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Microchip Technology AT49F002-70JI
- Part No.:
- AT49F002-70JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002-70JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,309
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Product details
Overview
AT49F002-70JI from Atmel is a 5V-only, 2 Mbit (256K × 8) 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 hardware lockout. It operates across industrial temperature range (−40°C to +85°C) and supports standard parallel interface for embedded firmware storage in microcontroller-based systems.
For engineers reviewing the AT49F002-70JI datasheet, AT49F002-70JI pinout, AT49F002-70JI application, or AT49F002-70JI equivalent, key selection considerations include its 32-pin PLCC package, boot-block protection capability, software-controlled sector erase, DATA polling for program completion detection, and compatibility with 5V-only system buses requiring nonvolatile code storage.
Technical Context
The AT49F002-70JI implements a command-register-based architecture where all operations-including read, byte programming, sector erase, chip erase, and boot-block lockout-are initiated via six-cycle address/data sequences written to specific latched addresses (e.g., 5555H/2AAAH). Its internal control logic manages timing without external clocks, enabling autonomous erase cycles (10 s max) and byte programming (10–50 µs).
Memory organization is physically partitioned into five sectors: one 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (96K and 128K bytes). Sector erase commands target specific address ranges, while hardware data protection enforces VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line interlock (OE low / CE high / WE high disables writes).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), directly maps to 256KB firmware image storage capacity |
| Read Access Time | 70 ns - determines maximum bus clock rate for zero-wait-state CPU reads |
| Byte Programming Time | 10 µs typical - enables fast field updates of small configuration or calibration data |
| Erase Cycle Time | 10 seconds max - defines minimum downtime during firmware reflash operations |
| Operating Voltage | 5 V ±10% - eliminates need for charge pumps or dual-supply circuitry |
| Temperature Range | −40°C to +85°C - qualified for industrial-grade embedded control and instrumentation |
| Endurance | 10,000 write/erase cycles - supports long-term field-upgradable product lifecycle |
| Standby Current | 100 µA CMOS - enables ultra-low-power retention in battery-backed systems |
Pinout & Package
AT49F002-70JI is supplied in a 32-lead Plastic J-leaded Chip Carrier (PLCC) package with 1.27 mm pitch, JEDEC MS-016 AE compliant, and lead-free compatible. Pin 1 is marked by index notch; pin 1 function is RESET (active-low, TTL-compatible, supports 12 V override for boot-block unlock).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A17 used in command sequences |
| I/O0–I/O7 | Data Bus | Bi-directional 8-bit data path; I/O7 used for DATA polling, I/O6 for toggle-bit status monitoring |
| CE | Chip Enable | Active-low chip select; falling edge latches address during command entry and write cycles |
| OE | Output Enable | Active-low output control; must be high during programming/erase to prevent bus contention |
| WE | Write Enable | Active-low write strobe; rising edge latches data during command and programming sequences |
| RESET | Reset Input | Active-low reset; 12 V on this pin overrides boot-block lockout; not available on N(T) variants |
| VCC / GND | Power Supply | Single 5 V supply; decoupling required within 1 cm due to 50 mA active current |
| DC | No Connect | Pin 1 on DIP/PLCC and pin 9 on TSOP are unconnected; must be left floating or tied to ground per layout |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture | Independent erasability of boot, parameter, and main memory blocks enables modular firmware updates without full chip erase |
| Boot Block Lockout | Hardware-enforced write protection of 16K-byte boot sector prevents accidental corruption of bootloader code |
| DATA Polling | I/O7 returns complemented data during programming, enabling real-time host-side cycle completion detection without timers |
| Toggle Bit Detection | I/O6 toggles during erase/program; allows asynchronous status polling without dedicated control lines |
| 5V-Only Command Interface | Eliminates need for 12 V programming voltage-reduces BOM count and simplifies power design |
| Hardware Data Protection | VCC sense, noise filtering, and control-line interlock prevent spurious writes during power transients or EMI events |
Applications
| Industrial PLC Firmware Storage | Automotive ECUs with Bootloader Security |
|---|---|
Use Scenario: Storing firmware images and calibration tables in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile parallel Flash memory providing direct-mapped instruction/code execution space for ARM Cortex-M or 8051-based controllers. Use Value: 70 ns read access enables zero-wait-state operation at 10 MHz bus speeds; industrial temperature rating ensures reliability in uncontrolled cabinet environments. | Use Scenario: Hosting secure bootloader and application firmware in engine control units where over-the-air updates require verified integrity. IC Role / Device Role / Timing Role: Boot-block protected Flash memory isolating immutable bootloader code from field-updatable application partitions. Use Value: Hardware lockout prevents unauthorized modification of boot code; 12 V RESET override allows authorized reprogramming during service mode. |
| Medical Instrument Configuration Memory | Networking Equipment Boot Image Storage |
Use Scenario: Retaining device-specific calibration coefficients, user preferences, and safety-critical configuration parameters in portable diagnostic devices. IC Role / Device Role / Timing Role: Parameter-block Flash memory storing infrequently modified but mission-critical data with guaranteed write endurance. Use Value: Two independent 8K-byte parameter blocks allow A/B configuration storage; 10,000-cycle endurance exceeds 10-year field life requirements. | Use Scenario: Holding primary and fallback boot images in managed switches and routers to support fail-safe firmware recovery. IC Role / Device Role / Timing Role: Dual-main-memory-block Flash enabling atomic firmware swaps: one block active while the other is erased and reprogrammed. Use Value: Sector-erase independence allows background update of inactive block; 10-second erase time minimizes system downtime during maintenance windows. |
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 | 3 V core with 5 V tolerant I/O; 70 ns access; 2 Mbit; 32-pin TSOP | Requires level-shifting in pure 5 V systems; lacks RESET-based boot-block override | Select when migrating to lower-voltage platforms or when TSOP footprint is preferred over PLCC |
| SST39VF020-70-4C-NHE | 3.3 V only; 70 ns access; 2 Mbit; 32-pin PLCC; no boot-block lockout | Not 5 V compatible; no hardware-protected boot sector; uses different command set | Select for cost-sensitive 3.3 V designs where boot security is handled externally or via software-only methods |
Compared with AM29LV002BT-70EC and SST39VF020-70-4C-NHE, the AT49F002-70JI uniquely delivers 5 V-only operation with hardware-enforced boot-block protection and 12 V RESET override-critical for industrial firmware integrity where voltage translation and external security logic must be minimized.
Availability
AT49F002-70JI is available at Aetrix Electronics and suitable for industrial control systems, automotive electronic control units, medical instrumentation, and networking equipment requiring stable component supply and long-term obsolescence management.
Supply support for AT49F002-70JI 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 ICs for embedded applications.
The AT49F002 series was designed as a drop-in EPROM replacement offering in-system reprogrammability for 5 V microcontroller systems needing reliable, sector-erasable nonvolatile storage with hardware-level boot protection.
FAQ
What is the memory organization of the AT49F002-70JI?
The AT49F002-70JI contains 2 Mbit (256K × 8) of Flash memory organized into five physical sectors: one 16K-byte boot block (00000H–03FFFH), two 8K-byte parameter blocks, and two main memory blocks (96K and 128K bytes). This structure enables selective erasure and programming, and the AT49F002-70JI's boot block supports hardware lockout to protect critical startup code.
Does the AT49F002-70JI require high-voltage programming?
No, the AT49F002-70JI operates with 5 V only for both read and programming functions. It does not require external 12 V or higher programming voltages. All command sequences-including byte programming, sector erase, and boot-block lockout-are executed using standard 5 V logic levels, making the AT49F002-70JI compatible with conventional microcontroller buses without additional voltage translation.
How is boot-block protection implemented in the AT49F002-70JI?
The AT49F002-70JI implements boot-block protection via a six-cycle command sequence that permanently enables lockout for the 16K-byte boot sector. Once enabled, programming and erasure of the boot block are inhibited at ≤5.5 V. However, the AT49F002-70JI's RESET pin accepts 12 V ±0.5 V to override this protection, allowing authorized reprogramming during service-this feature is absent in AT49F002N(T) variants.
What are the supported package types for the AT49F002-70JI?
The AT49F002-70JI is specifically packaged in a 32-lead Plastic J-leaded Chip Carrier (PLCC), identified by package code "32J". This surface-mount package features a 1.27 mm lead pitch and JEDEC MS-016 AE compliance. Other variants like AT49F002-70JC use PDIP, and AT49F002-70TC use TSOP-but the "JI" suffix denotes industrial-grade PLCC only.
Can the AT49F002-70JI be used in place of standard EPROMs?
Yes, the AT49F002-70JI is pin- and command-compatible with standard 27C256 EPROMs in read mode: CE, OE, and WE inputs behave identically, and output timing meets EPROM-equivalent specifications. During programming, the AT49F002-70JI replaces UV-erasure and high-voltage programming with software-controlled sector erase and 5 V-only byte programming-making it a true in-system upgrade path for legacy EPROM-based designs.
AT49F002-70JI 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49F002-70JI FAQ
1.How can I place an order for AT49F002-70JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002-70JI 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 AT49F002-70JI reliable?
The price and inventory of AT49F002-70JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002-70JI is usually 5 days.
3.What payment methods are accepted for AT49F002-70JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002-70JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002-70JI?
AT49F002-70JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002-70JI 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 AT49F002-70JI?
For technical support, including AT49F002-70JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002-70JI requirements.
6.How does Aetrix verify that AT49F002-70JI is sourced from the original manufacturer or authorized distributors?
All AT49F002-70JI 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 AT49F002-70JI meets industry standards.
7.What is the process for return or replacement of AT49F002-70JI?
All AT49F002-70JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002-70JI, 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 AT49F002-70JI part is unused and in its original packaging.
Return procedure for AT49F002-70JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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