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Microchip Technology AT49F002-70JC
- Part No.:
- AT49F002-70JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002-70JC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,648
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Product details
Overview
AT49F002-70JC from Atmel is a 2-Mbit (256K × 8) 5V-only in-system reprogrammable Flash memory IC with 70 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 0°C to 70°C and supports standard CE/OE/WE control for EPROM-like read and byte-wise reprogramming in embedded firmware storage applications.
For engineers reviewing the AT49F002-70JC datasheet, AT49F002-70JC pinout, AT49F002-70JC application, or AT49F002-70JC equivalent, this page delivers verified specifications, PLCC-32 package layout, boot-block protection behavior, sector erase timing, and real-world alternatives for firmware update subsystems requiring reliable nonvolatile code storage.
Technical Context
The AT49F002-70JC implements a command-register-based architecture with six-byte software command sequences for chip/sector erase and boot lockout enable. Its internal program control logic eliminates external high-voltage requirements, enabling 5V-only operation for both read and reprogramming cycles.
Memory organization includes one 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (96K + 128K bytes). Hardware data protection uses VCC sensing (<3.8V inhibit), noise filtering (<15 ns pulse rejection), and control-line gating (OE low/CE high/WE high disables programming).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - directly maps to 8-bit microcontroller data bus without address translation. |
| Read Access Time | 70 ns maximum - ensures compatibility with 14 MHz system clocks and meets timing margins for legacy 8051/68K-based controllers. |
| Byte Programming Time | 10 µs typical (50 µs max) - enables rapid field updates of small firmware patches without extended downtime. |
| Erase Cycle Time | 10 seconds typical for full chip or sector erase - supports deterministic firmware recovery workflows in industrial PLCs. |
| End-of-Program Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - allows host MCU to poll status without fixed delays or external timers. |
| Power Dissipation | 50 mA active current, 100 µA CMOS standby - suitable for battery-backed systems requiring low quiescent power during sleep modes. |
| Endurance | 10,000 write/erase cycles - validated for frequent firmware revision cycles in test equipment and medical device calibration storage. |
Pinout & Package
AT49F002-70JC is packaged in a 32-lead Plastic J-leaded Chip Carrier (PLCC), compliant with JEDEC MS-016 AE. Pin 1 is marked by corner notch; pin 17 is GND, pin 32 is VCC. Pin 1 (RESET) is functional and supports 12V override for boot block reprogramming.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A16 used for sector selection in command sequences. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; gates all internal operations. |
| OE | Output Enable | Active-low output control; places I/O pins in high-impedance state when high, preventing bus contention. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command cycle timing; inhibits programming if held high. |
| RESET | Reset Input | Active-low reset halts ongoing operations and forces high-Z outputs; 12V input overrides boot block lockout (not available on N/T variants). |
| I/O0–I/O7 | Data Inputs/Outputs | Bi-directional 8-bit data bus; I/O0 indicates boot lockout status in product ID mode; I/O6 = toggle bit, I/O7 = DATA polling indicator. |
| DC | Don't Connect | Pin 9 in PLCC package is NC - must remain unconnected to avoid undefined behavior or latch-up. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture | Independent erasability of 16K boot block, two 8K parameter blocks, and two main memory blocks enables modular firmware updates without full chip erase. |
| Boot Block Lockout | Software-enabled permanent write protection for secure boot code (00000H–03FFFH); prevents accidental corruption during field upgrades. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line gating eliminate need for external voltage supervisors or debounce circuits in noisy industrial environments. |
| 5V-Only Reprogramming | No external 12V programming supply required - simplifies PCB design and reduces BOM count for embedded systems with single-rail power. |
| DATA Polling & Toggle Bit | Dual asynchronous end-of-program detection methods allow flexible host-side timing management without fixed delay loops or external clocks. |
Applications
| Industrial PLC Firmware Storage | Medical Device Calibration Data |
|---|---|
Use Scenario: Storing and updating ladder logic firmware in programmable logic controllers deployed in factory automation lines. IC Role / Device Role / Timing Role: Nonvolatile code storage with in-system reprogrammability; 70 ns read access supports real-time scan cycle execution. Use Value: Sector erase capability allows patching only modified function blocks, reducing update time from minutes to seconds and minimizing machine downtime. |
Use Scenario: Retaining calibrated sensor coefficients and safety-critical configuration parameters in portable diagnostic equipment. IC Role / Device Role / Timing Role: Secure, tamper-resistant parameter memory; boot block lockout protects FDA-mandated startup routines. Use Value: 10,000-cycle endurance ensures >10 years of recalibration cycles under daily clinical use without memory wear-out failure. |
| Test Equipment Bootloader | Legacy Embedded System Upgrade Path |
Use Scenario: Hosting bootloader code that validates and loads application firmware images from external media in automated test systems. IC Role / Device Role / Timing Role: Read-only boot execution region with hardware-enforced write protection; 5V-only interface matches legacy 5V controller buses. Use Value: RESET pin 12V override enables emergency bootloader recovery even after accidental lockout - critical for unattended production test stations. |
Use Scenario: Replacing obsolete EPROMs (e.g., 27C256) in aging industrial control boards where PCB layout cannot accommodate new packages. IC Role / Device Role / Timing Role: Pin-compatible Flash replacement with identical DIP/PLCC footprints and EPROM-style CE/OE/WE timing. Use Value: Eliminates UV erasers and socket programming; enables field firmware updates via existing JTAG or serial interfaces without board redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV002BT-70EC | 3V core with 5V I/O tolerance; 70 ns read; 12V RESET not supported; boot block at top address (3C000H–3FFFFH) | Requires dual-supply design; no 12V override for boot block recovery | Select when migrating to lower-power 3V systems and boot block location alignment with AT49F002T variant is acceptable. |
| SST39VF020-70-4C-NHE | 3.3V operation only; 70 ns read; 10 µs byte program; no RESET pin; top-boot architecture | Not 5V-compatible; lacks hardware reset abort and 12V override capability | Choose for cost-sensitive 3.3V designs where boot block protection is managed entirely in software and field recovery via RESET is unnecessary. |
Compared with AM29LV002BT-70EC and SST39VF020-70-4C-NHE, the AT49F002-70JC uniquely provides 5V-only operation with functional RESET pin and 12V override - making it the only option among the three that guarantees recoverable boot block reprogramming in legacy 5V systems after lockout activation.
Availability
AT49F002-70JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device calibration data retention, and legacy embedded system upgrade paths requiring stable component supply and long-term obsolescence mitigation.
Supply support for AT49F002-70JC 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, Flash memory, and secure authentication devices for industrial and automotive markets.
The AT49F002-70JC belongs to Atmel's early-generation 5V Flash memory product line, designed specifically for drop-in EPROM replacement and in-system firmware upgradability in cost-sensitive, reliability-critical embedded systems.
FAQ
What is the boot block address range for AT49F002-70JC?
The AT49F002-70JC uses the AT49F002(N) memory map: its 16K-byte boot block occupies addresses 00000H to 03FFFH. This is distinct from the AT49F002T variant, which locates the boot block at 3C000H–3FFFFH. The AT49F002-70JC datasheet confirms this mapping in the Block Diagram and Command Definitions sections.
Does AT49F002-70JC support 12V RESET override for boot block reprogramming?
Yes, AT49F002-70JC supports 12V ± 0.5V applied to the RESET pin to override enabled boot block lockout - allowing chip erase, sector erase, or byte programming of the protected region. This feature is explicitly documented in the RESET section and is unavailable on AT49F002N(T) variants.
What package type does AT49F002-70JC use?
AT49F002-70JC uses a 32-lead Plastic J-leaded Chip Carrier (PLCC) package, designated as 32J per Atmel's Ordering Information table. Pin 1 is identified by a corner notch; pin 17 is GND and pin 32 is VCC. The package complies with JEDEC MS-016 AE standard.
How is end-of-program detected on AT49F002-70JC?
AT49F002-70JC provides two hardware-supported methods: DATA polling (I/O7 returns complement of loaded data until completion, then true data) and Toggle Bit (I/O6 toggles between 0/1 during programming and stabilizes upon completion). Both are usable at any point during the cycle and require no external timing components.
Is AT49F002-70JC compatible with standard EPROM read timing?
Yes, AT49F002-70JC operates identically to EPROMs during read: CE and OE low with WE high asserts data on I/O0–I/O7. Its tCE and tOE values (70 ns max) match common EPROM timing, enabling direct replacement of 27C256 or 27C020 in existing 5V systems without timing adjustments.
AT49F002-70JC 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)
AT49F002-70JC FAQ
1.How can I place an order for AT49F002-70JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002-70JC 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 AT49F002-70JC reliable?
The price and inventory of AT49F002-70JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002-70JC is usually 5 days.
3.What payment methods are accepted for AT49F002-70JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002-70JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002-70JC?
AT49F002-70JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002-70JC 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 AT49F002-70JC?
For technical support, including AT49F002-70JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002-70JC requirements.
6.How does Aetrix verify that AT49F002-70JC is sourced from the original manufacturer or authorized distributors?
All AT49F002-70JC 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 AT49F002-70JC meets industry standards.
7.What is the process for return or replacement of AT49F002-70JC?
All AT49F002-70JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002-70JC, 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 AT49F002-70JC part is unused and in its original packaging.
Return procedure for AT49F002-70JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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