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Microchip Technology AT49F002-55JI
- Part No.:
- AT49F002-55JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002-55JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,522
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Product details
Overview
AT49F002-55JI from Atmel is a 2-Mbit (256K × 8) 5V-only in-system reprogrammable Flash memory IC with 55 ns read access time, 10 µs/byte typical programming time, 10-second erase cycle, and industrial temperature range (–40°C to +85°C). It features sector architecture including a 16K-byte boot block with programmable lockout, two 8K-byte parameter blocks, and two main memory blocks (96K/128K bytes), used for firmware storage and code execution in embedded controllers.
For engineers reviewing the AT49F002-55JI datasheet, AT49F002-55JI pinout, AT49F002-55JI application, or AT49F002-55JI equivalent, key selection criteria include industrial-grade reliability, byte-level reprogrammability without high-voltage programming, hardware data protection (VCC sense, noise filtering), DATA polling/Toggle Bit for operation status detection, and boot block write-protection for secure bootloader integrity.
Technical Context
The AT49F002-55JI implements a command-based Flash architecture requiring six-byte software sequences for chip/sector erase and boot lockout enable. Its internal program control logic handles timing autonomously-no external clocks needed for erase or programming-and supports standard microprocessor bus timing with CE/OE/WE control lines.
It uses a dual-line output enable scheme (CE and OE both low for valid read) to prevent bus contention, and integrates hardware safeguards: VCC sense inhibits programming below 3.8 V, and <15 ns input pulses on WE/CE are filtered out. The RESET pin enables system-level reset and-when driven to 12 V-overrides boot block lockout for recovery.
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 | 55 ns max - enables direct execution from Flash (XIP) in systems with ≤18 MHz bus clocks. |
| Byte Programming Time | 10 µs typical (50 µs max) - allows rapid field updates of configuration parameters or patch code without long delays. |
| Erase Cycle Time | 10 seconds max for full chip or sector - balances speed and endurance for infrequent but reliable firmware revision cycles. |
| Endurance | 10,000 program/erase cycles - validated for embedded applications requiring multi-year field update capability. |
| Operating Voltage | 5.0 V ±10% - single-supply compatibility with legacy 5V logic and microcontroller systems. |
| Temperature Range | –40°C to +85°C (industrial grade) - qualified for use in automotive ECUs, industrial PLCs, and outdoor networking equipment. |
| Standby Current | 100 µA CMOS standby - minimizes power in sleep modes for battery-backed or energy-sensitive designs. |
Pinout & Package
AT49F002-55JI is supplied in a 32-lead Plastic J-leaded Chip Carrier (PLCC) package (JEDEC MS-016 AE), with 1.27 mm pitch, 18.5 × 18.5 mm body, and lead finish Sn/Pb. Pin 1 is marked by index notch; pin 17 is RESET (12 V override capable); pins 1 and 9 are NC for PLCC variant per datasheet note.
| 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 for read/write operations; supports DATA polling on I/O7 and Toggle Bit on I/O6. |
| CE | Chip Enable | Active-low chip select; must be low with OE low for read, or low with WE low for command latching. |
| OE | Output Enable | Active-low output gate; used with CE for bus contention control and Toggle Bit monitoring. |
| WE | Write Enable | Active-low write strobe; falling edge latches address, rising edge latches data during command sequences. |
| RESET | Reset Input | Active-low system reset; at 12 V ±0.5 V enables boot block override - critical for firmware recovery. |
| VCC / GND | Power Supply | 5 V supply and ground; decoupling required within 10 mm of pins 16 (VCC) and 32 (GND) per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | 16K-byte boot sector (00000H–03FFFH) can be permanently write-protected via command sequence - ensures bootloader integrity across field updates. |
| Hardware Data Protection | VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulse rejection), and control-line interlock (OE low/CE high/WE high blocks writes) prevent accidental corruption. |
| DATA Polling & Toggle Bit | I/O7 complements last programmed byte until completion; I/O6 toggles during erase/program - eliminates need for timeout waits in host firmware. |
| Single 5V Operation | No external 12 V or 21 V programming voltage required - simplifies power design and enables true in-system reprogramming via standard logic-level signals. |
| Industrial Temperature Rating | –40°C to +85°C operation with 100 µA standby current - meets extended-range requirements for transportation, factory automation, and telecom infrastructure. |
| Command-Based Erase/Program | 6-byte software sequences (e.g., 5555H/AAH → 2AAAH/55H → 5555H/80H) initiate chip/sector erase or lockout - no dedicated programmer hardware needed. |
Applications
| Industrial PLC Firmware Storage | Automotive ECU Bootloader |
|---|---|
|
Use Scenario: Storing firmware images and calibration tables in programmable logic controllers deployed in factory environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-field update capability; 55 ns read access supports real-time instruction fetch from Flash. Use Value: Industrial temperature rating and 10,000-cycle endurance ensure multi-year reliability without replacement; boot block lockout prevents accidental overwrite of core runtime engine. |
Use Scenario: Hosting secure bootloader code in engine control units that require certified firmware validation before application code execution. IC Role / Device Role / Timing Role: Trusted boot memory with hardware-enforced write protection; RESET pin 12 V override enables recovery from corrupted boot sectors. Use Value: Boot block lockout (00000H–03FFFH) isolates bootloader from application updates; hardware VCC sense prevents spurious writes during brown-out conditions. |
| Networking Equipment Configuration | Medical Device Parameter Storage |
|
Use Scenario: Retaining device-specific configuration, MAC addresses, and security keys in Ethernet switches and wireless access points. IC Role / Device Role / Timing Role: Parameter block (two 8K-byte sections) stores user-modifiable settings; sector erase enables selective reconfiguration without full firmware reload. Use Value: Byte-programmability (10 µs/byte) allows rapid key updates; DATA polling eliminates fixed delay loops in host driver software. |
Use Scenario: Storing calibrated sensor offsets, usage logs, and regulatory compliance data in portable diagnostic instruments with battery backup. IC Role / Device Role / Timing Role: Low-power nonvolatile memory with 100 µA CMOS standby current - extends battery life during idle periods. Use Value: Hardware noise filtering and 10,000-cycle endurance meet IEC 60601-1 reliability requirements; industrial temp range accommodates sterilization cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV002BT-55EI | 3 V core with 5 V tolerant I/O; 55 ns access; 128K × 16 organization; no RESET pin override for boot protection. | Requires level-shifting for pure 5 V systems; lacks 12 V RESET override for boot recovery. | Choose for lower active power (30 mA vs. 50 mA) and 3 V system integration; avoid if 5 V-only interface or boot recovery is mandatory. |
| SST39VF020-55-4C-NHE | 3.3 V supply only; 55 ns access; 256K × 8; no hardware RESET override; Toggle Bit only (no DATA polling). | Not compatible with 5 V buses without translation; no 12 V recovery path for locked boot sectors. | Choose for cost-sensitive 3.3 V designs where boot block override is unnecessary; avoid for legacy 5 V industrial systems. |
Compared with AM29LV002BT-55EI and SST39VF020-55-4C-NHE, the AT49F002-55JI uniquely delivers 5 V-only operation with integrated 12 V RESET override for boot block recovery-critical for unattended field devices-while maintaining pin-compatible sector architecture and identical 256K × 8 organization.
Availability
AT49F002-55JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive ECU bootloader implementation, and medical device parameter retention requiring stable component supply across extended product lifecycles.
Supply support for AT49F002-55JI 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 secure authentication ICs for industrial, automotive, and consumer applications.
The AT49F002 series was designed as a drop-in EPROM-replacement Flash memory for 5 V embedded systems requiring in-system reprogrammability, robust data retention, and hardware-controlled boot protection-targeting legacy controller upgrades and long-lifecycle industrial equipment.
FAQ
What is the memory organization of the AT49F002-55JI?
The AT49F002-55JI contains 2 Mbit of Flash memory organized as 262,144 words × 8 bits (256K × 8). Its physical address space spans 00000H to 3FFFFH, partitioned into a 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (96K and 128K bytes). This structure is fixed for the AT49F002-55JI variant.
Does the AT49F002-55JI support in-system programming without high voltage?
Yes, the AT49F002-55JI supports full in-system reprogramming using only 5 V supply-no external 12 V or 21 V programming voltage is required. All commands (read, byte program, sector erase, boot lockout) are executed via standard 5 V logic-level signals applied to CE, OE, WE, and address/data pins, making it compatible with conventional microprocessor buses.
How does the boot block lockout feature work on the AT49F002-55JI?
The AT49F002-55JI's boot block lockout is enabled by a six-byte command sequence (5555H/AAH → 2AAAH/55H → 5555H/80H → 5555H/AAH → 2AAAH/55H → 5555H/40H). Once activated, the 16K-byte boot sector (00000H–03FFFH) becomes permanently write-protected at ≤5.5 V. The RESET pin at 12 V ±0.5 V overrides this protection for recovery.
What methods detect program/erase completion on the AT49F002-55JI?
The AT49F002-55JI provides two hardware methods: DATA polling (I/O7 returns complement of last loaded byte until completion, then true data) and Toggle Bit (I/O6 toggles between 0/1 during operation, stops when complete). Both allow host firmware to poll asynchronously without fixed timeouts-critical for deterministic real-time systems using the AT49F002-55JI.
Is the AT49F002-55JI pin-compatible with other AT49F002 variants?
Yes, all AT49F002 variants-including AT49F002-55JI, AT49F002-55JC, and AT49F002-55PI-share identical 32-pin PLCC, PDIP, TSOP, and VSOP footprints and pin functions. Differences are limited to operating temperature grade (industrial vs. commercial), access speed (55/70/90/120 ns), and package type-not pinout or electrical interface-ensuring direct PCB-level interchangeability for the AT49F002-55JI.
AT49F002-55JI 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)
AT49F002-55JI FAQ
1.How can I place an order for AT49F002-55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002-55JI 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 AT49F002-55JI reliable?
The price and inventory of AT49F002-55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002-55JI is usually 5 days.
3.What payment methods are accepted for AT49F002-55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002-55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002-55JI?
AT49F002-55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002-55JI 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 AT49F002-55JI?
For technical support, including AT49F002-55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002-55JI requirements.
6.How does Aetrix verify that AT49F002-55JI is sourced from the original manufacturer or authorized distributors?
All AT49F002-55JI 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 AT49F002-55JI meets industry standards.
7.What is the process for return or replacement of AT49F002-55JI?
All AT49F002-55JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002-55JI, 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 AT49F002-55JI part is unused and in its original packaging.
Return procedure for AT49F002-55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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