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Microchip Technology AT49F002N-70JC
- Part No.:
- AT49F002N-70JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002N-70JC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,156
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Product details
Overview
AT49F002N-70JC from Atmel is a 5V-only, 2 Mbit (256K × 8) in-system reprogrammable Flash memory IC with 70 ns read access time, sector-based architecture (16K-byte boot block + two 8K-byte parameter blocks + two main memory blocks), and hardware data protection. It operates across 0°C to 70°C and supports byte-by-byte programming at 10 µs/byte typical for embedded firmware storage in microcontroller-based systems.
For engineers reviewing the AT49F002N-70JC datasheet, AT49F002N-70JC pinout, AT49F002N-70JC application, or AT49F002N-70JC equivalent, key selection criteria include its 5V-only operation, boot block lockout capability, 10,000 write cycles endurance, CMOS standby current of 100 µA, and PLCC-32 package compatibility with legacy board layouts.
Technical Context
The AT49F002N-70JC implements a command-driven architecture using standard CE/OE/WE control lines-identical to EPROM interface timing-enabling drop-in replacement in existing 5V systems. Its internal program control logic handles erase and programming without external high-voltage generators.
Sector erase functionality targets specific memory regions: boot block (00000H–03FFFH), two parameter blocks (04000H–05FFFH and 06000H–07FFFH), and two main memory blocks (08000H–1FFFFH and 20000H–3FFFFH). Boot block lockout is software-enabled and permanent once activated under 5.5V.
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 | 70 ns max - ensures compatibility with 14 MHz Z80 or 8051 bus timing without wait states. |
| Operating Voltage | 5 V ±10% - eliminates need for charge pumps or dual-supply rails in 5V system designs. |
| Write Endurance | 10,000 program/erase cycles - sufficient for field firmware updates over product lifetime. |
| Standby Current | 100 µA CMOS - enables low-power modes in battery-backed or portable applications. |
| Erase Time | 10 seconds max chip erase - enables rapid reprogramming during manufacturing or service. |
| Byte Programming | 10 µs typical per byte - allows fine-grained patching without full-sector erasure overhead. |
Pinout & Package
AT49F002N-70JC is housed in a 32-lead Plastic J-leaded Chip Carrier (PLCC) package, pin-compatible with industry-standard 32J footprint. Pin 1 is marked by index notch; pin 9 is NC (no connect) per datasheet.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing space (00000H–3FFFFH). |
| I/O0–I/O7 | Data Bus | Bi-directional 8-bit data path; latched on rising edge of WE/CE during programming. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read output. |
| OE | Output Enable | Active-low output gate; controls tri-state buffer to prevent bus contention during shared-memory access. |
| WE | Write Enable | Active-low write strobe; initiates command sequences and latches data on rising edge. |
| RESET | Reset Input | Active-low reset; forces outputs to high-Z and halts ongoing operations; not used for boot lock override (unavailable on N variant). |
| GND / VCC | Power Rails | Ground reference and 5V supply; decoupling required within 1 cm of pins per JEDEC PLCC layout guidelines. |
| DC (Pin 9) | No Connect | Internally unconnected; must remain floating - no external tie required. |
Key Features
| Feature | Design Value |
|---|---|
| Boot Block Lockout | 16K-byte region (00000H–03FFFH) permanently protected after software enable - secures bootloader code against accidental overwrite. |
| Data Polling | I/O7 complements last programmed byte until completion - enables real-time polling without timer dependencies or status register reads. |
| Hardware Data Protection | VCC sense (<3.8V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line interlock (OE low/CE high/WE high blocks writes) - prevents spurious writes in noisy environments. |
| Sector Erase Flexibility | Independent erase of boot block, parameter blocks, or main memory blocks - allows selective firmware updates without disturbing critical boot code. |
| Standard EPROM Interface | CE/OE/WE timing matches industry-standard EPROMs - simplifies migration from UV-erasable devices without logic redesign. |
Applications
| Industrial PLC Firmware Storage | Medical Device Bootloader Memory |
|---|---|
Use Scenario: Storing firmware images and configuration parameters in programmable logic controllers deployed in factory automation environments with ambient temperatures up to 70°C. IC Role / Device Role / Timing Role: Nonvolatile program memory providing fast 70 ns read access to support deterministic scan-cycle execution in real-time control loops. Use Value: Sector architecture enables field-upgradable application logic while preserving immutable bootloader in protected 16K boot block - ensuring safe recovery after failed update. | Use Scenario: Holding certified bootloader and calibration data in Class II medical instruments requiring traceable, tamper-resistant firmware storage. IC Role / Device Role / Timing Role: Secure, reprogrammable flash memory with hardware write protection and 10,000-cycle endurance - meets IEC 62304 software lifecycle requirements. Use Value: Boot block lockout prevents unauthorized modification of safety-critical startup routines; DATA polling confirms write completion without CPU intervention. |
| Legacy Embedded System Upgrade | Point-of-Sale Terminal Code Storage |
Use Scenario: Replacing obsolete 27C020 EPROMs in aging industrial controllers where PCB layout prohibits package change. IC Role / Device Role / Timing Role: Pin-compatible 5V Flash memory with identical PLCC-32 footprint and EPROM-style CE/OE/WE interface - zero hardware modification required. Use Value: Eliminates UV eraser dependency and enables in-system firmware updates via existing JTAG or serial interfaces - reducing maintenance downtime. | Use Scenario: Storing payment application firmware and localization strings in retail terminals operating in commercial temperature range with frequent software patches. IC Role / Device Role / Timing Role: High-reliability Flash memory supporting daily field updates via secure download protocols with verified write integrity. Use Value: Byte-programming (10 µs/byte) and sector erase minimize update window; 100 µA standby current extends battery backup runtime during power loss events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002N-70PC | DIP-32 package instead of PLCC-32; same electrical specs and timing; pin 1 location differs. | Requires through-hole PCB layout; unsuitable for surface-mount assembly or high-density boards. | Select only when legacy DIP socket infrastructure exists and rework to PLCC is impractical. |
| AT49F002N-70TC | TSOP-32 (8×20 mm) package; identical AC/DC characteristics but different thermal profile and solder-reflow requirements. | Better suited for compact, high-volume consumer electronics; requires reflow-compatible PCB design. | Choose for new designs prioritizing board area savings and automated assembly - verify thermal derating at 70°C case temperature. |
Compared with AT49F002N-70PC and AT49F002N-70TC, the AT49F002N-70JC offers optimal mechanical robustness and thermal performance in PLCC form factor, making it preferred for industrial control modules where vibration resistance and long-term socket retention matter.
Availability
AT49F002N-70JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device bootloader memory, and legacy embedded system upgrades requiring stable component supply and long-lifecycle support.
Supply support for AT49F002N-70JC 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 security ICs for industrial, automotive, and consumer applications.
The AT49F002 series was designed as a 5V-only Flash memory solution for seamless EPROM replacement in legacy 8-bit systems, emphasizing in-system reprogrammability, sector-level protection, and industrial-grade reliability.
FAQ
What is the maximum operating temperature range for the AT49F002N-70JC?
The AT49F002N-70JC is rated for commercial temperature operation from 0°C to +70°C. This range is defined by its -70 suffix and confirmed in the Ordering Information table on page 12 of the datasheet. The device's 70 ns access time is guaranteed across this full range, and its 100 µA standby current specification applies at +70°C ambient. It is not qualified for industrial (-40°C to +85°C) use - for that, the AT49F002N-70JI variant must be selected.
Does the AT49F002N-70JC support boot block lockout, and how is it enabled?
Yes, the AT49F002N-70JC supports boot block lockout for its 16K-byte region (00000H–03FFFH). It is enabled via a six-cycle command sequence: load AAH to 5555H, 55H to 2AAAH, then 80H to 5555H, followed by AAH/55H/40H to 5555H/2AAAH/5555H. Once activated, the boot block becomes permanently write-protected under 5.5V - no hardware override is available on the N variant, unlike the T version which supports 12V RESET override.
What package type does the AT49F002N-70JC use, and is pin 9 connected?
The AT49F002N-70JC uses a 32-lead Plastic J-leaded Chip Carrier (PLCC) package, designated as 32J in Atmel's ordering nomenclature. Pin 9 is explicitly marked as "Don't Connect" (DC) in the datasheet - it is internally unconnected and must remain floating. This is consistent across all AT49F002N variants in PLCC packaging and differs from TSOP/VSOP versions where pin 9 serves as RESET.
How does the AT49F002N-70JC indicate completion of a byte programming cycle?
The AT49F002N-70JC provides two hardware methods: DATA polling and Toggle Bit. In DATA polling mode, reading the last programmed address returns the complement of the written data on I/O7 until programming completes, then true data appears. In Toggle Bit mode, I/O6 toggles between 0 and 1 during programming and stops toggling upon completion. Both methods allow the host system to detect write readiness without fixed delays or status registers.
Can the AT49F002N-70JC be used as a direct replacement for standard EPROMs like the 27C020?
Yes, the AT49F002N-70JC is designed as a functional and pin-compatible replacement for 27C020 EPROMs in 5V systems. It shares identical PLCC-32 pinout, CE/OE/WE control interface, and read timing behavior. Unlike EPROMs, it requires no UV erasure and supports in-system reprogramming via standard microprocessor bus cycles - eliminating the need for external programmers or UV chambers while maintaining full backward compatibility.
AT49F002N-70JC 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:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49F002N-70JC FAQ
1.How can I place an order for AT49F002N-70JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002N-70JC 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 AT49F002N-70JC reliable?
The price and inventory of AT49F002N-70JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002N-70JC is usually 5 days.
3.What payment methods are accepted for AT49F002N-70JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002N-70JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002N-70JC?
AT49F002N-70JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002N-70JC 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 AT49F002N-70JC?
For technical support, including AT49F002N-70JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002N-70JC requirements.
6.How does Aetrix verify that AT49F002N-70JC is sourced from the original manufacturer or authorized distributors?
All AT49F002N-70JC 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 AT49F002N-70JC meets industry standards.
7.What is the process for return or replacement of AT49F002N-70JC?
All AT49F002N-70JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002N-70JC, 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 AT49F002N-70JC part is unused and in its original packaging.
Return procedure for AT49F002N-70JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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