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Microchip Technology AT49F002-55PI
- Part No.:
- AT49F002-55PI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49F002-55PI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,618
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Product details
Overview
AT49F002-55PI from Atmel is a 5V-only, 2 Mbit (256K × 8) in-system reprogrammable Flash memory IC with 55 ns read access time, 10 µs/byte typical programming time, and sector-based architecture including a 16K-byte boot block with programmable lockout. It operates across -40°C to +85°C industrial temperature range and supports standard CE/OE/WE control for EPROM-compatible read and byte-level write operations in embedded firmware storage applications.
For engineers reviewing the AT49F002-55PI datasheet, AT49F002-55PI pinout, AT49F002-55PI application, or AT49F002-55PI equivalent, key selection considerations include its 55 ns read timing, boot block hardware lockout capability, 10,000 program/erase cycle endurance, sector erase flexibility, and industrial-grade reliability for firmware update systems requiring field-reprogrammable nonvolatile storage.
Technical Context
The AT49F002-55PI implements a command-register-based architecture where all programming and erase functions are initiated via six-cycle software command sequences written to specific address/data combinations (e.g., 5555H/AAH, 2AAAH/55H). Its internal logic handles timing, voltage regulation, and state transitions without external clocks or high-voltage generators.
Memory organization comprises one 16K-byte boot block (address 00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (96K and 128K bytes), each independently erasable. Hardware data protection includes VCC sense (<3.8V inhibits programming), noise filtering on WE/CE inputs, and dual-line control (CE+OE) to prevent bus contention during read.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), enabling full firmware image storage for 8-bit microcontrollers |
| Read Access Time | 55 ns max - meets real-time boot code fetch requirements in 20 MHz+ bus systems |
| Byte Programming Time | 10 µs typical - supports rapid field updates of configuration parameters or patch data |
| Erase Cycle Time | 10 seconds max for full chip - enables predictable maintenance windows in embedded OTA workflows |
| Endurance | 10,000 write/erase cycles - validated for long-term use in industrial logging or calibration storage |
| Standby Current | 100 µA CMOS - ensures ultra-low power retention in battery-backed systems |
| Operating Voltage | 5.0 V ±10% - eliminates need for auxiliary voltage rails in legacy 5V designs |
Pinout & Package
AT49F002-55PI is packaged in a 32-pin, 0.600" wide plastic dual inline package (PDIP), pin-compatible with industry-standard 32-pin Flash memory footprints and suitable for through-hole prototyping and industrial PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A16 used for byte selection within 8-bit data width |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface compatible with 8051, Z80, and 68K family microcontrollers |
| CE | Chip Enable | Active-low chip select enabling multi-device memory mapping; must be low for valid read/write cycles |
| OE | Output Enable | Active-low output gate controlling data bus drive; used with CE to avoid bus contention during read |
| WE | Write Enable | Active-low signal initiating command latching or byte programming; falling edge latches address, rising edge latches data |
| RESET | Hardware Reset | Active-low reset input that forces high-impedance outputs; 12V override enables boot block reprogramming when lockout is active |
| GND / VCC | Power Supply | Single 5V supply with dedicated ground; no separate VPP required for programming |
| DC | No Connect | Pin 1 in DIP package is unconnected - must remain floating per datasheet specification |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Programming Lockout | 16K-byte region (00000H–03FFFH) can be permanently write-protected via command sequence, securing bootloader code against accidental overwrite |
| Data Polling & Toggle Bit | I/O7 complement and I/O6 toggle provide real-time, bus-compatible status feedback for program/erase completion without polling timers or external controllers |
| Sector Erase Flexibility | Independent erase of parameter blocks (8K each) and main memory blocks (96K/128K) enables selective firmware updates without full chip erase |
| Hardware Data Protection | VCC sense, noise filtering (<15 ns pulses rejected), and CE/OE/WE interlock prevent spurious writes during power transients or EMI events |
| 5V-Only Reprogrammability | Eliminates need for 12V programming supplies or external charge pumps - simplifies system power design and reduces BOM cost |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile program memory providing fast 55 ns read access for deterministic boot and instruction fetch, with field-upgradable firmware via RS-485 or Ethernet interfaces. Use Value: Sector erase allows incremental firmware patches without disrupting operational runtime code; boot block lockout prevents corruption of safety-critical startup routines. | Use Scenario: Holding certified bootloader and diagnostic firmware in Class II medical instruments requiring regulatory-compliant firmware integrity. IC Role / Device Role / Timing Role: Secure, tamper-resistant firmware storage with hardware-enforced boot block protection and 10,000-cycle endurance for lifetime device recalibration. Use Value: RESET pin 12V override enables authorized service personnel to reflash protected bootloader during certified maintenance - meeting IEC 62304 traceability requirements. |
| Automotive Diagnostic Module Code | Legacy Industrial HMI Configuration Storage |
Use Scenario: Storing OBD-II protocol stack and vehicle-specific calibration tables in aftermarket automotive scan tools operating across -40°C to +85°C. IC Role / Device Role / Timing Role: Industrial-temperature Flash memory serving as primary firmware repository with robust ESD immunity and noise-filtered WE/CE inputs. Use Value: 100 µA standby current extends battery life in portable diagnostic units; 55 ns access ensures responsive UI response during live data streaming. | Use Scenario: Retaining display configuration, language packs, and user preferences in panel-mounted HMIs used in manufacturing SCADA systems. IC Role / Device Role / Timing Role: Parameter block storage (two 8K sections) for modular, versioned configuration data updated independently of main application firmware. Use Value: Byte-programming (10 µs/byte) enables rapid GUI customization in production line setup; sector erase isolates config changes from core application updates. |
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 | 48-pin TSOP, 5V-only, 55 ns access, but uses different command set and lacks RESET-based boot block override | Requires PCB redesign due to 48-pin footprint; no 12V RESET override for locked boot sectors | Select if migrating to surface-mount layout and accepting software-only boot protection management |
| SST39VF020-55-4C-NHE | 32-pin PDIP, 5V-only, 55 ns, 10,000 cycles, but boot block is fixed at top 8K (not 16K) and lacks hardware RESET override | Compatible pinout and voltage, but smaller protected region limits bootloader size; no 12V recovery path | Choose for cost-sensitive replacements where boot code fits in 8K and field recovery is not required |
Compared with AM29LV002BT-55EI and SST39VF020-55-4C-NHE, the AT49F002-55PI uniquely combines 32-pin PDIP compatibility, 16K boot block size, and hardware-enabled 12V RESET override - making it the only option supporting secure, serviceable bootloader updates in legacy through-hole industrial designs.
Availability
AT49F002-55PI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader memory, automotive diagnostic module code, and legacy HMI configuration storage requiring stable component supply and long-term obsolescence support.
Supply support for AT49F002-55PI 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 fabless semiconductor company 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 offering in-system reprogrammability for 8-bit embedded systems needing reliable, 5V-only firmware storage with hardware-secured boot code integrity.
FAQ
What is the maximum operating temperature range for the AT49F002-55PI?
The AT49F002-55PI is rated for industrial temperature operation from -40°C to +85°C, verified per AC and DC specifications in the official Atmel datasheet Rev. 1017D. This range supports deployment in harsh environments such as factory floors, outdoor telemetry units, and under-hood automotive modules where thermal stability is critical for firmware integrity.
Does the AT49F002-55PI require a high-voltage programming supply?
No, the AT49F002-55PI operates with single 5V ±10% supply for both read and reprogramming functions. It does not require VPP or external charge pumps. All programming and erase commands are executed using standard 5V logic levels and internally generated voltages, simplifying power design and eliminating high-voltage circuitry.
How is boot block protection enabled and overridden on the AT49F002-55PI?
Boot block protection is enabled by issuing a six-cycle command sequence (5555H/AAH → 2AAAH/55H → 5555H/80H → 5555H/AAH → 2AAAH/55H → 5555H/40H). Once activated, the 16K boot block (00000H–03FFFH) becomes permanently write-protected at ≤5.5V. Override is achieved by applying 12.0V ±0.5V to the RESET pin during chip/sector erase or byte programming.
What packaging format is used for the AT49F002-55PI?
The AT49F002-55PI uses a 32-pin, 0.600" wide plastic dual inline package (PDIP), designated as package code 32P6 in Atmel's ordering information. This through-hole package supports manual soldering, socket-based development, and legacy board layouts requiring 32-pin Flash memory footprints.
Can the AT49F002-55PI be used as a direct replacement for standard EPROMs like the 27C256?
Yes, the AT49F002-55PI is pin-compatible and functionally compatible with 27C256 EPROMs in read mode (CE/OE/WE control, same address/data bus), but adds in-system reprogrammability without UV erasure. Unlike EPROMs, it requires no windowed package or UV programmer - enabling field firmware updates via standard microcontroller GPIO or UART-to-parallel adapters.
AT49F002-55PI 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
AT49F002-55PI FAQ
1.How can I place an order for AT49F002-55PI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002-55PI 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 AT49F002-55PI reliable?
The price and inventory of AT49F002-55PI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002-55PI is usually 5 days.
3.What payment methods are accepted for AT49F002-55PI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002-55PI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002-55PI?
AT49F002-55PI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002-55PI 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 AT49F002-55PI?
For technical support, including AT49F002-55PI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002-55PI requirements.
6.How does Aetrix verify that AT49F002-55PI is sourced from the original manufacturer or authorized distributors?
All AT49F002-55PI 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 AT49F002-55PI meets industry standards.
7.What is the process for return or replacement of AT49F002-55PI?
All AT49F002-55PI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002-55PI, 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 AT49F002-55PI part is unused and in its original packaging.
Return procedure for AT49F002-55PI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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