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Microchip Technology AT49F002N-55JI
- Part No.:
- AT49F002N-55JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002N-55JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,973
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Product details
Overview
AT49F002N-55JI from Atmel is a 2-Mbit (256K × 8) 5V-only Flash memory IC used for nonvolatile program/data storage in embedded microcontroller systems. It delivers 55 ns read access time, supports byte-by-byte programming (10 µs/byte typical), features sector-based erase architecture (16K boot block + two 8K parameter blocks + two main memory blocks), and operates across -40°C to +85°C industrial temperature range.
For engineers reviewing the AT49F002N-55JI datasheet, AT49F002N-55JI pinout, AT49F002N-55JI application, or AT49F002N-55JI equivalent, this page provides verified technical context, validated pin functions, real-world use cases in firmware storage and configuration retention, and confirmed alternative parts with documented functional and packaging differences.
Technical Context
The AT49F002N-55JI implements a standard parallel Flash interface with CE/OE/WE control logic and RESET input, enabling EPROM-like read operation and command-driven programming/erase sequences. Its internal control logic handles autonomous sector erase timing and byte programming pulses without external clocks.
It uses a fixed 262,144-word × 8-bit organization with address pins A0–A17, I/O0–I/O7 bidirectional data bus, and hardware data protection via VCC sense (<3.8V inhibit), noise filtering (<15 ns pulse rejection), and control-line gating (OE low/CE high/WE high disables programming).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), sufficient for bootloader + configuration + firmware segments in 8-bit MCU systems |
| Read Access Time | 55 ns max - enables direct execution from Flash in systems with ≤18 MHz bus timing |
| Byte Programming Time | 10 µs typical - allows rapid field updates of small configuration tables without system interruption |
| Erase Cycle Time | 10 seconds max for full chip - supports in-system reprogramming during maintenance windows |
| End-of-Program Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delay timers in host firmware |
| Operating Voltage | 5V ±10% - compatible with legacy 5V logic families and avoids level-shifting complexity |
| Temperature Range | -40°C to +85°C - qualified for industrial control, automotive body electronics, and factory automation |
Pinout & Package
AT49F002N-55JI is packaged in a 32-lead Plastic J-leaded Chip Carrier (PLCC), pin-compatible with industry-standard 32J footprint. Pin 1 is marked by index notch; pin 9 is NC (no connect) per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A16 used for byte selection within 8-bit word |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface for read/write transfers; high-impedance when CE or OE is inactive |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access |
| OE | Output Enable | Active-low output gate; controls data bus drive to prevent bus contention during shared-memory access |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence timing |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-Z outputs; 12V override enables boot block reprogramming |
| VCC / GND | Power Supply | 5V supply (±10%) and ground; decoupling required near package due to 50 mA active current |
| DC | No Connect | Pin 9 is unconnected - must be left floating or tied to ground per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture | Independent 16K boot block (00000H–03FFFH), two 8K parameter blocks, and two main memory blocks (96K/128K) enable selective firmware update without erasing secure boot code |
| Boot Block Lockout | Hardware-enforced write protection for boot sector once enabled; prevents accidental corruption of startup code during field upgrades |
| Hardware Data Protection | VCC sense, noise filtering, and control-line gating eliminate spurious writes from power transients or EMI in noisy industrial environments |
| DATA Polling & Toggle Bit | Dual asynchronous end-of-program detection methods reduce host CPU overhead and simplify timing-critical firmware design |
| Single 5V Supply | Eliminates need for dedicated 12V programming voltage - simplifies power architecture and reduces BOM cost |
Applications
| Embedded Bootloader Storage | Firmware Configuration Retention |
|---|---|
Use Scenario: Storing immutable startup code in industrial PLCs where firmware integrity is critical during cold boot. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped to CPU reset vector; accessed at power-on with 55 ns latency. Use Value: Boot block lockout ensures bootloader remains unaltered across 10,000+ program cycles, preventing bricking during remote firmware updates. | Use Scenario: Holding calibration data and user preferences in medical diagnostic equipment requiring regulatory traceability. IC Role / Device Role / Timing Role: Parameter block storage accessed via MCU during initialization; erased/reprogrammed only during service mode. Use Value: Dedicated 8K parameter blocks allow atomic updates without disturbing main application code, meeting IEC 62304 data integrity requirements. |
| Legacy System Firmware Upgrade | Industrial HMI Display Memory |
Use Scenario: Field-upgrading firmware in deployed vending machines using RS-232-connected service tools. IC Role / Device Role / Timing Role: In-system reprogrammable Flash accessed via parallel bus; erased in sectors to minimize downtime. Use Value: 10-second erase and 10 µs/byte programming enable full firmware replacement in under 2 minutes, reducing service technician time. | Use Scenario: Storing localized UI assets (fonts, icons, language strings) in factory-floor HMIs exposed to wide temperature swings. IC Role / Device Role / Timing Role: Read-intensive memory mapped to display controller; accessed continuously during operation. Use Value: Industrial-grade -40°C to +85°C rating and 50 mA active current ensure reliable rendering across environmental extremes without thermal throttling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV002BT-55REI | 3V/5V dual-voltage operation; 55 ns access; 2 Mbit; PLCC-32; no RESET pin; boot block at top address (3C000H–3FFFFH) | Requires separate 3V supply rail; lacks 12V RESET override for boot block reprogramming | Select when migrating to lower-power 3V systems or when top-boot architecture better matches existing memory map |
| MX29LV002CTTI-55G | 3V-only operation; 55 ns access; 2 Mbit; TSOP-32; bottom-boot configuration; no hardware RESET input | Not pin-compatible (TSOP vs PLCC); incompatible voltage domain; no boot block lockout override capability | Choose for space-constrained designs needing surface-mount TSOP and where 3V system integration is mandatory |
Compared with AM29LV002BT-55REI and MX29LV002CTTI-55G, the AT49F002N-55JI uniquely combines 5V-only simplicity, industrial temperature rating, hardware RESET with 12V override, and bottom-boot lockout - making it optimal for legacy 5V embedded systems requiring field-serviceable secure boot.
Availability
AT49F002N-55JI is available at Aetrix Electronics and suitable for industrial control panels, medical device firmware storage, and automotive body electronics requiring stable component supply over extended production lifecycles.
Supply support for AT49F002N-55JI 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 mixed-signal ICs for embedded applications.
The AT49F002N series was designed as a drop-in EPROM replacement for 5V systems requiring in-system reprogrammability, targeting cost-sensitive industrial and consumer electronics with long-term reliability requirements.
FAQ
What is the boot block address range for AT49F002N-55JI?
The boot block for AT49F002N-55JI occupies addresses 00000H to 03FFFH (16 KB). This bottom-boot configuration is fixed for the AT49F002N variant, unlike the AT49F002T which uses a top-boot layout (3C000H–3FFFFH). The AT49F002N-55JI datasheet confirms this mapping in the Block Diagram and Command Definitions sections.
Does AT49F002N-55JI support 3V operation?
No, AT49F002N-55JI is a 5V-only Flash memory. It requires VCC = 5V ±10% and does not support 3V or dual-voltage operation. Attempting to operate below 4.5V will trigger the VCC sense protection circuit, inhibiting programming. This is explicitly stated in the DC Operating Range table and Features section of the AT49F002N-55JI datasheet.
How is boot block lockout overridden on AT49F002N-55JI?
Boot block lockout on AT49F002N-55JI is overridden by applying 12.0V ±0.5V to the RESET pin. This high-voltage signal temporarily disables the lockout, permitting chip erase, sector erase, or byte programming of the protected boot sector. After returning RESET to TTL levels, lockout reactivates. This feature is absent in the AT49F002N(T) variant.
What package type is used for AT49F002N-55JI?
AT49F002N-55JI uses a 32-lead Plastic J-leaded Chip Carrier (PLCC), designated as package code "32J". This is confirmed in the AT49F002N Ordering Information table, where "-55JI" suffix maps to industrial temperature grade and PLCC packaging. Pin 1 is identified by the index notch; pin 9 is NC (no connect).
Can AT49F002N-55JI be programmed without external high-voltage circuitry?
Yes, AT49F002N-55JI supports full 5V-only programming - no external 12V or 21V programming voltage is required. All command sequences (byte program, sector erase, chip erase) execute using standard 5V logic levels on CE, OE, WE, and address/data lines. This eliminates need for charge pumps or HV generators, simplifying system design versus older EPROM or EEPROM solutions.
AT49F002N-55JI 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:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49F002N-55JI FAQ
1.How can I place an order for AT49F002N-55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002N-55JI 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-55JI reliable?
The price and inventory of AT49F002N-55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002N-55JI is usually 5 days.
3.What payment methods are accepted for AT49F002N-55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002N-55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002N-55JI?
AT49F002N-55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002N-55JI 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-55JI?
For technical support, including AT49F002N-55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002N-55JI requirements.
6.How does Aetrix verify that AT49F002N-55JI is sourced from the original manufacturer or authorized distributors?
All AT49F002N-55JI 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-55JI meets industry standards.
7.What is the process for return or replacement of AT49F002N-55JI?
All AT49F002N-55JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002N-55JI, 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-55JI part is unused and in its original packaging.
Return procedure for AT49F002N-55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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