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Microchip Technology AT49F002NT-90JC
- Part No.:
- AT49F002NT-90JC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002NT-90JC.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,332
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Product details
Overview
AT49F002NT-90JC from Atmel is a 5V-only, 2 Mbit (256K × 8) in-system reprogrammable Flash memory IC with 90 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 serves as nonvolatile program/data storage in embedded controllers, BIOS firmware modules, and industrial HMI systems requiring field-upgradable code.
For engineers reviewing the AT49F002NT-90JC datasheet, AT49F002NT-90JC pinout, AT49F002NT-90JC application, or AT49F002NT-90JC equivalent, key selection considerations include boot block lockout behavior, 5V-only command interface, TSOP/PLCC package compatibility, sector erase granularity, and DATA polling/Toggle Bit end-of-program detection.
Technical Context
The AT49F002NT-90JC implements a standard parallel Flash architecture with CE/OE/WE control logic, supporting EPROM-like read timing and software-commanded erase/program operations. Its internal state machine executes chip or sector erase via six-cycle command sequences and byte programming via four-cycle sequences, all without external high-voltage inputs.
It features dual-mode boot block protection: permanent lockout when enabled (with 12V RESET override), and address-mapped sector layout where boot block resides at 3C000H–3FFFFH. The device uses DATA polling on I/O7 and Toggle Bit on I/O6 for operation completion detection, and integrates VCC sense, noise filtering, and control-line inhibit for hardware write protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - supports full firmware image storage for 8-bit microcontrollers. |
| Read Access Time | 90 ns max - enables direct execution from flash (XIP) in systems with ≤11 MHz bus clocks. |
| Byte Programming Time | 10 µs typical (50 µs max) - allows rapid field updates of configuration parameters or calibration data. |
| Erase Cycle Time | 10 seconds max for full chip - deterministic timing simplifies host firmware timeout handling. |
| End-of-Operation Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - eliminates need for fixed delays in driver code. |
| Write Endurance | 10,000 program/erase cycles - sufficient for infrequent firmware upgrades over 10+ year product lifecycles. |
| Power Dissipation | 50 mA active current / 100 µA CMOS standby - suitable for low-power industrial controllers with sleep modes. |
Pinout & Package
AT49F002NT-90JC is supplied in a 32-lead Plastic J-leaded Chip Carrier (PLCC) package, compatible with standard PLCC-32 sockets and reflow profiles. 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; A16/A17 used for sector selection 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 indication. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; latches address on falling edge during commands. |
| OE | Output Enable | Active-low output control; enables data bus drivers during read; high during programming to prevent bus contention. |
| WE | Write Enable | Active-low write strobe; latches data on rising edge during programming; used with CE to initiate command sequences. |
| RESET | Reset Input | Active-low reset; forces outputs to high-Z; 12V input overrides boot block lockout - not available on N(T) variants but present on NT. |
| VCC / GND | Power Supply | 5.0V ±10% supply; decoupling required within 10 mm of pins due to fast 90 ns switching transients. |
| DC | No Connect | Pin 9 is unconnected - must be left floating or tied to ground per board layout guidelines; no internal connection. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture | Independent 16K-byte boot block (3C000H–3FFFFH), two 8K-byte parameter blocks, and two main memory blocks enable selective firmware updates without erasing critical boot code. |
| Boot Block Lockout | Software-enabled permanent write protection for boot sector; prevents accidental corruption of startup code during field firmware upgrades. |
| 5V-Only Command Interface | Eliminates need for 12V programming voltage - simplifies power design and enables in-system reprogramming using standard 5V logic levels. |
| Hardware Data Protection | VCC sense (<3.8V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibit (OE low/CE high/WE high blocks writes) prevent spurious writes. |
| DATA Polling & Toggle Bit | Dual asynchronous status reporting methods allow real-time monitoring of program/erase completion without fixed delays or external timers. |
Applications
| Industrial PLC Firmware Storage | Embedded BIOS Module |
|---|---|
Use Scenario: Storing ladder logic programs and I/O configuration tables in programmable logic controllers with remote update capability. IC Role / Device Role / Timing Role: Nonvolatile program memory holding executable firmware; accessed via 8-bit parallel bus with 90 ns read timing synchronized to controller clock. Use Value: Sector erase allows updating logic programs without erasing retained I/O mapping data stored in parameter blocks. | Use Scenario: Holding POST routines, hardware initialization code, and boot menu logic in x86-compatible embedded motherboards. IC Role / Device Role / Timing Role: Boot ROM replacement providing XIP-capable firmware storage; mapped to CPU's 0xFFFF0 reset vector address space. Use Value: Boot block lockout ensures secure boot code integrity while permitting updates to BIOS setup menus and device drivers in main memory blocks. |
| Medical Device Calibration Storage | Automotive ECU Configuration Memory |
Use Scenario: Retaining sensor calibration coefficients and safety-critical operational limits in portable diagnostic equipment. IC Role / Device Role / Timing Role: Parameter memory storing factory-trimmed values; accessed during power-on self-test via byte reads with guaranteed 90 ns latency. Use Value: Two independent 8K-byte parameter blocks allow A/B versioning - one active set, one backup - enabling safe field recalibration. | Use Scenario: Storing vehicle-specific tuning maps, emission control parameters, and diagnostic trouble code history in engine control units. IC Role / Device Role / Timing Role: Field-updatable configuration memory interfaced to MCU via parallel bus; erased/reprogrammed during dealer reflash procedures. Use Value: 10,000-cycle endurance and hardware write protection ensure reliable parameter retention across 15-year vehicle service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV002BT-90EC | 48-pin TSOP, 3.3V core with 5V I/O tolerance; 90 ns read; boot block at top address; no RESET pin override. | Requires level-shifting for pure 5V systems; lacks 12V boot override; different pinout prevents drop-in replacement. | Select if migrating to lower-power 3.3V design with compatible bus interface and no need for hardware boot unlock. |
| SST39VF020-90-4C-NHE | 32-pin PLCC, 3.3V supply, 90 ns read, 16K boot sector at top; no RESET pin; Toggle Bit only (no DATA polling). | Not 5V-compatible; requires separate 3.3V rail; missing hardware boot override and dual status reporting. | Choose for cost-sensitive 3.3V systems where boot protection is managed in software and single-status detection suffices. |
Compared with AM29LV002BT-90EC and SST39VF020-90-4C-NHE, the AT49F002NT-90JC uniquely combines 5V-only operation, PLCC-32 footprint, RESET-pin-based boot override, and dual (DATA polling + Toggle Bit) status signaling - making it optimal for legacy 5V industrial designs requiring robust, field-serviceable firmware storage.
Availability
AT49F002NT-90JC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, embedded BIOS modules, medical calibration data retention, automotive ECU configuration, and HMI application code loading requiring stable component supply and long-term obsolescence support.
Supply support for AT49F002NT-90JC 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(N)(T) family was designed as cost-effective, 5V-only parallel Flash memory for embedded systems requiring in-field firmware upgradability, robust data retention, and simple integration into legacy 8-bit bus architectures.
FAQ
What is the boot block address range for AT49F002NT-90JC?
The boot block for AT49F002NT-90JC occupies addresses 3C000H to 3FFFFH (16K bytes). This top-sector location is specific to the AT49F002(N)T variant, confirmed in the datasheet's memory map and boot lockout detection section. The AT49F002NT-90JC uses this same layout, distinguishing it from the base AT49F002(N) which places the boot block at 00000H–03FFFH.
Does AT49F002NT-90JC support 12V RESET override for boot block programming?
Yes, AT49F002NT-90JC supports 12V ±0.5V applied to the RESET pin to override enabled boot block lockout. This feature is explicitly documented for the AT49F002(N)T series and confirmed in the "BOOT BLOCK PROGRAMMING LOCKOUT OVERRIDE" section. The "NT" suffix indicates inclusion of the RESET pin functionality, unlike the "N(T)" variants where RESET is unavailable.
What package type is used for AT49F002NT-90JC?
AT49F002NT-90JC uses a 32-lead Plastic J-leaded Chip Carrier (PLCC) package, designated as "32J" in Atmel's ordering information. The "JC" suffix confirms commercial temperature range (0°C to 70°C) and PLCC packaging, consistent across all AT49F002(N)(T) variants with that suffix.
How does hardware data protection work on AT49F002NT-90JC?
AT49F002NT-90JC implements three hardware protections: (1) VCC sense disables programming if supply drops below ~3.8V; (2) Program inhibit requires simultaneous CE low, OE high, and WE low - any deviation blocks writes; (3) Noise filtering rejects input pulses shorter than 15 ns on CE or WE. These features collectively prevent unintended writes during power transients or signal noise.
Can AT49F002NT-90JC be used in place of AT49F002N-90JC?
No, AT49F002NT-90JC is not a direct replacement for AT49F002N-90JC. While both share PLCC-32 packaging and 90 ns speed grade, the "NT" variant includes the functional RESET pin with 12V override capability and boot block at 3C000H–3FFFFH, whereas the "N" variant lacks RESET and locates boot block at 00000H–03FFFH. Firmware and hardware design must account for these differences.
AT49F002NT-90JC 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:
- 90 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)
AT49F002NT-90JC FAQ
1.How can I place an order for AT49F002NT-90JC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002NT-90JC 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-90JC reliable?
The price and inventory of AT49F002NT-90JC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002NT-90JC is usually 5 days.
3.What payment methods are accepted for AT49F002NT-90JC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002NT-90JC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002NT-90JC?
AT49F002NT-90JC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002NT-90JC 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-90JC?
For technical support, including AT49F002NT-90JC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002NT-90JC requirements.
6.How does Aetrix verify that AT49F002NT-90JC is sourced from the original manufacturer or authorized distributors?
All AT49F002NT-90JC 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-90JC meets industry standards.
7.What is the process for return or replacement of AT49F002NT-90JC?
All AT49F002NT-90JC units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002NT-90JC, 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-90JC part is unused and in its original packaging.
Return procedure for AT49F002NT-90JC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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