit bus systems. Hardware protection includes VCC sense (<3.8V inhibit), noise filtering (<15 ns pulse rejection), and multi-signal program inhibition (OE low, CE high, or WE high). DATA polling (I/O7 complement) and toggle-bit (I/O6) provide real-time program/erase completion feedback without polling overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - directly replaces 27C020 EPROMs in 8-bit address/data bus systems. |
| Read Access Time | 120 ns max (tACC), supporting 8.3 MHz bus operation - matches legacy microcontroller timing budgets without wait states. |
| Byte Programming Time | 10 µs typical (tBP), enabling fast field updates of small firmware patches without full reflash delays. |
| Erase Cycle Time | 10 seconds max (tEC) for full chip erase - deterministic internal timing eliminates need for external timers or watchdog supervision. |
| End-of-Program Detection | DATA polling (I/O7 complement) and toggle-bit (I/O6 toggling) - allows interrupt-driven status checking instead of fixed-delay polling loops. |
| Power Dissipation | 50 mA active current, 100 µA CMOS standby - suitable for low-power industrial systems with periodic firmware updates. |
| Endurance | 10,000 write/erase cycles - validated for long-term use in programmable logic controllers and instrumentation calibration storage. |
Pinout & Package
AT49F002N-12JC uses a 32-lead Plastic J-leaded Chip Carrier (PLCC-32) package, compliant with JEDEC MS-016 AE. Pin 1 is marked by index notch; pin 1 is DC (no connect) per datasheet note for DIP/PLCC variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus (00000H–3FFFFH); A0–A17 fully decoded for 256K-word addressing - no address multiplexing required. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path; supports byte-wide reads/writes and status polling without external latches or direction control. |
| CE | Chip Enable | Active-low chip select; enables device when low and OE low/WE high - prevents bus contention during shared-memory access. |
| OE | Output Enable | Active-low output gate; places I/O pins in high-Z when high - essential for multi-device bus arbitration. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence - defines all programming/erase operations. |
| RESET | Reset Control | Active-low reset input; halts ongoing operations and forces high-Z outputs - not used for boot-block override (disabled on N(T) variant). |
| VCC / GND | Power Supply | 5V ±10% supply (VCC) and ground (GND); decoupling required within 1 cm due to 50 mA active current transients. |
| DC | No Connect | Pin 1 is designated "Don't Connect" for PLCC and DIP packages - must remain unconnected per datasheet specification. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture | Independent 16K boot block (00000H–03FFFH), two 8K parameter blocks, and two main memory blocks (96K + 128K) - enables selective firmware updates without erasing secure boot code. |
| Boot Block Lockout | Software-enabled permanent write protection for boot sector; once activated, prevents accidental overwrite of critical startup code - verified via software ID mode at address 00002H. |
| Hardware Data Protection | VCC sense (<3.8V inhibit), noise filtering (<15 ns pulses ignored), and multi-signal program lockout - eliminates false writes from power glitches or EMI. |
| Command-Based Erase/Program | Standardized 4–6 cycle command sequences (e.g., 5555h/2AAAh/80h for erase) - eliminates need for external voltage generators or custom timing logic. |
| Status Feedback Mechanisms | Dual-mode detection: DATA polling (I/O7 complement) and toggle-bit (I/O6 toggling) - provides flexible, reliable end-of-operation signaling for real-time OS or bare-metal firmware. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot Memory |
|---|---|
Use Scenario: Storing firmware and configuration data in programmable logic controllers operating in harsh factory environments with wide temperature swings (-40°C to +85°C). IC Role / Device Role / Timing Role: Nonvolatile boot memory holding initialization code and runtime parameters; accessed during cold start and field updates via RS-232 or CAN. Use Value: 10,000-cycle endurance and 100 µA standby current ensure long service life with infrequent reprogramming; sector erase avoids full reflash downtime. |
Use Scenario: Replacing obsolete 27C020 EPROMs in 8-bit microcontroller-based test equipment where in-system reprogramming is required without removing the chip. IC Role / Device Role / Timing Role: Direct-bus-connected Flash memory mapped to CPU address space; operates with standard CE/OE/WE timing compatible with 8051/Z80 families. Use Value: 120 ns access time meets timing budgets of legacy controllers; PLCC-32 footprint allows drop-in replacement without PCB redesign. |
| Embedded Instrument Calibration Data | Secure Boot Loader Storage |
Use Scenario: Holding calibrated sensor coefficients and user-adjusted offsets in portable medical devices requiring traceable, tamper-resistant storage. IC Role / Device Role / Timing Role: Parameter block storage (8K × 2) for field-updatable calibration tables; accessed only during device self-test or service mode. Use Value: Independent sector erase allows updating calibration data without disturbing main application code; hardware protection prevents corruption during battery swaps. |
Use Scenario: Storing immutable boot loader code in networked edge devices where firmware integrity must be guaranteed across power cycles and remote updates. IC Role / Device Role / Timing Role: Boot block (16K) configured with lockout enabled; contains signed bootloader verified before loading application image from external SPI Flash. Use Value: Boot block lockout ensures bootloader remains intact even if main memory is corrupted; software detection at 00002H confirms protection status at runtime. |
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 | 3.3V operation, 90 ns access, 512K × 8 density; lacks boot-block lockout and RESET-based override. | Requires level-shifting for 5V systems; no hardware-protected boot sector - unsuitable where secure boot integrity is mandatory. | Select only if migrating to 3.3V design and boot protection is handled externally. |
| MX29LV040CTTI-90G | 3.3V core, 5V-tolerant I/O, 90 ns access, 512K × 8; supports CFI query but no dedicated boot block lockout command. | Compatible with mixed-voltage buses; however, boot protection requires external logic or firmware management - increases BOM and validation effort. | Prefer for new 3.3V designs needing CFI compliance; avoid for legacy 5V-only systems requiring hardware-enforced boot security. |
Compared with SST39VF020-90-4C-NHE and MX29LV040CTTI-90G, the AT49F002N-12JC delivers native 5V operation, deterministic 120 ns timing, and integrated boot-block lockout - making it uniquely suited for retrofitting industrial 8-bit systems where voltage compatibility and hardware-level firmware security are non-negotiable.
Availability
AT49F002N-12JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot memory, embedded instrument calibration data, and secure boot loader storage requiring stable component supply across extended product lifecycles.
Supply support for AT49F002N-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, Flash memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT49F002N series belongs to Atmel's 5V Flash memory product line, designed specifically for in-system reprogrammability in legacy 8-bit embedded systems requiring EPROM-compatible timing and robust data retention under industrial temperature conditions.
FAQ
What is the memory organization of the AT49F002N-12JC?
The AT49F002N-12JC contains 2 Mbit (262,144 × 8) of Flash memory, organized as 256K words × 8 bits. Its physical address space spans 00000H to 3FFFFH, partitioned into one 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (96K and 128K bytes). This structure enables selective erasure and programming without affecting protected regions.
Does the AT49F002N-12JC support boot block lockout, and how is it verified?
Yes, the AT49F002N-12JC supports boot block lockout via a six-cycle command sequence. Once enabled, the 16K boot block (00000H–03FFFH) becomes permanently write-protected at 5V. Verification is performed in Software Product Identification mode: reading address 00002H returns low on I/O0 if unlockable, high if locked. The AT49F002N-12JC does not support 12V RESET override - that feature is excluded from N(T) variants.
What package type and pin count does the AT49F002N-12JC use?
The AT49F002N-12JC uses a 32-lead Plastic J-leaded Chip Carrier (PLCC-32) package per JEDEC MS-016 AE. Pin 1 is identified by an index notch and is designated "Don't Connect" (DC) - it must remain unconnected. All other pins follow standard Flash memory functions: A0–A17 for addressing, I/O0–I/O7 for data, CE/OE/WE for control, RESET for reset, and VCC/GND for power.
How does the AT49F002N-12JC indicate completion of a program or erase cycle?
The AT49F002N-12JC provides two hardware-supported methods: DATA polling and toggle-bit detection. During programming, reading the last written byte returns the complement on I/O7 until completion; for erase or program, I/O6 toggles between 0 and 1 until finished. Both mechanisms eliminate the need for fixed delay loops and allow precise synchronization in real-time firmware.
Is the AT49F002N-12JC compatible with standard EPROM sockets and timing?
Yes, the AT49F002N-12JC is designed as a functional and pin-compatible replacement for 27C020 EPROMs. It uses identical CE/OE/WE control logic, 8-bit parallel data bus, and 18-bit address inputs. Its 120 ns access time meets or exceeds common EPROM timing requirements, enabling drop-in replacement in legacy 8-bit systems without changes to address decoding or bus timing logic.
AT49F002N-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)
AT49F002N-12JC FAQ
1.How can I place an order for AT49F002N-12JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002N-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 AT49F002N-12JC reliable?
The price and inventory of AT49F002N-12JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002N-12JC is usually 5 days.
3.What payment methods are accepted for AT49F002N-12JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002N-12JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002N-12JC?
AT49F002N-12JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002N-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 AT49F002N-12JC?
For technical support, including AT49F002N-12JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002N-12JC requirements.
6.How does Aetrix verify that AT49F002N-12JC is sourced from the original manufacturer or authorized distributors?
All AT49F002N-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 AT49F002N-12JC meets industry standards.
7.What is the process for return or replacement of AT49F002N-12JC?
All AT49F002N-12JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002N-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 AT49F002N-12JC part is unused and in its original packaging.
Return procedure for AT49F002N-12JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F002N-12JC Tags
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