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Microchip Technology AT49F002N-70PC
- Part No.:
- AT49F002N-70PC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-DIP (0.600", 15.24mm)
- Datasheet:
-
AT49F002N-70PC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,955
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Product details
Overview
AT49F002N-70PC 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-70PC datasheet, AT49F002N-70PC pinout, AT49F002N-70PC application, or AT49F002N-70PC equivalent, key selection criteria include its 5V-only operation, boot block lockout capability, DATA polling/Toggle Bit erase-program status detection, and compatibility with standard EPROM read timing interfaces in legacy and industrial control designs.
Technical Context
The AT49F002N-70PC implements a command-register-based Flash architecture requiring six-byte software sequences for chip/sector erase and boot block lockout enable. Its internal program control logic eliminates external high-voltage programming circuitry, enabling direct 5V-only system-level reprogramming.
It features dual-line bus control (CE/OE) for contention-free read access, hardware VCC sense (<3.8V inhibit), noise filtering on WE/CE inputs, and RESET-driven boot block override (12V on RESET pin). The boot block (00000H–03FFFH) is permanently protected once lockout is enabled, while parameter and main memory blocks support independent sector erase.
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 - meets timing requirements for 14 MHz Z80 or 8051-based systems without wait states. |
| Byte Programming Time | 10 µs typical - enables rapid field updates of configuration or calibration data without system downtime. |
| Erase Cycle Time | 10 seconds max - allows full-chip or sector erase within interactive diagnostic or maintenance windows. |
| End-of-Operation Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delay timers in host firmware. |
| Power Dissipation | 50 mA active / 100 µA CMOS standby - suitable for low-power industrial controllers with battery backup. |
| Endurance | 10,000 write/erase cycles - sufficient for firmware revision management over 10+ year product lifecycles. |
Pinout & Package
AT49F002N-70PC is supplied in a 32-pin, 0.600" wide plastic DIP (PDIP) package (package code 32P6), with pin 1 designated as A16 per DIP top-view diagram. Pin 1 is a don't-connect (DC) pin for this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A16 used for memory location, A17 unused in 256K×8 config. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access - enables multi-device memory decoding. |
| OE | Output Enable | Active-low output gate; controls data bus drivers independently of CE - prevents bus contention during shared-memory arbitration. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence - critical for reliable software-controlled erase/program execution. |
| I/O0–I/O7 | Data Bus | Bidirectional 8-bit data interface; carries command codes, program data, and status bits (I/O6 toggle, I/O7 polling) - no separate address/data multiplexing required. |
| RESET | Reset Control | Active-low reset input; halts ongoing operations and forces high-Z outputs - also accepts 12V for boot block override (not available on AT49F002N(T) variants). |
| VCC / GND | Power Supply | 5V ±10% supply with 100 µA CMOS standby current - compatible with standard TTL/CMOS logic rails and low-quiescent LDOs. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Lockout | 16K-byte boot block (00000H–03FFFH) can be permanently write-protected via command sequence - ensures bootloader integrity in unattended field deployments. |
| 5V-Only Reprogrammability | No external 12V programming voltage required; all commands executed using standard 5V logic levels - simplifies PCB design and eliminates HV charge pumps. |
| Hardware Data Protection | VCC sense (<3.8V inhibit), WE/CE noise filtering (<15 ns pulses ignored), and triple-control (OE high / CE high / WE high) program inhibit - prevents accidental writes during power transients or noise events. |
| Two Status Monitoring Methods | Simultaneous DATA polling (I/O7) and Toggle Bit (I/O6) allow flexible host firmware polling strategies without external timing components. |
| Standard EPROM-Compatible Read Interface | CE/OE/WE timing matches industry-standard EPROMs - enables drop-in replacement in existing 27C256/27C512-based designs with no timing redesign. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot Memory |
|---|---|
Use Scenario: Storing firmware and configuration data for programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding initialization code and runtime parameters; accessed via 8051-compatible bus with 70 ns read timing. Use Value: Sector erase enables field-upgradable ladder logic without replacing hardware; boot block lockout prevents corruption of safety-critical startup routines. | Use Scenario: Replacing obsolete EPROMs (e.g., 27C256) in medical device controllers where firmware updates are infrequent but require guaranteed integrity. IC Role / Device Role / Timing Role: Direct-read Flash memory emulating EPROM behavior; uses identical CE/OE/WE handshake and address/data bus layout. Use Value: Eliminates UV-erasure and socket programming; 10,000-cycle endurance supports long-term service life without hardware refresh. |
| Automotive Diagnostic Module Code Storage | Point-of-Sale Terminal Configuration Memory |
Use Scenario: Holding diagnostic application code and vehicle-specific calibration tables in OBD-II scan tools subjected to automotive-grade thermal cycling (-40°C to +85°C). IC Role / Device Role / Timing Role: In-system reprogrammable Flash storing executable code and lookup tables; accessed during power-on self-test and runtime diagnostics. Use Value: Parameter block sectors allow safe update of calibration data without risking boot code; 5V-only operation avoids dedicated programming voltage rails. | Use Scenario: Storing localized language packs, tax rate tables, and peripheral driver configurations in retail terminals deployed globally. IC Role / Device Role / Timing Role: Field-updatable nonvolatile memory mapped into microcontroller address space; programmed via serial host interface using software command sequences. Use Value: Sector architecture enables regional updates without full firmware reload; DATA polling simplifies host-side programming state machine implementation. |
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/5V dual-voltage operation; 70 ns access; 2 Mbit; boot block at top (3C000H–3FFFFH); no 12V RESET override. | Requires voltage translation in pure 5V systems; boot block location differs - may require address map changes in legacy designs. | Select when migrating to lower-voltage systems or needing extended temperature range (-40°C to +105°C). |
| MX29LV002CTTI-70G | 5V-only; 70 ns access; 2 Mbit; top-boot architecture; Toggle Bit only (no DATA polling); no RESET-based boot override. | Lacks DATA polling feedback - requires fixed-timing or status register polling; boot block not reprogrammable even with 12V. | Select when cost sensitivity outweighs debug flexibility, and host firmware can accommodate single-status-bit monitoring. |
Compared with AM29LV002BT-70EC and MX29LV002CTTI-70G, the AT49F002N-70PC provides unique 12V RESET-driven boot block override and dual-status signaling (DATA polling + Toggle Bit), making it preferable for field-serviceable industrial equipment where recovery from corrupted boot code is mission-critical.
Availability
AT49F002N-70PC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot memory, and automotive diagnostic module code storage requiring stable component supply and long-term obsolescence management.
Supply support for AT49F002N-70PC 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, automotive, and consumer applications.
The AT49F002N series belongs to Atmel's 5V-only Flash memory product line, designed specifically for seamless EPROM replacement and in-system firmware updates in resource-constrained 8-bit embedded systems.
FAQ
What is the memory organization and total capacity of the AT49F002N-70PC?
The AT49F002N-70PC contains 2 Mbit (262,144 × 8) of Flash memory, organized as 256K words × 8 bits. Its physical address space spans 00000H to 3FFFFH, partitioned into a 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (96K and 128K bytes). This structure supports modular firmware updates without affecting core boot code.
Does the AT49F002N-70PC support in-system programming with standard 5V logic levels?
Yes, the AT49F002N-70PC supports full in-system reprogramming using only 5V logic levels - no external high-voltage programming supply is needed. All command sequences (chip erase, sector erase, byte program, boot lockout) are executed via standard WE/CE/OE strobes and address/data bus transactions, making it compatible with conventional microcontroller GPIO or bus-interface logic.
How does the boot block programming lockout feature work on the AT49F002N-70PC?
The AT49F002N-70PC's boot block lockout is enabled by a six-byte command sequence written to specific addresses (5555H/2AAAH). Once activated, the 16K-byte boot block (00000H–03FFFH) becomes permanently write-protected at ≤5.5V. Protection can be overridden only by applying 12V ±0.5V to the RESET pin - a feature absent in AT49F002N(T) variants - allowing emergency recovery in the field.
What methods are available to detect completion of program or erase operations on the AT49F002N-70PC?
The AT49F002N-70PC provides two hardware-supported status detection methods: DATA polling (reading the last programmed byte returns its complement on I/O7 until completion) and Toggle Bit (I/O6 toggles between 0 and 1 during operation and stabilizes upon completion). Both methods eliminate reliance on fixed timing delays and improve host firmware robustness across voltage/temperature variations.
Is the AT49F002N-70PC pin-compatible with standard EPROMs like the 27C256?
Yes, the AT49F002N-70PC uses identical pinout, signal definitions (CE/OE/WE/A0–A15/I/O0–I/O7), and read timing (70 ns access, tCE/tOE compatibility) as the 27C256 EPROM. It requires no PCB changes for drop-in replacement, though designers must implement software command sequences for programming - unlike UV-erasable EPROMs which rely on external programmers.
AT49F002N-70PC 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:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-PDIP
AT49F002N-70PC FAQ
1.How can I place an order for AT49F002N-70PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002N-70PC 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-70PC reliable?
The price and inventory of AT49F002N-70PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002N-70PC is usually 5 days.
3.What payment methods are accepted for AT49F002N-70PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002N-70PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002N-70PC?
AT49F002N-70PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002N-70PC 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-70PC?
For technical support, including AT49F002N-70PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002N-70PC requirements.
6.How does Aetrix verify that AT49F002N-70PC is sourced from the original manufacturer or authorized distributors?
All AT49F002N-70PC 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-70PC meets industry standards.
7.What is the process for return or replacement of AT49F002N-70PC?
All AT49F002N-70PC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002N-70PC, 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-70PC part is unused and in its original packaging.
Return procedure for AT49F002N-70PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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