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Microchip Technology AT49F002NT-70JI
- Part No.:
- AT49F002NT-70JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002NT-70JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,779
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Product details
Overview
AT49F002NT-70JI from Atmel is a 5V-only, 2 Mbit (256K × 8) in-system reprogrammable Flash memory IC used for nonvolatile code and data storage in embedded controllers and boot loaders. It delivers 70 ns read access time, supports sector-based erase (10 s max), enables byte-by-byte programming (10 µs/byte typical), and features hardware data protection with 10,000 write/erase cycles endurance.
For engineers reviewing the AT49F002NT-70JI datasheet, AT49F002NT-70JI pinout, AT49F002NT-70JI application, or AT49F002NT-70JI equivalent, key selection considerations include its industrial temperature range (−40°C to +85°C), boot block lockout capability (3C000–3FFFFH), RESET-pin override for protected sector reprogramming, and compatibility with standard microprocessor bus timing.
Technical Context
The AT49F002NT-70JI implements a command-register-based architecture requiring six-byte sequences for chip/sector erase and boot lockout enable. Its internal program control logic manages erase timing autonomously, eliminating external clocks. The device uses DATA polling (I/O7 complement) and toggle-bit (I/O6) methods for cycle completion detection.
Memory organization includes one 16K-byte boot block (3C000–3FFFFH), two 8K-byte parameter blocks (3A000–3BFFFH, 38000–39FFFH), and two main memory blocks (20000–37FFFH and 00000–1FFFFH). Hardware protection includes VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and CE/OE/WE state-dependent inhibit logic.
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 | 70 ns max - meets timing requirements for 14 MHz Z80 or 8051-based systems |
| Byte Programming Time | 10 µs typical - allows rapid field updates without system interruption |
| Erase Cycle Time | 10 seconds max - supports efficient in-system reconfiguration of parameter sectors |
| Endurance | 10,000 write/erase cycles - validated for long-term use in industrial logging and configuration storage |
| Operating Voltage | 5 V ±10% - compatible with legacy 5V logic families and eliminates need for voltage translators |
| Temperature Range | −40°C to +85°C - qualified for industrial control, automotive body electronics, and outdoor equipment |
Pinout & Package
AT49F002NT-70JI is supplied in a 32-lead PLCC (32J) package with 1.27 mm pitch, 18.5 × 18.5 mm footprint, and J-leaded construction suitable for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A17 selects upper/lower 128K region |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface compatible with 8080/Z80-style microprocessor buses |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access |
| OE | Output Enable | Active-low output gate; controls data bus tristate to prevent bus contention during shared-memory operation |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence timing |
| RESET | Reset Control | Logic-high = normal operation; 12 V pulse enables boot block override - critical for secure bootloader recovery |
| GND / VCC | Power Supply | Single 5 V supply; CMOS standby current ≤300 µA ensures low-power sleep mode viability |
| DC | No Connect | Pin 1 in DIP/PLCC and Pin 9 in TSOP are unconnected - must be left floating per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture | Dedicated 16K boot block (3C000–3FFFFH) with lockout prevents accidental overwrite of startup code |
| Hardware Data Protection | VCC sense, noise filtering, and control-line inhibit prevent spurious writes during power transients or EMI events |
| Boot Block Lockout Override | 12 V applied to RESET pin unlocks protected boot sector - enables emergency firmware recovery without device replacement |
| DATA Polling & Toggle Bit | Real-time program/erase status via I/O7 complement or I/O6 toggling - eliminates need for fixed delay timers in host firmware |
| Industrial Temperature Rating | −40°C to +85°C operation validated across full voltage and timing specs - suitable for uncontrolled ambient deployments |
Applications
| Industrial PLC Firmware Storage | Automotive Body Control Module |
|---|---|
Use Scenario: Storing ladder logic firmware and configuration parameters in programmable logic controllers deployed in factory environments with wide thermal swings. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding initialization code and runtime configuration; 70 ns access supports deterministic scan-cycle timing. Use Value: Boot block lockout ensures core control logic remains intact during field updates to I/O mapping tables stored in parameter blocks. | Use Scenario: Holding door module firmware and calibration data in vehicles operating across −40°C winter starts to +85°C under-hood conditions. IC Role / Device Role / Timing Role: Primary flash storage for microcontroller boot code and EEPROM-emulated parameter storage; RESET-pin override enables dealer-level bootloader recovery. Use Value: 10,000-cycle endurance and industrial temp rating guarantee 15+ year service life without data corruption in safety-critical subsystems. |
| Medical Diagnostic Equipment | Network Router Boot Loader |
Use Scenario: Storing FDA-certified diagnostic algorithms and user-interface assets in portable ultrasound devices requiring regulatory-compliant firmware integrity. IC Role / Device Role / Timing Role: Secure boot memory with hardware-protected boot sector; sector erase isolates UI updates from core diagnostics engine. Use Value: Boot block lockout prevents unauthorized modification of certified code, satisfying IEC 62304 traceability requirements. | Use Scenario: Hosting U-Boot or similar open-source bootloaders in enterprise-grade routers where field-upgradable firmware is mandatory. IC Role / Device Role / Timing Role: In-system reprogrammable flash providing dual-image support (active/backup) via main memory block partitioning. Use Value: Sector erase capability enables atomic firmware swaps without downtime - critical for carrier-grade 99.999% uptime SLAs. |
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 | 48-pin TSOP, 3.0–3.6 V operation, no RESET-pin override, 55 ns read | Requires level-shifting for 5V systems; lacks boot block unlock mechanism | Select when migrating to 3.3 V platforms and boot security is managed externally |
| SST39VF020-70-4C-NHE | 32-pin TSOP, 3.0–3.6 V, 70 ns read, no hardware RESET override, 100K endurance | Higher endurance but incompatible voltage domain; no dedicated boot lockout override path | Prefer for cost-sensitive 3.3 V designs where firmware update recovery is handled by host processor |
Compared with AM29LV002BT-70EC and SST39VF020-70-4C-NHE, the AT49F002NT-70JI uniquely supports 5 V-only operation with hardware-enforced boot sector protection and 12 V RESET override - essential for legacy industrial systems requiring zero-risk bootloader recovery.
Availability
AT49F002NT-70JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, automotive body control modules, and medical diagnostic equipment requiring stable component supply across extended lifecycle commitments.
Supply support for AT49F002NT-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.
The AT49F002(N)(T) product line was designed for in-system reprogrammable nonvolatile storage in 5 V embedded systems requiring robust boot code protection and field-upgrade capability.
FAQ
What is the memory organization of the AT49F002NT-70JI?
The AT49F002NT-70JI organizes its 2 Mbit (256K × 8) array into one 16K-byte boot block (3C000–3FFFFH), two 8K-byte parameter blocks (3A000–3BFFFH and 38000–39FFFH), and two main memory blocks (20000–37FFFH and 00000–1FFFFH). This structure enables selective erasure and independent firmware/parameter updates while preserving boot integrity. The AT49F002NT-70JI's sector layout is fixed and cannot be reconfigured.
Does the AT49F002NT-70JI support 5 V-only programming without high-voltage generators?
Yes, the AT49F002NT-70JI supports true 5 V-only operation for both read and reprogramming - no external 12 V or 21 V programming voltage is required. All command sequences (byte program, sector erase, boot lockout) execute using standard 5 V logic levels. This eliminates need for charge pumps or external HV circuitry, simplifying board design and reducing BOM cost. The AT49F002NT-70JI achieves this via internal charge-pump-free algorithmic control.
How does the boot block lockout feature work on the AT49F002NT-70JI?
The AT49F002NT-70JI's boot block lockout is enabled via a six-byte command sequence (5555h/AAh → 2AAAh/55h → 5555h/40h). Once activated, the 16K-byte boot block (3C000–3FFFFH) becomes permanently write-protected at ≤5.5 V. Protection can only be lifted by applying 12.0 V ±0.5 V to the RESET pin - a hardware-level override that enables secure recovery. This dual-mode protection is unique to the AT49F002NT-70JI within its family.
What package type is used for the AT49F002NT-70JI?
The AT49F002NT-70JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC), designated as package code 32J. It measures 18.5 × 18.5 mm with 1.27 mm lead pitch and complies with JEDEC MS-016AE. Pin 1 is marked by a corner notch; DC (don't connect) is pin 1 - it must remain unconnected and floating. This package supports infrared reflow and offers superior thermal performance over PDIP for industrial applications.
Can the AT49F002NT-70JI be used in systems requiring extended temperature operation?
Yes, the AT49F002NT-70JI is rated for industrial temperature operation from −40°C to +85°C, with all AC/DC specifications guaranteed across this range. Its 70 ns read access time, 10 µs byte programming, and 10,000-cycle endurance are fully characterized at both extremes. The AT49F002NT-70JI's VCC standby current remains ≤300 µA at −40°C, ensuring reliable low-power retention in battery-backed systems deployed outdoors or in unconditioned enclosures.
AT49F002NT-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)
AT49F002NT-70JI FAQ
1.How can I place an order for AT49F002NT-70JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002NT-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 AT49F002NT-70JI reliable?
The price and inventory of AT49F002NT-70JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002NT-70JI is usually 5 days.
3.What payment methods are accepted for AT49F002NT-70JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002NT-70JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002NT-70JI?
AT49F002NT-70JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002NT-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 AT49F002NT-70JI?
For technical support, including AT49F002NT-70JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002NT-70JI requirements.
6.How does Aetrix verify that AT49F002NT-70JI is sourced from the original manufacturer or authorized distributors?
All AT49F002NT-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 AT49F002NT-70JI meets industry standards.
7.What is the process for return or replacement of AT49F002NT-70JI?
All AT49F002NT-70JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002NT-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 AT49F002NT-70JI part is unused and in its original packaging.
Return procedure for AT49F002NT-70JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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