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Microchip Technology AT49F002NT-90JI
- Part No.:
- AT49F002NT-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002NT-90JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,839
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Product details
Overview
AT49F002NT-90JI from Atmel is a 5V-only, 2 Mbit (256K × 8) in-system reprogrammable Flash memory IC with 90 ns read access time, 10 µs typical byte programming time, and sector-based architecture including a 16K-byte boot block with programmable lockout. It operates across industrial temperature range (−40°C to +85°C) and supports hardware data protection, DATA polling, and toggle-bit erase/program status detection for embedded firmware storage applications.
For engineers reviewing the AT49F002NT-90JI datasheet, AT49F002NT-90JI pinout, AT49F002NT-90JI application, or AT49F002NT-90JI equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in boot code storage and parameter retention, and validated alternative parts with documented functional and architectural differences.
Technical Context
The AT49F002NT-90JI implements a command-register-based Flash architecture requiring six-byte software sequences for chip/sector erase and boot lockout enable. Its memory map is partitioned into one 16K-byte boot block (address 3C000H–3FFFFH), two 8K-byte parameter blocks, and two main memory blocks (96K and 128K bytes), enabling selective erasure without full-chip reset.
It uses standard EPROM-compatible control signals (CE/OE/WE) with TTL/CMOS-level inputs, internal program timing, and dual status detection methods-DATA polling on I/O7 and toggle-bit monitoring on I/O6-eliminating need for external wait-state logic during programming or erase cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Capacity | 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 | 90 ns max - ensures compatibility with 11 MHz bus timing in legacy 8051 and Z80-based systems. |
| Byte Programming Time | 10 µs typical - enables fast field updates of configuration parameters without system downtime. |
| Erase Cycle Time | 10 seconds max for full chip - supports in-system firmware recovery without socketing or external programmers. |
| Operating Voltage | 5 V ±10% - eliminates need for auxiliary voltage rails; compatible with standard 5V logic families. |
| Temperature Range | −40°C to +85°C - qualified for industrial control, automotive body electronics, and telecom infrastructure. |
| Standby Current | 100 µA CMOS - enables low-power operation in battery-backed or energy-sensitive embedded nodes. |
Pinout & Package
AT49F002NT-90JI is supplied in a 32-lead Plastic J-leaded Chip Carrier (PLCC) package (JEDEC MS-016 AE), with pin 1 marked by index notch and seating plane defined per specification. All pins are electrically active except pin 1 (RESET), which is a DC (don't connect) pin for this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A17 required for accessing upper memory blocks beyond 128K. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; controls device selection on shared data bus. |
| OE | Output Enable | Active-low output gate; used with CE to prevent bus contention during multi-device reads; high-Z when inactive. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges per command sequence; inhibits programming if held high. |
| I/O0–I/O7 | Bidirectional Data Bus | 8-bit parallel interface; carries data during read, program, and identification modes; supports true bidirectional flow without direction control pin. |
| VCC / GND | Power Supply | Single 5V supply with dedicated ground; decoupling required within 1 cm of pins to maintain 90 ns timing integrity. |
| RESET | DC Pin | No connection (NC); not functional on AT49F002NT variants - differs from AT49F002T where RESET enables boot override at 12V. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture | Enables independent erasure of 8K-byte parameter blocks and 96K/128K main memory blocks - allows runtime update of non-boot firmware while preserving secure boot code. |
| Boot Block Lockout | 16K-byte region (3C000H–3FFFFH) permanently protected after command sequence - prevents accidental overwrite of bootloader in production systems. |
| Hardware Data Protection | VCC sense (<3.8V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line interlock (OE low/CE high/WE high blocks writes) - eliminates spurious reprogramming in noisy environments. |
| DATA Polling & Toggle Bit | I/O7 complement feedback and I/O6 toggling provide real-time, bus-compatible program/erase completion signaling - removes dependency on fixed delay timers in host firmware. |
| 5V-Only Operation | Eliminates need for 12V programming voltage or charge pumps - simplifies power design and reduces BOM count in cost-sensitive industrial controllers. |
Applications
| Embedded Boot Code Storage | Firmware Parameter Retention |
|---|---|
Use Scenario: Storing immutable bootloader code in industrial PLCs that must survive power loss and field firmware updates. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped at reset vector; accessed during cold start before RAM initialization. Use Value: Boot block lockout ensures bootloader integrity across 10,000+ program cycles; 90 ns access meets tight timing budgets of 8-bit MCUs. | Use Scenario: Holding calibration data, device IDs, and user preferences in medical diagnostic equipment requiring long-term data retention. IC Role / Device Role / Timing Role: Parameter block storage updated infrequently via host MCU; erased/reprogrammed only during service mode. Use Value: Two independent 8K-byte parameter blocks allow A/B versioning and atomic updates without risking corruption of active settings. |
| Legacy System Firmware Upgrade | Telecom Line Card Configuration |
Use Scenario: Field-upgrading firmware in deployed base station controllers using in-system programming over RS-232 or CAN. IC Role / Device Role / Timing Role: Main memory block (96K/128K) hosting application firmware; erased and reloaded via serial command interface. Use Value: 10-second chip erase enables full firmware replacement in under 15 seconds; DATA polling synchronizes host software without hardcoded delays. | Use Scenario: Storing protocol stack configurations and hardware-specific initialization tables in modular telecom line cards. IC Role / Device Role / Timing Role: Dual main memory blocks used alternately - one active while the other is being updated - ensuring zero-downtime configuration changes. Use Value: Sector-erase capability permits selective update of individual protocol modules without resetting entire card or losing live traffic state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT49F002N-90JI | Same 2 Mbit capacity, 90 ns speed, and PLCC package; boot block located at 00000H–03FFFH (lower address space) instead of 3C000H–3FFFFH. | Requires different memory map layout in host firmware; no RESET pin functionality (same DC behavior). | Select when legacy designs require lower-address boot region and identical industrial temp rating. |
| SST39VF020-90-4C-NHE | 2 Mbit, 90 ns, 3.3V core (with 5V I/O tolerance); lacks boot block lockout but offers faster 18 µs byte programming and 20-year data retention. | Not 5V-only; requires level-shifting or mixed-voltage design; no hardware-protected boot region. | Select for lower power or longer data retention where boot security is managed in software or external logic. |
Compared with AT49F002N-90JI, the AT49F002NT-90JI provides upper-address boot block placement for flexible memory partitioning, while SST39VF020-90-4C-NHE trades 5V simplicity for 3.3V efficiency and higher endurance - making AT49F002NT-90JI optimal for cost-sensitive, 5V-only industrial upgrades requiring hardware-enforced boot integrity.
Availability
AT49F002NT-90JI is available at Aetrix Electronics and suitable for industrial control systems, telecom infrastructure equipment, and medical device firmware storage requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature operation.
Supply support for AT49F002NT-90JI 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 embedded applications.
The AT49F002(N)(T) product line was designed for in-system reprogrammable firmware and configuration storage in resource-constrained 8-bit and 16-bit systems, emphasizing 5V compatibility, sector-level flexibility, and hardware data protection.
FAQ
What is the boot block address range for AT49F002NT-90JI?
The AT49F002NT-90JI boot block occupies addresses 3C000H to 3FFFFH (16K bytes). This upper-address placement distinguishes it from the AT49F002N variant (00000H–03FFFH) and enables separation of boot code from application firmware in memory-mapped systems. The AT49F002NT-90JI datasheet confirms this mapping in the block diagram and command definitions section.
Does AT49F002NT-90JI support hardware reset functionality?
No, AT49F002NT-90JI does not support hardware reset functionality. Pin 1 is designated as "DC" (don't connect) per the ordering information and pin configuration diagrams. Unlike the AT49F002T variant, AT49F002NT-90JI omits RESET pin functionality entirely - a key distinction confirmed in the "RESET" subsection of the Device Operation chapter.
How many program/erase cycles is AT49F002NT-90JI rated for?
AT49F002NT-90JI is rated for a typical 10,000 program/erase cycles per memory location. This endurance figure is explicitly stated in the Features section and supported by the AC characteristics table, which defines tEC (erase cycle time) and tBP (byte programming time) under repeated stress conditions across the industrial temperature range.
Can AT49F002NT-90JI be programmed using standard 5V logic levels only?
Yes, AT49F002NT-90JI is a 5V-only Flash memory: all programming, erasing, and reading operations execute using standard 5V TTL/CMOS logic levels - no 12V or auxiliary voltages required. This is confirmed in the Features header ("Single-voltage Operation – 5V Read / 5V Reprogramming") and reinforced by the DC Characteristics table specifying VIH = 2.0V and VIL = 0.8V.
What packaging options are available for AT49F002NT-90JI?
AT49F002NT-90JI is exclusively offered in the 32-lead Plastic J-leaded Chip Carrier (PLCC) package (JEDEC MS-016 AE, suffix "J"). The ordering information table confirms "32J" as the only package code associated with AT49F002NT-90JI - unlike other variants that list PDIP, TSOP, or VSOP options.
AT49F002NT-90JI 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:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49F002NT-90JI FAQ
1.How can I place an order for AT49F002NT-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002NT-90JI 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-90JI reliable?
The price and inventory of AT49F002NT-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002NT-90JI is usually 5 days.
3.What payment methods are accepted for AT49F002NT-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002NT-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002NT-90JI?
AT49F002NT-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002NT-90JI 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-90JI?
For technical support, including AT49F002NT-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002NT-90JI requirements.
6.How does Aetrix verify that AT49F002NT-90JI is sourced from the original manufacturer or authorized distributors?
All AT49F002NT-90JI 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-90JI meets industry standards.
7.What is the process for return or replacement of AT49F002NT-90JI?
All AT49F002NT-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002NT-90JI, 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-90JI part is unused and in its original packaging.
Return procedure for AT49F002NT-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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