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Microchip Technology AT49F002A-55JI
- Part No.:
- AT49F002A-55JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002A-55JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,335
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Product details
Overview
AT49F002A-55JI from Atmel is a 2 Mbit (256K × 8) 5V-only in-system reprogrammable Flash memory with 55 ns read access time, 20 µs/byte programming, and sector-based erase architecture including one 16K-byte boot block with programmable lockout. It operates across the industrial temperature range (–40°C to +85°C) and delivers 30 mA active current with 100 µA CMOS standby current, targeting embedded firmware storage in microcontroller-based systems.
For engineers reviewing the AT49F002A-55JI datasheet, AT49F002A-55JI pinout, AT49F002A-55JI application, or AT49F002A-55JI equivalent, key selection considerations include its single-voltage 5V operation, boot-block hardware protection, DATA polling/toggle-bit program/erase status detection, and PLCC-32 packaging for legacy board compatibility.
Technical Context
The AT49F002A-55JI implements a standard parallel Flash interface with CE/OE/WE control logic, supporting EPROM-like read timing and command-based byte programming and sector erasure. Its internal program control logic eliminates external high-voltage requirements, enabling in-system reprogramming using only 5V.
Memory organization comprises one 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks, and four main memory blocks (32K + 3×64K bytes). Boot block lockout-enabled via six-cycle command sequence-permanently prevents reprogramming at ≤5.5V, while RESET-pin override (12V) allows recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), directly replaces EPROMs in 8-bit bus systems without data width conversion |
| Read Access Time | 55 ns - enables direct connection to 12–15 MHz microcontrollers without wait states |
| Byte Programming Time | 20 µs typical - supports fast field updates of small firmware patches or configuration data |
| Erase Cycle Time | 4 seconds max chip erase - balances speed and reliability for production programming and field recovery |
| End-of-Operation Detection | DATA polling (I/O7 complement) and toggle bit (I/O6) - eliminates need for fixed delay timers in host firmware |
| Power Dissipation | 165 mW active (30 mA @ 5.5V), 0.5 mW standby (100 µA) - suitable for low-power industrial controllers |
| Endurance | 10,000 write/erase cycles - validated for firmware update cycles over 5+ year product lifetimes |
Pinout & Package
AT49F002A-55JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), compliant with JEDEC MS-016 Variation AE, with body dimensions 12.5 mm × 12.5 mm × 3.5 mm and lead coplanarity ≤0.102 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A11 is don't-care in command cycles |
| I/O0–I/O7 | Data Inputs/Outputs | Bi-directional 8-bit data bus; I/O7 used for DATA polling, I/O6 for toggle-bit status monitoring |
| CE | Chip Enable | Active-low chip select; must be low with OE low for read, high to enter standby (100 µA) |
| OE | Output Enable | Active-low output gate; controls data bus tristate to prevent contention during shared-bus operation |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command cycle timing |
| RESET | Reset Control | Active-low reset; 12V input overrides boot block lockout - critical for secure firmware recovery |
| VCC / GND | Power Supply | 5V ±10% supply; VCC sense circuitry disables programming if voltage drops below 3.8V |
Key Features
| Feature | Design Value |
|---|---|
| Single-Voltage 5V Operation | Eliminates need for 12V programming supplies or charge pumps - simplifies power design and PCB layout |
| Boot Block Programming Lockout | Hardware-enforced write protection for 16K-byte boot code region - prevents accidental corruption of bootloader |
| Sector Erase Architecture | Independent erase of boot block, two parameter blocks, and four main memory blocks - enables granular firmware updates |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns pulses rejected), and control-line inhibit (OE low/CE high/WE high) - prevents spurious writes in noisy environments |
| Green Packaging Option | Pb/Halide-free PLCC variant available - meets RoHS compliance requirements for industrial shipments |
Applications
| Industrial PLC Firmware Storage | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Storing boot loader and application firmware in programmable logic controllers with field-upgrade capability. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped to microcontroller address space; 55 ns access ensures real-time response during startup and diagnostics. Use Value: Boot block lockout guarantees bootloader integrity across 10,000+ field updates, reducing risk of bricking deployed units. | Use Scenario: Holding calibration data and control algorithms in automotive BCMs requiring ASIL-B compatible update resilience. IC Role / Device Role / Timing Role: Parameter block storage for EEPROM-like configuration variables; sector erase enables safe over-the-air (OTA) updates without full flash reprogramming. Use Value: 4-second chip erase and DATA polling allow deterministic update windows within vehicle CAN bus diagnostic sessions. |
| Medical Device Boot Image | Legacy Industrial HMI Controller |
Use Scenario: Secure storage of certified boot image in FDA-cleared patient monitoring equipment with regulatory traceability requirements. IC Role / Device Role / Timing Role: Read-only boot memory during power-on self-test; RESET-pin 12V override enables authorized recovery after failed update. Use Value: Hardware lockout + 12V override satisfies IEC 62304 software lifecycle requirements for safe firmware recovery paths. | Use Scenario: Replacing obsolete 27C020 EPROMs in aging human-machine interface controllers with in-system reprogrammability. IC Role / Device Role / Timing Role: Drop-in parallel Flash replacement; identical pinout and timing (55 ns) avoids PCB redesign. Use Value: PLCC-32 package and EPROM-compatible CE/OE/WE interface enable seamless retrofit into existing 1990s-era industrial panels. |
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 | 3V/5V dual-voltage operation; 55 ns access; 16K boot sector; no RESET-pin override | Lacks 12V boot block override; requires separate 3V supply rail for low-power mode | Select when system already supports 3V I/O and boot security relies on software-only lock mechanisms |
| SST39VF020-55-4C-NHE | 5V-only; 55 ns access; 8K boot sector; no hardware boot lockout; uses different command set | Smaller boot sector; no permanent lockout - relies on software write-protection flags vulnerable to corruption | Select when cost sensitivity outweighs boot integrity requirements and firmware update frequency is low |
Compared with AM29LV002BT-55EI and SST39VF020-55-4C-NHE, the AT49F002A-55JI uniquely combines 5V-only simplicity, hardware-enforced boot lockout, and 12V RESET override - making it optimal for safety-critical legacy industrial upgrades where bootloader immutability and field recovery are mandatory.
Availability
AT49F002A-55JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive body control modules, medical device boot image retention, and legacy HMI controller retrofits requiring stable component supply and long-term obsolescence management.
Supply support for AT49F002A-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 fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT49F002A-55JI belongs to Atmel's parallel Flash memory product line, designed specifically for in-system reprogrammability in resource-constrained embedded systems requiring robust firmware storage with hardware-level boot protection.
FAQ
What is the operating temperature range for the AT49F002A-55JI?
The AT49F002A-55JI is rated for industrial temperature operation from –40°C to +85°C. This range is validated across all DC and AC specifications including 55 ns read access, 20 µs byte programming, and 4-second erase cycles. The device maintains 100 µA standby current and reliable DATA polling functionality across this full range, making it suitable for deployment in uncontrolled environmental enclosures.
Does the AT49F002A-55JI require external high-voltage programming signals?
No, the AT49F002A-55JI operates exclusively at 5V for both read and reprogramming functions. Its internal charge pump and command decoder eliminate the need for 12V or higher programming voltages. All operations - including byte programming, sector erase, and chip erase - are initiated via standardized 5V command sequences written to specific address/data locations, simplifying system-level power design.
How is boot block protection implemented in the AT49F002A-55JI?
The AT49F002A-55JI implements hardware-based boot block protection through a six-cycle command sequence that permanently disables programming and erasure of the 16K-byte boot sector (00000H–03FFFH) at input voltages ≤5.5V. Once enabled, protection cannot be reversed except by applying 12V to the RESET pin - a feature confirmed in the datasheet for the AT49F002A-55JI PLCC variant.
What package type does the AT49F002A-55JI use, and is it pin-compatible with other variants?
The AT49F002A-55JI uses a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32) package per JEDEC MS-016 Variation AE. It shares identical pinout and signal mapping with AT49F002A-55TI (TSOP) and AT49F002A-55VI (VSOP), differing only in mechanical form factor - enabling drop-in replacement on PLCC-footprinted boards without electrical or logical changes.
Can the AT49F002A-55JI be used as a direct replacement for EPROMs like the 27C020?
Yes, the AT49F002A-55JI is functionally and pinout-compatible with 27C020 EPROMs in PLCC-32 packages. It matches the 256K × 8 organization, 55 ns access time, and CE/OE/WE control interface. Unlike EPROMs, it requires no UV erasure and supports in-system reprogramming - enabling field firmware updates without socket removal or UV chamber dependency.
AT49F002A-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)
AT49F002A-55JI FAQ
1.How can I place an order for AT49F002A-55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002A-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 AT49F002A-55JI reliable?
The price and inventory of AT49F002A-55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002A-55JI is usually 5 days.
3.What payment methods are accepted for AT49F002A-55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002A-55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002A-55JI?
AT49F002A-55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002A-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 AT49F002A-55JI?
For technical support, including AT49F002A-55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002A-55JI requirements.
6.How does Aetrix verify that AT49F002A-55JI is sourced from the original manufacturer or authorized distributors?
All AT49F002A-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 AT49F002A-55JI meets industry standards.
7.What is the process for return or replacement of AT49F002A-55JI?
All AT49F002A-55JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002A-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 AT49F002A-55JI part is unused and in its original packaging.
Return procedure for AT49F002A-55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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