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Microchip Technology AT49F002-90JI
- Part No.:
- AT49F002-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002-90JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,350
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Product details
Overview
AT49F002-90JI from Atmel is a 2-Mbit (256K × 8) 5V-only in-system reprogrammable Flash memory IC used for nonvolatile code/data storage in embedded controllers and boot firmware applications. It delivers 90 ns read access time, supports byte-by-byte programming (10 µs/byte typical), features sector-based erase architecture (including 16K-byte boot block with lockout), and operates across industrial temperature range (–40°C to +85°C).
For engineers reviewing the AT49F002-90JI datasheet, AT49F002-90JI pinout, AT49F002-90JI application, or AT49F002-90JI equivalent, this page provides verified technical context, real-world use cases, validated alternatives, and supply-ready availability details specific to the PLCC-32 industrial-grade variant.
Technical Context
The AT49F002-90JI 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 architecture includes dedicated boot, parameter, and main memory blocks - each with independent erase capability and hardware data protection via VCC sense and noise filtering.
It uses Atmel's nonvolatile CMOS process to achieve 50 mA active current and 100 µA CMOS standby current, with DATA polling and toggle-bit methods for end-of-program/erase detection. The boot block lockout feature is software-enabled and irreversible under ≤5.5V, but override-capable via 12V on RESET - though this override is disabled in the N(T) variants (not applicable to AT49F002-90JI).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - sufficient for full boot loader + configuration data in microcontroller systems. |
| Read Access Time | 90 ns max - compatible with 11 MHz bus timing without wait states in industrial 8/16-bit microcontrollers. |
| Byte Programming Time | 10 µs typical - enables fast field updates of small firmware patches or calibration tables. |
| Erase Cycle Time | 10 seconds max for full chip or sector - supports in-system reprogramming without external programmers. |
| End-of-Operation Detection | DATA polling (I/O7 complement) and toggle-bit (I/O6 toggling) - eliminates need for fixed delay timers in host firmware. |
| Write Endurance | 10,000 program/erase cycles - validated for long-term reliability in firmware update cycles over product lifetime. |
| Operating Voltage | 5.0 V ±10% - single-supply operation simplifies power design versus mixed-voltage Flash devices. |
Pinout & Package
AT49F002-90JI is packaged in a 32-lead Plastic J-leaded Chip Carrier (PLCC-32), pin-compatible with industry-standard 32-pin Flash 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; A17 is MSB for 2Mbit capacity. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel data path for read, program, and identification operations; TTL/CMOS compatible. |
| 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 control; used with CE to prevent bus contention during shared-memory access. |
| WE | Write Enable | Active-low write strobe; latches address/data during command sequences and byte programming. |
| RESET | Reset Input | Active-low reset halts operations and forces high-Z outputs; 12V override enables boot block reprogramming (supported on AT49F002-90JI). |
| VCC / GND | Power Supply | 5V ±10% supply and ground pins; decoupling required within 1 cm for stable 90 ns read timing. |
| DC | No Connect | Pin 9 is unconnected - must be left floating or tied to ground per layout guidelines; not bonded internally. |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Operation | Eliminates need for 12V programming voltage or dual supplies - reduces BOM count and PCB complexity. |
| Sector Architecture | Enables selective erase of boot (16K), parameter (2×8K), or main memory (96K/128K) blocks - preserves critical firmware while updating application code. |
| Boot Block Lockout | Software-enabled permanent write protection for boot sector - prevents accidental corruption of startup code during field updates. |
| Hardware Data Protection | VCC sense (<3.8V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line interlock prevent spurious writes. |
| Industrial Temperature Range | Rated for –40°C to +85°C case temperature - qualified for deployment in automotive ECUs, industrial HMIs, and outdoor gateways. |
Applications
| Embedded Boot Memory | Firmware Update Storage |
|---|---|
Use Scenario: Storing primary bootloader and initialization code for ARM Cortex-M or 8051-based microcontrollers. IC Role / Device Role / Timing Role: Nonvolatile parallel Flash memory providing first-instruction fetch at power-on reset; 90 ns access ensures deterministic boot timing. Use Value: Boot block lockout guarantees integrity of secure startup code across 10,000+ field updates without risk of overwrite. | Use Scenario: Holding upgradable application firmware in programmable logic controllers (PLCs) and motor drives. IC Role / Device Role / Timing Role: In-system reprogrammable storage for field-deployed binaries; sector erase allows partial updates without full reflash. Use Value: 10-second sector erase and 10 µs/byte programming enable sub-minute firmware patching during maintenance windows. |
| Configuration Parameter Storage | Legacy System Code Replacement |
Use Scenario: Retaining calibrated sensor offsets, network settings, and user preferences in medical diagnostic equipment. IC Role / Device Role / Timing Role: Dual 8K parameter blocks serve as redundant, independently erasable NV storage for runtime-critical settings. Use Value: Independent sector erase avoids invalidating operational parameters when updating only calibration data. | Use Scenario: Direct replacement for obsolete 27C256 EPROMs in legacy industrial control panels with no PCB redesign. IC Role / Device Role / Timing Role: Pin- and function-compatible Flash drop-in substitute with identical DIP-32 or PLCC-32 footprint and parallel bus interface. Use Value: Eliminates UV erasers and socket programming; enables in-situ firmware upgrades using existing system-level programming infrastructure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV002BT-90EC | 3V core with 5V I/O; 90 ns read; 12V RESET not supported; no boot block lockout override. | Requires level-shifting for 5V-only systems; lacks 12V boot override - unsuitable where field recovery of locked boot code is required. | Select if migrating to 3.3V system architecture; verify RESET functionality compatibility before substitution. |
| SST39VF020-90-4C-NHE | 3.3V-only; 90 ns read; 10 µs/byte programming; no RESET pin; boot block protection implemented differently. | Not electrically compatible with 5V buses; missing RESET pin removes hardware recovery path for boot corruption. | Choose only for new 3.3V designs; requires board-level voltage translation and firmware adaptation for protection logic. |
Compared with AM29LV002BT-90EC and SST39VF020-90-4C-NHE, the AT49F002-90JI uniquely supports 5V-only operation with 12V RESET override - enabling guaranteed field recovery of locked boot sectors in industrial environments where firmware resilience is critical.
Availability
AT49F002-90JI is available at Aetrix Electronics and suitable for industrial control, embedded boot memory, and firmware update storage requiring stable component supply and long-term lifecycle support.
Supply support for AT49F002-90JI 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.
The AT49F002 product line was designed for cost-sensitive, 5V-based embedded systems needing reliable in-system reprogrammability - particularly for boot code storage and firmware field updates in industrial and automotive applications.
FAQ
What is the operating temperature range for the AT49F002-90JI?
The AT49F002-90JI is rated for industrial temperature operation from –40°C to +85°C (case temperature), making it suitable for deployment in harsh environments such as factory automation controllers, outdoor telemetry units, and vehicle-mounted electronics where thermal stability is essential. This rating is confirmed in the Ordering Information table on page 12 of the official datasheet.
Does the AT49F002-90JI support boot block reprogramming after lockout is enabled?
Yes - the AT49F002-90JI supports boot block reprogramming after lockout activation via a 12V ±0.5V signal applied to the RESET pin, as documented in the Boot Block Programming Lockout Override section. This feature is explicitly available on the AT49F002-90JI (non-N/T variant) and enables field recovery of corrupted boot code without device replacement.
What package type does the AT49F002-90JI use, and is pin 9 connected?
The AT49F002-90JI uses a 32-lead Plastic J-leaded Chip Carrier (PLCC-32) package, with pin 9 designated as "Don't Connect" (DC) - it is internally unconnected and must be left floating or grounded per layout guidance. This is specified in the Pin Configurations section and confirmed in the Ordering Information table on page 12.
How does the AT49F002-90JI detect completion of a byte programming cycle?
The AT49F002-90JI supports two hardware methods: DATA polling (reading the programmed address returns complemented data on I/O7 until completion) and toggle-bit detection (I/O6 toggles during programming and stabilizes upon completion). Both are usable at any time during the cycle and eliminate reliance on fixed timing delays in host firmware.
What is the maximum erase time for a full chip erase on the AT49F002-90JI?
The maximum full chip erase time for the AT49F002-90JI is 10 seconds, as specified in the Program Cycle Characteristics table on page 9 of the datasheet. This applies whether initiated via the six-byte software chip erase command or hardware reset sequence, and is internally timed without requiring external clocks or host intervention.
AT49F002-90JI 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:
- 90 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)
AT49F002-90JI FAQ
1.How can I place an order for AT49F002-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002-90JI 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 AT49F002-90JI reliable?
The price and inventory of AT49F002-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002-90JI is usually 5 days.
3.What payment methods are accepted for AT49F002-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002-90JI?
AT49F002-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002-90JI 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 AT49F002-90JI?
For technical support, including AT49F002-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002-90JI requirements.
6.How does Aetrix verify that AT49F002-90JI is sourced from the original manufacturer or authorized distributors?
All AT49F002-90JI 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 AT49F002-90JI meets industry standards.
7.What is the process for return or replacement of AT49F002-90JI?
All AT49F002-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002-90JI, 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 AT49F002-90JI part is unused and in its original packaging.
Return procedure for AT49F002-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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