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Microchip Technology AT49F002A-55PI
- Part No.:
- AT49F002A-55PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49F002A-55PI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
AT49F002A-55PI from Atmel is a 5V-only, 2 Mbit (256K × 8) parallel-interface Flash memory IC designed for embedded firmware storage and boot code retention in industrial systems. It delivers 55 ns read access time, supports byte-by-byte programming (20 µs/byte), features hardware data protection, and includes a programmable 16K-byte boot block with lockout capability - used in microcontroller-based boot loaders requiring secure, field-upgradable firmware.
For engineers reviewing the AT49F002A-55PI datasheet, AT49F002A-55PI pinout, AT49F002A-55PI application, or AT49F002A-55PI equivalent, key selection criteria include its 55 ns read timing, sector-erase architecture (1 boot + 2 parameter + 4 main blocks), CMOS standby current (100 µA), RESET-enabled boot override (12 V), and PLCC-32 packaging compatibility with legacy 8-bit bus interfaces.
Technical Context
This device implements a standard parallel NOR Flash architecture with CE/OE/WE control logic, internal program timer, and command-register-based operation. It uses Atmel's nonvolatile CMOS process to achieve 10,000 write/erase cycles and supports both chip-erase (4 s max) and sector-erase (parameter and main blocks) via six-cycle software command sequences.
The AT49F002A-55PI operates exclusively at 5 V ±10% across –40°C to +85°C, integrates DATA polling (I/O7 complement) and Toggle Bit (I/O6) for cycle completion detection, and enforces hardware safeguards including VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and multi-signal inhibit (OE low / CE high / WE high).
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 firmware plus parameter storage in 8-bit microcontroller systems. |
| Read Access Time | 55 ns - enables direct interface with 12–16 MHz 8051, Z80, or 68K-family processors without wait states. |
| Byte Programming Time | 20 µs typical - allows rapid field updates of small configuration or calibration data segments. |
| Erase Cycle Time | 4 seconds maximum for full chip erase - balances speed and reliability for infrequent firmware upgrades. |
| Standby Current | 100 µA CMOS - critical for low-power industrial controllers during sleep or idle modes. |
| Write End Detection | DATA polling (I/O7) and Toggle Bit (I/O6) - eliminates need for fixed delay timers in host firmware, improving system responsiveness. |
| Boot Block Protection | 16K-byte sector (00000H–03FFFH) with lockout enable/disable via command sequence - ensures bootloader integrity while permitting runtime update of application code. |
Pinout & Package
AT49F002A-55PI is packaged in a 32-pin Plastic Dual Inline Package (PDIP), 0.600" wide (JEDEC MS-001), with 0.100" lead pitch and through-hole mounting. Pin 1 is marked by a notch or dot; pin numbering follows standard DIP convention (counter-clockwise from top-left corner).
| 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 and WE high for read access - prevents bus contention in shared-memory systems. |
| OE | Output Enable | Active-low output control; used with CE to gate data onto bus - enables multiplexed bus sharing with other peripherals. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command cycle - central to all programming/erase operations. |
| RESET | Reset Input | Active-low reset; halts ongoing operations and forces high-Z outputs; 12 V applied here overrides boot block lockout - unique to AT49F002A (not available on AN/ANT variants). |
| VCC / GND | Power Supply | 5 V ±10% supply (VCC) and ground (GND); VCC sense circuitry disables programming if voltage drops below 3.8 V. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture | One 16K-byte boot block (lockable), two 8K-byte parameter blocks, and four main memory blocks (32K + 3×64K) - enables granular firmware partitioning and selective reprogramming without full chip erase. |
| Hardware Data Protection | VCC sense, multi-signal inhibit (OE/CE/WE), and 15 ns noise filtering - prevents accidental writes during power transients or EMI events in industrial environments. |
| Boot Block Lockout Override | 12 V applied to RESET pin unlocks protected boot sector for chip/sector erase or byte programming - provides recovery path when lockout is enabled but update required. |
| End-of-Operation Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - allows host processor to poll asynchronously instead of using fixed delays, reducing firmware complexity and latency. |
| Command-Driven Operation | Standardized 4–6 bus-cycle command sequences (e.g., 555H/AAH → AAH/55H → 80H → 555H/AAH → 55H → 40H for lockout) - eliminates need for external high-voltage generators or custom programming hardware. |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot Loader |
|---|---|
|
Use Scenario: Storing firmware and configuration data in programmable logic controllers operating in harsh factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile code storage with 55 ns read access enabling real-time instruction fetch for 8-bit MCUs; boot block lockout secures startup routines against corruption. Use Value: 10,000 write cycles and 100 µA standby current ensure long-term reliability and low energy consumption during idle periods between scan cycles. |
Use Scenario: Hosting boot code for Z80 or 8051-based embedded systems where firmware must survive power loss and support field updates via serial interface. IC Role / Device Role / Timing Role: Parallel NOR Flash providing direct CPU bus access; sector-erase capability allows updating application code while preserving immutable bootloader in protected 16K boot block. Use Value: RESET-pin 12 V override enables emergency bootloader reprogramming - critical for remote or inaccessible deployed units. |
| Medical Device Configuration Memory | Automotive Diagnostic Module Storage |
|
Use Scenario: Retaining calibrated sensor offsets, user preferences, and safety-critical operational parameters in portable diagnostic equipment certified for IEC 60601 compliance. IC Role / Device Role / Timing Role: Parameter block (2×8K) stores volatile configuration data; hardware write protection prevents unintended modification during runtime or brown-out conditions. Use Value: VCC sense and noise filtering ensure no spurious writes occur during battery switchover or ESD events - meeting medical-grade data integrity requirements. |
Use Scenario: Storing OBD-II protocol stacks and vehicle-specific calibration tables in aftermarket diagnostic tools operating across 12 V automotive electrical systems. IC Role / Device Role / Timing Role: Main memory blocks (32K + 3×64K) hold multiple vehicle profiles; fast 20 µs byte programming enables quick update of calibration data via CAN-connected host. Use Value: 4-second chip erase time allows complete firmware refresh within service bay time constraints without requiring specialized programmers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV002BT-55REI | 3 V core / 5 V I/O; 55 ns read; 12 V not required for boot override; lacks RESET-based lockout override. | Designed for mixed-voltage systems; no 12 V dependency simplifies power design but removes emergency unlock path. | Select when 3 V compatibility is needed and boot block updates are managed via software-controlled sector erase only. |
| SST39VF020-55-4C-NHE | 3.3 V only; 55 ns read; 100 µA standby; no RESET pin; boot block protection implemented via software commands only. | Lower power and smaller footprint (TSOP32); no hardware reset override - requires full chip erase to modify locked boot sector. | Select for space-constrained, low-power designs where boot code changes are rare and controlled via production programming. |
Compared with AM29LV002BT-55REI and SST39VF020-55-4C-NHE, the AT49F002A-55PI uniquely combines 5 V-only operation, hardware-enforced boot block lockout, and 12 V RESET override - making it optimal for legacy industrial systems requiring robust, field-serviceable firmware security without voltage translation.
Availability
AT49F002A-55PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot loader implementation, medical device configuration memory, and automotive diagnostic module storage requiring stable component supply over extended product lifecycles.
Supply support for AT49F002A-55PI 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, nonvolatile memory, and secure authentication ICs, with a legacy of robust industrial-grade Flash solutions.
The AT49F002A series belongs to Atmel's parallel NOR Flash product line, engineered for reliable firmware storage in resource-constrained 8-bit embedded systems where deterministic timing, sector-level erasability, and hardware write protection are essential.
FAQ
What is the operating temperature range for the AT49F002A-55PI?
The AT49F002A-55PI is rated for industrial operation from –40°C to +85°C. This range is validated across all DC and AC specifications including 55 ns read access time, 25 mA active current, and 100 µA CMOS standby current - ensuring reliable performance in factory automation, outdoor instrumentation, and transportation control systems.
Does the AT49F002A-55PI require high voltage for programming?
No, the AT49F002A-55PI performs all programming and erase operations at 5 V only - no external 12 V or higher programming voltage is needed for standard byte programming, sector erase, or chip erase. The 12 V applied to the RESET pin is solely for overriding boot block lockout and is not used during normal reprogramming cycles.
How is boot block protection enabled or disabled on the AT49F002A-55PI?
Boot block protection on the AT49F002A-55PI is enabled via a six-cycle command sequence (555H/AAH → AAH/55H → 80H → 555H/AAH → 55H → 40H). Once enabled, the 16K-byte boot block (00000H–03FFFH) becomes permanently write-protected at ≤5.5 V. Disabling requires 12 V applied to RESET - a feature exclusive to the AT49F002A variant, not present in AN or ANT versions.
What package type does the AT49F002A-55PI use?
The AT49F002A-55PI uses a 32-pin Plastic Dual Inline Package (PDIP), 0.600" wide (ordering code suffix "PI"), compliant with JEDEC MS-001. It features through-hole mounting, 0.100" lead pitch, and pin 1 identification via notch or dot - designed for compatibility with legacy PCB layouts and socket-based development systems.
Can the AT49F002A-55PI be used in place of the AT49F002AN-55PI?
No - the AT49F002A-55PI and AT49F002AN-55PI are not functionally interchangeable. The "N" suffix indicates absence of the RESET pin functionality: AT49F002AN-55PI has pin 1 as NC and lacks both RESET-driven reset behavior and 12 V boot override capability. Substituting them risks failure to recover locked boot sectors or improper system reset sequencing.
AT49F002A-55PI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-DIP (0.600", 15.24mm)
- 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:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT49F002A-55PI FAQ
1.How can I place an order for AT49F002A-55PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002A-55PI 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-55PI reliable?
The price and inventory of AT49F002A-55PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002A-55PI is usually 5 days.
3.What payment methods are accepted for AT49F002A-55PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002A-55PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002A-55PI?
AT49F002A-55PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002A-55PI 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-55PI?
For technical support, including AT49F002A-55PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002A-55PI requirements.
6.How does Aetrix verify that AT49F002A-55PI is sourced from the original manufacturer or authorized distributors?
All AT49F002A-55PI 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-55PI meets industry standards.
7.What is the process for return or replacement of AT49F002A-55PI?
All AT49F002A-55PI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002A-55PI, 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-55PI part is unused and in its original packaging.
Return procedure for AT49F002A-55PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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