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Microchip Technology AT49F002AN-55JU
- Part No.:
- AT49F002AN-55JU
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002AN-55JU.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,304
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Product details
Overview
AT49F002AN-55JU from Microchip (formerly Atmel) is a 2-Mbit (256K × 8) 5V-only in-system reprogrammable Flash memory IC used for nonvolatile code and data storage in embedded microcontroller systems. It delivers 55 ns read access time, 20 µs/byte programming, 4-second chip erase, 10,000 write cycles, and features hardware data protection with boot block lockout for secure firmware storage.
For engineers reviewing the AT49F002AN-55JU datasheet, AT49F002AN-55JU pinout, AT49F002AN-55JU application, or AT49F002AN-55JU equivalent, this page provides verified technical context, sector architecture details, DC/AC timing specs, PLCC-32 package mapping, and real-world use cases in industrial control, BIOS storage, and legacy system upgrades where 5V-only operation and boot-sector integrity are required.
Technical Context
The AT49F002AN-55JU implements a sector-erasable Flash architecture with one 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks, and four main memory blocks (32K + 3×64K). Its command-set-driven operation uses standard CE/OE/WE controls and requires no high-voltage programming inputs.
It supports DATA polling (I/O7 complement) and toggle-bit detection (I/O6) for end-of-program/erase verification, and includes VCC sense (<3.8V inhibit), noise filtering (<15 ns pulse rejection), and RESET-based boot block override (not available on AN variant). The PLCC-32 package has Pin 1 as NC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (256K × 8), organized for byte-wide parallel access in 5V systems |
| Read Access Time | 55 ns - enables direct replacement of EPROMs in legacy 5V bus interfaces without wait states |
| Byte Programming Time | 20 µs typical - allows rapid field updates of small firmware patches or configuration data |
| Chip Erase Time | 4 seconds max - supports full reprogramming within tight production test windows |
| Endurance | 10,000 program/erase cycles - validated for long-term use in industrial firmware update scenarios |
| Power Dissipation | 30 mA active / 100 µA CMOS standby - suitable for low-power industrial controllers with intermittent operation |
| Operating Voltage | 5V ±10% - eliminates need for auxiliary voltage rails in legacy 5V designs |
Pinout & Package
AT49F002AN-55JU is housed in a 32-lead Plastic J-Leaded Chip Carrier (PLCC) package per JEDEC MS-016 AE. Pin 1 is No Connect (NC); all other pins follow standard Flash interface mapping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing (00000H–3FFFFH) |
| I/O0–I/O7 | Data Inputs/Outputs | Bi-directional 8-bit data bus compatible with standard microprocessor data buses |
| CE | Chip Enable | Active-low chip select; must be low with OE low for valid read access |
| OE | Output Enable | Active-low output control; used with CE to prevent bus contention during reads |
| WE | Write Enable | Active-low signal initiating byte programming, sector erase, or command loading |
| RESET | Reset Input | Halts ongoing operations and forces high-Z outputs; 12V override not supported on AN variant |
| VCC | Power Supply | +5V ±10% supply; internal VCC sense disables programming if below 3.8V |
| GND | Ground | Reference return path for all signals and power; decoupling required per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Single 5V Supply Operation | Eliminates need for 12V programming voltage, simplifying power design and enabling in-system reprogramming via standard logic-level signals |
| Boot Block Programming Lockout | 16K-byte protected region (00000H–03FFFH) prevents accidental overwrite of critical boot code once enabled via command sequence |
| Hardware Data Protection | Combines VCC sensing, WE/CE/OE state monitoring, and noise filtering to prevent spurious writes during power transients or EMI events |
| DATA Polling & Toggle Bit | Dual software-detectable completion methods (I/O7 complement and I/O6 toggling) enable robust firmware-controlled timing without external clocks or timers |
| Green Pb/Halide-Free Packaging | Meets RoHS Directive 2011/65/EU requirements; JU suffix confirms lead-free PLCC-32 construction |
Applications
| Industrial Control Firmware Storage | Legacy PC BIOS Replacement |
|---|---|
Use Scenario: Storing firmware for programmable logic controllers (PLCs) operating in extended temperature environments (-40°C to +85°C). IC Role / Device Role / Timing Role: Nonvolatile code storage with fast 55 ns read access to support deterministic real-time execution from memory-mapped I/O space. Use Value: Boot block lockout ensures bootloader integrity across 10,000+ field updates, while 5V-only operation avoids dual-rail power design complexity. | Use Scenario: Replacing obsolete 27C020 EPROMs in industrial motherboards requiring BIOS updates without socket removal. IC Role / Device Role / Timing Role: Drop-in Flash memory providing identical pinout and timing to EPROMs but with in-system reprogrammability. Use Value: 20 µs/byte programming enables rapid BIOS patch deployment; sector erase allows selective parameter block updates without disturbing boot code. |
| Embedded System Configuration Memory | Telecom Equipment Parameter Storage |
Use Scenario: Holding calibration data, device IDs, and user-configurable settings in medical diagnostic instruments. IC Role / Device Role / Timing Role: Persistent parameter storage with hardware write protection to prevent corruption during brown-out conditions. Use Value: 100 µA CMOS standby current extends battery backup life; DATA polling ensures reliable write confirmation in safety-critical applications. | Use Scenario: Storing protocol stacks and line-card configuration profiles in legacy telecom access equipment. IC Role / Device Role / Timing Role: Sector-erasable nonvolatile memory supporting independent updates of parameter blocks (8K × 2) and main firmware regions. Use Value: Four main memory blocks (32K + 3×64K) allow modular firmware partitioning; 4-second chip erase enables full field reflash within maintenance windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002A-55JI | Same die, standard (non-RoHS) PLCC-32 packaging; no Pb/halide-free compliance | Acceptable where RoHS exemption applies or legacy procurement mandates SnPb finish | Select only if environmental compliance is not required and existing inventory uses JI suffix |
| SST39VF020-55-4C-NHE | 4M-bit density, 3.3V core with 5V I/O tolerance; 70 ns read; different command set and sector map | Requires voltage translation and firmware adaptation; not pin-compatible | Consider only for new designs needing higher density and lower voltage operation, not as drop-in replacement |
Compared with AT49F002AN-55JU, AT49F002A-55JI offers identical functionality without RoHS compliance, while SST39VF020 demands board-level redesign due to voltage and command incompatibility-neither qualifies as pin-compatible, making AT49F002AN-55JU irreplaceable in legacy 5V systems requiring certified green packaging.
Availability
AT49F002AN-55JU is available at Aetrix Electronics and suitable for industrial control firmware storage, legacy BIOS replacement, and embedded configuration memory requiring stable component supply over extended product lifecycles.
Supply support for AT49F002AN-55JU 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
Microchip Technology acquired Atmel in 2016 and maintains full support for legacy Atmel Flash products including the AT49F series.
The AT49F002A family was designed specifically for 5V-only embedded systems needing in-system reprogrammability, boot-sector protection, and EPROM-compatible timing-targeting industrial, telecom, and computing applications where reliability and long-term availability are critical.
FAQ
What is the function of Pin 1 on the AT49F002AN-55JU PLCC package?
Pin 1 on the AT49F002AN-55JU is a No Connect (NC) terminal, as explicitly stated in the datasheet for the AT49F002AN(T) variant. This pin serves no electrical function and must remain unconnected in PCB layout. Its presence aligns with PLCC-32 mechanical indexing but carries no signal, power, or ground role in the AT49F002AN-55JU device operation.
Does the AT49F002AN-55JU support boot block reprogramming after lockout is enabled?
No, the AT49F002AN-55JU does not support boot block reprogramming after lockout is enabled. Unlike the AT49F002A(N)T variant, the AT49F002AN-55JU lacks the 12V RESET override feature. Once the boot block lockout command sequence is executed, the 16K-byte region (00000H–03FFFH) becomes permanently write-protected under standard 5V operation, ensuring firmware integrity in deployed systems.
How is end-of-program detection implemented in the AT49F002AN-55JU?
The AT49F002AN-55JU implements end-of-program detection using DATA polling on I/O7: during programming, reading the last written byte returns its complement until completion, then true data appears. Alternatively, I/O6 toggles between 0 and 1 during active programming and stabilizes upon completion. Both methods are software-pollable and require no external timing components, enabling deterministic firmware control of write sequences in the AT49F002AN-55JU.
What is the maximum allowable erase time for the AT49F002AN-55JU?
The maximum allowable erase time for the AT49F002AN-55JU is 8 seconds for full chip erase, as specified in the tEC parameter (Erase Cycle Time). This value represents the worst-case duration under industrial temperature conditions (-40°C to +85°C) and accounts for process variation. Typical erase time is 4 seconds, but firmware must accommodate the 8-second upper limit to ensure robust operation across all units and environmental conditions of the AT49F002AN-55JU.
Is the AT49F002AN-55JU compatible with standard EPROM programmers?
The AT49F002AN-55JU is not directly compatible with standard EPROM programmers due to its command-set-driven architecture and lack of high-voltage programming inputs. While it shares the same PLCC-32 footprint and 5V interface as many EPROMs, programming requires specific six-cycle command sequences (e.g., 555H/AAH, AAH/55H, etc.) loaded via CE/WE control-not UV erasure or VPP pulses. Dedicated Flash programmers supporting Atmel's AT49F protocol are required for reliable AT49F002AN-55JU programming.
AT49F002AN-55JU 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)
AT49F002AN-55JU FAQ
1.How can I place an order for AT49F002AN-55JU through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002AN-55JU 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 AT49F002AN-55JU reliable?
The price and inventory of AT49F002AN-55JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002AN-55JU is usually 5 days.
3.What payment methods are accepted for AT49F002AN-55JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002AN-55JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002AN-55JU?
AT49F002AN-55JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002AN-55JU 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 AT49F002AN-55JU?
For technical support, including AT49F002AN-55JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002AN-55JU requirements.
6.How does Aetrix verify that AT49F002AN-55JU is sourced from the original manufacturer or authorized distributors?
All AT49F002AN-55JU 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 AT49F002AN-55JU meets industry standards.
7.What is the process for return or replacement of AT49F002AN-55JU?
All AT49F002AN-55JU units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002AN-55JU, 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 AT49F002AN-55JU part is unused and in its original packaging.
Return procedure for AT49F002AN-55JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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