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Microchip Technology AT49F002N-70JI
- Part No.:
- AT49F002N-70JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002N-70JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49F002N-70JI from Atmel is a 2-Mbit (256K × 8) 5V-only in-system reprogrammable Flash memory IC with 70 ns read access time, 10 µs typical byte programming, 10-second erase cycle, and sector architecture including a 16K-byte boot block with programmable lockout. It operates across industrial temperature range (–40°C to +85°C) and supports standard CE/OE/WE control for EPROM-compatible read and Flash-specific program/erase operations in embedded firmware storage applications.
For engineers reviewing the AT49F002N-70JI datasheet, AT49F002N-70JI pinout, AT49F002N-70JI application, or AT49F002N-70JI equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in boot code and parameter storage, and two confirmed alternative parts with documented functional and architectural differences.
Technical Context
The AT49F002N-70JI implements a sector-erasable Flash architecture with one 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (96K and 128K bytes). Its command interface uses six-cycle sequences for chip/sector erase and four-cycle sequences for byte programming, all executed via standard microprocessor timing on CE/WE/OE control lines.
Hardware data protection includes VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and active-level control inhibition (OE low, CE high, or WE high blocks writes). DATA polling (I/O7 complement) and toggle-bit (I/O6) mechanisms provide reliable end-of-program/erase detection without external clocks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - directly maps to 8-bit microcontroller data bus with no address decoding overhead. |
| Read Access Time | 70 ns max - enables direct execution from Flash in systems with ≤14 MHz bus clock without wait states. |
| Byte Programming Time | 10 µs typical - supports real-time field updates of configuration parameters without system interruption. |
| Erase Cycle Time | 10 seconds max for full chip - allows predictable firmware update windows in industrial controllers. |
| Endurance | 10,000 write/erase cycles - validated for firmware revision management over 5+ years in deployed equipment. |
| Operating Voltage | 5.0 V ±10% - compatible with legacy 5V logic families and eliminates need for voltage translators. |
| Temperature Range | –40°C to +85°C - qualified for industrial automation, motor drives, and outdoor embedded systems. |
Pinout & Package
AT49F002N-70JI 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 (do not connect).
| 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 data path. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; latched on rising edge of CE/WE during programming, tri-stated when CE or OE high. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read; controls address latching timing in command sequences. |
| OE | Output Enable | Active-low output control; enables data output only when CE is also low; prevents bus contention in shared-memory systems. |
| WE | Write Enable | Active-low write control; initiates command loading on falling edge; latches data on rising edge during programming/erase cycles. |
| RESET | Reset Input | Active-low hardware reset; forces outputs to high-Z; 12 V override enables boot block reprogramming even when lockout is active (not available on AT49F002N(T)). |
| GND / VCC | Power Supply | Single 5V supply; CMOS standby current <100 µA ensures low-power operation in sleep modes. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Programming Lockout | 16K-byte region (00000H–03FFFH) permanently protected after command sequence - secures bootloader integrity against accidental overwrite. |
| DATA Polling & Toggle Bit | I/O7 complement and I/O6 toggling provide software-controlled, clockless program/erase completion detection - eliminates need for fixed delay timers in host firmware. |
| Sector Erase Flexibility | Independent erasure of two 8K parameter blocks and two main memory blocks - enables selective firmware patching without full chip erase. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line inhibition prevent spurious writes during power transients or EMI events - critical for field-reliable updates. |
| 5V-Only Operation | No external high-voltage programming supply required - simplifies PCB design and reduces BOM count versus older EPROM/EEPROM solutions. |
Applications
| Industrial PLC Firmware Storage | Embedded Bootloader Memory |
|---|---|
Use Scenario: Storing firmware images and runtime configuration tables in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile program memory with 70 ns read access enabling direct code execution; sector erase supports modular firmware updates without full reload. Use Value: 10,000-cycle endurance and –40°C to +85°C rating ensure multi-year reliability; boot block lockout prevents corruption of safety-critical startup routines. |
Use Scenario: Hosting secure boot code in microcontroller-based medical devices requiring tamper-resistant initialization sequences before application code loads. IC Role / Device Role / Timing Role: Dedicated boot memory with hardware-enforced write protection; RESET-pin 12 V override allows authorized recovery if lockout is prematurely enabled. Use Value: 16K-byte boot block (00000H–03FFFH) provides ample space for cryptographic verification and secure boot loaders; 5V-only operation integrates cleanly with 5V MCU power domains. |
| Automotive Diagnostic Module Storage | Telecom Parameter Configuration |
Use Scenario: Storing calibration data and diagnostic fault logs in OBD-II modules exposed to automotive under-hood thermal cycling and load-dump transients. IC Role / Device Role / Timing Role: Parameter memory with two independent 8K-byte blocks - one stores sensor calibration coefficients, the other retains fault history with wear-leveling via sector rotation. Use Value: Hardware VCC sense (<3.8 V inhibits writes) prevents corruption during brown-out conditions; 100 µA standby current extends battery life in always-on modules. |
Use Scenario: Holding network configuration profiles (IP settings, protocol stacks) in DSL modems where field-upgradable parameters must persist across power cycles. IC Role / Device Role / Timing Role: Field-programmable parameter memory using byte-by-byte programming (10 µs/byte) - enables rapid, low-overhead updates during firmware OTA sessions. Use Value: Sector architecture isolates parameter updates from main firmware; DATA polling allows deterministic update timing without fixed delays or external status pins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV002BT-70EC | 3V core with 5V I/O tolerance; 70 ns read; 128K × 16 organization; requires VPP = 12 V for programming. | Requires level-shifting for pure 5V systems; larger word width increases address decoding complexity. | Select only if migrating to 3V core architecture; not drop-in for 5V-only designs. |
| SST39VF020-70-4C-NHE | 3.3V supply; 70 ns read; 256K × 8; single-power 3.3V programming; no RESET pin or boot block lockout. | Lacks hardware boot protection and 12 V override; incompatible with 5V bus interfaces without translation. | Choose for new 3.3V designs prioritizing lower power; avoid when boot security or 5V compatibility is mandatory. |
Compared with AM29LV002BT-70EC and SST39VF020-70-4C-NHE, the AT49F002N-70JI delivers true 5V-only operation, integrated boot block lockout with 12 V recovery, and proven industrial temperature reliability - making it the sole option for legacy 5V systems requiring field-upgradable secure boot code.
Availability
AT49F002N-70JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded bootloader memory, and telecom parameter configuration requiring stable component supply, long-term lifecycle support, and guaranteed industrial-grade qualification.
Supply support for AT49F002N-70JI 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 5V embedded systems requiring robust boot code protection and field-upgradable firmware storage.
FAQ
What is the memory organization and density of the AT49F002N-70JI?
The AT49F002N-70JI contains 2 Mbit (262,144 × 8) of Flash memory, organized as 256K words × 8 bits. This matches standard 8-bit microcontroller data buses and supports direct addressing without multiplexing. The physical layout includes a 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (96K and 128K bytes), as confirmed in the device datasheet section "Block Diagram" and "Sector Architecture".
Does the AT49F002N-70JI support hardware boot block protection, and how is it activated?
Yes, the AT49F002N-70JI supports hardware boot block programming lockout for its 16K-byte boot sector (00000H–03FFFH). Activation requires a six-cycle command sequence: load AAH to 5555H, 55H to 2AAAH, then 40H to 5555H. Once enabled, the boot block cannot be erased or programmed at ≤5.5 V. The AT49F002N-70JI datasheet confirms RESET pin 12 V override capability for authorized recovery - a feature absent in AT49F002N(T) variants.
What are the valid operating temperature and supply voltage ranges for the AT49F002N-70JI?
The AT49F002N-70JI is rated for industrial temperature operation from –40°C to +85°C and requires a 5.0 V ±10% supply (4.5 V to 5.5 V). These specifications are explicitly defined in the "DC and AC Operating Range" table of the datasheet, where the "-70JI" suffix denotes 70 ns access time and industrial temperature grade. Standby current remains below 100 µA across this full range, ensuring low-power operation in thermally demanding environments.
How does the AT49F002N-70JI detect completion of programming or erase operations?
The AT49F002N-70JI provides two hardware-supported methods: DATA polling (I/O7 returns complement of loaded data until completion, then true data) and Toggle Bit (I/O6 toggles between 0 and 1 during operation, then stabilizes). Both are usable at any time during the cycle and require no external clocks. These mechanisms are detailed in the "DATA POLLING" and "TOGGLE BIT" sections of the datasheet, with timing parameters characterized for the -70 speed grade.
Is the AT49F002N-70JI pin-compatible with other packages in the AT49F002N family?
Yes, the AT49F002N-70JI uses the 32-lead PLCC (32J) package, which shares identical pinout and signal mapping with other AT49F002N variants in PDIP (32P6), TSOP (32T), and VSOP (32V) packages. Pin functions - including A0–A17, I/O0–I/O7, CE, OE, WE, RESET, GND, and VCC - are consistent across all packages per the "Pin Configurations" diagrams. However, pin 9 is NC in PLCC/PDIP but connected in TSOP/VSOP, so board layout must observe package-specific notes.
AT49F002N-70JI 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:
- 70 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-70JI FAQ
1.How can I place an order for AT49F002N-70JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002N-70JI 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-70JI reliable?
The price and inventory of AT49F002N-70JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002N-70JI is usually 5 days.
3.What payment methods are accepted for AT49F002N-70JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002N-70JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002N-70JI?
AT49F002N-70JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002N-70JI 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-70JI?
For technical support, including AT49F002N-70JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002N-70JI requirements.
6.How does Aetrix verify that AT49F002N-70JI is sourced from the original manufacturer or authorized distributors?
All AT49F002N-70JI 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-70JI meets industry standards.
7.What is the process for return or replacement of AT49F002N-70JI?
All AT49F002N-70JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002N-70JI, 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-70JI part is unused and in its original packaging.
Return procedure for AT49F002N-70JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F002N-70JI Tags
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